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general description the max8740 is a high-performance, step-up dc-dc converter that provides a regulated supply voltage for active-matrix, thin-film transistor (tft), liquid-crystal displays (lcds). the max8740 incorporates current- mode, fixed-frequency, pulse-width modulation (pwm) circuitry with a built-in n-channel power mosfet to achieve high efficiency and fast transient response. users can select 640khz or 1.2mhz operation using a logic input pin (freq). the high switching frequencies allow the use of ultra-small inductors and low-esr ceramic capacitors. the current-mode architecture pro- vides fast transient response to pulsed loads. a com- pensation pin (comp) gives users flexibility in adjusting loop dynamics. the 30v internal mosfet can generate output voltages up to 28v from a 2.6v and 5.5v input voltage range. soft-start slowly ramps the input current and is programmed with an external capacitor. the max8740 is available in a 10-pin thin dfn package. applications notebook computer displays lcd monitor panels features ? 90% efficiency ? adjustable output from v in to 28v ? 2.6v to 5.5v input supply range ? input supply undervoltage lockout ? pin-programmable 640khz/1.2mhz switching frequency ? programmable soft-start ? 0.1? shutdown current ? small, 10-pin thin dfn package max8740 tft-lcd step-up dc-dc converter ________________________________________________________________ maxim integrated products 1 ordering information 19-3698; rev 0; 5/05 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. evaluation kit available part temp range pin-package MAX8740ETB -40 c to +85 c 10 tdfn 3mm x 3mm comp 1 fb 2 3 gnd 4 gnd 5 10 9 8 7 6 shdn ss freq lx lx in max8740 top view thin dfn 3mm x 3mm pin configuration lx lx fb gnd gnd freq in comp ss 1 4 5 2 3 9 8 67 10 v out v in 2.6v to 5.5v shdn max8740 minimal operating circuit
max8740 tft-lcd step-up dc-dc converter 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v in = v s hdn = 3v, t a = 0? to +85? . typical values are at t a = +25?, unless otherwise noted.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. lx to gnd ..............................................................-0.3v to +30v in, shdn , freq, fb to gnd ...................................-0.3v to +6v comp, ss to gnd .......................................-0.3v to (v in + 0.3v) lx switch maximum continuous rms current .....................2.4a continuous power dissipation (t a = +70 c) 10-pin tdfn (derate 24.1mw/ c above +70 c) .......1481.5mw operating temperature range ...........................-40 c to +85 c junction temperature ......................................................+150 c storage temperature range .............................-65 c to +160 c lead temperature (soldering, 10s) .................................+300 c parameter conditions min typ max units v out < 18v 2.6 5.5 input voltage range 18v < v out < 24v 4.0 5.5 v output voltage range 28 v in undervoltage-lockout threshold v in rising, typical hysteresis is 50mv; lx remains off below this level 2.20 2.38 2.57 v v fb = 1.3v, not switching 0.22 0.44 in quiescent current v fb = 1.0v, switching, freq = gnd 2 5 ma in shutdown current shdn = gnd 0.1 10.0 ? error amplifier fb regulation voltage level to produce v comp = 1.24v 1.22 1.24 1.26 v fb input bias current v fb = 1.24v 50 125 250 na fb line regulation level to produce v comp = 1.24v, v in = 2.6v to 5.5v 0.05 0.15 %/v transconductance 100 200 315 ? voltage gain 2400 v/v oscillator freq = gnd 540 640 740 frequency freq = in 1000 1220 1500 khz maximum duty cycle 88 91 94 % n-channel mosfet current limit v fb = 1v, 71% duty cycle 3.9 4.6 5.3 a v in = 3v (typ value at t a = +25?) 0.11 0.17 on-resistance v in = 5v (typ value at t a = +25?) 0.095 0.15 ? leakage current v lx = 28v 30 55 ? current-sense transresistance 0.09 0.15 0.25 v/a soft-start reset switch resistance 100 ? charge current v ss = 1.2v 2.5 4.5 7.5 ?
