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1 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 general description the AAT3696 batterymanager? is a single-cell lithium- ion (li-ion)/li-polymer battery charger ic designed to operate from usb ports or ac adapter up to an input voltage of 6.5v or 6.05v (depending on the option 1 ). for increased safety, the AAT3696 also includes over-voltage input protection (ovp) up to 28v. the AAT3696 precisely regulates battery voltage after it has reached 4.2v or 4.375v (depending on the option 1 ) li-ion/polymer battery cells through an extremely low r ds(on) switch. the charging current can be set by an external resistor up to 1.6a. in case an over-voltage condition occurs from the input, a series switch quickly opens and a fault flag is activated to prevent damage to the battery and charging circuitry. other fault conditions are monitored in real time. in case of an over-current, battery over-voltage, short circuit, or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the battery under charge. a status monitor- ing output pin (stat) is provided to indicate charging activity. this open-drain output pin can be used to drive an external led as a charging indicator. the AAT3696 has two charge termination mode selections when the battery voltage has reached the constant voltage level v co(reg) and the charging current has decreased the ter- mination current level. the AAT3696 offers a 4.9v/30ma ldo linear regulator. this regulator is enabled all the time regardless of the status of the charger and protected by the ovp switch. the AAT3696 is available in the pb-free, thermally enhanced, space-saving 3x3mm tdfn33-12 package and is rated over the -40c to +85c temperature range. features ? usb or ac adapter system power charger ? 3.0v ~ 6.5v or 6.05v input voltage range ? 2.8v typical under-voltage lockout threshold ? fast over-voltage protection turn off ? two ovp turn-on delay time options: ? 40 s ? 80ms ? two ovp trip point options: ? protection trip at 6.75v ? protection trip at 6.25v ? high level of integration with internal: ? power device ? reverse current blocking ? current sensing ? 4.9v/30ma ldo output through over-voltage protection device ? programmable current from 100ma to 1.6a max ? charge status indicator ? automatic recharge sequencing ? automatic trickle charge for battery pre-conditioning ? emergency thermal shutdown protection ? power on reset and soft start ? active low enable with internal 200k pull-down resistor ? two charge termination control selections: ? manual: continuous battery charging until charge termination by enable pin ? automatic: battery charging is terminated with transition to sleep state ? 12-pin 3x3mm tdfn package applications ? bluetooth? headsets, headphones, accessories ? digital still cameras ? mobile telephones ? mp3 players ? personal data assistants (pdas) 1. please refer to table 9 on page 19 for complete list of options.
2 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical application batt- vadp battery pack batt+ stat gnd bat ldoout r set iset in ovpflg ovpflg ldoout system inchr inchr bats 1f 10f 2.2f 10k 2.2f ic on/off en mode AAT3696 pin descriptions pin # name type function 1 inchr i/o output of over-voltage protection (ovp) stage and input to battery charger. decouple to gnd with 2.2 f capacitor. 2 in i input from usb port or ac adapter. 3 ldoout o 4.9v/30ma ldo output through ovp device. bypass to gnd with 2.2 f capacitor. 4 ovpflg o over-voltage fault ag, open drain, active low. 5 stat o charge status indicator pin, open drain, active low. 6 mode i mode selection pin (internal connect with a 200k pull-up resistor to inchr). factory default at 10% termination current if mode is open or connect to inchr. continues to charge if mode is connect to gnd. 7 gnd i/o power ground. 8 en i active low enable pin (internal connect with a 200k pull-down resistor). 9 iset i connect r set resistor here to set adaptor or usb charging current. 10 ic i internally connected through 100k resistor to gnd. leave this pin open. 11 bats i battery voltage remote sense input. 12 bat o connect to li-ion battery. ep exposed paddle (bottom); the exposed thermal pad (ep) should be connected to board ground plane and pin 7. the ground plane should include a large exposed copper pad under the package for thermal dissipation (see package outline). pin configuration tdfn33-12 (top view) inchr in ldoout 1 ovpflg stat mode bat bats ic iset en gnd 2 3 4 5 6 12 11 10 9 8 7
3 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 absolute maximum ratings 1 symbol description value units v in in continuous -0.3 to 30 v v p inchr, en, stat, ovpflg, mode -0.3 to 7.5 v v n bat, bats, ldoout, iset, ic -0.3 to v p + 0.3 v t j junction temperature range -40 to 150 c t a operating temperature range -40 to 85 c t lead maximum soldering temperature (at leads) 300 c thermal information 2 symbol description value units ? ja maximum thermal resistance (tdfn33-12) 50 c/w p d maximum power dissipation 2 w 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at co nditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. mounted on an fr4 board.
