MAX8608YETD+T【PDF 1/11 页】IC LED DRVR WT/OLED BCKLT 14TDFN

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ATION

EVALU

AVAILA

19-3881; Rev 0; 10/05

KIT

B LE

High-Efficiency, 26V Step-Up Converters for Main

and Subdisplays Using OLEDs and/or White LEDs

General Description

The MAX8608Y/MAX8608Z dual LED drivers use a sin-

gle inductor to provide two outputs for either organic

LED (OLED) power or white LED (WLED) drive in dual-

display cell phones. Each output can be configured for

either voltage regulation (adjustable up to 26V) for OLED

or current regulation (adjustable up to 40mA) for WLED.

The topology integrates a single 1MHz/500kHz PWM

step-up converter and two output load switches to mini-

mize size and external components and maximize effi-

ciency. Each output (OUTA, OUTB) is enabled by

individual logic inputs for simplicity; however, if ENA is

high, ENB is overridden and OUTB becomes disabled.

A single CTRL input accepts either an analog or direct-

PWM dimming signal for proportional control of the out-

put voltage or current. Internal lowpass filtering

eliminates the need for any external filters at CTRL

while maintaining low input and output ripple under all

conditions.

The MAX8608Y features a T A derating function to avoid

overdriving the LEDs during high ambient tempera-

tures, enabling higher drive current below +40°C. Other

features shared by both devices include soft-start, out-

Features

? For Dual Displays

OLED + OLED

White LED + OLED

White LED + White LED

? Two Outputs Share One Inductor and One

Schottky Diode

? Output True Shutdown

? Over 83% Efficiency at 13V to 20V/10mA to 20mA

? Up to 900mW Output Power

? Flexible Analog or PWM Dimming Control

? Selectable 1MHz or 500kHz PWM Operation

? Temperature Derating (MAX8608Y)

? Small, Low-Profile External Components

? 26V Output Overvoltage Protection

? Optimized for Low Input/Output Ripple

? Soft-Start Eliminates Inrush Current

Ordering Information

put overvoltage protection, output overcurrent/short-cir-

cuit protection, output True Shutdown?, and thermal

shutdown.

The MAX8608Y/MAX8608Z are available in a space-

saving, 14-pin, 3mm x 3mm TDFN lead-free package.

PART

MAX8608YETD+

MAX8608ZETD+

PIN-PACKAGE

14 TDFN 3mm x 3mm

T1433-2

14 TDFN 3mm x 3mm

T1433-2

TOP

MARK

ANN

ANO

PKG

CODE

T1433-1

Applications

OLED Power and/or White LED Backlights

Cell Phones and Smartphones

PDAs, Palmtops, and Wireless Handhelds

Note: All parts are specified in the -40°C to +85°C extended

temperature range.

+ Denotes lead-free package.

Pin Configuration

TOP VIEW

MAX8608Y/

MAX8608Z

True Shutdown is a trademark of Maxim Integrated Products, Inc.

3mm x 3mm x 0.8mm

TDFN

________________________________________________________________ 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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