Datasheet > LM20123_08

LM20123_08

更新时间： 2024-02-28 08:02:35

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	579K
描述
3A, 1.5MHz PowerWise㈢ Synchronous Buck Regulator

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LM20123_08 数据手册

January 16, 2008

LM20123

3A, 1.5MHz PowerWise^®Synchronous Buck Regulator

General Description

Features

The LM20123 is a full featured 1.5 MHz synchronous 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 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% efficiency with 1.5 MHz switching frequency

32 mΩ integrated FET switches

Starts up into pre-biased loads

Output voltage tracking

■

Peak current mode control

Adjustable output voltage down to 0.8V

Adjustable Soft-Start with external capacitor

Precision enable pin with hysteresis

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.

Integrated OVP, UVLO, power good and thermal

shutdown

eTSSOP-16 exposed pad package

■

Applications

The LM20123 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 LM20123 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.

Simple to design, high efficiency point of load regulation

from a 5V or 3.3V bus

■

High Performance DSPs, FPGAs, ASICs and

microprocessors

■

Broadband, Networking and Optical Communications

Infrastructure

■

The LM20123 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

30030101

PowerWise is a registered trademark of National Semiconductor Corporation.

300301

www.national.com

12 3 4 5 6 7...20

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与LM20123_08相关器件

型号	品牌	获取价格	描述	数据表
LM20123_15	TI	获取价格	LM20123/LM20123Q 3A, 1.5MHz PowerWiseÂ® Synch
LM20123MH	TI	获取价格	LM20123/LM20123Q 3A, 1.5MHz PowerWise Synchronous Buck Regulator
LM20123MH	NSC	获取价格	3A, 1.5MHz PowerWise㈢ Synchronous Buck Regula
LM20123MH/NOPB	NSC	获取价格	IC 5.3 A SWITCHING REGULATOR, 1650 kHz SWITCHING FREQ-MAX, PDSO16, LEAD FREE, TSSOP-16, Sw
LM20123MH/NOPB	TI	获取价格	LM20123/LM20123Q 3A, 1.5MHz PowerWiseÂ® Synch
LM20123MHE	TI	获取价格	LM20123/LM20123Q 3A, 1.5MHz PowerWise Synchronous Buck Regulator
LM20123MHE	NSC	获取价格	3A, 1.5MHz PowerWise㈢ Synchronous Buck Regula
LM20123MHE/NOPB	TI	获取价格	2.95-5.5V, 3A, Current Mode Synchronous Buck Regulator with Optional Automotive Grade 16-H
LM20123MHX	NSC	获取价格	3A, 1.5MHz PowerWise㈢ Synchronous Buck Regula
LM20123MHX	TI	获取价格	LM20123/LM20123Q 3A, 1.5MHz PowerWise Synchronous Buck Regulator

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