4 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 electrical characteristics 1 v in = 5v, t a = -40 to +85c, r set = 3.16k , v mode = 0v, bat = bats, unless otherwise noted. typical values are at t a = 25c symbol description conditions min typ max units operation v in_max input over-voltage protection range 28 v v in normal operating input voltage range 2, 3 refer to table 4 3.0 6.5 v refer to table 4 3.0 6.05 i op operating current r set = 15.8 k , v en = 0v, v in = 5v 0.5 0.6 ma i sd charge function shutdown supply current (ovp function still active) v in =v en = 5.5v 160 220 a i bat leakage current from bat pin v bat = 4v, in pin open 0 1 a over-voltage protection v ovpt over-voltage protection trip point 2, 3 v in rising edge; refer to table 4 6.5 6.75 7.0 v v in rising edge; refer to table 4 6.05 6.25 6.45 hysteresis 100 mv v do_ovp dropout voltage between in and inchr pins v in = 5v, i load@bat = 1000ma, r set = 1k 200 mv battery charger v uvlo under-voltage lockout threshold v in rising edge 2.5 2.8 3.0 v uvlo hysteresis 150 mv v do_charge dropout voltage between inchr and bat pins v in = 4.2v, i load@bat = 1000ma, r set = 1k 200 mv v bovp battery over-voltage protection threshold 4.4 v voltage regulation v co (reg) constant output voltage 2, 3 refer to table 4 4.20 v refer to table 4 4.375 ? v co /v co constant output voltage tolerance t a = 25c -0.5 +0.5 % t a = -40c to +85c -1 +1 % v rch battery recharge voltage threshold mode = high v co(reg) - 0.1 v v min preconditioning voltage threshold 2, 3 refer to table 4 2.4 2.6 2.8 v refer to table 4 2 2.2 2.4 current regulation i cc_range charge current programmable range 100 1600 ma i ch_cc constant-current mode charge current r set = 15.8k , v bat = 3.6v -15% 110 +15% ma r set = 3.16k , v bat = 3.6v -10% 500 +10% ma r set = 1.58k , v bat = 3.6v -10% 1000 +10% ma r set = 1k , v bat = 3.6v -15% 1500 +15% ma v iset iset pin voltage t a = 25c 1.98 2 2.02 v t a = -40c to +85c 1.9 2 2.1 ki iset charge current set factor: i ch_cc /i iset v bat = 3.6v 790 i ch_trk trickle charge current v bat = 2.3v 12 % i ch_cc i ch_term charge termination threshold current 10 % i ch_cc 1. the AAT3696 is guaranteed to meet performance specifications over the -40c to +85c operating temperature range and is assu red by design, characterization and correla- tion with statistical process controls. 2. only options -1, -2, -5, and -6 are available. 3. please refer to table 9 on page 19 for complete list of options.
5 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 electrical characteristics 1 v in = 5v, t a = -40 to +85c, r iset = 3.16k , v mode = 0v, bat = bats, unless otherwise noted. typical values are at t a = 25c symbol description conditions min typ max units logic control / battery protection v en(h) , v mode(h) input high threshold v in = 5v 1.2 v v en(l) , v mode(l) input low threshold 0.4 v v stat output low voltage stat pin sinks 4ma 0.4 v i stat stat pin current sink capability 8ma v ovpflg output low voltage ovpflg pin sinks 4ma 0.4 v i ovpflg ovpflg pin current sink capability 8ma t dly_ovpflg ovpflg assertion delay time from over- voltage from assertion of over-voltage condition (ov) 1 s t respov over-voltage protection response time v in voltage step up from 6v to 8v, r load = 100 , c inchr = 1 f 0.5 s t ovpr ovp switch turn-on rise time r load = 100 , c inchr = 1 f 100 s t shdn chip thermal shutdown temperature threshold 140 oc hysteresis 15 options -1, -3, -5, -7, -9, -11, -13, -15 t reldly_ovpflg_40 s ovpflg release delay time from release of over-voltage condition (ov) 1.5 s t ovpon_40 s ovp switch ovp release delay time v in voltage step down from 8v to 6v, r load = 100 , c inchr = 1 f 40 s t ovpstarton_40 s ovp switch start up delay time v in voltage step up from 0v to 5v, r load = 100 , c inchr = 1 f 150 250 s options -2, -4, -6, -8 , -10, -12, -14, -16 t reldly_ovpflg_80ms ovpflg release delay time from release of over-voltage condition (ov) 80 ms t ovpon_80ms ovp switch ovp release delay time v in voltage step down from 8v to 6v, r load = 100 , c inchr = 1 f 80 ms t ovpstarton_80ms ovp switch start up delay time v in voltage step up from 0v to 5v, r load = 100 , c inchr = 1 f 80 ms low dropout regulator (ldo) v out ldo output voltage tolerance i ldoout = 1ma to 30ma, v in = 5.1v t a = 25c 4.802 4.9 4.998 v t a = -40c to 85c 4.729 4.9 5.071 v in = 5v, i ldoout = 50ma 4.4 v do ldo dropout voltage i ldoout = 30ma, v in =4.9v 200 300 mv i lim ldo current limit v out = 0v 75 ma ? v out /v out * ? v in ldo line regulation v in = 5v to 6v or 5.4v to 6.4v, i ldoout = 10ma 0.09 %/v ? v out(line) ldo dynamic line regulation i ldoout = 30ma, v in = 5v to 6v or 5.4v to 6.4v, t r /t f = 2 s 25 mv ? v out(load) ldo dynamic load regulation i ldoout = 1ma to 30ma, t r <5 s; v in = v out(nom) +1v 60 mv 1. the AAT3696 is guaranteed to meet performance specifications over the -40c to +85c operating temperature range and is assu red by design, characterization and correla- tion with statistical process controls.
