LM3485MM+ National Semiconductor, LM3485MM+ Datasheet

LM3485MM+

Manufacturer Part Number

LM3485MM+

Description

Manufacturer

National Semiconductor

Datasheet

1.LM3485MMNOPB.pdf (16 pages)

Specifications of LM3485MM+

Notes

NEW

Date_code

10+

Current page: 1 of 16
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LM3485

Hysteretic PFET Buck Controller

General Description

The LM3485 is a high efficiency PFET switching regulator

controller that can be used to quickly and easily develop a

small, low cost, 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. Another ben-

efit is high efficiency operation at light loads without an

increase in output ripple.

Current limit protection is provided by measuring the voltage

across the PFET’s R

sense resistor. The cycle-by-cycle current limit can be ad-

justed 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

Typical Application Circuit

DS(ON)

, thus eliminating the need for a

DS200346

n 4.5V to 35V wide input range

n 1.242V to V

n High Efficiency 93%

n 100% duty cycle

n Maximum operating frequency

n Current limit protection

n MSOP-8

Applications

n 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

1.3% (

2% over temp) internal reference

adjustable output range

1MHz

September 2004

20034608

www.national.com

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