max8740 tft-lcd step-up dc-dc converter _______________________________________________________________________________________ 3 electrical characteristics (continued) (v in = v s hdn = 3v, t a = 0? to +85? . typical values are at t a = +25?, unless otherwise noted.) parameter conditions min typ max units control inputs shdn , freq input low voltage v in = 2.6v to 5.5v 0.3 x v in v shdn , freq input high voltage v in = 2.6v to 5.5v 0.7 x v in v shdn , freq input hysteresis v in = 2.6v to 5.5v 0.1 x v in v freq pulldown current 2.3 6.0 9.5 ? shdn input current shdn = gnd 0.001 1a electrical characteristics (v in = v s hdn = 3v, t a = -40? to +85? , unless otherwise noted.) (note 1) parameter conditions min typ max units v out < 18v 2.6 5.5 input voltage range 18v < v out < 28v 4.0 5.5 v output voltage range 28 v v fb = 1.3v, not switching 0.44 in quiescent current v fb = 1.0v, switching, freq = gnd 5 ma in shutdown current shdn = gnd 10 ? error amplifier fb regulation voltage level to produce v comp = 1.24v 1.215 1.260 v fb line regulation level to produce v comp = 1.24v, v in = 2.6v to 5.5v 0.15 %/v transconductance 100 330 ? oscillator freq = gnd 490 770 frequency freq = in 900 1600 khz n-channel mosfet current limit v fb = 1v, 71% duty cycle 3.9 5.3 a current-sense transresistance 0.09 0.25 v/a control inputs shdn , freq input low voltage v in = 2.6v to 5.5v 0.3 x v in v shdn , freq input high voltage v in = 2.6v to 5.5v 0.7 x v in v note 1: -40? specifications are guaranteed by design, not production tested.
max8740 tft-lcd step-up dc-dc converter 4 _______________________________________________________________________________________ efficiency vs. load current (1.2mhz operation) max8740 toc01 load current (ma) efficiency (%) 100 10 50 60 70 80 90 100 40 1100 0 l = 2.7 h f osc = 1.2mhz v in = 5.0v v in = 3.3v efficiency vs. load current max8740 toc02 load current (ma) efficiency (%) 100 10 50 60 70 80 90 100 40 1 1000 l = 5.6 h f osc = 640khz v in = 5.0v v in = 3.3v max8740 toc03 output voltage vs. load current load current (ma) output voltage (v) 11010010 00 10,000 11.5 11.7 11.9 12.1 12.3 12.5 12.7 12.9 v in = 5.0v v in = 3.3v f osc = 1.2mhz l = 2.7 h max8740 toc04 switching frequency vs. input voltage input voltage (v) switching frequency (khz) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 400 600 800 1000 1200 1400 freq = in freq = gnd max8740 toc05 supply current vs. supply voltage supply voltage (v) supply current (ma) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.1 0.2 0.3 0.4 0.5 0.6 0.7 switching nonswitching max8740 toc06 supply current vs. temperature (switching) temperature ( c) supply current (ma) -40 -20 0 20 40 60 80 100 0.45 0.50 0.55 0.60 v in = 5.0v v in = 3.3v soft-start (r load = 30 ? ) max8740 toc07 2ms/div switching waveforms (i load = 800ma) max8740 toc08 400ns/div t ypical operating characteristics (circuit of figure 1. v in = 5v, v main = 15v, t a = +25 c, unless otherwise noted.)