6 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical characteristics ? battery charger constant charging current vs. set resistor values r set (k ) constant charging current (ma) 1 10 100 1000 10000 110 0.1 100 operating current vs. set resistor values r set (k ) operating current (a) 110 0.1 100 0 300 600 900 1200 1500 1800 2100 2400 constant current mode preconditioning mode constant charging current vs. battery voltage battery voltage (v) constant charging current (ma) 2.7 2.9 2.5 3.1 3.3 3.5 3.7 3.9 4.1 4.3 0 200 400 600 800 1000 1200 r set = 1.58k r set = 1.96k r set = 2.67k r set = 3.92k r set = 7.87k constant charging current vs. temperature (r set = 1.58k) temperature (c) constant charging current (ma) -15 10 -40 35 60 85 990 994 998 1002 1006 1010 constant charging current vs. input voltage (r set =1.58k) input voltage (v) constant charging current (ma) 4.5 5.0 4.0 5.5 6.0 6.5 700 750 800 850 900 950 1000 1050 v bat = 3.3v v bat = 3.6v v bat = 3.9v v bat = 4.1v constant charging current vs. input voltage (r set = 3.16k) input voltage (v) constant charging current (ma) 4.5 5.0 4.0 5.5 6.0 6.5 400 420 440 460 480 500 520 540 560 580 v bat = 3.3v v bat = 3.6v v bat = 3.9v v bat = 4.1v
7 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical characteristics ? battery charger preconditioning voltage threshold vs. temperature (r set = 1.58k) temperature (c) preconditioning voltage threshold (v) -15 10 -40 35 60 85 2.55 2.56 2.57 2.58 2.59 2.60 2.61 2.62 2.63 preconditioning charge current vs. temperature (r set = 1.58k; i ch_cc = 1000ma) temperature (c) preconditioning charge current (ma) -15 10 -40 35 60 85 80 85 90 95 100 105 110 115 120 constant output voltage vs. temperature (r set = 1.58k) temperature (c) constant output voltage (v) -15 10 -40 35 60 85 4.180 4.185 4.190 4.195 4.200 4.205 4.210 4.215 4.220 constant output voltage vs. input voltage (r set =1.58k) input voltage (v) constant output voltage v) 5.3 5.6 5.0 5.9 6.2 6.5 4.190 4.192 4.194 4.196 4.198 4.200 4.202 4.204 4.206 4.208 4.210 enable input low voltage vs. input voltage input voltage (v) enable low voltage (v) 4.5 5.0 4.0 5.5 6.0 6.5 0.60 0.63 0.66 0.69 0.72 0.75 0.78 0.81 0.84 85c 25c -40c enable input high voltage vs. input voltage input voltage (v) enable high voltage (v) 4.5 5.0 4.0 5.5 6.0 6.5 0.890 0.891 0.892 0.893 0.894 0.895 0.896 0.897 0.898 0.899 0.900 85c 25c -40c
8 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical characteristics ? ovp ovpflg assertion delay time (r load = 100, ovp trip point 6.75v) time (1s/div) input voltage (top) (v) ovpflg voltage (bottom) (v) 0 1 2 3 4 5 6 7 8 ovpflg assertion delay time (r load = 100, ovp trip point 6.25v) time (1s/div) input voltage (top) (v) ovpflg voltage (bottom) (v) 0 1 2 3 4 5 6 7 8 ovpflg release delay time ( r load = 100, ovp trip point 6.75v) time (50s/div) input voltage (top) (v) ovpflg voltage (bottom) (v) 0 1 2 3 4 5 6 7 8 ovpflg release delay time ( r load = 100, ovp trip point 6.25v) time (50s/div) input voltage (top) (v) ovpflg voltage (bottom) (v) 0 1 2 3 4 5 6 7 8 ovp switch release delay time ( r load = 100, all 40s delay options) time (10s/div) input voltage (top) (v) inchr voltage (bottom) (v) 4 6 8 10 -2 0 2 4 6 ovp switch release delay time ( r load = 100, all 80ms delay options) time (50ms/div) input voltage (top) (v) inchr voltage (bottom) (v) 0 2 4 6 8 10 0 2 4 6 8 10 12
9 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical characteristics ? ovp over-voltage protection response time (r load = 100, all 80ms delay options) time (50ms/div) input voltage (top) (v) inchr voltage (bottom) (v) 0 2 4 6 8 10 0 2 4 6 8 over-voltage protection response time (r load = 100, all 40s delay options) time (10s/div) input voltage (top) (v) inchr voltage (bottom) (v) 0 2 4 6 8 10 0 2 4 6 8 ovp trip point vs. temperature temperature (c) ovp trip point (v) -15 10 -40 35 60 85 6.00 6.20 6.40 6.60 6.80 7.00 3696-1, -2 3696-5, -6 battery recharge voltage threshold vs. temperature (r set = 1.58k) temperature (c) battery recharge voltage threshold (v) -15 10 -40 35 60 85 4.070 4.075 4.080 4.085 4.090 4.095 4.100 4.105 4.110
