View AAT3192IJQ-4_2632481.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 3193.2007.05.1.0 1 chargepump ? general description the aat3192 and aat3193 are charge-pump based, current-sink white led drivers capable of driving one to three leds up to 30ma, each. they automatically switch between 1x mode and 2x mode to maintain the highest efficiency and opti- mal led current accuracy and matching. the aat3192/93 charge pumps 1x mode (bypass mode) has very low resistance allowing led cur- rent regulation to be maintained with input supply voltage approaching the led forward voltage. the aat3192 and the aat3193 are available in a 2x2mm 10-lead sc70jw-10 packages. features ? drives up to 3 leds at up to 30ma, each ? automatic switching between 1x and 2x modes ? 0.9mhz switching frequency ? linear led output current control single-wire, s 2 cwire interface ? aat3192/93-1: 16-step ? aat3192/93-2: 8-step ? aat3192/93-3: 4-step on/off or pwm interface ? aat3192/93-4 ? 10% led output current accuracy ? 3% led output current matching ? low-current shutdown mode ? built-in thermal protection ? automatic soft-start ? available in 2x2mm sc70jw-10 package applications ? low-cost cordless phone handsets ? low-cost digital cameras ? low-cost mobile phone handsets ? low-cost mp3 and pmp players typical application input voltage 2.7v to 5.5v in c+ c- en/set out d1 d2 rset r set 14.3k en/set s 2 cwire interface c in 1f c p 1f c out 1f gnd aat3192-1 wleds osram lw m 678 or equivalent input voltage 2.7v to 5.5v en/set s 2 cwire interface in c+ c- en/set out d1 d2 d3 rset r set 14.3k c out 1f gnd wleds osram lw m 678 or equivalent aat3193-1 c p 1f c in 1f
pin descriptions pin configuration aat3192 aat3193 sc70jw-10 sc70jw-10 (top view) (top view) aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 2 3193.2007.05.1.0 pin symbol description aat3192 aat3193 1 n/c d1 aat3192: no connection. aat3193: led1 current sink input. d1 is the input of led1 current sink. connect led1s anode to out and its cathode to d1. 2 out charge pump output. out is the output of the charge pump. bypass out to gnd with a 1f or larger ceramic capacitor. 3 c- charge pump capacitor negative node. 4 c+ charge pump capacitor positive node. connect a 1f ceramic capacitor between c+ and c-. 5 in power source input. connect in to the power source, typically the battery. bypass in to gnd with a 1f or larger ceramic capacitor. 6 en/set (aat3192/93-1/ -2/-3) led enable and serial control input. en/set is the on/off control for the led and the s 2 cwire digital input for the aat3192/93-1/-2/-3 to control serially the led brightness according to the maximum current set by r set . en/pwm (aat3192/93-4) led on/off and pwm control input. this logic input controls the led outputs for the aat3192/93-4. alternatively, a pwm signal from a gpio or an equivalent signal from a separate controller can be used to control led output current linearly. a pwm signal, rang- ing from 10% to 100% duty cycle, controls the led current linearly between zs and fs. 7 rset a 1% tolerance resistor from this pin to gnd sets the maximum led current level. for optimal led output current accuracy and matching in the aat3192/93-1/-2/-4, a 14.3k resistor sets each full-scale output current to 20ma, maximum. for the aat3192/93-3, a 10.7k resistor is recommended. 8 gnd ground. connect this pin to the systems ground plane. 9 d2 d3 aat3192: led2 current sink input. d2 is the input of led2 current sink. connect led2s anode to out and its cathode to d2. aat3193: led3 current sink input. d3 is the input of led3 current sink. connect led3s anode to out and its cathode to d3. 10 d1 d2 aat3192: led1 current sink input. d1 is the input of led1 current sink. connect led1s anode to out and its cathode to d1. aat3193: led2 current sink input. d2 is the input of led2 current sink. connect led2s anode to out and its cathode to d2. c- c+ in d1 gnd rset en/set n/c 1 3 4 56 7 8 out d2 2 9 10 c- c+ in d2 gnd rset en/set d1 1 3 4 56 7 8 out d3 2 9 10
part number descriptions absolute maximum ratings 1 thermal information symbol description value units p d maximum power dissipation 2, 3 625 mw ja maximum thermal resistance 2 160 c/w symbol description value units in, c+, c-, out, d1, d2, d3, and rset pin voltages to gnd -0.3 to 6.0 v en/set or en/pwm pin voltage to gnd -0.3 to v in + 0.3 v operating junction temperature range -40 to 150 c maximum soldering temperature (at leads, 10 sec) 300 c current control, part number interface inverting aat3192ijq-1 s 2 cwire 16-step aat3192ijq-2 s 2 cwire 8-step aat3192ijq-3 s 2 cwire 4-step AAT3192IJQ-4 pwm linear aat3193ijq-1 s 2 cwire 16-step aat3193ijq-2 s 2 cwire 8-step aat3193ijq-3 s 2 cwire 4-step aat3193ijq-4 pwm linear aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 3193.2007.05.1.0 3 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at co ndi- tions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any o ne time. 2. mounted on an fr4 circuit board. 3. derate 6.25mw/ c above 40 c ambient temperature.
aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 4 3193.2007.05.1.0 electrical characteristics 1 in = en = 3.6v; c in = 1f; c out = 1f; c cp = 1f; r set = 14.3k; t a =-40c to 85c unless otherwise noted. typical values are at t a = 25c. symbol description conditions min typ max units input power supply in input voltage range 2.7 5.5 v en = in, i d1 = i d2 = i d3 = 5ma off (wled test mode) i in input operating current en = in, i d1 = i d2 = i d3 = fs 1.5 ma operating, i d1 = i d2 = i d3 = 4.5 ma open; in = 5v i in(shdn) input shutdown current en/set or en/pwm = gnd 1 a charge pump section i out out maximum output current 100 ma f osc charge pump oscillator frequency 0.65 0.9 1.15 mhz v in _ (th) charge pump mode hysteresis i d1 = i d2 = i d3 = 20ma 115 250 mv t out output start-up time en/set or en/pwm = in 150 s aat3192/93-1/-2/-4: led current sink outputs i d _ (max) d1 - d3 current accuracy data = 1; v in - v f = 1.5v 17.6 19.6 21.6 ma i d _ (max) d1 - d3 current matching data = 1; v in - v f = 1.5v 3 % i d_(data15) d1 - d3 current accuracy data = 15; v in - v f = 1.5v 1.0 1.3 1.56 ma (aat3192/93-1 only) i d_(data8) d1 - d3 current accuracy data = 8; v in - v f = 1.5v 1.0 1.3 1.56 ma (aat3192/93-2 only) i d_(10%) d1 - d3 current accuracy dc = 10%; v in - v f = 1.5v 2.5 ma (aat3192/93-4 only) v d_(th) d1- d3 charge pump mode i d1 = i d2 = i d3 = 20ma 150 mv transition threshold 1. the aat3192/93 are guaranteed to meet performance specification over the -40c to 85c operating temperature range and are assured by design, characterization and correlation with statistical process controls.
aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 3193.2007.05.1.0 5 electrical characteristics 1 in = en = 3.6v; c in = 1f; c out = 1f; c cp = 1f; r set = 14.3k; t a =-40c to 85c unless otherwise noted. typical values are at t a = 25c. symbol description conditions min typ max units aat3192/93-3: led current sink outputs r set = 10.7k; data = 1; i d_(max) d1 - d3 current accuracy v in - v f = 1.5v 17.6 19.6 21.6 ma r set = 10.7 k; data = 1; i d_(max) d1 - d3 current matching v in - v f = 1.5v 3 % i d_(data4) d1 - d3 current accuracy r set = 10.7k; data = 4; v in - v f = 1.5v 0.72 0.9 1.1 ma v d_(th) d1- d3 charge pump mode r set = 10.7k; transition threshold i d1 = i d2 = i d3 = 20ma 150 mv aat3192/93-1/-2/-3: en/set and s 2 cwire control v enh en input high threshold voltage 1.4 v v enl en input low threshold voltage 0.4 v i en(lkg) en input leakage current en/set = in = 5v -1 1 a t en/set(off) en/set input off timeout 500 s t en/set(lat) en/set input latch timeout 500 s t en/set(low) en/set input low time 0.3 75 s t enset(h-min) en/set minimum high time 50 ns t enset(h-max) en/set maximum high time 75 s aat3192/93-4: en/pwm current control v enh en/pwm input high threshold voltage 1.4 v v enl en/pwm input low threshold voltage 0.4 v i en(lkg) en/pwm input leakage current en/pwm = in = 5v -1 1 a t pwm(on) pwm control turn-on delay 2 s t en/pwm en/pwm input off timeout 0.15 1 ms f pwm pwm control frequency duty cycle = 80% 50 khz 1. the aat3192/93 are guaranteed to meet performance specification over the -40c to 85c operating temperature range and are assured by design, characterization and correlation with statistical process controls.
typical characteristics aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 6 3193.2007.05.1.0 turn on to 2x mode (20ma/ch) time (200s/div) en/set (2v/div) v out (2v/div) v sink (2v/div) i in (200ma/div) turn off from 2x mode (20ma/ch) time (200s/div) en/set (2v/div) v out (1v/div) i in (200ma/div) efficiency vs. input voltage input voltage (v) efficiency (%) 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5. 5 10ma v f = 3.2v 20ma v f = 3.5v 30ma v f = 3.8v current matching vs. temperature temperature (c) current (ma) 18.0 18.5 19.0 19.5 20.0 20.5 21.0 -40 -15 10 35 60 85 d1 d2 d3 operating current (no load) vs. input voltage v in (v) i q (ma) 3.00 3.10 3.20 3.30 3.40 3.50 3.60 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 85 c 25 c -45 c 0 c shutdown current vs. temperature temperature ( c) i in(shdn) (a) 0.000 0.002 0.004 0.006 0.008 0.010 -40 -15 10 35 60 85
typical characteristics aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 3193.2007.05.1.0 7 en/set input latch timeout vs. input voltage input voltage (v) t en/set(lat) (s) 100 150 200 250 300 350 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 85c 25c -40c en/set input off timeout vs. input voltage input voltage (v) t en/set(off) (s) 100 150 200 250 300 350 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 85c 25c -40c en input high threshold voltage vs. input voltage input voltage (v) v enh (v) 0.2 0.4 0.6 0.8 1.0 1.2 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5. 5 -40c 25c 85c en input low threshold voltage vs. input voltage input voltage (v) v enl (v) 0.2 0.4 0.6 0.8 1.0 1.2 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 -40c 25c 85c turn on to 1x mode (v in = 4.2v; 20ma/ch) time (200s/div) v f (2v/div) v sink (2v/div) en/set (2v/div) i in (200ma/div) maximum led current vs r set r set (k ) i led (ma) 0 4 8 12 16 20 24 28 32 8 1318 232833
typical characteristics aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 8 3193.2007.05.1.0 output ripple waveform (2x mode; 20ma load) time (1s/div) v out (ac coupled) (20mv/div) v sink (ac coupled) (50mv/div) v in (ac coupled) (20mv/div) input current vs. input voltage input voltage (v) input current (ma) 0 20 40 60 80 100 120 140 160 180 200 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5. 5 v in falling v in rising i led = 30ma i led = 20ma i led = 10ma transition of led current (20ma to 1.3ma) time (100s/div) v out (1v/div) v sink (1v/div) en (2v/div) i in (50ma/div) 4.0v 0.5v transition of led current (1.3ma to 20ma) time (100s/div) v out (1v/div) v sink (1v/div) en (2v/div) i in (50ma/div) 4.2v 1.5v
aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 3193.2007.05.1.0 9 functional block diagram functional description the aat3192 and aat3193 are low-cost charge- pump solutions designed to drive up to three white leds. the charge pump operates from a 2.7v to 5.5v power source and converts it to voltage levels necessary to drive the leds. led current is indi- vidually controlled through integrated current sinks powered from the output of the charge pump. low 1x charge-pump output resistance and low-drop voltage current sinks allow the charge pump to stay in 1x mode with an input voltage as low as 3.75v and led forward voltages as high as 3.5v. once in 2x mode, the charge pump monitors the input supply voltage and automatically switches back to 1x mode when there is sufficient input voltage. the aat3192/93 requires only four external compo- nents: one 1f ceramic capacitor for the charge pump flying capacitors (c p ), one 1f ceramic input capacitor (c in ), one 1f ceramic output capacitor (c out ) and a resistor (r set ) to set the maximum led current. the three constant current outputs of aat3193 (d1 to d3) can drive three individual leds with a maximum current of 30ma each. aat3192 can drives two constant output sinks (d1 and d2) with up to 30ma maximum current each. analogictech's s 2 cwire serial interface enables the aat3192/93-1/ -2/-3 and changes the current sink magnitudes through the en/set pin. the aat3192/93-4 uses an external pwm signal to enable the ic and control the brightness of the leds. constant current control using r set the maximum current is programmed by an external resistor at the rset pin. using a 14.3k external resistor at the rset pin, the aat3192/93-1/-2/-4 includes an integrated serial led current control that sets the full-scale led current between 20ma and 0.63ma. for the aat3192/93-3, a 10.7k external resistor at the rset pin sets the fu ll-scale led cur- rent between 20ma and 1.3ma. the full-scale led current can set higher or lower than 20ma; see table 5. for maximum accuracy, a 1% tolerance resistor is recommended. cC c+ out gnd in d3 d2 d1 s 2 cwire control (pwm control) dac en/set (en/pwm) rset two-mode cp control v f monitoring 3 i ref
aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 10 3193.2007.05.1.0 s 2 cwire serial interface (aat3192/93-1/-2/-3 only) the led output current of aat3192/93 is con- trolled by analogictech's s 2 cwire serial interface. since the led current is programmable, no pwm or additional control circuitry is needed to control led brightness. this feature greatly reduces the burden on a microcontroller or system ic to man- age led or display brightness, allowing the user to "set it and forget it." with its high-speed serial inter- face (1mhz data rate), the led current can be changed quickly and easily. also the non-pulsating led current reduces system noise and improves led reliability. the s 2 cwire interface relies on the number of rising edges to the en/set pin to set the register. a typical write protocol is a burst of en/set rising edges, followed by a pause with en/set held high for at least t lat (500s). the pro- grammed current is then seen at the current sink outputs. when en/set is held low for an amount of time longer than t off (500s), the aat3192/93 enters into shutdown mode and draws less than 1a from the input and the internal data register is reset to zero. the aat3192/93-1/2/3's serial interface reduces the led current on each rising pulse of the enable input. if the aat3192/93 is in shutdown, the first rising edge of the en/set input turns on the led driver to the maximum current. successive rising edges decrease the led current as shown in table 1 and figure 2 for the aat3192/93-1. for the aat3192/93-2, table 2 and figure 3 illustrate an 8-step led current control profile. for the aat3192/93-3, table 3 and figure 4 illustrate a 4-step led current control profile. figure 1. s 2 c serial interface timing table 1: aat3192/93-1 led current settings figure 2: aat3192/93-1 current control profile en rising d1-d3 data edges current (ma) 11 20 2 2 18.7 3 3 17.3 44 16 5 5 14.7 6 6 13.3 77 12 8 8 10.7 9 9 9.3 10 10 8 11 11 6.7 12 12 5.3 13 13 4 14 14 2.7 15 15 1.3 16 16 0.63 1 en/set 2 n-1 n 16 data reg 0 n-1 0 t hi t lo t lat t off s 2 cwire interface data code dx output current (ma) 0.00 5.00 10.00 15.00 20.00 12345678910111213141516
aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 3193.2007.05.1.0 11 table 2: aat3192/93-2 led current settings figure 3: aat3192/93-2 current control profile en rising d1-d3 data edges current (ma) 11 20 2 2 17.3 3 3 14.7 44 12 5 5 9.3 6 6 6.7 77 4 8 8 1.3 table 3: aat3192/93-3 led current settings figure 4: aat3192/93-3 current control profile en rising d1-d3 data edges current (ma) 11 20 2 2 13.3 3 3 6.7 4 4 0.87 pwm control (aat3192/93-4 only) pwm (pulse width modulation) is an industry stan- dard technique of controlling led brightness by modulating the conduction duty cycle of the led current. led brightness is determined by the aver- age value of the pwm signal multiplied by the leds intensity where intensity is proportional to the led drive current. a pwm control signal can be applied into the en/pwm pin of the aat3192/93-4. by changing the duty cycle of the pwm signal from 100% (logic high) to 10%, leds sink current can be programmed from 20ma to 2.4ma. to save power when not used, aat3192/93-4 can be shutdown by holding the en/pwm pin low for 1ms. lastly, table 4 and figure 5 illustrate the aat3192/93-4s led current control profile as a function of a pwm control signal. s 2 cwire interface data code dx output current (ma) 0.00 5.00 10.00 15.00 20.00 1234567 8 s 2 cwire interface data code dx output current (ma) 0.00 5.00 10.00 15.00 20.00 1234
aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 12 3193.2007.05.1.0 table 4: aat3192/93-4 led current settings figure 5: aat3192/93-4 current control profile applications information led selection the aat3192/93 is specifically intended for driving white leds. however, the device design will allow the aat3192/93 to drive most types of leds with forward voltage specifications ranging from 2.2v to 4.7v. led applications may include mixed arrange- ments for display backlighting, keypad display, and any other application needing a constant current sink generated from a varying input voltage. since the d1 to d3 constant current sinks are matched with negligible supply voltage dependence, the constant current channels will be matched regard- less of the specific led forward voltage (v f ) levels. the low dropout current sinks in the aat3192/93 maximize performance and make it capable of driv- ing leds with high forward voltages. multiple chan- nels can be combined to obtain a higher led drive current without complication. constant current setting the led current is controlled by the r set resistor. for maximum accuracy, a 1% tolerance resistor is recommended. table 5 shows the r set resistor value for aat3193-1/2/4 for various led full-scale current levels. table 5: maximum led current and r set resistor values (1% resistor tolerance) for the aat3193-1/2/4. device switching noise performance the aat3192/93 operates at a fixed frequency of approximately 1mhz to control noise and limit har- monics that can interfere with the rf operation of mobile communication devices. back-injected noise appearing on the input pin of the charge pump is 20mv peak-to peak, typically ten times less than inductor-based dc/dc boost converter white led backlight solutions. the aat3192/93 soft-start feature prevents noise transient effects i led (ma) r set (k?) 30 9.53 20 14.3 15 19.1 10 28.7 en/pwm d1-d3 duty cycle current (ma) 100% 20 90% 17.9 80% 15.9 70% 14 60% 12.1 50% 10.1 40% 8.2 30% 6.3 20% 4.3 10% 2.4 en/pwm input pin duty cycle (%) dx output current (ma) 0.00 5.00 10.00 15.00 20.00 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 3193.2007.05.1.0 13 associated with inrush currents during start-up of the charge pump circuit. shutdown since the current switches are the only power returns for all loads, there is no leakage current when all sink switches are disabled. to activate the shutdown operation, the en/set input for the aat3192/93-1/2/3 should be strobed low for longer than t off (500s). for the 3192/93-4 pwm options, shutdown operation is enabled when the en/pwm input is strobed low longer than 1ms.in this state, the aat3192/93 typically draws less than 1a from the input. registers are reset to 0 in shutdown. power efficiency and device evaluation the charge pump efficiency discussion in the follow- ing sections accounts only for efficiency of the charge pump section itself. due to the unique circuit architecture and design of the aat3192/93, it is very difficult to measure efficiency in terms of a percent value comparing input power over output power. since the aat3192/93 outputs are pure constant current sinks and typically drive individual loads, it is difficult to measure the output voltage for a given output to derive an overall output power measure- ment. for any