MAX8645YETI+T【PDF 1/14 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

AVAILA

19-3978; Rev 4; 6/08

KIT

B LE

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

Two LDOs in 4mm x 4mm TQFN

General Description

The MAX8645X/MAX8645Y charge pumps drive up to

eight white LEDs with regulated constant current for uni-

form intensity. The main group of LEDs (M1–M6) can be

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

group of LEDs (F1 and F2) is independently controlled

and can be driven up to 200mA per LED (or 400mA total).

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

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

grammable to meet different camera-module require-

ments. The MAX8645X and MAX8645Y differ only in LDO

output voltages. By utilizing adaptive 1x/1.5x/2x charge-

pump modes and very-low-dropout current regulators,

the MAX8645X/MAX8645Y achieve high efficiency over

the full 1-cell lithium-battery voltage range. The 1MHz

fixed-frequency switching allows for tiny external compo-

nents, and the regulation scheme is optimized to ensure

low EMI and low input ripple.

The MAX8645X/MAX8645Y are available in a 28-pin TQFN,

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

Applications

Camera Phones and Smartphones

Backlighting and Flash

PDAs, Digital Cameras, and Camcorders

Typical Operating Circuit

Features

? Power Up to Eight 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 TQFN, 4mm x 4mm Package

Ordering Information

1 μ F

PART

TEMP RANGE

PIN-PACKAGE

INPUT

2.7V TO 5.5V

C1P

C1N

C2P

C2N

OUT

OUTPUT

UP TO 580mA

MAX8645X ETI+

-40°C to +85°C

28 TQFN-EP

4mm x 4mm

10 μ F

GND

PGND

MAX8645X

MAX8645Y

10 μ F

MAIN

FLASH

MAX8645Y ETI+

EP = Exposed pad.

-40°C to +85°C

28 TQFN-EP

4mm x 4mm

+Denotes a lead-free package.

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

Pin Configuration appears at end of data sheet.

0.01 μ F

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim's website at www.maxim-ic.com.

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