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LM20333

更新时间： 2025-08-17 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	518K
描述
36V, 3A PowerWise㈢ Synchronous Buck Regulator with Frequency Synchronization

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LM20333 数据手册

June 2, 2008

LM20333

36V, 3A PowerWise^®Synchronous Buck Regulator with

Frequency Synchronization

General Description

Features

The LM20333 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.

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

Oscillator synchronization from 250kHz to 1.5MHz

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 LM20333 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 LM20333 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.

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 switching frequency of the LM20333 can be synchro-

nized to an external clock by use of the SYNC pin. The SYNC

pin is capable of synchronizing to input signals ranging from

250 kHz to 1.5 MHz.

Applications

Simple to design, high efficiency point of load regulation

■

from a 4.5V to 36V bus

The LM20333 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

30051601

PowerWise is a registered trademark of National Semiconductor Corporation.

300516

www.national.com

12 3 4 5 6 7...20

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与LM20333相关器件

型号	品牌	获取价格	描述	数据表
LM20333A	NSC	获取价格	36V, 3A Synchronous Buck Regulator with Frequency Synchronization
LM20333AMH	NSC	获取价格	36V, 3A Synchronous Buck Regulator with Frequency Synchronization
LM20333AMHE	NSC	获取价格	36V, 3A Synchronous Buck Regulator with Frequency Synchronization
LM20333AMHX	NSC	获取价格	36V, 3A Synchronous Buck Regulator with Frequency Synchronization
LM20333MH	NSC	获取价格	36V, 3A PowerWise㈢ Synchronous Buck Regulator
LM20333MH/NOPB	TI	获取价格	LM20333 36V, 3A Synchronous Buck Regulator with Frequency Synchronization
LM20333MHE	NSC	获取价格	36V, 3A PowerWise㈢ Synchronous Buck Regulator
LM20333MHE/NOPB	TI	获取价格	LM20333 36V, 3A Synchronous Buck Regulator with Frequency Synchronization
LM20333MHX	NSC	获取价格	36V, 3A PowerWise㈢ Synchronous Buck Regulator
LM20333MHX/NOPB	TI	获取价格	LM20333 36V, 3A Synchronous Buck Regulator with Frequency Synchronization

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