VOUT = 2.5V/2A

CIN

COUT

RFB1

RFB2

L1

D1

Q1

10 PF

100 PF

10 PH

1k

2.15k

Si2343

LM3475

VIN

EN

GND

PGATE

FB

1

2

3

4

5

CFF

1 nF

VIN = 5V

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Folder

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LM3475

SNVS239C – OCTOBER 2004 – REVISED OCTOBER 2015

LM3475 Hysteretic PFET Buck Controller

1 Features

3 Description

The LM3475 is a hysteretic P-FET buck controller

1

•

Easy-to-Use Control Methodology

designed to support a wide range of high efficiency

•

0.8 V to VIN Adjustable Output Range

applications in a very small SOT-23-5 package. The

•

High Efficiency (90% Typical)

hysteretic control scheme has several advantages,

including simple system design with no external

•

±0.9% (±1.5% Over Temperature) Feedback

compensation, stable operation with a wide range of

Voltage

components, and extremely fast transient response.

•

100% Duty Cycle Capable

Hysteretic

control

also

provides

high

efficiency

•

Maximum Operating Frequency up to 2 MHz

operation, even at light loads. The PFET architecture

allows for low component count as well as 100% duty

•

Internal Soft-Start

cycle and ultra-low dropout operation.

•

Enable Pin

Device Information(1)

2 Applications

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

TFT Monitor

LM3475

SOT-23 (5)

1.60 mm × 2.90 mm

•

Auto PC

(1) For all available packages, see the orderable addendum at

•

Vehicle Security

the end of the data sheet.

•

Navigation Systems

•

Notebook Standby Supply

•

Battery Powered Portable Applications

•

Distributed Power Systems

Typical Application

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.