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MAX1707

Light-Management IC with Efficient 1x/1.5x/2x Charge Pump for Backlight/Flash/RGB LEDs

Maxim Integrated 

19-3744; Rev 0; 7/05

EVALUATION KIT

AVAILABLE

Light-Management IC with Efficient 1x/1.5x/2x

Charge Pump for Backlight/Flash/RGB LEDs

General Description

The MAX1707 provides complete light management for

main display backlight, subdisplay backlight (or RGB

indicator), and white LED camera flash with regulated

constant current up to 610mA total. By utilizing adap-

tive 1x/1.5x/2x charge-pump modes and very-low-

dropout current regulators, it achieves high efficiency

over the full 1-cell Li+ battery input voltage range. The

1MHz fixed-frequency switching allows for tiny external

components while the regulation scheme is optimized

to ensure low EMI and low input ripple. An integrated

derating function protects the LEDs from overheating

during high ambient temperatures.

The MAX1707 features an internally trimmed reference

to set the maximum LED current. An I2C serial port is

used for on/off control and setting the LED currents in

32 linear steps. When using the RGB indicator, the I2C

port provides 32k colors and programmable ramp-

up/down rates. The camera flash may be turned on/off

by the I2C port or a separate digital logic input.

Applications

Cell Phones and Smartphones

PDAs, Digital Cameras, Camcorders

Displays with Up to 11 LEDs

Features

♦ Guaranteed 610mA Continuous Drive Capability

4 LEDs at 30mA Each for Main Display

3 LEDs at 30mA Each for Sub or RGB

400mA Total for Flash

♦ 2-Wire I2C Serial Port

5-Bit (32-Step) Linear Dimming

32k Colors

Ramp-Up/Down Rates

♦ 92% Peak/83% Avg Efficiency (PLED/PBATT)

♦ Adaptive 1x/1.5x/2x Mode Switchover

♦ 0.3% (typ) LED Current Accuracy and Matching

♦ Low Input Ripple and EMI

♦ Low 0.1µA Shutdown Current

♦ Output Overvoltage Protection

♦ Thermal Derating Function Protects LEDs

♦ 24-Pin 4mm x 4mm Thin QFN Package

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

MAX1707ETG

-40°C to +85°C

24 Thin QFN

4mm x 4mm

PKG

CODE

T2444-4

Pin Configuration appears at end of data sheet.

Typical Operating Circuit

INPUT

2.7V TO 5.5V

4.7μF

VLOGIC

0.1μF

I2C PORT

ON/OFF AND

BRIGHTNESS

STROBE

ON/OFF

1μF

1μF

C1P C1N

IN

PIN

C2P C2N

OUT

OUTPUT

UP TO 610mA

10μF

GND

M1

MAX1707

M2

VDD

M3

M4

S1

S2

SCK

S3

F1

SDA

F2

F3

STB

F4

PGND

MAIN

SUB OR RGB

FLASH

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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