10 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical characteristics ? ldo ldo output voltage accuracy vs. input voltage (i ldoout = 10ma) input voltage (v) output voltage accuracy (%) 5.3 5.5 5.1 5.7 5.9 6.1 6.3 6.5 -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 85c 25c -40c ldo output voltage accuracy vs. input voltage (i ldoout = 30ma) input voltage (v) output voltage accuracy (%) 5.3 5.5 5.1 5.7 5.9 6.1 6.3 6.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 85c 25c -40c ldo output voltage accuracy vs. temperature (i ldoout = 10ma) temperature (c) output voltage accuracy (%) -15 10 -40 35 60 85 -1.000 -0.800 -0.600 -0.400 -0.200 0.000 0.200 0.400 0.600 0.800 1.000 ldo output voltage accuracy vs. temperature (i ldoout = 30ma) temperature (c) output voltage accuracy (%) -15 10 -40 35 60 85 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 ldo output voltage vs. temperature (i ldoout = 10ma) temperature (c) output voltage (v) -15 10 -40 35 60 85 4.800 4.810 4.820 4.830 4.840 4.850 4.860 4.870 4.880 4.890 4.900 ldo output voltage accuracy vs. output current (v in = 5.1v; v ldoout = 4.9v) output current (ma) output voltage accuracy (%) 510 01520253035 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 85c 25c -40c
11 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 typical characteristics ? ldo ldo load transient ( v in = 5.4v; i ldoout = 1ma to 30ma; c out = 1f) time (100s/div) output current (top) (ma) output voltage (bottom) (mv) 0 20 40 60 -100 -50 0 50 100 ldo load transient ( v in = 5.4v; i ldoout = 10ma to 30ma; c ldoout = 1f) time (100s/div) output current (top) (ma) output voltage (bottom) (mv) 0 20 40 60 -100 -50 0 50 100 ldo line transient ( v in = 5.4v to 6.4v; i ldoout = 30ma; c ldoout = 1f) time (100s/div) input voltage (top) (v) output voltage (bottom) (v) 4 5 6 7 8 4.6 4.7 4.8 4.9 5 5.1 ldo dropout voltage vs. output current output current (ma) ldo dropout voltage (mv) 510 015202530 0 50 100 150 200 250 300 85c 25c -40c
12 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 functional description the AAT3696 is a high performance battery charger ic designed to charge single-cell lithium-ion or polymer batteries with up to 1.6a of current from external power source. it is a stand alone charging solution requiring minimum input components. also included a fast turn-off over-voltage protection (ovp) circuits with +28v and this ovp consist of a low resistance p-channel mosfet in series with the charge control mosfet. the AAT3696 also designed with of under-voltage lockout protection, over-voltage monitor, fast shut-down circuitry with a fault output flag, and a 4.9v ldo with 30ma output through the ovp switch. battery charging operation figure 1 illustrates the entire battery charging profile or operation, which consist of three phases: 1. preconditioning (trickle) charge 2. constant current charge 3. constant voltage charge 4. automatic recharge when mode = high preconditioning charge battery charging commences only after the AAT3696 checks several conditions in order to maintain a safe charging environment. the input supply must be above the minimum operating voltage, or under-voltage lock- out threshold (v uvlo ) and the enable pin must be low for the charging sequence to begin. when these conditions have been met and a battery is connected to the bat pin, the AAT3696 checks the state of the battery and determines which charging mode to apply. if the battery voltage is below the preconditioning voltage threshold (v min ), then the AAT3696 begins preconditioning the cell (trickle charging) by charging at 10% of the programmed constant current. for example, if the programmed fast charge current is 1600ma, then the preconditioning (trickle charge) current is 160ma. battery cell precondi- tioning is a safety precaution for deeply discharged cells and will also reduce the power dissipation in the internal series pass transistor when the voltage across the device is at greatest potential. functional block diagram charge control current compare reverse blocking constant current bat iset uvlo over-temp protect 4.9v/30ma ldo gnd ovp sense and control stat in en cv/ pre-charge ovpflg ldoout charge status inchr ovp switch bats mode ic
