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LM20146

更新时间： 2024-11-11 11:33:55

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	501K
描述
6A, Adjustable Frequency Synchronous Buck Regulator

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LM20146 数据手册

February 12, 2009

LM20146

6A, Adjustable Frequency Synchronous Buck Regulator

General Description

Features

The LM20146 is a full featured adjustable frequency syn-

chronous buck regulator capable of delivering up to 6A 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 suitable 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)

16mΩ and 20mΩ 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 are 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 LM20146 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 LM20146 is pre-biased at startup it will not

pull the ouput low.

Applications

Simple to design, high efficiency point of load regulation

■

from a 5V or 3.3V bus

High Performance DSPs, FPGAs, ASICs and

microprocessors

■

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.

Broadband, Networking and Optical Communications

Infrastructure

■

The LM20146 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

30053801

PowerWise is a registered trademark of National Semiconductor Corporation.

300538

www.national.com

12 3 4 5 6 7...22

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与LM20146相关器件

型号	品牌	获取价格	描述	数据表
LM20146MH	NSC	获取价格	6A, Adjustable Frequency Synchronous Buck Regulator
LM20146MH/NOPB	TI	获取价格	6A，可调节频率同步降压稳压器 \| PWP \| 16 \| -40 to 125
LM20146MHE	NSC	获取价格	6A, Adjustable Frequency Synchronous Buck Regulator
LM20146MHE/NOPB	TI	获取价格	6A，可调节频率同步降压稳压器 \| PWP \| 16 \| -40 to 125
LM20146MHX	NSC	获取价格	6A, Adjustable Frequency Synchronous Buck Regulator
LM20146MHX/NOPB	TI	获取价格	6A，可调节频率同步降压稳压器 \| PWP \| 16 \| -40 to 125
LM20154	NSC	获取价格	4A, 1MHz PowerWise㈢ Synchronous Buck Regulato
LM20154	TI	获取价格	具有 SYNCOUT 的 4A、1MHz 同步降压稳压器
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

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