MAX8631XETI+T【PDF 1/15 页】IC LED DRVR WHITE BCKLGT 28-TQFN

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Sheet目录341

[1页]2页 3页 4页 5页

ATION

EVALU

AVAIL

19-3688; Rev 3; 6/08

KIT

ABLE

1x/1.5x/2x White LED Charge Pump with

Two LDOs in 4mm x 4mm Thin QFN

General Description

The MAX8631X/Y charge pump drives up to eight white

LEDs with regulated constant current for uniform inten-

sity. The main group of LEDs (M1–M4) can be driven

up to 30mA per LED for backlighting. The flash group

of LEDs (F1–F4) is independently controlled and can be

driven up to 100mA per LED (or 400mA total). Two

200mA LDOs are on-board to provide power for cam-

era functions. The LDOs’ output voltages are pin-pro-

grammable to meet different camera-module

requirements. By utilizing adaptive 1x/1.5x/2x charge-

pump modes and very-low-dropout current regulators,

the MAX8631X/Y achieves high efficiency over the full

1-cell lithium-battery voltage range. The 1MHz fixed-fre-

quency switching allows for tiny external components,

and the regulation scheme is optimized to ensure low

EMI and low input ripple.

The MAX8631X/Y is available in a 28-pin thin QFN,

4mm x 4mm lead-free package (0.8mm max height).

Applications

Camera Phones and Smartphones

Backlighting and Flash

PDAs, Digital Cameras, and Camcorders

Typical Operating Circuit

Features

? Powers Up to 8 LEDs

Up to 30mA/LED Drive for Backlight

Up to 400mA Total Drive for Flash

? Two Internal Low-Noise 200mA LDOs

? 94% Max/85% Avg Efficiency (P LED /P BATT ) over Li+

Battery Discharge

? 0.2% Typical LED Current Matching

? Adaptive 1x/1.5x/2x Mode Switchover

? Single-Wire Serial Pulse Interface for Brightness

Control (32 Steps)

? Thermal T A Derating Function

? Low Input Ripple and EMI

? 2.7V to 5.5V Supply Voltage Range

? Soft-Start, Overvoltage, and Thermal-Shutdown

Protection

? 28-Pin Thin QFN, 4mm x 4mm Package

Ordering Information

1 μ F

PART

TEMP RANGE

PIN-PACKAGE

INPUT

2.7V TO 5.5V

10 μ F

C1P

GND

PGND

C1N C2P

MAX8631X/Y

C2N

OUT

OUTPUT

UP TO 480mA

10 μ F

MAIN

FLASH

MAX8631XETI+ -40°C to +85°C

MAX8631YETI+ -40°C to +85°C

*EP = Exposed pad.

+Denotes a lead-free package.

28 Thin QFN-EP*

4mm x 4mm (T2844-1)

28 Thin QFN-EP*

4mm x 4mm (T2844-1)

MAIN ON/OFF

AND DIMMING

FLASH ON/OFF

ENM1

ENM2

ENF

DUAL-LDO ON/OFF

ENLDO

LDO1

CAMERA

DUAL-LDO

VOLTAGE

LDO2

1 μ F

MODULE

SELECTION

SETM

SETF

REF

0.01 μ F

Pin Configuration appears at end of data sheet.

________________________________________________________________ Maxim Integrated Products

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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