13 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 constant current charge battery cell preconditioning charge continues until the battery voltage reaches the preconditioning voltage threshold (v min ). at this point, the AAT3696 begins con- stant current charge. the current level for this mode is programmed using a single resistor from the iset pin to ground. the programmed current can be set at a mini- mum 100ma up to a maximum of 1.6a. constant voltage charge constant current charge will continue until the battery voltage reaches the constant output voltage threshold, v co (reg) . the AAT3696 will then transition to constant voltage mode, where the charge ic regulates the battery voltage at constant output voltage (factory programmed to 4.2v or 4.375v). the charging current at this phase will decrease until the charge termination current or 10% of the programmed constant current is reached. the AAT3696 has two charge termination control selec- tions which can be set by the mode pin. mode = 0 (ground or logic low) the charger regulates battery voltage at 4.2v or 4.375v optional voltage and continues to charge the battery with a current lower than the programmed charge ter- mination current until the AAT3696 is disabled by apply- ing logic high to the en pin to stop charging. mode = 1 (inchr or logic high) the charger turns off the series pass device and auto- matically goes into a power-saving sleep state. during this time, a series pass device blocks the current in both directions, preventing the battery from discharging through the ic. the AAT3696 will remain in sleep mode until the battery voltage drops below the v rch threshold or the charger is enabled or input power is recycled. the AAT3696 will resume charging operation if no fault is detected. i ch_trk i ch_cc v min battery voltage battery current charger turns on v rch i ch_term preconditioning charge constant current charge constant voltage charge charger turns off when mode = high v co(reg) battery recharge charger stays on when mode = low en figure 1: current vs. voltage profile during charging phases.
14 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 charger operational flowchart v ch >v bat v min >v bat i bat > i min no no charge completed charge completed yes adp voltage s adp > v adpp recharge test v bat < v rch preconditioning test v min > v bat current phase test v co(reg) > v bat voltage phase test i bat > i term no no charge completed charge completed yes yes power select power input voltage v in >v uvlo ? sleep mode sleep mode sleep power on reset shut down mode shut down mode shut down mode preconditioning (trickle charge) yes yes shut down mode shut down mode shut down mode constant current charge mode yes yes yes yes shut down mode shut down mode shut down mode constant voltage charge mode no no yes no ovp condition monitoring v in v ovp > shut down mode shut down mode shut down mode disconnect input from charger yes no en = high ? no no fault conditions monitoring? bov, ot charge suspended i bat > i min mode = 0 ? shut down mode shut down mode shut down mode continuously charging at constant voltage no yes y e s no
15 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 charge status output the AAT3696 provides battery charging status via a sta- tus pin, stat. this pin is internally connected to an n-channel open-drain mosfet, which can be used as a logic signal, or drive an external led. the charge status indication pin (stat) pulls high indicating charge com- pletion or charge termination, regardless of the selection of the charge termination mode, as long as the charge termination current is reached. the status pin indicates the following conditions described in table 1: charge status status battery is charging low charging is completed high when en is high high table 1: led status indicator. enable/disable the AAT3696 provides an enable function to control the charger ic on and off. the enable (en) pin is internally pulled down with 200k . when en is pulled down or left floating, normal device operation commences. when it is pulled to a logic high level, the AAT3696 charging circuit will be shut down and forced into sleep state but the over-voltage protection circuit remains in active state. charging will be halted regardless of the battery voltage or charging state. when the device is re-enabled, the charge control circuit will automatically reset and resume charging functions with the appropriate charging mode based on the battery charge state and measured cell voltage at the bat pin. low dropout regulator the AAT3696 includes a low dropout regulator with input range from 5v to the ovp trip point which is 6.75v or 6.25v and is always enabled. the ldo output v out is set to 4.9v and supplies a continuous current up to 30ma. the ldo output needs to be decoupled with 2.2 f to ground for stability reasons. over-voltage protection in normal operation, an ovp switch