Datasheet > LM20242_08

LM20242_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
20页	464K
描述
36V, 2A PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator

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LM20242_08 数据手册

March 11, 2008

LM20242

36V, 2A PowerWise^®Adjustable Frequency Synchronous

Buck Regulator

General Description

Features

The LM20242 is a full featured 1MHz capable synchronous

buck regulator capable of delivering up to 2A of load current.

The current mode control loop is externally compensated with

only two external components, offering both high perfor-

mance 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.

2A Output Current, 3.7A peak current

■

130 mΩ/110 mΩ integrated power MOSFETs

1.5% output voltage accuracy

■

Current Mode Control, selectable compensation

Resistor programmed, 1MHz capable oscillator

Synchronous rectifier with diode emulation

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 PGOOD circuit.

Programmable soft-start with external capacitor

Precision enable pin with hysteresis

OVP, UVLO inputs and PGOOD output

Internally protected with peak current limit, thermal

shutdown and restart

The LM20242 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 LM20242 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.

Accurate current limit with frequency foldback

Non-linear current mode slope compensation

eTSSOP-20 exposed pad package

■

Applications

The LM20242 is offered in an exposed pad 20 pin TSSOP

package that can be soldered to the PCB, eliminating the

need for bulky heatsinks.

Simple to design, high efficiency point of load regulation

■

from a 4.5V to 36V bus

High Performance DSPs, FPGAs, ASICs and

Microprocessors

■

Communications Infrastructure, Automotive

■

Simplified Application Circuit

30031401

PowerWise is a registered trademark of National Semiconductor Corporation.

300314

www.national.com

12 3 4 5 6 7...20

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与LM20242_08相关器件

型号	品牌	获取价格	描述	数据表
LM20242MH	NSC	获取价格	36V, 2A PowerWise㈢ Adjustable Frequency Synch
LM20242MH/NOPB	TI	获取价格	4.5-36V 2A 电流模式可调频率同步降压稳压器 \| PWP \| 20 \| -40 t
LM20242MHE	NSC	获取价格	36V, 2A PowerWise㈢ Adjustable Frequency Synch
LM20242MHE/NOPB	TI	获取价格	4.5-36V 2A 电流模式可调频率同步降压稳压器 \| PWP \| 20 \| -40 t
LM20242MHX	NSC	获取价格	36V, 2A PowerWise㈢ Adjustable Frequency Synch
LM20242MHX/NOPB	TI	获取价格	4.5-36V 2A 电流模式可调频率同步降压稳压器 \| PWP \| 20 \| -40 t
LM202602-H-A-300	MACOM	获取价格	PIN Diode Limiters 2 - 6 GHz
LM202602-H-C-300	MACOM	获取价格	PIN Diode Limiters
LM202802-L-C-300	MACOM	获取价格	Octave Band, Low Power
LM202802-M-C-300	MACOM	获取价格	Octave Band, Medium Power

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