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features applications description packages. support up to 4 leds led sink current 20ma low dropout voltage low quiescent supply current:270ua(typ) no noise and emi shutdown current less than 1ua over temperature protection 16-step brightness control small package: qfn3x3-16l,msop-8l sot23-8l, dfn2x2-8l pb-free package mobile phone digital camera pda mp3 qfn3x3-16l,msop- 8l, the pam2811 provides 4 regulated current sinks, capable of sinking up to 20ma current to accommodate 4 white leds. it requires no charge pump, has no noise and emi, and significantly improves the efficiency in li battery range. led brightness can be controlled by single-wire dimming techniques. the constant current sink is set by16-step. the pam2811 is available in sot23-8l and dfn2x2-8l typical application 1 www.poweranalog.com 03/2010 rev1.0 , power analog microelectronics inc pam2811 4-channel single-wire dimming led drive with ultra low dropout current sink pam2 811 vi n en led 4 led 3 led 2 led 1 gn d 1uf vin pulse input ss 12 n16 pgnd
block diagram 2 , power analog microelectronics inc www.poweranalog.com led1 led2 led3 led4 vin current sinks pgnd en current setting reference agnd 1 2 3 4 5 6 2 3 4 5 14 15 16 1 en iled level 30us 3 www.poweranalog.com , power analog microelectronics inc pin configuration & marking information y: year w: week x: internal code top view qfn3x3-16l 12 11 10 9 13 14 15 16 1 2 3 4 8 7 6 5 nc nc nc nc led2 led3 nc led4 agnd vin pgnd en nc nc led1 nc p2811a xxxyw 12 11 10 9 13 14 15 16 1 2 3 4 8 7 6 5 nc nc en nc gnd nc nc nc nc vin nc led1 led2 led4 led3 p2811b xxxyw vin pam2811 4-channel single-wire dimming led drive with ultra low dropout current sink msop-8l 1 2 3 4 5 6 7 8 p2811c xxxyw pgnd en vin agnd led4 led3 led2 led1 sot23-8 eaxyw 1 2 3 4 5 6 7 8 vin gnd nc en led1 led2 led3 led4 dfn 2x2-8 led1 led2 led3 led4 1 2 3 4 8 7 6 5 pgnd agnd en vin p2811e xxxyw 03/2010 rev1.0
4 www.poweranalog.com , power analog microelectronics inc pin description pam2811 4-channel single-wire dimming led drive with ultra low dropout current sink p2811a p2811b p2811c p2811d p2811e symbol function 12---nc 23-2-nc 34---nc 45---nc 5 4 3 4 agnd analog ground 6 12 1 1 pgnd power ground 6 1 vin supply input 7 7 33 vin supply input 8 1 242en enable pin. active high, with an internal 150k pull-down resistor. 98---nc 10 13 8 8 5 led4 led4 pin, connect to the led cathode, leave it to connect gnd or open if unused 11 1 4 7 7 6 l e d 3 led3 pin, connect to the led cathode, leave it to connect gnd or open if unused 12 15 6 6 7 led2 led2 pin, connect to the led cathode, leave it to connect gnd or open if unused 13 16 5 5 8 led1 led1 pin, connect to the led cathode, leave it to connect gnd or open if unused 14 9 - - - nc 15 10 - - - nc 16 11 - - - nc 03/2010 rev1.0
5 thermal information parameter package symbol maximum unit qfn 3x3-16l 35 msop-8l 180 sot23-8 250 thermal resistance (junction to ambient) dfn2x2-8l ja 80 c/w qfn 3x3-16l 14 msop-8l 75 sot23-8 130 thermal resistance (junction to case) dfn2x2-8l jc 20 c/w , power analog microelectronics inc www.poweranalog.com absolute maximum ratings these are stress ratings only and functional operation is not implied exposure to absolute maximum ratings for prolonged time periods may affect device reliability all voltages are with respect to ground . . . input voltage range............................-0.3v to 6v pwm pin voltage................. storage temperature.....................-65 to 150 soldering temperature....................... -0.3v to (v +0.3v)/6v maximum junction temperature..................150c c c 300c,5sec in recommended operating conditions input voltage range.......................... ambient temperature range............-40 to 85 2.7v to 5.5v junction temperature range..........-40c to 125c c c electrical characteristic t =25 , v =3.6v, unless otherwise noted. ain c parameter symbol conditions min typ max units input voltage v in 2.7 5.5 v output current i led all leds 100% setting 18 20 22 ma current matching all leds 100% setting -3 +3 % le d dropout voltage v do i led =20ma 60 mv quiescent current i q i led =0 270 a shutdown current i sd v en =0v, vin=5.5v 0.1 1 a startup time t on 30 s en input logic high v hi 1.5 v en input logic low v lo 0.4 v en low time for dimming t lo 0.5 500 s en high time for dimming t hi 0.5 s shutdown delay time t off v en =0v 1000 2000 s thermal shutdown temperature t p 150 hysteresis temperature 30 pam2811 4-channel single-wire dimming led drive with ultra low dropout current sink 03/2010 rev1.0