acts as a load switch, connecting the power source from in to inchr. this switch is designed with very low resistance to min- imize the voltage drop between the power source and the charger and to reduce the power dissipation. when the voltage on the power source exceeds the ovp trip point, 6.75v or 6.25v respectively, the switch immedi- ately becomes open (off) and disconnect the load and the charger from the power source therefore, preventing damage to any downstream components. simultaneously, the fault flag is raised, alerting the system. if an over- voltage condition is applied at the time of the device enable, the switch remains open (off). under-voltage lockout (uvlo) the AAT3696 has a 3v (maximum) under-voltage lock- out level (uvlo). when the input voltage is less than the uvlo level, the ovp switch and the charger are turned off. it is designed with 150mv hysteresis to ensure cir- cuit stability. over-voltage fault flag output the over-voltage fault flag (ovpflg) is an active-low open-drain fault reporting output. a pull-up resistor should be connected from to i/o voltage of the system. in the event of an over-voltage condition ovpflg will be asserted immediately with approximately 1 s inherited internal circuit delay. after the over-voltage fault is released, ovpflg will be de-asserted with 1.5 s delay (optional of 80ms delay). battery over-voltage protection an over-voltage event is defined as a condition where the voltage at the bat pin exceeds the maximum battery charge voltage and is set by the battery over-voltage protection threshold (v bovp ). if an overvoltage condition occurs sensed by the bats pin, the AAT3696 charge control will shut down the device until voltage at the bat pin drops below v bovp . the AAT3696 will resume normal charging operation after the over-voltage condition is removed. over-temperature shutdown the AAT3696 has a thermal protection control circuit which will shut down charging functions if the internal die temperature exceed the preset thermal limit thresh- old of 140c. once the internal die temperature falls below the thermal limit, normal operation will resume the previous charging state.
16 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 application information constant charge current the constant current charge level is user programmed with a set resistor connected between the iset pin and ground. the accuracy of the constant charge current, as well as the preconditioning trickle charge current, is dominated by the tolerance of the set resistor used. for this reason, a 1% tolerance metal film resistor is recom- mended for the set resistor function. the constant charge current levels from 100ma to 1.6a may be set by selecting the appropriate value from table 2. charge current setting formula: i ch_cc (typ) = ki iset v iset r set constant charge current (ma) set resistor value (k ) 110 15.8 200 7.87 400 3.92 500 3.16 600 2.67 800 1.96 1000 1.58 1500 1.00 table 2: r set values. figure 2 shows the relationship of constant charging cur- rent and set resistor values for the AAT3696. charging current vs. set resistor values r set (k ) charging current (ma) 1 10 100 1000 10000 110 0.1 100 figure 2: constant charging current vs. set resistor values. note: the iset pin is very sensitive and if a total capac- itive load of more than 20pf is connected, it may start oscillating. battery connection and battery voltage sensing battery connection (bat) a single cell li-ion/polymer battery should be connected between bat input and ground. battery voltage sensing (bats) the bats pin is provided to employ an accurate voltage sensing capability to measure the positive terminal volt- age at the battery cell being charged. this function reduces measured battery cell voltage error between the battery terminal and the charge control ic. the AAT3696 charge control circuit will base charging mode states upon the voltage sensed at the bats pin. the bats pin must be connected to the battery terminal for correct operation. if the battery voltage sense function is not needed, the bats pin should be terminated directly to the bat pin. if there is concern of the battery sense function inadvertently becoming an open circuit, the bats pin may be terminated to the bat pin using a 10k resistor. under normal operation, the connection to the battery terminal will be close to 0 ; if the bats connec- tion becomes an open circuit, the 10k resistor will pro- vide feedback to the bats pin from the bat connection with a voltage sensing accuracy loss of 1mv or less. status indicator display simple system charging status states can be displayed using one led in conjunction with the stat pin on the AAT3696. this pin has a simple switch connecting the led?s cathode to ground. refer to table 1 for led display definitions. the led anodes should be connected to v in , depending upon system design requirements. the led should be biased with as little current as necessary to create reasonable illumination; therefore, a ballast resis- tor should be placed between the led cathode and the stat pin. led current consumption will add to the over- all thermal power budget for the device package, so it is wise to keep the led drive current to a minimum. 