max8740 tft-lcd step-up dc-dc converter _______________________________________________________________________________________ 5 pin name function 1 comp compensation pin for error amplifier. connect a series rc from comp to ground. see the loop compensation section for component selection guidelines. 2fb feedback pin. the fb regulation voltage is 1.24v nominal. connect an external resistive voltage-divider between the step-up regulator? output (v out ) and gnd, with the center tap connected to fb. place the divider close to the ic and minimize the trace area to reduce noise coupling. set v out according to the output voltage selection section. 3 shdn shutdown control input. drive shdn low to turn off the max8740. 4, 5 gnd ground. connect pins 4 and 5 directly together. 6, 7 lx switch pin. lx is the drain of the internal mosfet. connect the inductor/rectifier diode junction to lx and minimize the trace area for lower emi. connect pins 6 and 7 directly together. 8i n supply pin. bypass in with a minimum 1? ceramic capacitor directly to gnd. 9 freq frequency-select input. when freq is low, the oscillator frequency is set to 640khz. when freq is high, the frequency is 1.2mhz. this input has a 5? pulldown current. 10 ss soft-start control pin. connect a soft-start capacitor (c ss ) to this pin. leave open for no soft-start. the soft- start capacitor is charged with a constant current of 4.5?. full current limit is reached after t = 2.5 x 10 5 c ss . the soft-start capacitor is discharged to ground when shdn is low. when shdn goes high, the soft-start capacitor is charged to 0.4v, after which soft-start begins. pin description lx lx fb gnd gnd freq in comp ss 1 4 5 2 3 9 8 67 10 v out 13.5v/800ma v in 4.5v to 5.5v shdn max8740 c1 10 f 6.3v r3 10 ? c3 1 f c6 33nf c4 560pf c5 68pf l1 2.7 h d1 r2 20k ? 1% r4 47k ? 1% r1 196k ? 1% c2 10 f 20v c7 10 f 20v figure 1. typical operating circuit
max8740 tft-lcd step-up dc-dc converter 6 _______________________________________________________________________________________ detailed description the max8740 is a highly efficient power supply that employs a current-mode, fixed-frequency, pwm archi- tecture for fast transient response and low-noise opera- tion. the device regulates the output voltage through a combination of an error amplifier, two comparators, and several signal generators (figure 2). the error amplifier compares the signal at fb to 1.24v and varies the comp output. the voltage at comp determines the current trip point each time the internal mosfet turns on. as the load changes, the error amplifier sources or sinks current to the comp output to command the inductor peak current necessary to service the load. to maintain stability at high duty cycles, a slope-compen- sation signal is summed with the current-sense signal. at light loads, this architecture allows the max8740 to ?kip?cycles to prevent overcharging the output voltage. in this region of operation, the inductor ramps up to a peak value of approximately 150ma, discharges to the output, and waits until another pulse is needed again. output current capability the output current capability of the max8740 is a func- tion of current limit, input voltage, operating frequency, and inductor value. because of the slope compensa- tion used to stabilize the feedback loop, the inductor current limit depends on the duty cycle. the current limit is determined by the following equation: i lim = (1.26 - 0.35 x d) x i lim_ec where i lim _ ec is the current limit specified at 71% duty cycle (see the electrical characteristics table) and d is the duty cycle. the output current capability depends on the current- limit value and is governed by the following equation: where i lim is the current limit calculated above, is the regulator efficiency (85% nominal), and d is the duty cycle. the duty cycle when operating at the current limit is: where v diode is the rectifier diode forward voltage and r on is the on-resistance of the internal mosfet. d vvv virv out in diode out lim on diode = ?+ ? + ii dv fl v v out max lim in osc in out () . =? ? ? ? ? ? ? ? ? 05 gnd lx in freq fb comp 4 a 5 a n error comparator error amplifier skip comparator ss clock skip bias shdn max8740 current sense control and driver logic soft- start slope compen- sation oscillator 1.24v figure 2. functional diagram
max8740 tft-lcd step-up dc-dc converter _______________________________________________________________________________________ 7 soft-start the max8740 can be programmed for soft-start upon power-up with an external capacitor. when the shutdown pin is taken high, the soft-start capacitor (c ss ) is immedi- ately charged to 0.4v. then the capacitor is charged at a constant current of 4.5? (typ). during this time, the ss voltage directly controls the peak inductor current, allow- ing 0a at v ss = 0.4v to the full current limit at v ss = 1.5v. the maximum load current is available after the soft-start is completed. when the shdn pin is taken low, the soft- start capacitor is discharged to ground. frequency selection the max8740? frequency can be user selected to