VIN

SW

BST

LM2694

VCC

SS

RON/SD

8V - 30V

Input

C1

R2

R1

C2

L1

C3

C4

D1

C6

RTN

ISEN

SGND

FB

SHUTDOWN

R3

LM2694

www.ti.com

SNVS444A – MAY 2006 – REVISED APRIL 2013

LM2694 30V, 600 mA Step Down Switching Regulator

Check for Samples: LM2694

1

FEATURES

DESCRIPTION

The LM2694 Step Down Switching Regulator features

2

•

Integrated N-Channel Buck Switch

all of the functions needed to implement a low cost,

•

Integrated Start-Up Regulator

efficient, buck bias regulator capable of supplying

•

Input Voltage Range: 8V to 30V

0.6A to the load. This buck regulator contains an N-

Channel Buck Switch, and is available in the 3 x 3

•

No Loop Compensation Required

thermally

enhanced

WSON-10

package

and

a

•

Ultra-Fast Transient Response

TSSOP-14

package.

The

feedback

regulation

•

Operating Frequency Remains Constant with

scheme requires no loop compensation, results in

Load Current and Input Voltage Variations

fast load transient response, and simplifies circuit

implementation. The operating frequency remains

•

Maximum Duty Cycle Limited During Start-Up

constant with line and load variations due to the

•

Adjustable Output Voltage

inverse relationship between the input voltage and

•

Valley Current Limit At 0.6A

the on-time. The valley current limit results in a

smooth transition from constant voltage to constant

•

Maximum Switching Frequency: 1 MHz

current mode when current limit is detected, reducing

•

Precision Internal Reference

the frequency and output voltage, without the use of

•

Low Bias Current

foldback. Additional features include: VCC under-

voltage lockout, thermal shutdown, gate drive under-

•

Highly Efficient Operation

voltage lockout, and maximum duty cycle limiter.

•

Thermal Shutdown

Package

TYPICAL APPLICATIONS

•

WSON-10 (3 mm x 3 mm) w/Exposed Pad

•

High Efficiency Point-Of-Load (POL) Regulator

•

TSSOP-14

•

Non-Isolated Telecommunication Buck

Regulator

•

Secondary High Voltage Post Regulator

Basic Step Down Regulator

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.