BL8039 Power Management IC – 2A Synchronous DC-DC Buck Converter | 2.6–5.5V Input, Adjustable Output

The BL8039 is a high-efficiency synchronous DC/DC step-down (buck) converter with a built-in power MOSFET, designed for compact and battery-powered applications requiring stable output regulation and high load capability.
It supports a 2.6V to 5.5V input voltage range and provides an adjustable output voltage via a 0.6V feedback reference.

Operating in PWM/PFM automatic switching mode, the BL8039 achieves up to 97% efficiency while maintaining a low 80µA quiescent current, making it suitable for portable and always-on devices.
With a 2MHz switching frequency, 100% duty cycle, and compact SOT23-5 and DFN1.6×1.6-6L packages, it enables small solution size and high power density for modern power designs.

Key Specifications

• Input Voltage (VIN): 2.6V – 5.5V

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

• Output Current (IOUT): Up to 2A

• Quiescent Current (IQ): 80µA (typ.)

• Switching Frequency (FOSC): 2MHz

• Efficiency: Up to 97%

• Max Duty Cycle: 100%

• Output Accuracy: ±2%

• Power Switching: Built-in MOSFET

• Operating Mode: Synchronous PWM / PFM

• Packages: SOT23-5, DFN1.6×1.6-6L

Applications

• Cell phones and handheld devices

• Set-top boxes (STB)

• Portable consumer electronics

• Battery-powered systems

• Embedded and IoT power rails

Features

• High-efficiency synchronous buck architecture

• Supports high output current up to 2A

• Automatic PWM/PFM mode for improved light-load efficiency

• 2MHz switching frequency for compact external components

• 100% duty cycle operation

• Small SMD packages for space-constrained designs

• High output accuracy and stable regulation