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general description the MAX8901A/max8901b step-up converters drive from two to six series-connected white leds (wleds) with constant current to provide uniform wled intensity for lcd backlighting in cell phones, pdas, and other hand- held devices. the max8901_ operate at a fixed 750khz (typ) switching frequency, allowing for tiny external com- ponents, and are optimized for the highest possible effi- ciency over the full 1-cell li+/li-poly battery range. these converters use a single input (on) to enable the ic and to control wled intensity. the MAX8901A requires a direct pwm input to regulate wled intensity with the wled current proportional to the pwm duty cycle. the max8901b uses single-wire, serial-pulse dimming that reduces the wled intensity in 32 linear steps. full-scale wled current for serial-pulse dimming is 24.75ma (max8901b, 0.75ma/step). the max8901_ features an internal soft-start to eliminate inrush currents during startup, input overvoltage protection, wled overvoltage protection, and a shut- down mode with 0.01? (typ) shutdown current. no wled current is present in shutdown provided the wled forward voltage is greater than the input supply voltage. additional features include undervoltage lock- out (uvlo) and thermal shutdown. the max8901_ are available in tiny 8-pin, 2mm x 2mm tdfn-ep packages (0.8mm max height). applications display backlight (from 2 to 6 wleds) cellular phones pdas and smartphones mp3 and portable media players portable navigation devices digital cameras features ? high efficiency, up to 91% ? 2.6v to 5.5v input voltage range ? fixed-frequency operation ? supplies from 2 to 6 wleds with 1% led current accuracy ? flexible dimming control direct pwm dimming (MAX8901A) 32-step, 1-wire serial dimming (max8901b) ? input undervoltage lockout ? input overvoltage lockout ? wled overvoltage protection (25v typ) ? 0.01a (typ) shutdown current ? no wled current in shutdown ? internal soft-start and thermal shutdown MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package ________________________________________________________________ maxim integrated products 1 ordering information MAX8901A in comp gnd on lx ovp pgnd cs output up to 25v 4 1 5 8 2 ep 3 7 6 input 2.6v to 5.5v pwm dimming control typical operating circuits 19-0865; rev 0; 8/07 note: all devices are specified over the -40? to +85? operating temperature range. + denotes a lead-free package. * ep = exposed paddle. t = tape and reel. for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim's website at www.maxim-ic.com. evaluation kit available part pin-package pkg code top mark MAX8901A eta+t 8 tdfn-ep* 2mm x 2mm t822-1 +aba max8901b eta+t 8 tdfn-ep* 2mm x 2mm t822-1 +abb max8901b in comp gnd on lx ovp pgnd cs output up to 25v 4 1 5 8 2 ep 3 7 6 input 2.6v to 5.5v serial-pulse dimming control pin configuration appears at end of data sheet.
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v in = v on = v ovp = 3.6v, v pgnd = v gnd = 0v, comp, cs, and lx are unconnected, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) 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. in to gnd .................................................................-0.3v to +7v cs, comp, on to gnd ...............................-0.3v to (v in + 0.3v) ovp, lx to gnd .....................................................-0.3v to +28v pgnd to gnd .......................................................-0.3v to +0.3v lx current ..................................................................770ma rms continuous power dissipation (multilayer board at +70?) 8-pin, 2mm x 2mm tdfn (derate above +70? by 11.9mw/?) ..........................953mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units input voltage v in 2.6 5.5 v v in rising 2.25 2.50 input undervoltage lockout threshold v in_uvlo v in falling 2.20 2.53 v v in rising 6.2 6.3 input overvoltage lockout threshold v in_ovlo v in falling 6.0 6.3 v t a = +25 c 0.01 1 shutdown input current i shdn v on = 0v t a = +85 c 0.1 ? MAX8901A 70 135 quiescent current i q v cs = 0.55v, no load (not switching) max8901b 115 185 ? output voltage range v out v diode = external boost diode voltage drop v in - v diode v ov v ovp overvoltage protection threshold v ov 6 leds with 25v ovp option 24 25 26 v ovp input current i ov v ovp = 20v 20 ? cs regulation voltage v cs no dimming 0.475 0.50 0.525 v on shutdown delay t shdn time v on is below low threshold until shutdown (figure 1) 1.18 1.33 1.50 ms on high voltage v on_hi 2.6v < v in < 5.5v 1.3 v on low voltage v on_lo 2.6v < v in < 5.5v 0.4 v t a = +25 c 0.01 1 on input current i on on = in t a = +85 c 0.1 ? initial on high pulse width t hi_init first on high pulse to enable ic (max8901b) (figure 1) 40 ? on high pulse width t hi max8901b (figure 1) 0.5 ? on low pulse width t lo max8901b (figure 1) 0.5 500.0 ?
