FB

SNS

FPWM

PGND

CSL

LG

ILIM

SW/CSH

HG

BOOST

Q1

Q2

D1

LM3495

SGND

FREQ/SYNC

COMP/SD

VIN

VLIN5

TRACK

VLIN5

L1

LM3495

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SNVS410F – FEBRUARY 2006 – REVISED APRIL 2013

LM3495 Emulated Peak Current Mode Buck Controller for Low Output Voltage

Check for Samples: LM3495

1

FEATURES

DESCRIPTION

The LM3495 is a PWM buck regulator which

2

•

Input Voltage from 2.9V to 18V

implements a unique emulated peak current mode

•

Output Voltage Adjustable from 0.6V to 5.5V

control. This control method eliminates the switching

•

Feedback Accuracy: ±1%

noise which typically limits current mode operation at

extremely short duty cycles and high operating

•

Low-Side Sensing, Programmable Current

frequency. The switching frequency is programmable

Limit without Sense Resistor

between 200 kHz and 1.5 MHz, and can also be

•

Input Under Voltage Lockout

synchronized to an external clock. The LM3495 is

•

Hiccup Mode Current Limit Protection

also very fault tolerant with both switch node short,

Eliminates Thermal Runaway During Fault

hiccup mode, and adaptive duty cycle limit protection.

A 0.6V 1% reference and glitch free pre-biased start-

Conditions

up ensure the most demanding digital loads operate

•

Internal Soft Start with Tracking Capability

reliably. Internal soft start and the ability to track the

•

200 kHz to 1.5 MHz Switching Frequency,

output of another supply make the LM3495 versatile

Synchronizable

and efficient.

•

On-Chip Gate Drivers

APPLICATIONS

•

Soft Output Discharge During Shutdown

•

Wide Input Voltage Buck Converters with Low

•

Startup into Output Pre-Bias

Voltage, High Accuracy Outputs

•

Operation from a Single Input Rail

•

Core Logic Regulators

•

Adaptive Duty Cycle Limit

•

High-Efficiency Buck Regulation

•

TSSOP-16 Package

Typical Application

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.