Datasheet > LM2854

LM2854

更新时间： 2024-09-19 04:20:11

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	536K
描述
4A 500 kHz / 1 MHz PowerWise㈢ Synchronous SIMPLE SWITCHER㈢ Buck Regulator

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LM2854 数据手册

April 2, 2008

LM2854

4A 500 kHz / 1 MHz PowerWise® Synchronous SIMPLE

SWITCHER® Buck Regulator

General Description

Features

The LM2854 PowerWise^®SIMPLE SWITCHER^®buck regu-

lator is a 500 kHz or 1 MHz step-down switching voltage

regulator capable of driving up to a 4A load with exceptional

power conversion efficiency, line and load regulation, and

output accuracy. The LM2854 can accept an input voltage rail

between 2.95V and 5.5V and deliver an adjustable and highly

accurate output voltage as low as 0.8V. Externally estab-

lished soft-start with a small capacitor facilitates controlled

start-up, and the LM2854 is capable of starting gracefully into

a pre-biased output voltage. Partial internal compensation re-

duces the number of external passive components and PC

board space typically necessary in a voltage mode buck con-

verter application, yet preserving flexibility to deal with ce-

ramic and/or electrolytic based load capacitors. Lossless

cycle-by-cycle peak current limit is used to protect the load

from an overcurrent or short-circuit fault, and an enable com-

parator simplifies sequencing applications. The LM2854 is

available in an exposed pad TSSOP-16 package that en-

hances the thermal performance of the regulator.

Input voltage range of 2.95V to 5.5V

■

Maximum load current of 4A

Wide bandwidth voltage mode control loop, partial internal

compensation

Fixed switching frequency of 500 kHz or 1 MHz

■

35 mΩ integrated MOSFET switches

Adjustable output voltage down to 0.8V

■

Optimized reference voltage initial accuracy and

temperature drift

External soft-start control with tracking capability

Enable pin with hysteresis

■

Low standby current of 230 µA

Pre-biased load startup capability

Integrated UVLO, OCP and thermal shutdown

100% duty cycle capability

eTSSOP-16 exposed pad package

Applications

Low Voltage POL Regulation from 5V or 3.3V Rail

■

Local Solution for FPGA/DSP/ASIC/µP Core or I/O Power

Broadband Networking and Communications

Infrastructure

Portable Computing

■

Typical Application Circuit

30052801

SIMPLE SWITCHER® is a Registered Trademark of National Semiconductor Corporation.

300528

www.national.com

12 3 4 5 6 7...22

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与LM2854相关器件

型号	品牌	获取价格	描述	数据表
LM2854MH-1000	TI	获取价格	4A 500kHz/1MHz 同步降压稳压器 \| PWP \| 16 \| -40 to 85
LM2854MH-1000	NSC	获取价格	4A 500 kHz / 1 MHz PowerWise㈢ Synchronous SIM
LM2854MH-1000/NOPB	TI	获取价格	4A 500kHz/1MHz 同步降压稳压器 \| PWP \| 16 \| -40 to 85
LM2854MH-500	NSC	获取价格	4A 500 kHz / 1 MHz PowerWise㈢ Synchronous SIM
LM2854MH-500/NOPB	TI	获取价格	4A 500kHz/1MHz 同步降压稳压器 \| PWP \| 16 \| -40 to 85
LM2854MHX-1000	NSC	获取价格	4A 500 kHz / 1 MHz PowerWise㈢ Synchronous SIM
LM2854MHX-1000/NOPB	TI	获取价格	4A 500kHz/1MHz 同步降压稳压器 \| PWP \| 16 \| -40 to 85
LM2854MHX-500	NSC	获取价格	4A 500 kHz / 1 MHz PowerWise㈢ Synchronous SIM
LM2854MHX-500/NOPB	TI	获取价格	4A 500kHz/1MHz 同步降压稳压器 \| PWP \| 16 \| -40 to 85
LM285-ADJ	TI	获取价格	LM185/LM285/LM385 Adjustable Micropower Voltage References

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