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package _______________________________________________________________________________________ 3 note 1: specifications to -40? are guaranteed by design and characterization and are not production tested. parameter symbol conditions min typ max units t a = +25 c-1 +1% serial dimming full-scale led current accuracy i led = 24.75ma (max8901b) t a = -40 c to +85 c-3 +3 % pwm frequency for pwm dimming control f pwm MAX8901A 100 khz cs to comp transconductance 40 60 80 ? soft-start interval t soft- start c comp = 0.022? (figure 1) 10 ms thermal shutdown 160 c oscillator operating frequency f sw 700 750 800 khz maximum duty cycle d max v cs = 0.4v 90 92 % n-channel switch t a = +25 c 0.1 5 lx leakage current i lxlkg v lx = 27v t a = +85 c 0.1 ? n-channel switch on-resistance r lx 0.7 1.4 n-channel current limit i lim 0.63 0.70 0.77 a electrical characteristics (continued) (v in = v on = v ovp = 3.6v, v pgnd = v gnd = 0v, comp, cs, and lx are unconnected, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) 1 0 2 3 4 5 28 29 30 31 32 shutdown t shdn 1.33ms (typ) 2/33 1/33 3/33 4/33 5/33 6/33 28/33 29/33 30/33 31/33 32/33 32/33 shutdown full full i led_ t soft-start t hi_init t lo t hi > 40 s > 500ns 500ns to 500 s step 33 on figure 1. max8901b timing diagram
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package 4 _______________________________________________________________________________________ typical operating characteristics (circuit of figure 5, i led = 24.75ma, v in = v on = 3.6v, c1 = 1?, c2 = 1?, t a = +25?, unless otherwise noted.) 90 85 80 75 70 24 356 led efficiency vs. input voltage MAX8901A/b toc01 input voltage (v) efficiency (%) 4 wleds 6 wleds 3 wleds inductor: toko 1069as-220m diode: central semi cmdsh05-4 90 85 80 75 70 24 356 led efficiency vs. input voltage MAX8901A/b toc02 input voltage (v) efficiency (%) 4 wleds 6 wleds 3 wleds inductor: toko 1098as-100m diode: nxp pmeg3005eb 50 55 60 65 70 75 80 85 90 0 5 10 15 20 25 led efficiency vs. led current (6 wleds) MAX8901A/b toc03 led current (ma) efficiency (%) v in = 5v v in = 5.5v v in = 3.6v v in = 4.2v v in = 3v inductor: toko 1069as-220m diode: central semi cmdsh05-4 50 55 60 65 70 75 80 85 90 0 5 10 15 20 25 led efficiency vs. led current (6 wleds) MAX8901A/b toc04 led current (ma) efficiency (%) v in = 5v v in = 5.5v v in = 3.6v v in = 4.2v v in = 3v inductor: toko 1098as-100m diode: nxp pmeg3005eb 50 55 60 65 70 75 80 85 90 0 5 10 15 20 25 led efficiency vs. led current (4 wleds) MAX8901A/b toc05 led current (ma) efficiency (%) v in = 5v v in = 5.5v v in = 3.6v v in = 4.2v v in = 3v inductor: toko 1069as-220m diode: central semi cmdsh05-4 50 55 60 65 70 75 80 85 90 0 5 10 15 20 25 led efficiency vs. led current (4 wleds) MAX8901A/b toc06 led current (ma) efficiency (%) v in = 5v v in = 5.5v v in = 3.6v v in = 4.2v v in = 3v inductor: toko 1098as-100m diode: nxp pmeg3005eb
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package _______________________________________________________________________________________ 5 typical operating characteristics (continued) (circuit of figure 5, i led = 24.75ma, v in = v on = 3.6v, c1 = 1?, c2 = 1?, t a = +25?, unless otherwise noted.) 70 75 85 80 90 95 led and boost efficiency vs. input voltage MAX8901A/b toc07 input voltage (v) efficiency (%) 24 356 boost led 6wleds, inductor: toko a915ay-220m, diode: central semi cmdsh05-4 0 100 200 300 400 500 600 700 800 234567 in current (i in ) vs. supply voltage MAX8901A/b toc08 supply voltage (v) i in ( a) max8901b MAX8901A 1 s/div switching waveforms 50mv/div ac-coupled MAX8901A/b toc9 0ma 10v/div 0v 100mv/div ac-coupled 100ma/div v i v lx v out i lx 20ms/div input overvoltage protection response MAX8901A/b toc10 0v 0ma 10v/div 1v/div (ac-coupled) 0v 20ma/div 20ma/div v in v out i leds v lx 6.4v 5.4v 10ms/div startup and shutdown response (MAX8901A) MAX8901A/b toc11 0ma 0ma 10v/div 2v/div 0v 0v 20ma/div 100ma/div v on v out i supply i leds c2 = 0.1 f 10ms/div startup and shutdown response (max8901b) MAX8901A/b toc12 0ma 0ma 10v/div 2v/div 0v 0v 20ma/div 100ma/div v on v out i supply i leds
