MAX8901B

更新时间： 2024-11-23 03:14:59

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
15页	299K
描述
Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package

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MAX8901B 数据手册

19-0865; Rev 0; 8/07

Highest Efficiency Supply for 2 to 6

Series WLEDs in a 2mm x 2mm TDFN Package

/MAX8901B

General Description

Features

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.

♦ 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

Accuracy

♦ Flexible Dimming Control

Direct PWM Dimming (MAX8901A)

32-Step, 1-Wire Serial Dimming

(MAX8901B)

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).

♦ 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

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.

Ordering Information

PKG

CODE

TOP

MARK

PART

PIN-PACKAGE

8 TDFN-EP*

2mm x 2mm

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

TDFN-EP packages (0.8mm max height).

MAX8901AETA+T

MAX8901BETA+T

T822-1

+ABA

+ABB

Applications

8 TDFN-EP*

2mm x 2mm

Display Backlight (from 2 to 6 WLEDs)

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

temperature range.

Cellular Phones

PDAs and Smartphones

MP3 and Portable Media Players

Portable Navigation Devices

Digital Cameras

+Denotes a lead-free package.

*EP = Exposed paddle.

T = Tape and reel.

Pin Configuration appears at end of data sheet.

Typical Operating Circuits

INPUT

2.6V TO 5.5V

INPUT

2.6V TO 5.5V

OUTPUT

UP TO 25V

OUTPUT

UP TO 25V

MAX8901A

MAX8901B

COMP

GND

OVP

COMP

GND

PGND

PWM DIMMING

CONTROL

SERIAL-PULSE

DIMMING

CONTROL

PGND

________________________________________________________________ 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.

12 3 4 5 6 7...15

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与MAX8901B相关器件

型号	品牌	获取价格	描述	数据表
MAX8901BETA	MAXIM	获取价格	Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package
MAX8901BETA+	MAXIM	获取价格	暂无描述
MAX8901BETA+CH8	MAXIM	获取价格	LED Driver
MAX8901BETA+T	MAXIM	获取价格	LED Driver, 6-Segment, BICMOS, 2 X 2 MM, 0.80 MM HEIGHT, LEAD FREE, TDFN-8
MAX8901BETA+TCH8	MAXIM	获取价格	LED Driver
MAX8902	MAXIM	获取价格	Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package
MAX8902A	MAXIM	获取价格	Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package
MAX8902A	ADI	获取价格	Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package
MAX8902A_08	MAXIM	获取价格	Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package
MAX8902A_11	MAXIM	获取价格	Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package

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