Datasheet > LM34919_15

LM34919_15

更新时间： 2025-08-18 02:58:15

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Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator

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LM34919_15 数据手册

LM34919C-Q1

www.ti.com

SNVS831A –SEPTEMBER 2013–REVISED DECEMBER 2013

LM34919C-Q1 Ultra Small 50V, 600 mA Constant On-Time Buck Switching Regulator

Check for Samples: LM34919C-Q1

FEATURES

APPLICATIONS

•

AEC-Q100 qualified (T_j= -40°C to 125°C)

Maximum Switching Frequency: 2.6 MHz

Input Voltage Range: 4.5 V to 50 V

Integrated N-Channel buck switch

Integrated Start-Up Regulator

•

Automotive Safety and Infotainment

High Efficiency Point-of-Load (POL) Regulator

Telecommunication Buck Regulator

Secondary Side Post Regulator

•

DESCRIPTION

No Loop Compensation Required

Ultra-Fast Transient Response

The LM34919C Step Down Switching Regulator

features all of the functions needed to implement a

low-cost, efficient, buck bias regulator capable of

supplying 0.6 A to the load. This buck regulator

contains an N-Channel Buck Switch and is available

in DSBGA and WSON packages. The constant on-

time feedback regulation scheme requires no loop

compensation, results in fast load transient response,

and simplifies circuit implementation. The operating

frequency remains constant with line and load

variations due to the inverse relationship between the

input voltage and the on-time. The valley current limit

results in a smooth transition from constant voltage to

constant current mode when current limit is detected,

reducing the frequency and output voltage, without

the use of foldback. Additional features include:

Power Good, enable, VCC undervoltage lockout,

thermal shutdown, gate drive undervoltage lockout,

and maximum duty cycle limiter.

Operating Frequency Remains Constant with

Load Current and Input Voltage

•

Adjustable Output Voltage

Power Good Output

Enable Input

Valley Current Limit at 0.64 A Typical

Precision Internal Voltage Reference

Low I_QShutdown (<10 µA)

Highly Efficient Operation

Thermal Shutdown

12-Bump 2 mm x 2 mm DSBGA and 12-pin 4

mm x 4 mm WSON Packages

4.5V - 50V

Input

VIN

VCC

R_EN

R_ON

LM34919C

BST

RON

V_OUT

R_PGD

PGD

V_OUT

PGD

ISEN

RTN

SGND

Figure 1. Basic Step Down Regulator

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.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...29

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