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package 6 _______________________________________________________________________________________ typical operating characteristics (continued) (circuit of figure 5, i led = 24.75ma, v in = v on = 3.6v, c1 = 1?, c2 = 1?, t a = +25?, unless otherwise noted.) 499.4 499.8 499.6 500.2 500.0 500.8 500.6 500.4 501.0 010 5 1520253035 v cs vs. led current step (max8901b) MAX8901A/b toc16 led current step v cs (mv) i led = 0.75ma i led = 24.75ma 24.0 24.2 24.6 24.4 24.8 25.0 -40 10 -15 35 60 85 maximum led current vs. temperature (max8901b) MAX8901A/b toc17 temperature ( c) i led (ma) minimum led current vs. temperature (max8901b) MAX8901A/b toc18 temperature ( c) i led ( a) 60 35 10 -15 735 740 745 750 730 -40 85 4ms/div pwm dimming response (MAX8901A) MAX8901A/b toc13 0v 0v 0ma 2v/div 0v 20ma/div 20mv/div v on v in v cs v out i leds d = 10% d = 90% 50mv/div (ac-coupled) 500mv/div f on_pwm = 100khz, duty cycle change: 90% to 10%, c2 = 0.1 f 10ms/div serial pulse dimming response (max8901b) MAX8901A/b toc14 0v 0v 0ma 2v/div 0v 20ma/div 20mv/div v on v in v cs v out i leds 50mv/div (ac-coupled) 1v/div 0 10 5 20 15 25 30 040 20 60 80 100 led current vs. pwm dimming (MAX8901A) MAX8901A/b toc15 pwm duty cycle (%) i led (ma) r cs = 20 , f pwm = 100khz
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package _______________________________________________________________________________________ 7 pin description pin name function 1 ovp wled overvoltage protection input. ovp monitors voltage at the wleds. connect ovp to the positive terminal of the output capacitor. if an ovp condition is detected, the max8901_ latches off. cycle v in or toggle v on to restart the ic. 2on enable and dimming control input. drive on high to enable the ic. drive on low for greater than 1.33ms (typ) to shutdown the wled current regulator. for the MAX8901A: after v in is above v uvlo and on is driven high, the MAX8901A enters soft-start and increases the wled current to full brightness. apply a minimum 30khz (500khz max) pwm signal to on to adjust the wled brightness from 100% to off, proportional to the duty cycle of the pwm signal. see the pwm dimming control (MAX8901A) section for more details . for the max8901b: after on is driven high for 40? (min), the max8901b enters soft-start and increases the wled current to full brightness. subsequent pulses on on cause the max8901b wled current to decrease in 32 equal steps. see the serial-pulse dimming control (max8901b) section for more details . 3in power supply input. bypass in to gnd with a 1? ceramic capacitor placed as close as possible to the ic. if v in exceeds the input overvoltage lockout threshold (6.5v max, v in rising), the ic stops switching and no wled current flows (if the forward voltage of the wled string is greater than v in ). when v in falls below the overvoltage lockout hysteresis level (6.0v min, v in falling), soft-start is initiated and normal operation resumes . 4 lx boost inductor node. connect an inductor between in and lx. lx is high impedance in shutdown. 5 pgnd power ground. connect to gnd and the exposed paddle (ep) with a short, wide trace. 6 gnd analog ground. connect gnd to the exposed paddle with a short, wide trace. 7 comp wled boost compensation node. connect a 0.022? ceramic capacitor from comp to gnd. c comp stabilizes the converter and sets the soft-start time. comp discharges to gnd when in shutdown. 8cs wled current sense input. for the MAX8901A, connect a current-sense resistor from cs to gnd. voltage sensed at cs regulates the wled current. for the max8901b, do not connect a sense resistor from cs to gnd. the max8901b provides an internal current source from cs to gnd to program the wled current. the max8901b regulates v cs to 0.5v (typ) for all i led. the MAX8901A regulates v cs to 0.5v (typ) for maximum duty cycle only. ?p exposed metal paddle. connect ep to gnd. for good thermal dissipation, the exposed paddle must be connected to a large ground plane.
