Datasheet > LM20145_08

LM20145_08

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	690K
描述
5A, PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator

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LM20145_08 数据手册

January 16, 2008

LM20145

5A, PowerWise^®Adjustable Frequency Synchronous Buck

Regulator

General Description

Features

The LM20145 is a full featured adjustable frequency syn-

chronous buck regulator capable of delivering up to 5A 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 switching frequency (250 kHz to 750 kHz)

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 LM20145 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 LM20145 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.

Applications

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 frequency of this device can be adjusted from 250 kHz to

750 kHz by connecting an external resistor from the RT pin to

ground.

■

The LM20145 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

30030701

PowerWise is a registered trademark of National Semiconductor Corporation.

300307

www.national.com

12 3 4 5 6 7...22

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与LM20145_08相关器件

型号	品牌	获取价格	描述	数据表
LM20145_15	TI	获取价格	5A PowerWise Adjustable Frequency Synchronous Buck Regulator
LM20145MH	NSC	获取价格	5A, PowerWise㈢ Adjustable Frequency Synchrono
LM20145MH/NOPB	TI	获取价格	5A PowerWise Adjustable Frequency Synchronous Buck Regulator
LM20145MHE	NSC	获取价格	5A, PowerWise㈢ Adjustable Frequency Synchrono
LM20145MHE/NOPB	TI	获取价格	5A PowerWise Adjustable Frequency Synchronous Buck Regulator
LM20145MHX	NSC	获取价格	5A, PowerWise㈢ Adjustable Frequency Synchrono
LM20145MHX/NOPB	NSC	获取价格	IC 8.1 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO16, TSSOP-16, Switching Regu
LM20145MHX/NOPB	TI	获取价格	5A PowerWise Adjustable Frequency Synchronous Buck Regulator
LM20145-Q1	TI	获取价格	5A PowerWise Adjustable Frequency Synchronous Buck Regulator
LM20145QMH/NOPB	TI	获取价格	5A PowerWise Adjustable Frequency Synchronous Buck Regulator

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