Datasheet > MAX8901

MAX8901

更新时间： 2024-11-06 02:52:55

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
14页	303K
描述
Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package

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中文翻译

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数据手册

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MAX8901 数据手册

EVALUATION KIT AVAILABLE

Highest Efficiency Supply

for 2 to 6 Series WLEDs in a

2mm x 2mm TDFN Package

MAX8901A/MAX8901B

General Description

Benefits and 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

handheld devices. The MAX8901_ operate at a fixed

750kHz (typ) switching frequency, allowing for tiny exter-

nal components, and are optimized for the highest possi-

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

• Cost-Effective and Flexible Solution for Wide Range of

Backlighting Applications

• Supplies from 2 to 6 WLEDs with 1.3% LED Current

Accuracy

• 2.6V to 5.5V Input Voltage Range

• Fixed-Frequency Operation

• Flexible Dimming Control

• Direct PWM Dimming (MAX8901A)

• 32-Step, Single-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).

• Protection Features Improve System Reliability

• WLED Overvoltage Protection (25V typ)

• Internal Soft-Start and Thermal Shutdown

• Input Undervoltage Lockout

• Input Overvoltage Lockout

• High Efficiency Extends Battery Life

• Up to 91% Efficiency

The MAX8901_ feature 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.

• 0.01µA (typ) Shutdown Current

• No WLED Current in Shutdown

• 8-Pin, 2mm x 2mm TDFN Package Saves Space

Ordering Information

PART

PIN-PACKAGE

TOP MARK

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

TDFN-EP packages (0.8mm max height).

8 TDFN-EP*

2mm x 2mm

MAX8901AETA+T

+ABA

8 TDFN-EP*

2mm x 2mm

Applications

MAX8901BETA+T

+ABB

Display Backlight (from 2 to 6 WLEDs)

Cellular Phones

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

temperature range.

+Denotes a lead(Pb)-free/RoHS-compliant package.

PDAs and Smartphones

MP3 and Portable Media Players

Portable Navigation Devices

Digital Cameras

*EP = Exposed pad.

T = Tape and reel.

Pin Configuration appears at end of data sheet.

Typical Operating Circuits

INPUT

2.6V TO 5.5V

OUTPUT

UP TO 25V

MAX8901A

MAX8901B

COMP

GND

OVP

COMP

GND

SERIAL-PULSE

DIMMING

CONTROL

PGND

PWM DIMMING

CONTROL

PGND

19-0865; Rev 4; 5/15

12 3 4 5 6 7...14

中文翻译

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与MAX8901相关器件

型号	品牌	获取价格	描述	数据表
MAX8901A	MAXIM	获取价格	Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package
MAX8901A	ADI	获取价格	效率最高的2至6只串联WLED供电电源，2mm x 2mm TDFN封装
MAX8901AETA	MAXIM	获取价格	Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package
MAX8901AETA+	MAXIM	获取价格	LED Driver, BICMOS, PDSO8
MAX8901AETA+T	MAXIM	获取价格	LED Driver, 6-Segment, BICMOS, 2 X 2 MM, 0.80 MM HEIGHT, LEAD FREE, TDFN-8
MAX8901B	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	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

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