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package 8 _______________________________________________________________________________________ detailed description the high efficiency and tiny size of the MAX8901A/ max8901b wled step-up converters make them ideally suited for driving lcd backlighting in cell phones, pdas, and other portable and handheld devices. the max8901_ drive from 2 to 6 series-connected wleds with constant current for uniform wled intensity and are optimized for the highest possible efficiency (up to 91%) over the full 1-cell li+/li-poly battery range. these tiny 2mm x 2mm devices operate at a constant 750khz switching frequency, and use small external components to achieve minimal input and output ripple while occupy- ing the smallest possible footprint. these converters use a single input (on) to enable the ic and to control wled intensity. the MAX8901A requires a direct pwm input to modulate wled intensity, with wled current proportional to the pwm duty cycle. the max8901b uses single-wire, serial-pulse dimming that reduces the wled intensity in 32 equal steps. full-scale wled current for serial-pulse dimming is 24.75ma. thermal shutdown boost control logic ic power ref pwm gnd internal 750khz osc shutdown timer MAX8901A in lx pgnd d*0.5v gm ovp cs comp on ep figure 2. MAX8901A block diagram
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package _______________________________________________________________________________________ 9 the max8901_ features: internal soft-start that gradually illuminates the wleds to eliminate inrush current during startup. input overvoltage protection (6.5v max) that prevents ic switching when exceeded. wled overvoltage protection (25v typ) that latches off the ic. shutdown mode that reduces current to 0.01? (typ). no wled current is present in shutdown or during an overvoltage condition if the wled forward voltage is greater than the input supply voltage. figures 2 and 3 show the block diagrams for the MAX8901A and max8901b, respectively. input overvoltage lockout when v in exceeds 6.2v (min), input overvoltage lockout (ovlo) is engaged to protect the max8901_ from high-input voltage conditions. once input ovlo occurs, the max8901_ stops switching and no wled current flows, provided the forward voltage of the wled string is greater than v in . when v in falls below 6v (min), the input ovlo condition is cleared, and the ic is enabled and enters soft-start. wled overvoltage protection wled overvoltage protection (ovp) occurs when the wled output voltage rises above the wled ovp threshold. the wled ovp protection circuitry latches off the ic and the ic enters shutdown when the wled ovp threshold is exceeded. after ovp is engaged, cycle v in or toggle on to reenable the ic and enter soft-start. thermal shutdown boost control logic ic power ref gnd internal 750khz osc shutdown timer max8901b in lx pgnd 0.5v gm ovp cs comp on pulse dimming ep figure 3. max8901b block diagram
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package 10 ______________________________________________________________________________________ startup and soft-start the max8901_ use a single input (on) to enable the ic and to control wled intensity. after on is driven high, the max8901_ enter soft-start and gradually increase the wled current to full brightness. when the max8901_ is first turned on, c comp is charged to 1.25v with a 60? current source. when v comp rises above 1.25v, c comp is charged with a 4? current source, and the internal mosfet begins switching at a reduced duty cycle. when v comp rises above 2.25v, the duty cycle is at