BLL2771 Power Management IC – 4A Synchronous CC DC/DC Buck Converter | 7–70V, 150kHz, QFN5×5-14L

The BLL2771 is a high-performance Power Management IC featuring a built-in MOSFET synchronous DC/DC step-down (buck) converter with constant-current (CC) control.
It supports a 7V to 70V input voltage range, making it ideal for automotive car lighting and high-voltage DC/DC applications.

Capable of delivering up to 4A output current, the BLL2771 achieves 93% efficiency with a 92% maximum duty cycle, providing stable and reliable power for automotive lighting systems.
Its QFN5×5-14L package allows compact, high-density PCB integration in automotive designs.

Key Specifications

• Input Voltage (VIN): 7V – 70V

• Output Voltage (VOUT): Adjustable

• Output Current (IOUT): Up to 4A

• Switching Frequency (FOSC): 150kHz

• Topology: Synchronous Constant-Current (CC) Buck Converter

• Power Switching: Built-in MOSFETs

• Efficiency: Up to 93%

• Max Duty Cycle: 92%

• Output Accuracy: ±3%

• Package: QFN5×5-14L

Applications

• Automotive car lights

• High-voltage DC/DC automotive modules

• Embedded automotive electronics

• Battery-powered automotive systems

Features

• Constant-current control for automotive lighting applications

• High-current output up to 4A

• Integrated MOSFETs for compact design

• Wide input voltage range 7–70V

• High efficiency up to 93%

• QFN5×5-14L package for space-efficient PCB layouts