LDS8681

© 2009 IXYS Corp.

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Doc. No. 8681_DS, Rev. N1.0

Characteristics subject to change without notice

800 mA, Dual Output LED Flash/PWM Dimming Lamp Driver

FEATURES

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1-x and 2-x Charge Pump modes

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Supply voltage range from 2.7 to 5.5 V

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Low dropout PowerLite

™ Current Regulator*

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Drives up to 2 LEDs at 400 mA

simultaneously or one LED at 800 mA

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Power efficiency up to 90%

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Low current shutdown mode < 1 µA

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Short circuit current limiting

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Thermal shutdown protection

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Available 8-pin 2 x 3 x 0.8 mm 8-pin TDFN

package

APPLICATION

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White LED photoflash for digital cameras,

cell phones, Smart Phones, and other

portable devices

DESCRIPTION

The LDS8681 is a high efficiency regulated charge

pump with low dropout voltage that can drive two

LEDs at 400 mA each simultaneously or one LED at

800 mA. Low dropout PowerLite

™ Current Regulator

(PCR) increases device’s efficiency up to 90%.

The EN logic input functions as a chip enable.

The LEDs current is programmed at 400 mA for both

channels in the factory. Please, consult factory about

other current values. Each LED current can be

programmed separately in the factory from 52 to

800 mA in 25 mA steps for LEDA and in the range

from 52 to 400 mA for LEDB

The regulated charge pump supports a wide input

voltage range from 2.7 V to 5.5 V.

The device is available in 8-lead TDFN 2 mm x 3 mm

package with a max height of 0.8 mm.

TYPICAL APPLICATION CIRCUIT