given application, white led forward voltage levels can differ, yet the output drive cur- rent will be maintained as a constant. this makes quantifying output power a difficult task when taken in the context of comparing to other white led driver circuit topologies. a better way to quantify total device efficiency is to observe the total input power to the device for a given led current drive level. the best white led driver for a given application should be based on trade-offs of size, external component count, reliability, operating range, and total energy usage...not just % efficiency. the aat3192/93 efficiency may be quantified under very specific conditions and is dependent upon the input voltage versus the output voltage across the loads applied to outputs d1 through d3 (or d2 in the case of the aat3192) for a given constant current setting. depending on the combination of v in and voltages sensed at the current sinks, the device will operate in load switch mode. when any one of the voltages sensed at the current sinks nears dropout, the device will operate in 2x charge pump mode. each of these modes will yield different efficiency values. refer to the following two sections for expla- nations for each operational mode. 1x mode efficiency the aat3192/93 1x mode is operational at all times and functions alone to enhance device power conversion efficiency when v in is higher than the voltage across the load. when in 1x mode, voltage conversion efficiency is defined as output power divided by input power. an expression for the ideal efficiency ( ) in 1x charge-pump mode can be expressed as: -or- 2x charge pump mode efficiency the aat3192/93 contains a charge pump which will boost the input supply voltage in the event where v in is less than the voltage required to sup- ply the output. the efficiency ( ) can be simply defined as a linear voltage regulator with an effec- tive output voltage that is equal to one and two times the input voltage. efficiency ( ) for an ideal 2x charge pump can typically be expressed as the output power divided by the input power. in addition, with an ideal 2x charge pump, the out- put current may be expressed as 1/3 of the input current. the expression to define the ideal efficien- cy ( ) can be rewritten as: -or- for a charge pump with an output of 5v and a nomi- nal input of 3.5v, the theoretical efficiency is 71%. (%) = 100 v f 2v in ?? ?? = p out = v f i led = v f p in v in 2i out 2v in = p f p in (%) = 100 v f v in ?? ?? = p out = v f i led ? v f p in v in i out v in
aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 14 3193.2007.05.1.0 due to internal switching losses and ic quiescent cur- rent consumption, the actual efficiency can be meas- ured at 90%. efficiency will decrease substantially as load current drops below 1ma or when the voltage level at v in approaches the voltage level at v out . additional applications the current sinks of the aat3192 and the aat3193 can be combined to drive higher current levels through a single led. as an example, a single led can be driven at 60ma total by combining together the d1-d3 outputs. figure 6: higher current, single led application. for lower-cost applications, the flying capacitor can be removed. this will force aat3192/93 to operate in 1x mode. to maintain regulated led current, the input supply voltage has to be higher than the charge-pump's dropout voltage in 1x mode. figure 7: lower cost 1x mode application. capacitor selection careful selection of the three external capacitors c in , c p , and c out is important because they will affect turn-on time, output ripple, and transient per- formance. optimum performance will be obtained when low equivalent series resistance (esr) ceramic capacitors are used; in general, low esr may be defined as less than 100m. a value of 1f for all four capacitors is a good starting point when choosing capacitors. if the constant current sinks are only programmed for light current levels, then the capacitor size may be decreased. capacitor characteristics ceramic composition capacitors are highly recom- mended over all other types of capacitors for use with the aat3192/93. ceramic capacitors offer many advantages over their tantalum and aluminum elec- trolytic counterparts. a ceramic capacitor typically has very low esr, is lowest cost, has a smaller pcb foot- print, and is non-polarized. low esr ceramic capaci- tors help maximizing charge pump transient