LDS8621

© 2009 IXYS Corp.

1

Doc. No. 8621DS, Rev. N1.0

Characteristics subject to change without notice

200 mA, Dual Output LED Flash/Lamp Driver

FEATURES

o

Multi-mode charge pump: 1x, 1.33x, 1.5x, 2x

o

Ultra low dropout PowerLite

™ Current

Regulator*

o

Drives two high-current LEDs up to 96 mA

each

o

PWM brightness control

o

Power efficiency up to 95%

o

Low noise input ripple in all modes

o

Low current shutdown mode

o

Soft start and current limiting

o

Short circuit protection

o

Thermal shutdown protection

o

Tiny 3 x 3 x 0.8 mm 16-pin TQFN package

APPLICATION

o

LED Light Supply for Smart Phones, PDAs,

and Cell Phones

o

LED Flashlights

o

LED Flash/Strobe Applications

DESCRIPTION

The

LDS8621

is

a

high

efficiency multi-mode

fractional charge pump with ultra low feedback

voltage that can drive up to two high-current LEDs.

The inclusion of a 1.33x fractional charge pump

mode and ultra low dropout PowerLite

™ Current

Regulator increases device’s efficiency up to 95%.

New mode requires no additional external capacitors.

The PWM1/PWM2 logic inputs function as a chip

enable and a PWM mode LED brightness control.

PWM1 pin controls LED A, while PWM2 controls

bank LED B.

The maximum LEDs current value is factory preset to

96 mA. Other current values are available upon

request. Each LED may be programmed separately.

Low noise input ripple is achieved by operating at a

constant switching frequency which allows the use of

small

external

ceramic

capacitors.

The

multi-

fractional charge pump supports a wide range of

input voltages from 2.7V to 5.5V.

The device is available in in 16-lead TQFN 3mm x

3mm package with a max height of 0.8mm.

TYPICAL APPLICATION CIRCUIT