BL9315 Power Management IC – 3A Synchronous DC/DC Buck Converter | 2.5–5.5V, 1.5MHz, ESOP8

The BL9315 is a high-efficiency Power Management IC integrating a synchronous DC/DC step-down (buck) converter with a built-in MOSFET, designed for low-voltage, high-current applications requiring compact size and excellent efficiency.
It supports a 2.5V to 5.5V input voltage range and provides an adjustable output voltage via a 0.6V feedback reference, making it ideal for portable and consumer electronic devices.

Delivering up to 3A output current, the BL9315 operates at a 1.5MHz switching frequency, enabling the use of small external components and compact PCB layouts.
With a low 40µA quiescent current and efficiency up to 95%, it is well suited for battery-powered and always-on systems.

Key Specifications

• Input Voltage (VIN): 2.5V – 5.5V

• Output Voltage (VOUT): Adjustable (VFB = 0.6V)

• Output Current (IOUT): Up to 3A

• Quiescent Current (IQ): 40µA (typ.)

• Switching Frequency (FOSC): 1.5MHz

• Topology: Synchronous Buck Converter

• Power Switching: Built-in MOSFET

• Efficiency: Up to 95%

• Output Accuracy: ±2%

• Package: ESOP8

Applications

• Digital cameras

• Set-top boxes (STB)

• Portable consumer electronics

• Battery-powered devices

• Embedded low-voltage power rails

Features

• High-current output up to 3A

• Ultra-low quiescent current for extended battery life

• 1.5MHz high-frequency operation for compact designs

• Integrated synchronous MOSFETs

• High efficiency up to 95%

• ESOP8 package for space-constrained layouts