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LM20343

更新时间： 2024-11-12 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
20页	545K
描述
36V, 3A Adjustable Frequency Synchronous Buck Regulator

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LM20343 数据手册

August 12, 2008

LM20343

36V, 3A Adjustable Frequency Synchronous Buck

Regulator

General Description

The LM20343 is a full featured synchronous buck regulator

capable of delivering up to 3A of load current. The current

mode control loop is externally compensated with only two

components, offering both high performance and ease of use.

The device is optimized to work over the input voltage range

of 4.5V to 36V making it well suited for high voltage systems.

Features

4.5V to 36V input voltage range

■

3A output current, 5.2A peak current

130 mΩ/110 mΩ integrated power MOSFETs

94% peak efficiency with synchronous rectification

1.5% feedback voltage accuracy

■

Current mode control, selectable compensation

Resistor programmed, 1MHz capable oscillator

Adjustable output voltage down to 0.8V

Compatible with pre-biased loads

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. Startup inrush currents are limited by both an in-

ternally fixed and externally adjustable soft-start circuit. Fault

detection and supply sequencing are possible with the inte-

grated power good (PGOOD) circuit.

Programmable soft-start with external capacitor

Precision enable pin with hysteresis

OVP, UVLO inputs and PGOOD output

The frequency of this device can be adjusted from 250 kHz to

1.0 MHz by connecting an external resistor from the RT pin

to ground.

Internally protected with peak current limit, thermal

shutdown and restart

Accurate current limit minimizes inductor size

Non-linear current mode slope compensation

eTSSOP-20 exposed pad package

■

The LM20343 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 LM20343 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 4.5V to 36V bus

■

The LM20343 is offered in an exposed pad 20-pin eTSSOP

package that can be soldered to the PCB, eliminating the

need for bulky heatsinks.

High Performance DSPs, FPGAs, ASICs and

Microprocessors

■

Communications Infrastructure, Automotive

■

Simplified Application Circuit

30051701

300517

www.national.com

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与LM20343相关器件

型号	品牌	获取价格	描述	数据表
LM20343_15	TI	获取价格	LM20343 36V, 3A Adjustable Frequency Synchronous Buck Regulator
LM20343MH	NSC	获取价格	36V, 3A Adjustable Frequency Synchronous Buck Regulator
LM20343MH/NOPB	TI	获取价格	LM20343 36V, 3A Adjustable Frequency Synchronous Buck Regulator
LM20343MHE	NSC	获取价格	36V, 3A Adjustable Frequency Synchronous Buck Regulator
LM20343MHE/NOPB	TI	获取价格	LM20343 36V, 3A Adjustable Frequency Synchronous Buck Regulator
LM20343MHX	NSC	获取价格	36V, 3A Adjustable Frequency Synchronous Buck Regulator
LM20343MHX/NOPB	TI	获取价格	LM20343 36V, 3A Adjustable Frequency Synchronous Buck Regulator
LM2035	ROHM	获取价格	5 x 7 matrix displays
LM-2035	ROHM	获取价格	5 x 7 matrix displays
LM-2035_1	ROHM	获取价格	5 x 7 matrix display

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