2ma should be sufficient to drive most low cost green or red led. it is not recommended to exceed 8ma when driving an individual status led. the required ballast resistor value can be estimated using the following formulas: when connecting to the adapter supply with a red led: r b(stat) = v adp - v fled i led(stat)
17 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 example: r b(stat) = = 1.75k 5.5v - 2.0v 2ma red led forward voltage (v f ) is typically 2.0v @ 2ma. when connecting to the usb supply with a green led: r b(stat) = v usb - v fled i led(stat) example: r b(stat) = = 900 5.0v - 3.2v 2ma green led forward voltage (v f ) is typically 3.2v @ 2ma. ic input the AAT3696 has an ic input pin which is internally con- nected to ground through a 100k resistor. capacitor selection input capacitor a 1 f or larger capacitor is typically recommended for c in . c in should be located as close to the device in pin as practically possible. ceramic, tantalum, or aluminum electrolytic capacitors may be selected for c in . there is no specific capacitor equivalent series resistance (esr) requirement for c in . however, for higher current opera- tion, ceramic capacitors are recommended for c in due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices. typically, 50v rated capacitors are required for most of the application to prevent any surge voltage. ceramic capacitors selected as small as 1206 are available which can meet these requirements. other voltage rating capacitor can also be used for the known input voltage application. charger input capacitor a 2.2 f decoupling capacitor is recommended to be placed between inchr and gnd. charger output capacitor the AAT3696 only requires a 1 f ceramic capacitor on the bat pin to maintain circuit stability. this value should be increased to 10 f or more if the battery con- nection is made any distance from the charger output. if the AAT3696 is used in applications where the battery can be removed from the charger, such as desktop charging cradles, an output capacitor greater than 10 f may be required to prevent the device from cycling on and off when no battery is present. linear regulator output capacitor for proper load voltage regulation and operational sta- bility, a capacitor is required between ldoout and gnd. the output capacitor connection to the ldo regulator ground pin should be made as directly as practically pos- sible for maximum device performance. since the regu- lator has been designed to function with very low esr capacitors, ceramic capacitors in the 1.0 f to 10 f range are recommended or best performance. applications utilizing the exceptionally low output noise and optimum power supply ripple rejection of the AAT3696 should use 2.2 f or greater values for the ldo?s output capacitor. printed circuit board layout recommendations for proper thermal management and to take advantage of the low r ds(on) of the AAT3696, a few circuit board layout rules should be followed: in and bat should be routed using wider than normal traces, and gnd should be connected to a ground plane. to maximize package thermal dissipation and power handling capacity of the AAT3696 tdfn3x3 package, solder the exposed paddle of the ic onto the thermal landing of the pcb, where the thermal landing is connected to the ground plane. if heat is still an issue, multi-layer boards with dedicated ground planes are recommended. also, adding more thermal vias on the thermal landing would help the heat being transferred to the pcb effectively.
18 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 figure 3: AAT3696 evaluation board top layer. figure 4: AAT3696 evaluation board bottom layer. 1f c1 c2 2.2f c4 2.2f inchr en jp1 c3 10f 1 2 vin gnd 4v - 28v bat gnd 1 2 green led d2 red led d1 1k r2 1k r3 r1 1.6k mode jp2 ldo +5 en 8 gnd 7 stat 5 in 2 ic 10 bats 11 bat 12 ovpflg 4 iset 9 mode 6 inchr 1 ldoout 3 AAT3696 u1 figure 5: AAT3696 evaluation board schematic.
