Datasheet > GRM31CR71A475KA01

GRM31CR71A475KA01

更新时间： 2024-11-04 12:25:07

品牌	Logo	应用领域
立锜 - RICHTEK		转换器
页数	文件大小	规格书
12页	283K
描述
2.25MHz 1A Synchronous Step-Down Converter

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RT8057A

2.25MHz 1A Synchronous Step-Down Converter

General Description

Features

^z2.7V to 5.5V Wide Input Operation Range

^z2.25MHz Fixed-Frequency PWM Operation

^zUp to 1A Output Current

The RT8057A is a high efficiency Pulse-Width-Modulated

(PWM) step-downDC/DC converter, capable of delivering

1Aoutput current over a wide input voltage range from 2.7V

to 5.5V. The RT8057A is ideally suited for portable

electronic devices that are powered from 1-cell Li-ion

battery or from other power sources such as cellular

phones, PDAs, hand-held devices, game console and

related accessories.

^zUp to 90% Efficiency

^z0.6V Reference Allows Low Output Voltage

^zInternal Soft-Start

^zNo Schottky Diode Required

^zInternal Compensation to Reduce External

Components

The internal synchronous rectifier with low R_DS(ON)

dramatically reduces conduction loss at PWM mode.

No external Schottky diode is required in practical

applications. The RT8057Aenters LowDropout Mode when

normal Pulse -Width Mode cannot provide regulated output

voltage by continuously turning on the upper P-MOSFET.

The RT8057Aenters shut-down mode and consumes less

than 1μA when the EN pin is pulled low. The switching

ripple is easily smoothed-out by small package filtering

elements due to a fixed operating frequency of 2.25MHz.

^zLow Dropout Operation : 100% Duty Cycle

^zRoHS Compliant and Halogen Free

Applications

z Portable Instruments

z Game Console and Accessories

z Microprocessors and DSP Core Supplies

z Cellular Phones

z Wireless and DSL Modems

z PC Cards

The RT8057A is available in a small WDFN-6SL 2x2

package.

Pin Configurations

(TOP VIEW)

Ordering Information

(2)

RT8057A

GND

VIN

Pin 1 Orientation

(2) : Quadrant 2, Follow EIA-481-D

(For WDFN-6SL 2x2 Only)

WDFN-6SL 2x2

Package Type

QW : WDFN-6SL 2x2 (W-Type)

J5 : TSOT-23-5

Lead Plating System

G : Green (Halogen Free and Pb Free)

Note :

VIN GND

Richtek products are :

TSOT-23-5

` RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

Marking Information

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

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.

DS8057A-00 March 2011

www.richtek.com

12 3 4 5 6 7...12

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