LM34919CQTLXSLASHNOPB.A中文资料德州仪器数据手册PDF规格书

1FEATURES

2• AEC-Q100 qualified (Tj = -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

• No Loop Compensation Required

• Ultra-Fast Transient Response

• 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 IQ Shutdown (<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

APPLICATIONS

• Automotive Safety and Infotainment

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

• Telecommunication Buck Regulator

• Secondary Side Post Regulator

DESCRIPTION

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.