oper- ate at either 640khz or 1.2mhz. connect freq to gnd for 640khz operation. for a 1.2mhz switching frequency, connect freq to in. this allows the use of small, mini- mum-height external components while maintaining low output noise. freq has an internal pulldown, allowing the user the option of leaving freq unconnected for 640khz operation. shutdown the max8740 shuts down to reduce the supply current to 0.1? when shdn is low. in this mode, the internal reference, error amplifier, comparators, and biasing cir- cuitry turn off, and the n-channel mosfet is turned off. the step-up regulator? output is connected to in by the external inductor and rectifier diode. applications information step-up regulators using the max8740 can be designed by performing simple calculations for a first iteration. all designs should be prototyped and tested prior to pro- duction. table 1 provides a list of power components for the typical applications circuit. table 2 lists component suppliers. external-component-value choice is primarily dictated by the output voltage and the maximum load current, as well as maximum and minimum input voltages. begin by selecting an inductor value. once l is known, choose the diode and capacitors. inductor selection the minimum inductance value, peak current rating, and series resistance are factors to consider when selecting the inductor. these factors influence the converter? effi- ciency, maximum output load capability, transient- response time, and output voltage ripple. physical size and cost are also important factors to be considered. the maximum output current, input voltage, output volt- age, and switching frequency determine the inductor value. very high inductance values minimize the cur- rent ripple and therefore reduce the peak current, which decreases core losses in the inductor and i 2 r losses in the entire power path. however, large induc- tor values also require more energy storage and more turns of wire, which increase physical size and can increase i 2 r losses in the inductor. low inductance val- ues decrease the physical size but increase the current ripple and peak current. finding the best inductor involves choosing the best compromise between circuit efficiency, inductor size, and cost. designation description c1 10? ?0%, 6.3v x5r ceramic capacitor (0805) murata grm21br60j106k taiyo yuden jmk212bj106kd c2, c7 10? ?0%, 25v x5r ceramic capacitors (1210) tdk c3225x5r1e106m, taiyo yuden tmk325bj106mm d1 3a, 40v schottky diode (sm8) central semiconductor cmsh3-40m l1 3.3? ?0%, 4.0a power inductor sumida cdrh8d28-3r3, 3.3? (alternate : sumida cdrh103r-3r3, 3.3?) table 1. component list supplier phone fax website murata 770-436-1300 770-436-3030 www.murata.com sumida 847-545-6700 847-545-6720 www.sumida.com taiyo yuden 800-348-2496 847-925-0899 www.t-yuden.com tdk 847-803-6100 847-390-4405 www.component.tdk.com toshiba 949-455-2000 949-859-3963 www.toshiba.com/taec table 2. component suppliers
max8740 tft-lcd step-up dc-dc converter 8 _______________________________________________________________________________________ the equations used here include a constant lir, which is the ratio of the inductor peak-to-peak ripple current to the average dc inductor current at the full load cur- rent. the best trade-off between inductor size and cir- cuit efficiency for step-up regulators generally has an lir between 0.3 and 0.5. however, depending on the ac characteristics of the inductor core material and the ratio of inductor resistance to other power path resis- tances, the best lir can shift up or down. if the induc- tor resistance is relatively high, more ripple can be accepted to reduce the number of turns required and increase the wire diameter. if the inductor resistance is relatively low, increasing inductance to lower the peak current can decrease losses throughout the power path. if extremely thin high-resistance inductors are used, as is common for lcd panel applications, the best lir can increase to between 0.5 and 1.0. once a physical inductor is chosen, higher and lower values of the inductor should be evaluated for efficien- cy improvements in typical operating regions. calculate the approximate inductor value using the typ- ical input voltage (v in ), the maximum output current (i out(max) ), the expected efficiency ( typ ) taken from an appropriate curve in the typical operating characteristics , and an estimate of lir based on the above discussion: choose an available inductor value from an appropriate inductor family. calculate the maximum dc input cur- rent at the minimum input voltage v in(min) using con- servation of energy and the expected efficiency at that operating point ( min ) taken from an appropriate curve in the typical operating characteristics : calculate the ripple current at that operating point and the peak current required for the inductor: the inductor? saturation current rating and the max8740? lx current limit (i lim ) should exceed i peak , and the inductor? dc current rating should exceed i in(dc,max) . for good efficiency, choose an inductor with less than 0.1 ? series