BST

ISEN

SGND

RTN

RON/SD

SS

FB

SW

1

2

3

4

5

10

9

8

7

6

VCC

VIN

LM34910C

www.ti.com

SNVS517B – MAY 2007 – REVISED MARCH 2013

LM34910C High Voltage (50V, 1.25A) Step Down Switching Regulator

Check for Samples: LM34910C

1

FEATURES

DESCRIPTION

The LM34910C Step Down Switching Regulator

2

•

Integrated 55V, N-Channel Buck Switch

features all of the functions needed to implement a

•

Integrated Start-Up Regulator

low cost, efficient, buck bias regulator capable of

•

Input Voltage Range: 8V to 50V

supplying 1.25A to the load. This buck regulator

contains a 55V N-Channel Buck Switch, and is

•

No Loop Compensation Required

available

in

the

thermally

enhanced

WSON-10

•

Ultra-Fast Transient Response

package. The hysteretic regulation scheme requires

•

Operating Frequency Remains Constant with

no loop compensation, results in fast load transient

Load Current and Input Voltage

response, and simplifies circuit implementation. The

operating frequency remains constant with line and

•

Maximum Duty Cycle Limited During Start-Up

load

variations

due

to

the

inverse

relationship

•

Adjustable Output Voltage

between the input voltage and the on-time. The

•

Valley Current Limit At 1.25A

current limit detection is set at 1.25A. Additional

features include: VCC under-voltage lockout, thermal

•

Precision Internal Reference

shutdown, gate drive under-voltage lockout, and

•

Low Bias Current

maximum duty cycle limiter.

•

Highly Efficient Operation

•

Thermal Shutdown

Package

•

WSON-10 (4 mm x 4 mm)

TYPICAL APPLICATIONS

•

Exposed

Thermal

Pad

For

Improved

Heat

Dissipation

•

High Efficiency Point-Of-Load (POL) Regulator

•

Non-Isolated Telecommunication Buck

Regulator

•

Secondary High Voltage Post Regulator

Connection Diagram

10-Lead WSON

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 © 2007–2013, 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.