Datasheet > AAT2138

AAT2138

更新时间： 2022-05-07 12:54:24

品牌	Logo	应用领域
思佳讯 - SKYWORKS		转换器开关
页数	文件大小	规格书
18页	4073K
描述
High Current Step-Down Converter with High-Precision Programmable Current Limited Load Switch

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AAT2138 数据手册

DATA SHEET

AAT2138

High Current Step-Down Converter

with High-Precision Programmable Current Limited Load Switch

General Description

Features

•

The AAT2138 is a high current synchronous step-down

converter with an integrated current-limited load switch

designed for high precision current control applications.

By guarding against excessive input current, AAT2138

enables the system designer to maximize the output cur-

rent from the step-down converter while protecting the

input supply. It is designed for protection of USB ports

from heavy load transient conditions commonly seen

with high data rate modem applications.

 Input Voltage Range: 2.7V to 5.5 V

• Output Voltage Range: Down to 3.0V

• Current-Limited Load Switch

- ±10% High Precision

- Programmable Current Limit Range: 500mA to 3A

• High-Current Step-Down Converter

- Efficiency up to 95%

- 85mΩ High-Side; 50mΩ Low-Side FETs

- 2.8MHz Switching Frequency

- 100% Low Dropout Operation

AAT2138 integrates a high precision programmable cur-

rent limited P-channel MOSFET load switch to protect the

input supply against large currents which may cause the

supply to fall out of regulation. The current limit thresh-

old is programmed up to 3A by an external resistor

between RSET and ground.

- No External Compensation Required

- PFM/PWM or forced PWM Modes

- 1MHz to 3MHz External Clock Support

• Soft Start

• Independent Enable Pins for Switch and Converter

• Over-Temperature and Over Load Protection

• -40°C to +85°C Temperature Range

• Pb-Free, Low-Profile, 3mmx3mm 14-pin TDFN Package

The AAT2138 is a 2.8MHz current mode step-down con-

verter. It utilizes a tiny 1μH inductor and internal com-

pensation to enable it to have an extremely small foot

print. The regulator supports 100% duty cycle operation

for dropout conditions. An external clock in the range of

1MHz to 3MHz can be fed into MODE as a synchronous

signal for the step-down regulator. This feature offers

the flexibility of fine tuning the switching frequency and

optimizing performance in the application.

Applications

•

Wireless Modem Data Cards

Portable Hard Drives

Portable Memory Card Readers

Barcode Scanners

Credit Card Readers

General USB Powered Devices

AAT2138 is available in a Pb-free, low profile, 14-pin

3mm x 3mm TDFN package. The product is rated over

the -40°C to 85°C temperature range.

Typical Application

OFF

V_IN

ENSYS

RSET

SYSIN

REGIN

2.7V-5.5V

C_IN

1μF

R_SET

1μH

V_OUT

C_IN

10μF

3.4V/3A

Bulk Capacitor

AAT2138

C_IN

0.1

274k Ω

μF

C_OUT

22μF

PGND

59k Ω

ENREG

OFF

PWM

MODE

AGND

PFM/PWM

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

202006C

•

Skyworks Proprietary Information

•

Products and Product Information are Subject to Change Without Notice.

•

March 18, 2013

12 3 4 5 6 7...18

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AAT2138IWO-0.6-T1	SKYWORKS	Switching Regulator, Current-mode, 2800kHz Switching Freq-Max, PDSO14	获取价格
AAT2138IWO-0.6-T12	SKYWORKS	High Current Step-Down Converter with High-Precision Programmable Current Limited Load Swi	获取价格
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