APW7143 查看數據表（PDF） - Anpec Electronics

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APW7143

3A, 12V, Asynchronous Buck Converter

Anpec Electronics 

APW7143

3A, 12V, Asynchronous Buck Converter

Features

General Description

• Wide Input Voltage from 4.3V to 14V

• Output Current up to 3A

• Adjustable Output Voltage from 0.8V to VIN

- ±2% System Accuracy

• 70mΩ Integrated Power MOSFET

• High Efficiency up to 92%

- Automatic Skip/PWM Mode Operation

• Current-Mode Operation

- Easy Feedback Compensation

- Stable with Low ESR Output Capacitors

- Fast Load/Line Transient Response

• Power-On-Reset Monitoring

• Fixed 500kHz Switching Frequency in PWM mode

• Built-in Digital Soft-Start

• Current-Limit Protection with Frequency Foldback

• Hiccup-Mode 50% Undervoltage Protection

• Over-Temperature Protection

• <3µA Quiescent Current in Shutdown Mode

• Small SOP-8 Package

• Lead Free and Green Devices Available

(RoHS Compliant)

Applications

• OLPC, UMPC

• Notebook Computer

• Handheld Portable Device

• Step-down Converters Requiring High Efficiency

and 3A Output Current

The APW7143 is a 3A asynchronous Buck converter with

an integrated 70mΩ P-channel power MOSFET. The

APW7143, designed with a current-mode control scheme,

can convert wide input voltage of 4.3V to 14V to the output

voltage adjustable from 0.8V to VIN to provide excellent

output voltage regulation.

For high efficiency over all load current range, the

APW7143 is equipped with an automatic Skip/PWM

mode operation. At light load, the IC operates in the Skip

mode, which keeps a constant minimum inductor peak

current, to reduce switching losses. At heavy load, the IC

works in PWM mode, which inductor peak current is pro-

grammed by the COMP voltage, to provide high efficiency

and excellent output voltage regulation.

The APW7143 is also equipped with power-on-reset,

soft-start, and whole protections (undervoltage, over

temperature, and current-limit) into a single package. In

shutdown mode, the supply current drops below 3µA.

This device, available in an 8-pin SOP-8 package, pro-

vides a very compact system solution with minimal exter-

nal components and PCB area.

100

90

80

70

60

50

VIN=5V, VOUT=3.3V, L1=2.2µH

40

30

VIN=12V, VOUT=5V, L1=6.8µH

20

10

VIN=12V, VOUT=3.3V, L1=4.7µH

0

0.001

0.01

0.1

1

10

Output Current, IOUT(A)

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and

advise customers to obtain the latest version of relevant information to verify before placing orders.

Copyright © ANPEC Electronics Corp.

1

Rev. A.1 - Apr., 2008

www.anpec.com.tw

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