BL8028 Power Management IC – 1.5A DC-DC Step-Down Converter | 2.6–5.5V Synchronous Buck

The BL8028 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 low power consumption and stable output regulation.
It supports a wide 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 BL8028 achieves up to 97% efficiency while maintaining an ultra-low 80µA quiescent current, making it ideal for portable and always-on devices.
With a 2MHz switching frequency, 100% duty cycle, and compact SOT23-5 and DFN packages, it enables small solution size and high integration 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 1.5A

• 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, DFN2×2-6, DFN1.6×1.6-6L

Applications

• Mobile phones and handheld devices

• Set-top boxes (STB)

• Portable consumer electronics

• Battery-powered systems

• Embedded and IoT power rails

• General-purpose low-voltage DC/DC conversion

Features

• High-efficiency synchronous buck architecture

• Ultra-low quiescent current for extended battery life

• Automatic PWM/PFM mode for light-load efficiency

• 2MHz switching frequency for compact external components

• 100% duty cycle support

• Small SMD packages for space-constrained designs

• High output accuracy and stable regulation