its maximum. the v comp where the ic exits soft-start depends on the final duty cycle required by the load. typical shutdown timing characteristics are shown in the typical operating characteristics section. a pwm signal (MAX8901A) or serial pulses (max8901b) are applied to dim the wleds. see the pwm dimming control (MAX8901A) and serial-pulse dimming control (max8901b) sections for more details. shutdown the max8901_ enter shutdown when v on is held low for more than 1.33ms (typ), or when an output overvolt- age condition is engaged. in shutdown, the supply cur- rent is reduced to 0.01? (typ) by powering down the entire ic except for the on voltage-detection circuitry. c comp is discharged to gnd during shutdown, allowing the device to reinitiate soft-start when it is re-enabled. although the internal n-channel mosfet does not switch in shutdown, there is still a dc current path between the input and the wleds through the inductor and schottky diode. in shutdown, the minimum forward voltage of the wled string must exceed the maximum input voltage to ensure that the wleds remain off. typically, with two or more wleds, the for- ward voltage is large enough to keep leakage current low, less than 1? (typ). shutdown timing characteris- tics are shown in the typical operating characteristics . thermal shutdown the max8901 includes a thermal shutdown feature that protects the ic by turning it off when the die temperature reaches +160? (typ). after thermal shutdown occurs, the max8901_ must be restarted by toggling the on pin low, then high, or by cycling the input voltage. pwm dimming control (MAX8901A) after v in is above uvlo, apply a pwm signal to on for a wled current that is proportional to the pwm signal? duty cycle (0% duty cycle corresponds to zero led current and 100% duty cycle corresponds to full led current). restrict pwm frequency to between 30khz to 500khz for a maximum i led current accuracy. if dim- ming control is not required, on works as a simple on/off control. drive on high to enable the ic, or drive on low for shutdown. a resistor connected from cs to gnd pro- grams maximum i led . see the current-sense resistor (MAX8901A only) section for more details. serial-pulse dimming control (max8901b) after the max8901b is enabled by driving on high for the minimum initial on high pulse width (40?, min), soft-start is engaged and brings wled current to maxi- mum brightness. after soft-start is completed, dim the max8901b by pulsing on low (500ns to 500? pulse width). each pulse reduces the wled current by 0.75ma. the maximum wled current is 24.75ma for the max8901b (0.75ma/step). the overall dimming range for serial-pulse dimming control is from maximum wled current down to 1/33 of maximum wled current. the wleds are turned off by holding on low for at least 1.33ms (typ). see figure 1 for the serial-pulse dimming control timing diagram. applications information inductor selection recommended inductor values range from 10? to 47?. a 22? inductor optimizes the efficiency for most applications while maintaining low input voltage ripple. with input voltages near 5v, a larger value of inductance may be more efficient. to prevent core saturation, ensure that the inductor saturation current rating exceeds the peak inductor current for the application. calculate the peak inductor current with the following formula: where i led(max) is in ma and l is in ?. i v v v x l peak out(max) in(min) in(min) x .2 = + i x led max () 900 2 1
