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03 07MEDIUM TO HIGH CURRENT (100mA TO 2A) LED DRIVERS FOR PHOTOFLASH/TORCH LIGHTING

Medium to High Current (100mA to 1A) LED Drivers for Photoflash/Torch Lighting

High current inductor-based switching LED drivers for camera photoflash, torch and video lighting feature various topologies including buck-boost and boost and provide tiny, efficient high power solutions for camera phone applications. LED Power Efficiency vs V

IN I
LED = 150mAI

Applications:

Power Management for LEDs - 23453 .

Cell Phone Camera Flash

LED = 1AT

.

Cell Phone Torch Lighting

.

758085 4.35.55.1706560

Digital Cameras

EFFICIENCY (%)

.

PDAs

.

A = 25 ° CEFFICIENCY = (V

Miscellaneous Li-Ion/Polymer-Based LED Driver Applications

OUT – V
LED )I
LED /V
IN I
IN 3.13.93.54.7 9095100 V
IN (V)2.7

LTC3454: 1A Synchronous Buck-Boost High Current LED Driver

L15µHI
IN 1-CELLLi-ion2.7V - 4.2V 10µF10µF
LED

LTC3454: Actual Size,Complete Solution

V
IN SW1SW2V
OUT LED EN2 EN1 I
LED LEDV 0 0 0 (SHUTDOWN) 0 1 150mA 1 0 850mA 1 1 1A LTC3454 EN2 (FLASH)EN1 (TORCH) V
C I
SET1 0.1µFR I
ISET1 GND (EXPOSED PAD)
SET2 20.5k1%R
ISET2 3.65k1%

Part NumberTopologyV

Q

(mA)I

SD

(µA)Package

IN

(V)V

OUT

(V)*Max. Total LED Current (mA)*Max. No. of White LEDsDimming ControlFrequency (MHz)I Medium to High Current (100mA to 1A) LED Drivers for PhotoFlash/Torch Lighting LTC3452Buck-Boost2.7 to 5.54.52004DC/PWM10.6<14x4 QFN-20LTC3490Boost1.0 to 3.243501DC/PWM1.31<503x3 DFN-8 SO-8LTC3453Buck-Boost2.7 to 5.54.55001DC/PWM12.5<64x4 QFN-16 LT1618Buck-Boost1.6 to 18345001DC/PWM1.41.8<1MSOP-10 LTC3454Buck-Boost2.7 to 5.55.151A1DC/PWM10.8<13x3 DFN-10

* Output voltage and current depend on the choice of external components 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 10 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 10 10/24/08 3:43:57 PM 10/24/08 3:43:57 PM