preliminary datasheet lp3361 lp3361 C ver. 1.0 datasheet nov.-2008 page 1 of 6 6-channel constant current white led driver general description the lp3361 is a low-dropout bias supply for white leds is a high-performance alternative to the simple ballast resistors used in conventional white led designs. it supports 6 white leds with regulated constant current for uniform intensity. the lp3361 maintains low dropout current regulators. the lp3361 requires a 45mv dropout at a 20ma load on each output to match the led brightness. the brightness of leds can be tuned through a pulse width modulated signal at the pwm pin,the pwm frequency from 200hz to 10khz and the duty from 0 to 100%. the lp3361 is available in a tdfn-10 package. order information lp3361 - f: pb-free package type qv:tdfn-10 applications ? lcd panel ? cellular and smart mobile phone ? pda/dsc ? pmp features ? 2.7v to 6v input voltage ? 20ma maxim sink current ? dual panel driver of wled ? pwm tuned led brightness through en pin ? soft start function ? built-in thermal protection ? i q <1ua in shutdown ? tdfn-10 package ? rohs compliant and 100% lead (pb)-free typical application circuit sub_panel 2.2uf on/off lp3361 11 2 3 1 8 7 4 6 5 9 10 gnd en1 vdd1 led1 vdd2 en2 led2 led4 led3 led5 led6 main_panel vbat vbat marking information please see website.
preliminary datasheet lp3361 lp3361 C ver. 1.0 datasheet nov.-2008 page 2 of 6 application information key pad_ctrl main_panel on/off lp3361 11 2 3 1 8 7 4 6 5 9 10 gnd en1 vdd1 led1 vdd2 en2 led2 led4 led3 led5 led6 lp3361 11 2 3 1 8 7 4 6 5 9 10 gnd en1 vdd1 led1 vdd2 en2 led2 led4 led3 led5 led6 sub_panel lp3361 driver panel and keypad wled application vbat vbat 2.2uf vbat on/off off vbat 2.2uf flash led on/off lp3361 driver 5pcs white-led application 2.2uf 2.2uf lp3361 11 2 3 1 8 7 4 6 5 9 10 gnd en1 vdd1 led1 vdd2 en2 led2 led4 led3 led5 led6 nc lp3361 driver 4pcs white-led application nc lp3361 driver flash white-led application vbat 22uf nc en1 en2 iled 0 0 0ma 0 1 40ma 1 0 80ma 1 1 120ma lp3361 driver 6pcs white-led application on 2.2uf sub_ctrl vbat off vbat on 4pcs led lp3361 11 2 3 1 8 7 4 6 5 9 10 gnd en1 vdd1 led1 vdd2 en2 led2 led4 led3 led5 led6 main_panel backlight_ctrl nc vbat lp3361 driver dual panel application mai n _c tr l vbat vbat vbat on/off nc vbat lp3361 11 2 3 1 8 7 4 6 5 9 10 gnd en1 vdd1 led1 vdd2 en2 led2 led4 led3 led5 led6 lp3361 11 2 3 1 8 7 4 6 5 9 10 gnd en1 vdd1 led1 vdd2 en2 led2 led4 led3 led5 led6 5pcs led 6pcs led keypad_led
preliminary datasheet lp3361 lp3361 C ver. 1.0 datasheet nov.-2008 page 3 of 6 functional pin description package type pin configurations tdfn-10 11 11 8 led4 4 2 5 5 10 gnd 3 1 gnd 9 vdd1 7 led1 led3 led5 6 en1 led2 vdd2 en2 led6 pin name description 1 led1 led1 cathode terminal. 20ma current flows into led. floating is used to disable. 2 en1 device enable1 (active high).control from led1 to led4 and used a pwm dimming brightness. 3 vdd1 led1~led4 power supply. 4 led2 led2 cathode terminal. 20ma current flows into led. floating is used to disable. 5 led3 led3 cathode terminal. 20ma current flows into led. floating is used to disable. 6 led4 led4 cathode terminal. 20ma current flows into led. floating is used to disable. 7 en2 device enable2 (active high).control from led5 to led6 and used a pwm dimming brightness. 8 vdd2 led5,led6 power supply. 9 led5 led2 cathode terminal. 20ma current flows into led. floating is used to disable. 10 led6 led2 cathode terminal. 20ma current flows into led. floating is used to disable. 11 gnd gound.
preliminary datasheet lp3361 lp3361 C ver. 1.0 datasheet nov.-2008 page 4 of 6 absolute maximum ratings ? input voltage to gnd (vdd1 , vdd2 ) ---------------------------------------------------------------------- 6.5v ? en to gnd voltage (v en ) ---------------------------------------------------------------------- -0.3v to v in +0.3v ? operating junction temperature range (t j ) -------------------------------------------------- -4 0 to 125 ? maximum soldering temperature (at leads, 1 0sec) ----------------------------------------------------- 300 thermal information ? maximum power dissipation (p d ) dfn-10 ---------------------------------------------------------------- 1.5w ? thermal resistance (ja) ------------------------------------------------------------------------------------ 58 /w electrical characteristics (over recommended operating conditions unless specified otherwise) v ina =3.6v,en=high, t a =25 ) symbol parameter conditions lp3361 unit min. typ. max. v in input voltage 3 5.5 v i q quiescent current n o load, 75 75 ua i shdn shutdown current en = gnd 0.1 1 a i led-err led current accuracy 3ma< i led< 30ma 19.4 20 20.6 ma i led-led-err led channel matching any two channel mismatch -3 3 % v en(l) enable threshold low 0.5 v v en(h) enable threshold high 2 v
preliminary datasheet lp3361 lp3361 C ver. 1.0 datasheet nov.-2008 page 5 of 6 typical operating characteristics
preliminary datasheet lp3361 lp3361 C ver. 1.0 datasheet nov.-2008 page 6 of 6 packaging information
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