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package ______________________________________________________________________________________ 11 schottky diode selection the high switching frequency of the max8901_ demands a high-speed rectification diode for optimum efficiency. a schottky diode is recommended due to its fast recovery time and low forward voltage drop. ensure that the diode? average and peak current rating exceeds the average output current and peak inductor current. in addition, the diode? reverse breakdown voltage must exceed v out . the rms diode current can be approximated from the following equation: capacitor selection ceramic capacitors with x5r, x7r, or better dielectric are recommended for stable operation over the entire operating temperature range. the exact values of input (c1) and output (c2) capacitors are not critical (see figures 4 and 5). the typical value for the input capacitor is 1?, and the typical value for the output capacitor is 0.1? (MAX8901A) or 1? (max8901b). higher value capacitors can reduce input and output ripple, but at the expense of size and higher cost. the compensation capacitor (c3) stabilizes the converter and controls soft-start. the compensation capacitor is typically chosen to be 0.022? for most applications. current-sense resistor (MAX8901A only) the MAX8901A uses a sense resistor (r cs ) connected from cs to gnd to program the maximum wled cur- rent for 100% pwm duty cycle. the MAX8901A regu- lates v cs to 0.5v (typ) for 100% duty cycle. calculate r cs (in ohms) using the following equation: where i led(max) is the maximum wled current in milliamps. maximum wled current is programmed to 25ma using a 20 resistor. pcb layout due to fast switching waveforms and high-current paths, careful attention is required when the pcb layout is designed. minimize trace lengths between the ic and the inductor, the diode, the input capacitor, and the output capacitor. for the MAX8901A, minimize the trace length between the ic and r cs . keep traces short, direct, and wide. keep noisy traces, such as the lx node trace, away from cs. the input bypass capacitor (c in ) should be placed as close as possible to the ic. the ground connections of c in and c out should be as close together as possible. pgnd and gnd should be connected together at the input capacitor ground terminal. refer to the max8901 ev kit for an example layout. r cs led(max) 500 i = i diode rms () = ii led peak
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package 12 ______________________________________________________________________________________ MAX8901A in comp gnd on lx ovp pgnd cs output up to 25v d2?7 r1 (r cs ) 20 c2 0.1 f d1 4 1 5 8 2 ep l1 22 h 3 7 6 c3 0.022 f c1 1 f input 2.6v to 5.5v pwm dimming control figure 4. MAX8901A application circuit max8901b in comp gnd on lx ovp pgnd cs output up to 25v c2 1 f d1 4 1 5 8 2 l1 22 h 3 7 6 c3 0.022 f input 2.6v to 5.5v serial-pulse dimming control r1 0 c1 1 f ep figure 5. max8901b application circuit
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package ______________________________________________________________________________________ 13 1 + 34 865 cs pgnd max8901 2 7 comp ovp in lx on tdfn-ep (2mm 2mm) gnd *ep *exposed pad top view pin configuration chip information process: bicmos
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package 14 ______________________________________________________________________________________ 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 .) package outline 21-0168 2 1 d 6 & 8l tdfn exposed pad, 2x2x0.80mm 8l tdfn exposed pads.eps
MAX8901A/max8901b highest efficiency supply for 2 to 6 series wleds in a 2mm x 2mm tdfn package 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 ____________________ 15 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. package information (continued) (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 .) symbol common dimensions 2.10 1.90 0.80 max. 0.70 min. 0.20 ref. 0.40 0.05 2.10 0.20 0.00 1.90 d a l a1 e a2 k 1.600.10 1.30 ref [(n/2)-1] x e 0.300.05 b 0.65 typ. e package variations pkg. code 0.900.10 e2 d2 6 n t622-1 0.25 min. package outline 21-0168 2 2 d 6 & 8l tdfn exposed pad, 2x2x0.80mm 1.300.10 1.50 ref 0.250.05 0.50 typ. 0.700.10 8 t822-1 0.150 r 0.125 1.200.10 1.50 ref 0.250.05 0.50 typ. 0.800.10 8 t822-2 0.125

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