LM3489MM datasheet(1/15 Pages) NSC

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LM3489

Hysteretic PFET Buck Controller with Enable Pin

General Description

The LM3489 is a high efficiency PFET switching regulator

controller that can be used to quickly and easily develop a

small, cost effective, switching buck regulator for a wide

range of applications. The hysteretic control architecture

provides for simple design without any control loop stability

concerns using a wide variety of external components. The

PFET architecture also allows for low component count as

well as ultra-low dropout, 100% duty cycle operation. An-

other benefit is high efficiency operation at light loads without

an increase in output ripple. A dedicated Enable Pin provides

a shutdown mode drawing only 7µA. Leaving the Enable Pin

unconnected defaults to on.

Current limit protection can be implemented by measuring

the voltage across the PFET’s R

DS(ON), thus eliminating the

need for a sense resistor. A sense resistor may be used to

improve current limit accuracy if desired. The cycle-by-cycle

current limit can be adjusted with a single resistor, ensuring

safe operation over a range of output currents.

Features

n

Easy to use control methodology

n

No control loop compensation required

n

Wide 4.5V to 35V input range

n

1.239V to V

IN adjustable output range

n

High efficiency 93%

n ±

1.3% (±2% over temp) internal reference

n

100% duty cycle operation

n

Maximum operation frequency > 1MHz

n

Current limit protection

n

Dedicated enable pin (on if unconnected)

n

Shutdown mode draws only 7µA supply current

n

MSOP-8

Applications

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Set-Top Box

n

DSL/Cable Modem

n

PC/IA

n

Auto PC

n

TFT Monitor

n

Battery Powered Portable Applications

n

Distributed Power Systems

n

Always On Power

n

High Power LED Driver

Typical Application Circuit

20186908

May 2006

DS201869

www.national.com

Số phần tương tự - LM3489MM

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
National Semiconductor ...	LM3489MM	356Kb / 16P	Hysteretic PFET Buck Controller with Enable Pin
Texas Instruments	LM3489MM	1Mb / 25P	Hysteretic PFET Buck Controller With Enable Pin
	LM3489MM/NOPB	1Mb / 25P	Hysteretic PFET Buck Controller With Enable Pin
	LM3489MM/NOPB	852Kb / 28P	LM3489x Hysteretic PFET Buck Controller With Enable Pin REVISED DECEMBER 2016
	LM3489MM/NOPB.A	852Kb / 28P	LM3489x Hysteretic PFET Buck Controller With Enable Pin REVISED DECEMBER 2016

More results

Mô tả tương tự - LM3489MM

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
National Semiconductor ...	LM3485	369Kb / 15P	Hysteretic PFET Buck Controller
National Semiconductor ...	LM3489	356Kb / 16P	Hysteretic PFET Buck Controller with Enable Pin
Texas Instruments	LM3485MM	1Mb / 23P	Hysteretic PFET Buck Controller
	LM3475	1Mb / 21P	Hysteretic PFET Buck Controller
	LM3489	1,020Kb / 23P	Hysteretic PFET Buck Controller with Enable Pin
	LM3485	1,023Kb / 22P	Hysteretic PFET Buck Controller
	LM3485	1Mb / 24P	Hysteretic PFET Buck Controller
	LM3489	1,022Kb / 25P	Hysteretic PFET Buck Controller With Enable Pin
	LM3485	1Mb / 28P	Hysteretic PFET Buck Controller
	LM3489	1Mb / 25P	Hysteretic PFET Buck Controller With Enable Pin

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