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LM20143

更新时间： 2024-11-09 04:20:15

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器
页数	文件大小	规格书
20页	701K
描述
3A, PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator

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LM20143 数据手册

January 16, 2008

LM20143

3A, PowerWise^®Adjustable Frequency Synchronous Buck

Regulator

General Description

Features

The LM20143 is a full featured adjustable frequency syn-

chronous buck regulator capable of delivering up to 3A of

continuous output current. The current mode control loop can

be compensated to be stable with virtually any type of output

capacitor. For most cases, compensating the device only re-

quires two external components, providing maximum flexibil-

ity and ease of use. The device is optimized to work over the

input voltage range of 2.95V to 5.5V making it suited for a wide

variety of low voltage systems.

Input voltage range 2.95V to 5.5V

■

Accurate current limit minimizes inductor size

97% peak efficiency

Adjustable output voltage down to 0.8V

Adjustable switching frequency (500 kHz to 1.5 MHz)

■

32 mΩ integrated FET switches

Starts into prebiased loads

■

Output voltage tracking

The device features internal over voltage protection (OVP)

and over current protection (OCP) circuits for increased sys-

tem reliability. A precision enable pin and integrated UVLO

allows the turn-on of the device to be tightly controlled and

sequenced. Start-up inrush currents are limited by both an

internally fixed and externally adjustable Soft-Start circuit.

Fault detection and supply sequencing is possible with the

integrated power good circuit.

Peak current mode control

Adjustable Soft-Start with external capacitor

Precision enable pin with hysteresis

Integrated OVP, UVLO, power good and thermal

shutdown

eTSSOP-16 exposed pad package

■

The frequency of this device can be adjusted from 500 kHz to

1.5 MHz by connecting an external resistor from the RT pin

to ground.

Applications

Simple to design, high efficiency point of load regulation

■

from a 5V or 3.3V bus

The LM20143 is designed to work well in multi-rail power

supply architectures. The output voltage of the device can be

configured to track a higher voltage rail using the SS/TRK pin.

If the output of the LM20143 is pre-biased at startup it will not

sink current to pull the output low until the internal soft-start

ramp exceeds the voltage at the feedback pin.

High Performance DSPs, FPGAs, ASICs and

microprocessors

■

Broadband, Networking and Optical Communications

Infrastructure

■

The LM20143 is offered in a 16-pin eTSSOP package with an

exposed pad that can be soldered to the PCB, eliminating the

need for bulky heatsinks.

Typical Application Circuit

30030501

PowerWise is a registered trademark of National Semiconductor Corporation.

300305

www.national.com

12 3 4 5 6 7...20

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与LM20143相关器件

型号	品牌	获取价格	描述	数据表
LM20143MH	NSC	获取价格	3A, PowerWise㈢ Adjustable Frequency Synchrono
LM20143MH/NOPB	TI	获取价格	具有调频功能的2.95V 至 5.5V、3A、电流模式同步降压稳压器 \| PWP \| 16
LM20143MHE	NSC	获取价格	3A, PowerWise㈢ Adjustable Frequency Synchrono
LM20143MHE/NOPB	TI	获取价格	具有调频功能的2.95V 至 5.5V、3A、电流模式同步降压稳压器 \| PWP \| 16
LM20143MHX	NSC	获取价格	3A, PowerWise㈢ Adjustable Frequency Synchrono
LM20143MHX/NOPB	TI	获取价格	具有调频功能的2.95V 至 5.5V、3A、电流模式同步降压稳压器 \| PWP \| 16
LM20143-Q1	TI	获取价格	具有调频功能的汽车级 2.95V 至 5.5V、3A、电流模式同步降压稳压器
LM20143QMH/NOPB	TI	获取价格	具有调频功能的汽车级 2.95V 至 5.5V、3A、电流模式同步降压稳压器 \| PWP
LM20143QMHE/NOPB	TI	获取价格	具有调频功能的汽车级 2.95V 至 5.5V、3A、电流模式同步降压稳压器 \| PWP
LM20143QMHX/NOPB	TI	获取价格	具有调频功能的汽车级 2.95V 至 5.5V、3A、电流模式同步降压稳压器 \| PWP

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