Datasheet > MBR0520LTI

MBR0520LTI

更新时间： 2024-11-18 11:12:11

品牌	Logo	应用领域
美国国家半导体 - NSC		控制器时钟
页数	文件大小	规格书
23页	1006K
描述
Synchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization

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MBR0520LTI 数据手册

March 2006

LM2747

Synchronous Buck Controller with Pre-bias Startup, and

Optional Clock Synchronization

General Description

Features

1% feedback voltage accuracy over temperature

The LM2747 is a high-speed synchronous buck regulator

controller with a feedback voltage accuracy of 1%. It can

provide simple down conversion to output voltages as low as

0.6V. Though the control section of the IC is rated for 3 to 6V,

the driver section is designed to accept input supply rails as

high as 14V. The use of adaptive non-overlapping MOSFET

gate drivers helps avoid potential shoot-through problems

while maintaining high efficiency. The IC is designed for the

more cost-effective option of driving only N-channel MOS-

FETs in both the high-side and low-side positions. It senses

the low-side switch voltage drop for providing a simple,

adjustable current limit.

n Switching frequency from 50 kHz to 1 MHz

n Switching frequency synchronize range 250 kHz to 1

MHz

n Startup with a pre-biased output load

n Power stage input voltage from 1V to 14V

n Control stage input voltage from 3V to 6V

n Output voltage adjustable down to 0.6V

n Power Good flag and shutdown

n Output overvoltage and undervoltage detection

n Low-side adjustable current sensing

n Adjustable soft-start

The LM2747 features a fixed-frequency voltage-mode PWM

control architecture which is adjustable from 50 kHz to 1

MHz with one external resistor. In addition, the LM2747 also

allows the switching frequency to be synchronized to an

external clock signal over the range of 250 kHz to 1 MHz.

This wide range of switching frequency gives the power

supply designer the flexibility to make better tradeoffs be-

tween component size, cost and efficiency.

n Tracking and sequencing with shutdown and soft start

pins

n TSSOP-14 package

Applications

n Down Conversion from 3.3V

n Cable Modem, DSL and ADSL

n Laser Jet and Ink Jet Printers

n Low Voltage Power Modules

n DSP, ASIC, Core and I/O

Features include the ability to startup with a pre-biased load

on the output, soft-start, input undervoltage lockout (UVLO)

and Power Good (based on both undervoltage and overvolt-

age detection). In addition, the shutdown pin of the IC can be

used for providing startup delay, and the soft-start pin can be

used for implementing precise tracking, for the purpose of

sequencing with respect to an external rail.

Typical Application

20150901

DS201509

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