response. since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage. equivalent series resistance esr is an important characteristic to consider when selecting a capacitor. esr is a resistance internal to a capacitor that is caused by the leads, internal con- nections, size or area, material composition, and ambient temperature. capacitor esr is typically measured in milliohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. ceramic capacitor materials ceramic capacitors less than 0.1f are typically made from npo or c0g materials. npo and c0g materials generally have tight tolerance and are very stable over temperature. larger capacitor values are usually composed of x7r, x5r, z5u, or y5v dielec- tric materials. large ceramic capacitors (i.e., larger than 2.2f) are often available in low cost y5v and z5u dielectrics, but capacitors larger than 1f are not typically required for aat3192/93 applications. capacitor area is another contributor to esr. capacitors that are physically large will have a lower esr when compared to an equivalent material smaller capacitor. these larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size. c2 1f c3 1f d2 d1 d3 d1 1 out 2 c- 3 c+ 4 7 8 9 10 6 in d2 d3 gnd rset en/set 5 u1 r1 14.3k aat3193 vin en/set 1f c3 1f c2 d1 d1 1 out 2 c- 3 c+ 4 7 8 d3 9 d2 rset en/set gnd 10 6 in 5 14.3k r1 aat3193 vin en/set c1 1f
aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 3193.2007.05.1.0 15 evaluation board schematic evaluation board layout figure 8: aat3193 evaluation board figure 9: aat3193 evaluation board top side layout. bottom side layout. vdd 1 gp5 2 gp4 3 gp3 4 gp2 5 gp1 6 gp0 7 vss 8 pic12f675 u2 1f c1 1f c2 1f c3 1f c5 1k r1 1k r2 1k r3 330 r5 1 2 3 j1 1 2 3 4 5 0 down sw1 1 2 3 4 5 0 up sw2 red led7 1 2 3 4 5 0 cycle sw3 dc+ dc- d2 d1 d3 gnd vin gnd gnd pot10k vr4 grn led0 330 r4 gnd gnd gnd j2 100k r6 220 r7 gnd vin jp5 d1 1 out 2 c- 3 c+ 4 rset 7 gnd 8 d3 9 d2 10 en/set 6 in 5 u1 14.3k r1 gnd jpx aa t3193
aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 16 3193.2007.05.1.0 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . ordering information current control, package interface inverting marking part number (tape and reel) sc70jw-10 s 2 cwire 16-step aat3192ijq-1-t1 sc70jw-10 s 2 cwire 8-step aat3192ijq-2-t1 sc70jw-10 s 2 cwire 4-step aat3192ijq-3-t1 sc70jw-10 pwm linear AAT3192IJQ-4-t1 sc70jw-10 s 2 cwire 16-step xgxyy aat3193ijq-1-t1 sc70jw-10 s 2 cwire 8-step aat3193ijq-2-t1 sc70jw-10 s 2 cwire 4-step aat3193ijq-3-t1 sc70jw-10 pwm linear aat3193ijq-4-t1 all analogictech products are offered in pb-free packaging. the term pb-free means semiconductor products that are in compliance with current rohs standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. for more information, please visit our website at http://www.analogictech.com/pbfree.
aat3192/93 low-cost, 2-/3-channel charge-pump led drivers 3193.2007.05.1.0 17 package information sc70jw-10 all dimensions in millimeters. advanced analogic technologies, inc. 830 e. arques avenue, sunnyvale, ca 94085 phone (408) 737- 4600 fax (408) 737- 4611 ? advanced analogic technologies, inc. analogictech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an analogictech pr oduct. no circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. analogictech reserves the right to make changes to their products or specifications or to discontinue any product or service with- out notice. except as provided in analogictechs terms and conditions of sale, analogictech assumes no liability whatsoever, an d analogictech disclaims any express or implied war- ranty relating to the sale and/or use of analogictech products including liability or warranties relating to fitness for a part icular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. in order to minimize risks associated with the customers applications, adequa te design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. testing and other quality control techniques are utilized to the extent an alogictech deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed. analogictech and the analogictech logo are trad emarks of advanced analogic technologies incorporated. all other brand and product names appearing in this document are registered trademarks or trademarks of their respective holder s. 0.45

▲Up To Search▲

Price & Availability of AAT3192IJQ-4

	To Download AAT3192IJQ-4 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .