MAX8901B Maxim Integrated Products, MAX8901B Datasheet

MAX8901B

Manufacturer Part Number

MAX8901B

Description

Highest Efficiency Supply

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8901B.pdf (15 pages)

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The MAX8901A/MAX8901B step-up converters drive from

two to six series-connected white LEDs (WLEDs) with

constant current to provide uniform WLED intensity for

LCD backlighting in cell phones, PDAs, and other hand-

held devices. The MAX8901_ operate at a fixed 750kHz

(typ) switching frequency, allowing for tiny external com-

ponents, and are optimized for the highest possible effi-

ciency over the full 1-cell Li+/Li-Poly battery range.

These converters use a single input (ON) to enable the

IC and to control WLED intensity. The MAX8901A

requires a direct PWM input to regulate WLED intensity

with the WLED current proportional to the PWM duty

cycle. The MAX8901B uses single-wire, serial-pulse

dimming that reduces the WLED intensity in 32 linear

steps. Full-scale WLED current for serial-pulse

dimming is 24.75mA (MAX8901B, 0.75mA/step).

The MAX8901_ features an internal soft-start to eliminate

inrush currents during startup, input overvoltage

protection, WLED overvoltage protection, and a shut-

down mode with 0.01µA (typ) shutdown current. No

WLED current is present in shutdown provided the

WLED forward voltage is greater than the input supply

voltage. Additional features include undervoltage lock-

out (UVLO) and thermal shutdown.

The MAX8901_ are available in tiny 8-pin, 2mm x 2mm

TDFN-EP packages (0.8mm max height).

19-0865; Rev 0; 8/07

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.

Series WLEDs in a 2mm x 2mm TDFN Package

PWM DIMMING

2.6V TO 5.5V

CONTROL

INPUT

Display Backlight (from 2 to 6 WLEDs)

Cellular Phones

PDAs and Smartphones

MP3 and Portable Media Players

Portable Navigation Devices

Digital Cameras

COMP

GND

________________________________________________________________ Maxim Integrated Products

MAX8901A

General Description

PGND

OVP

Highest Efficiency Supply for 2 to 6

Applications

UP TO 25V

OUTPUT

♦ High Efficiency, Up to 91%

♦ 2.6V to 5.5V Input Voltage Range

♦ Fixed-Frequency Operation

♦ Supplies from 2 to 6 WLEDs with 1% LED Current

♦ Flexible Dimming Control

♦ Input Undervoltage Lockout

♦ Input Overvoltage Lockout

♦ WLED Overvoltage Protection (25V typ)

♦ 0.01µA (typ) Shutdown Current

♦ No WLED Current in Shutdown

♦ Internal Soft-Start and Thermal Shutdown

Note: All devices are specified over the -40°C to +85°C operating

temperature range.

T = Tape and reel.

Pin Configuration appears at end of data sheet.

MAX8901AETA+T

MAX8901BETA+T

EP = Exposed paddle.

Denotes a lead-free package.

Accuracy

Direct PWM Dimming (MAX8901A)

32-Step, 1-Wire Serial Dimming

(MAX8901B)

2.6V TO 5.5V

SERIAL-PULSE

INPUT

DIMMING

CONTROL

PART

Typical Operating Circuits

COMP

GND

8 TDFN-EP*

2mm x 2mm

8 TDFN-EP*

2mm x 2mm

PIN-PACKAGE

Ordering Information

MAX8901B

PGND

OVP

T822-1

CODE

PKG

Features

MARK

+ABA

+ABB

UP TO 25V

TOP

OUTPUT

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