resistance. considering the typical operating circuit, the maximum load current (i out(max) ) is 900ma with a 13.5v output and a 5v typical input voltage. choosing an lir of 0.35 and estimating efficiency of 85% at this operating point: using the circuit? minimum input voltage (4.5v) and estimating efficiency of 85% at that operating point: the ripple current and the peak current are: output capacitor selection the total output voltage ripple has two components: the capacitive ripple caused by the charging and discharg- ing of the output capacitance, and the ohmic ripple due to the capacitor? equivalent series resistance (esr): where i peak is the peak inductor current (see the inductor selection section). for ceramic capacitors, the output voltage ripple is typically dominated by v ripple(c) . the voltage rating and temperature charac- teristics of the output capacitor must also be considered. vv v v i c vv vf and vir ripple ripple c ripple esr ripple c out out out in out osc ripple esr peak esr cout , () ( ) () () ( ) =+ ? ? ? ? ? ? ? i vvv hv mhz a ia a a ripple peak . (. .) . . . . . . . = ? ? =+ 45 12 545 27 13 512 093 32 093 2 37 i av v a in dc max (, ) . . . . . = 09 35 45 085 32 l v v vv a mhz h . . . . . . . = ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 5 13 5 13 5 5 09 12 085 035 27 2 ii i peak in dc max ripple (, ) =+ 2 i vvv lv f ripple in min out in min out osc ( ) () () = ? i iv v in dc max out max out in min min (, ) () () = l v v vv if lir in out out in out max osc typ () = ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 2
max8740 tft-lcd step-up dc-dc converter _______________________________________________________________________________________ 9 input capacitor selection the input capacitor (c in ) reduces the current peaks drawn from the input supply and reduces noise injection into the ic. a 10? ceramic capacitor is used in the typi- cal operating circuit (figure 1) because of the high source impedance seen in typical lab setups. actual applications usually have much lower source imped- ance since the step-up regulator often runs directly from the output of another regulated supply. typically, c in can be reduced below the values used in the typical operating circuit. ensure a low noise supply at in by using adequate c in . alternatively, greater voltage varia- tion can be tolerated on c in if in is decoupled from c in using an rc lowpass filter (see r3 and c3 in figure 1). rectifier diode selection the max8740? high switching frequency demands a high-speed rectifier. schottky diodes are recommend- ed for most applications because of their fast recovery time and low forward voltage. the diode should be rated to handle the output voltage and the peak switch current. make sure that the diode? peak current rating is at least i peak calculated in the inductor selection section and that its breakdown voltage exceeds the output voltage. output voltage selection the max8740 operates with an adjustable output from v in to 28v. connect a resistive voltage-divider from the output (v out ) to gnd with the center tap connected to fb (see figure 1). select r2 in the 10k ? to 50k ? range. calculate r1 with the following equation: where v fb , the step-up regulator? feedback set point, is 1.28v (typ). place r1 and r2 close to the ic. loop compensation the voltage feedback loop needs proper compensation to prevent excessive output ripple and poor efficiency caused by instability. this is done by connecting a resistor (r comp ) and capacitor (c comp ) in series from comp to gnd, and another capacitor (c comp2 ) from comp to gnd. r comp is chosen to set the high-fre- quency integrator gain for fast transient response, while c comp is chosen to set the integrator zero to maintain loop stability. the second capacitor, c comp2 , is cho- sen to cancel the zero introduced by output-capaci- tance esr. for optimal performance, choose the com- ponents using the following equations: for the ceramic output capacitor, where esr is small, c comp2 is optional. the best gauge of correct loop compensation is by inspecting the transient response of the max8740. adjust r comp and c comp as neces- sary to obtain optimal transient performance. soft-start capacitor the soft-start capacitor should be large enough that it does not reach final value before the output has reached regulation. calculate c ss to be: where c out is the total output capacitance including any bypass capacitor on the output bus, v out is the maximum output voltage, i inrush is the peak inrush current allowed, i out is the maximum output current during power-up, and v in is the minimum input voltage. the load must wait for the soft-start cycle to finish before drawing a significant amount of load current. the duration after which the load can begin to draw maximum load current is: t max = 6.77 x 10 5 x c ss cc vvv vi i v ss out out in out in inrush out out > ? ? ? ? ? ? ? ? ? ? ? ? ? 21 10 6 2 r vv c li c vc ir c rli vv comp in out out out max comp out out out max comp comp esr out max in out . () () () 315 10 0 0036 2 rr v v out fb 12 1 = ? ? ? ? ? ? ?
