Datasheet > RT9971A

RT9971A

更新时间： 2024-11-09 17:02:03

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
23页	395K
描述
7-CH Power Management IC

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RT9971A 数据手册

RT9971A

7-CH Power Management IC

General Description

Features

l One Synchronous Step-Up or Step-Down

Selectable Convertor

The RT9971A is a complete power supply solution for

digital still cameras and other hand held devices. The

RT9971A is a multi-channel power management IC

including two step-upDC/DC converters, two step-down

DC/DC converters, one selectable step-up/step-downDC/

DC converter, one inverting DC/DC converter and one

WLED driver.

l Support 2AA or Li-ion Battery Applications

l Preset On/Off Sequence

l 5 Channels with Internal Compensation

l All Power Switches Integrated

l Up to 95% Efficiency

l 100% (max) Duty Cycle for Step-Down Converter

l Adjustable Output Voltage

The RT9971A is designed to fulfill the applications forDSC

just as follows :

l LED PWM Dimming Control

CH1 is a synchronous step-up output for motor or DSC

system I/O power

l LED Open Protection

l Transformerless Inverting Converter for CCD

l Fixed 1MHz Switching Frequency at CH1 to CH7

l RTC_LDO/SW1 Selectable by CN Pin

l 40-Lead WQFN Package

CH2 is a selectable synchronous step-up/step-down

output for motor or DSC system I/O power

CH3 and CH4 are synchronous step-down outputs forDSP

core and memory power supply

l RoHS Compliant and Halogen Free

CH5 is a high voltage step-up output for CCD bias power

supply

Applications

l Digital Still Camera

l PDA

CH6 is an inverting output for negative CCD bias power

supply

l PortableDevice

CH7 is a high voltage step-up output for driving WLED

Ordering Information

For the CH2, the step-up or step-down converter, operation

mode can be selected by the SEL pin.Among all channels,

there are 5 channels with the built-in internal

compensation. The RT9971A also provides a

transformerless inverting converter for supplying the CCD

power. For the synchronous step-up and step down

converters, the efficiency can beup to 95%. The IC provides

load disconnection for channel 1 and channel 5. The IC

has selectable RTC_LDO/SW1 that can be determined

by the CN pin.

RT9971A

Package Type

QW : WQFN-40L 5x5 (W-Type)

Lead Plating System

G : Green (Halogen Free and Pb Free)

Note :

Richtek products are :

} RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

} Suitable for use in SnPb or Pb-free soldering processes.

The RT9971A is able to support Li-ion and 2AA battery

applications. The RT9971A provides WLED open

protection, current limit, thermal shutdown protection, over

voltage and under voltage protection to achieve complete

protection. The RT9971A is available in WQFN-40L 5x5

package.

DS9971A-01 April 2011

www.richtek.com

12 3 4 5 6 7...23

中文翻译

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