19 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 component part number description manufacturer u1 AAT3696iwp 1.6a linear li-ion/polymer battery charger in tdfn33-12 package skyworks r1 chip resistor 1.6k , 1%, 1/4w; 0603 vishay r2, r3 chip resistor 1k , 5%, 1/4w; 0603 vishay c1 grm31mr71h105ka88 ceramic 1 f 50v 10% x7r 1206 murata c2, c4 grm188r61a225ke34 ceramic 2.2 f 10v 10% x5r 0603 murata c3 grm21br71a106ke51l ceramic 10 f 10v 10% x7r 0805 murata jp1, jp2 prpn401paen conn. header, 2mm zip sullins electronics d1 ltst-c190ckt red led; 0603 lite-on inc. d2 ltst-c190gkt green led; 0603 lite-on inc. table 3: AAT3696 evaluation board bill of materials (bom). AAT3696 feature options product constant voltage regulation (v) ovp trip point (v) ovp turn on delay time ( s) preconditioning voltage threshold (v) AAT3696-1 4.2 6.75 40 2.6 AAT3696-2 4.2 6.75 80,000 2.6 AAT3696-3 4.375 6.75 40 2.6 AAT3696-4 4.375 6.75 80,000 2.6 AAT3696-5 4.2 6.25 40 2.6 AAT3696-6 4.2 6.25 80,000 2.6 AAT3696-7 4.375 6.25 40 2.6 AAT3696-8 4.375 6.25 80,000 2.6 AAT3696-9 4.2 6.75 40 2.2 AAT3696-10 4.2 6.75 80,000 2.2 AAT3696-11 4.375 6.75 40 2.2 AAT3696-12 4.375 6.75 80,000 2.2 AAT3696-13 4.2 6.25 40 2.2 AAT3696-14 4.2 6.25 80,000 2.2 AAT3696-15 4.375 6.25 40 2.2 AAT3696-16 4.375 6.25 80,000 2.2 table 4: AAT3696 options.
20 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 ordering information package marking 1 part number (tape and reel) 2, 3 tdfn33-12 6exyy AAT3696iwp-1-t1 tdfn33-12 6fxyy AAT3696iwp-2-t1 tdfn33-12 AAT3696iwp-3-t1 tdfn33-12 AAT3696iwp-4-t1 tdfn33-12 6gxyy AAT3696iwp-5-t1 tdfn33-12 6hxyy AAT3696iwp-6-t1 tdfn33-12 AAT3696iwp-7-t1 tdfn33-12 AAT3696iwp-8-t1 tdfn33-12 AAT3696iwp-9-t1 tdfn33-12 AAT3696iwp-10-t1 tdfn33-12 AAT3696iwp-11-t1 tdfn33-12 AAT3696iwp-12-t1 tdfn33-12 AAT3696iwp-13-t1 tdfn33-12 AAT3696iwp-14-t1 tdfn33-12 AAT3696iwp-15-t1 tdfn33-12 AAT3696iwp-16-t1 skyworks green? products are compliant with all applicable legislation and are halogen-free. for additional information, refer to skyworks de?ition of green , document number sq04-0074. 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . 3. for detailed description of all options, refer to table 4 on page 19.
21 AAT3696 data sheet 1.6a li-ion battery charger in a 3x3 tdfn package skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201897b ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 27, 2012 copyright ? 2012 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyworks solutions, inc. (?skyworks?) products or services. these m aterials, including the information contained herein, are provided by skyworks as a service to its customers and may be used for informational purposes only by the customer. skyworks assumes no responsibility fo r errors or omissions in these materials or the information contained herein. sky- works may change its documentation, products, services, speci cations or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or informati on and shall have no responsibility whatsoever for con icts, incompatibilities, or other dif culties arising from any future changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document . skyworks assumes no liability for any materials, products or information provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or materials, except as may be p rovided in skyworks terms and conditions of sale. the materials, products and information are provided ?as is? without warranty of any kind, whether express, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non-infringement of any intellectual property right; all such warranti es are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. sk yworks shall not be liable for any damages, in- cluding but not limited to any special, indirect, incidental, statutory, or consequential damages, including without limitation , lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or en- vironmental damage. skyworks customers using or selling skyworks products for use in such applications do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may deviate from published speci cations as a result of design defects, errors, or operation of products outside of pub- lished parameters or design speci cations. customers should include design and operating safeguards to minimize these and other risks. skyworks assumes no liabi lity for applications assistance, customer product design, or damage to any equipment resulting from the use of skyworks products outside of stated published speci cations or parameters. skyworks, the skyworks symbol, and ?breakthrough simplicity? are trademarks or registered trademarks of skyworks solutions, inc ., in the united states and other countries. third-party brands and names are for identi cation purposes only, and are the property of their respective owners. additional information, including relevant terms and co nditions, posted at www.skyworksinc.com, are incorporated by reference. package information tdfn33-12 1 top view bottom view detail "a" side view 3.00 all dimensions in millimeters. 1. the leadless package family, which includes qfn, tqfn, dfn, tdfn and stdfn, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. a solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder c onnection.

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