6 , power analog microelectronics inc www.poweranalog.com typical performance characteristics v =5.0v,t =25c, unless otherwise noted. in a pam2811 4-channel single-wire dimming led drive with ultra low dropout current sink led current vs led pin voltage led current vs input voltage efficiency vs input voltage led current vs en steps 0 5 10 15 20 25 22.533.544.555.5 input voltage(v) led current(ma) 0 5 10 15 20 25 0 0.2 0.4 0.6 0.8 1 led pin voltage(v) led current(ma) 0 5 10 15 20 25 12345678910111213141516 en st e p s led current(ma) 0 10 20 30 40 50 60 70 80 90 100 2.533.544.555.5 input voltage(v) efficiency(%) 03/2010 rev1.0
7 , power analog microelectronics inc www.poweranalog.com application information the pam2811 is a 4-channel programmable white-led driver. it is capable of supplying 20ma per channel with a total of 80ma output current available. led brightness control of pam2811 can be achieved with a pulses signal. the en input is used to enable or disable the pam2811. pulling the en pin higher than 1.5v will enable the device. for producing constant, non- pulsating output current compare to conventional pulse width modulation(pwm) dimming scheme. the pam2811 incorporates a 4-bit dac for brightness control to program the output current at 16 continuous steps:20~1.25ma. table1 shows details for current setting. table 1 current setting page2 shows the detail operation of 16-steps brightness control. when single-wire pulse counting dimming is used, the ready time is recommended to be greater than 30us for enabling the device, the pulse high time thi recommended to be greater than 0.5us, and the pulse low time t is recommended to be greater than0.5us and less than 500us. a constant current is sourced as long as the en signal remains high. the shutdown feature reduces quiescent current to less than 0.1ua. the pam2811 equips over temperature protection. when the junction temperature (t ) exceeds +150c, the current source turns off automatically. the device will turn on again after the ics enable input over temperature protection lo j t cools down under +120c. operating at absolute maximum temperature is not recommended. j led connection the pam2811 supports up to 4 white leds. the four leds are connected from vin to ledx respectively. if the led is not used, it should be connected to gnd or open. data current(ma) data current(ma) 16 20 8 10 15 18.75 7 8.75 14 17.5 6 7.5 13 16.25 5 6.25 12 15 4 5 11 13.75 3 3.75 10 12.5 2 2.5 9 11.25 1 1.25 pam2811 4-channel single-wire dimming led drive with ultra low dropout current sink 03/2010 rev1.0
ordering information 8 , power analog microelectronics inc www.poweranalog.com part number marking package type shipping package pam2811ajer p2811a xxxyw qfn3x3-16l 3,000units/tape&real pam2811bjer p2811b xxxyw qfn3x3-16l 3,000units/tape&real pam2811c scr p2811c xxxyw msop-8l 2,500units/tape&real pam2811dacr eaxyw sot23-8 3,000units/tape&real pam2811eycr p2811e xxxyw dfn2x2-8l 3,000units/tape&real pam2811xxxx shipping package number of pins package type pin configuration pam2811 4-channel single-wire dimming led drive with ultra low dropout current sink 03/2010 rev1.0
dimensions (millieters) min typ max a 0.70 0.75 0.80 a1 0.00 0.02 0.05 a2 0.20 b 0.18 0.25 0.30 d 2.90 3.00 3.10 d1 1.55 1.70 1.80 e 2.90 3.00 3.10 e1 1.55 1.70 1.80 e0.50bsc l 0.30 0.40 0.50 n16 aaa 0.08 bbb 0.10 3x3mmqfn16 outline dimensions 9 , power analog microelectronics inc www.poweranalog.com pam2811 4-channel single-wire dimming led drive with ultra low dropout current sink 03/2010 rev1.0
outline dimensions 10 , power analog microelectronics inc www.poweranalog.com pam2811 4-channel single-wire dimming led drive with ultra low dropout current sink millimeter ref min max a--1.10 a1 0.05 0.15 a2 0.78 0.94 b 0.22 0.38 c 0.08 0.23 d 2.90 3.10 e 2.90 3.10 e1 4.75 5.05 e0.65bsc l 0.40 0.70 msop-8 03/2010 rev1.0
11 , power analog microelectronics inc www.poweranalog.com pam2811 4-channel single-wire dimming led drive with ultra low dropout current sink outline dimensions sot23-8 (typ) (max) (ref.) (ref.) l1 ref.) ( 0.20 min max a 1.45 max a1 0 0.10 d 2.70 3.10 e 2.60 3.00 e1 1.40 1.80 e e1 0.33 (ref) b 0.22 0.38 c 0.12 (ref) l 0.30 0.60 0 10 symbol dimensions in millimet dimensions in millimet ers 0.65 (ref) a2 1.10 1.30 l1 0.60 (ref) dimensions in millimet dimensions in millimet ers symbol min max 03/2010 rev1.0
12 , power analog microelectronics inc www.poweranalog.com pam2811 4-channel single-wire dimming led drive with ultra low dropout current sink outline dimensions dfn 2x2 plane seating 008 . c 8 a b c 4 index area (/ /) d2xe2 (/ /) d2xe2 4 index area top view 9 side view bottom view pin 1 id # d e e nxb a1 a d2 e2 nxl nxk 8 050 . 2x2 body size lead pitch e ( ) count lead summary table r0 20 . pin 1 id # symbol min nom max a1 000 .002 .005 . a 070 .075 .080 . common dimension n8 040 . 030 . 020 . nom l max min e bsc min nom max b 030 . 025 . 018 . 200 . 200 . d bsc 130 . max nom d2 1 20 . 105 . min max nom e2 min 060 . 070 . 045 . unit: millimeters 03/2010 rev1.0

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