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LDS8680
800 mA White LED Driver for Photo Flash
FEATURES
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1-x and 2-x Charge pump modes
Low dropout PowerLite ? Current Regulator*
Drives up to 2 LEDs at 400 mA
simultaneously or one LED at 800 mA
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Smart OneWire ? LED current programming
and PWM mode LED current control
channel. Inclusion of a low dropout PowerLite ?
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Power efficiency up to 90%
Low current shutdown mode < 1 μA
Current Regulator
efficiency up to 90%.
(PCR)
increases
device’s
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Short circuit current limiting
Thermal shutdown protection
Timeout to protect LED at high currents
8-pin 2 x 3 x 0.8 mm TDFN package
The EN/SET logic input functions as a chip enable
and a current setting interface.
The LEDs current is programmable by Smart
OneWire ? digital interface in 32 steps from 52 to
800 mA for LEDA channel or in 16 steps from 52 to
APPLICATION
400 mA for LEDB channel. Every LED may be turned
on/off or programmed separately
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Photo flash plus red eyes reduction
White LED photoflash for cell phones and
still cameras
Low noise input ripple is achieved by operating at a
constant switching frequency, which allows the use of
small external ceramic capacitors. The charge pump
DESCRIPTION
The LDS8680 is a high efficiency charge pump with
low dropout voltage that can drive two LEDs at 400
mA each simultaneously or one LED at 800 mA per
TYPICAL APPLICATION CIRCUIT
supports a range of input voltages 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.
? 2009 IXYS Corp.
Characteristics subject to change without notice
1
Doc. No. 8681_DS, Rev. N1.0
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