SC623AEVB datasheet(1/21 Pages) SEMTECH

Part #	SC623AEVB

Description	LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and I2C Interface

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Manufacturer	SEMTECH [Semtech Corporation]

Direct Link	http://www.semtech.com

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POWER MANAGEMENT

1

SC623A

LED Light Management Unit

Charge Pump, 4 LEDs, 400mA Flash LED,

and I2C Interface

Features

Input supply voltage range — 3.0V to 5.5V

Charge pump modes — 1x, 1.5x and 2x

Four programmable current sinks with 32 steps from

0.5mA to 25mA

Flash LED — 400mA max in flash mode, 250mA max

continuous for spotlight

Charge pump frequency — 250kHz

I2C compatible interface — up to 400kHz

Backlight current accuracy ±1.5% typical

Backlight current matching ±0.5% typical

Programmable fade-in/fade-out for main backlight

External flash control pin to sync with camera

Optional 1s flash time out

Automatic sleep mode (LEDs off ) — I

Q

= 100μA

Low shutdown current — 0.1μA (typical)

Ultra-thin package — 3mm x 3mm x 0.6mm

Fully WEEE and RoHS compliant

Applications

Cellular phone backlighting and flash

PDA backlighting and flash

Camera I/O and core power

Description

The SC623A is a high efficiency charge pump LED driver

using Semtech’s proprietary mAhXLifeTM technology.

Performance is optimized for use in single-cell Li-ion

battery applications.

The

charge

pump

provides

backlight

current

in

conjunction with four matched current sinks. It also can

supply continuous or bursted current to a flash LED using

the dedicated flash driver current sink.The load and supply

conditions determine whether the charge pump operates

in 1x, 1.5x, or 2x mode. An optional fading feature that

gradually adjusts the backlight current is provided to

simplify control software. A flash-timeout feature disables

the flash if active for longer than 1 second.

The SC623A uses an I2C compatible serial interface. The

interface controls all functions of the device, including

backlight and flash currents. The flash/spotlight output is

triggered via either the I2C interface or a dedicated pin.

In sleep mode, the device reduces quiescent current to

100

μA while continuing to monitor the serial interface.

Total current reduces to 0.1μA in shutdown.

SC623A

VIN

SDA

FLEN

AGND

PGND

VOUT

BL 1

BL 2

BL 3

FL

BL 4

FLASH

CIN

2.2μF

MAIN BACKLIGHT

1

C + C1- C2+ C2-

I2C Data

Flash Control

Enable Control

I2C Clock

SCL

EN

VBAT

C1

2.2μF

C2

2.2μF

COUT

4.7μF

US Patents: 6,504,422; 6,794,926

Typical Application Circuit

June 27, 2007

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