LM2748

更新时间： 2024-11-24 23:16:47

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	1047K
描述
Synchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization

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LM2748 数据手册

May 2005

LM2745/8

Synchronous Buck Controller with Pre-bias Startup, and

Optional Clock Synchronization

General Description

Features

n Switching frequency from 50 kHz to 1 MHz

n Switching frequency synchronize range 250 kHz to 1

MHz (LM2745 Only)

The LM2745/8 are high-speed synchronous buck regulator

controllers with an accurate feedback voltage accuracy of

1.5%. It can provide simple down conversion to output

voltages as low as 0.6V. Though the control sections of the

IC are rated for 3 to 6V, the driver sections are 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 MOSFETs 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 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

1.5% feedback voltage accuracy over temperature

n Low-side adjustable current sensing

n Adjustable soft-start

n Tracking and sequencing with shutdown and soft start

pins

The LM2745/8 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 LM2745

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 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

20137401

DS201374

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与LM2748相关器件

型号	品牌	获取价格	描述	数据表
LM2748MTC	NSC	获取价格	Synchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization
LM2748MTC	TI	获取价格	LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup
LM2748MTC/NOPB	TI	获取价格	LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup
LM2748MTCX	TI	获取价格	LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock
LM2748MTCX	NSC	获取价格	Synchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization
LM2748MTCX/NOPB	TI	获取价格	LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup
LM2750	NSC	获取价格	Low Noise, 5.0V Regulated Switched Capacitor Voltage Converter
LM2750	TI	获取价格	LM2750 Low Noise Switched Capacitor Boost Regulator
LM2750LD-5.0	NSC	获取价格	Low Noise, 5.0V Regulated Switched Capacitor Voltage Converter
LM2750LD-5.0	TI	获取价格	LM2750 Low Noise Switched Capacitor Boost Regulator

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