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LM20154

更新时间： 2024-09-23 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
22页	721K
描述
4A, 1MHz PowerWise㈢ Synchronous Buck Regulator with SYNCOUT

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LM20154 数据手册

November 13, 2007

LM20154

4A, 1MHz PowerWise^®Synchronous Buck Regulator with

SYNCOUT

General Description

Features

The LM20154 is a full featured 1 MHz synchronous buck reg-

ulator capable of delivering up to 4A 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 requires two ex-

ternal components, providing maximum flexibility 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

96% peak efficiency at 1.0 MHz switching frequency

Frequency synchronization output

32 mΩ integrated FET switches

Starts up into pre-biased loads

Output voltage tracking

■

Peak current mode control

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.

Adjustable output voltage down to 0.8V

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 LM20154 features an open drain SYNCOUT pin which

provides an external clock that matches the switching fre-

quency of the device but is shifted by 180 degrees.

Applications

Simple to design, high efficiency point of load regulation

■

from a 5V or 3.3V bus

The LM20154 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 LM20154 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 LM20154 is offered in an exposed pad 16-pin eTSSOP

package that can be soldered to the PCB, eliminating the

need for bulky heatsinks.

Typical Application Circuit

30030801

PowerWise is a registered trademark of National Semiconductor Corporation.

300308

www.national.com

12 3 4 5 6 7...22

中文翻译

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与LM20154相关器件

型号	品牌	获取价格	描述	数据表
LM20154_08	NSC	获取价格	4A, 1MHz PowerWise㈢ Synchronous Buck Regulato
LM20154MH	NSC	获取价格	4A, 1MHz PowerWise㈢ Synchronous Buck Regulato
LM20154MH	TI	获取价格	LM20154/LM20154-Q1 4A, 1MHz Synchronous Buck Regulator with SYNCOUT
LM20154MH/NOPB	TI	获取价格	LM20154/LM20154-Q1 4A, 1MHz Synchronous Buck Regulator with SYNCOUT
LM20154MHE	NSC	获取价格	4A, 1MHz PowerWise㈢ Synchronous Buck Regulato
LM20154MHE/NOPB	TI	获取价格	LM20154/LM20154-Q1 4A, 1MHz Synchronous Buck Regulator with SYNCOUT
LM20154MHX	NSC	获取价格	4A, 1MHz PowerWise㈢ Synchronous Buck Regulato
LM20154MHX/NOPB	TI	获取价格	LM20154/LM20154-Q1 4A, 1MHz Synchronous Buck Regulator with SYNCOUT
LM20157AB	LIGHTKEY	获取价格	2.00 inch 5x7 Dot Matrix LED Display
LM20157AD	LIGHTKEY	获取价格	2.00 inch 5x7 Dot Matrix LED Display

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