max8740 tft-lcd step-up dc-dc converter 10 ______________________________________________________________________________________ multiple-output power supply for tft lcd figure 3 shows a power supply for active-matrix tft- lcd flat-panel displays. output-voltage transient perfor- mance is a function of the load characteristic. add or remove output capacitance (and recalculate compensa- tion-network component values) as necessary to meet the required transient performance. regulation perfor- mance for secondary outputs (v2 and v3) depends on the load characteristics of all three outputs. pc board layout and grounding careful pc board layout is important for proper operation. use the following guidelines for good pc board layout: 1) minimize the area of high-current loops by placing the inductor, rectifier diode, and output capacitors near the input capacitors and near the lx and gnd pins. the high-current input loop goes from the positive terminal of the input capacitor to the induc- tor, to the ic? lx pin, out of gnd, and to the input capacitor? negative terminal. the high-current out- put loop is from the positive terminal of the input capacitor to the inductor, to the rectifier diode (d1), and to the positive terminal of the output capacitors, reconnecting between the output capacitor and input capacitor ground terminals. connect these loop components with short, wide connections. avoid using vias in the high-current paths. if vias are unavoidable, use many vias in parallel to reduce resistance and inductance. 2) create a power ground island (pgnd) consisting of the input and output capacitor grounds and gnd pins. connect all of these together with short, wide traces or a small ground plane. maximizing the width of the power ground traces improves efficien- cy and reduces output voltage ripple and noise spikes. create an analog ground plane (agnd) consisting of the feedback-divider ground connec- tion, the comp and ss capacitor ground connec- tions, and the device? exposed backside pad. connect the agnd and pgnd islands by connect- ing the gnd pins directly to the exposed backside pad. make no other connections between these separate ground planes. lx lx fb gnd gnd freq in comp ss 1 4 5 2 3 9 8 67 10 v in 4.5v to 5.5v shdn max8740 c1 10 f 6.3v r4 10 ? c5 1 f c4 33nf c3 560pf c6 68pf l1 2.7 h d1 r2 20k ? 1% r3 47k ? 1% r1 196k ? 1% v2 +28v c9 1 f d2 d3 c7 0.1 f c8 0.1 f v3 -10v c10 0.22 f v out 13.5v/800ma c2 10 f 25v c7 10 f 25v figure 3. multiple-output tft-lcd power supply
max8740 tft-lcd step-up dc-dc converter ______________________________________________________________________________________ 11 3) place the feedback voltage-divider-resistors as close to the fb pin as possible. the divider? center trace should be kept short. placing the resistors far away causes the fb trace to become an antenna that can pick up switching noise. avoid running the feedback trace near lx. 4) place the in pin bypass capacitor as close to the device as possible. the ground connection of the in bypass capacitor should be connected directly to gnd pins with a wide trace. 5) minimize the length and maximize the width of the traces between the output capacitors and the load for best transient responses. 6) minimize the size of the lx node while keeping it wide and short. keep the lx node away from the feedback node and analog ground. use dc traces as a shield if necessary. refer to the max8740 evaluation kit for an example of proper board layout. chip information transistor count: 2746 process: bicmos
tft-lcd step-up dc-dc converter package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) max8740 maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 12 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. 6, 8, &10l, dfn thin.eps l c l c pin 1 index area d e l e l a e e2 n g 1 2 21-0137 package outline, 6,8,10 & 14l, tdfn, exposed pad, 3x3x0.80 mm -drawing not to scale- k e [(n/2)-1] x e ref. pin 1 id 0.35x0.35 detail a b d2 a2 a1 common dimensions symbol min. max. a 0.70 0.80 d 2.90 3.10 e 2.90 3.10 a1 0.00 0.05 l 0.20 0.40 pkg. code n d2 e2 e jedec spec b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.300.10 1.500.10 6 t633-1 0.95 bsc mo229 / weea 1.90 ref 0.400.05 1.95 ref 0.300.05 0.65 bsc 2.300.10 8 t833-1 2.00 ref 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 ref 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 1.500.10 mo229 / weec mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 ref t1433-2 14 2.300.10 1.700.10 t633-2 6 1.500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 ref t833-2 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref t833-3 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref -drawing not to scale- g 2 2 21-0137 package outline, 6,8,10 & 14l, tdfn, exposed pad, 3x3x0.80 mm downbonds allowed no no no no yes no yes no

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