LM34919BTLSLASHNOPB.A中文资料德州仪器数据手册PDF规格书

1FEATURES

2• AEC-Q100 Grade 1 Qualified (-40°C to 125°C)

• Maximum Switching Frequency: 2.6 MHz

(VIN=14V,Vo=3.3V)

• Input Voltage Range: 6V to 40V

• Integrated N-Channel Buck Switch

• Integrated Startup Regulator

• No loop compensation Required

• Ultra-Fast transient Response

• Operating frequency remains constant with

Load Current and Input Voltage

• Maximum Duty Cycle Limited During Startup

• Adjustable Output Voltage

• Valley Current Limit At 0.64A

• Precision Internal Reference

• Low Bias Current

• Highly Efficient Operation

• Thermal Shutdown

• 10-Pin DSBGA Package

TYPICAL APPLICATIONS

• Automotive Safety and Infotainment

• High Efficiency Point-Of-Load (POL) Regulator

• Non-Isolated Telecommunication Buck

Regulator

• Secondary High Voltage Post Regulator

DESCRIPTION

The LM34919B Step-Down Switching Regulator features all of the functions needed to implement a

low cost, efficient, buck bias regulator capable of

supplying 0.6A to the load. This buck regulator

contains an N-Channel Buck Switch, and is available

in a 10-pin DSBGA package. 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: VCC

under-voltage lockout, thermal shutdown, gate drive

under-voltage lockout, and maximum duty cycle

limiter.