BL9342 Power Management IC – 0.6A High-Voltage Buck Converter | 4.2–40V, 1.8MHz, SOT23-6

The BL9342 is a compact Power Management IC featuring a built-in high-side MOSFET asynchronous DC/DC step-down (buck) converter, designed for high-voltage power conversion in compact systems.
It supports a wide 4.2V to 40V input voltage range and provides an adjustable output voltage via a 0.794V feedback reference, making it suitable for DPS and industrial power applications.

Capable of delivering up to 0.6A output current, the BL9342 operates at a high 1.8MHz switching frequency, enabling the use of very small inductors and capacitors.
Its low 200µA quiescent current and compact SOT23-6 package make it ideal for space-constrained, high-voltage designs.

Key Specifications

• Input Voltage (VIN): 4.2V – 40V

• Output Voltage (VOUT): Adjustable (VFB = 0.794V)

• Output Current (IOUT): Up to 0.6A

• Quiescent Current (IQ): 200µA

• Switching Frequency (FOSC): 1.8MHz

• Topology: Asynchronous Buck Converter

• Power Switching: Built-in High-Side MOSFET

• Efficiency: Up to 90%

• Output Accuracy: ±2%

• Package: SOT23-6

Applications

• High-voltage DC/DC power conversion

• DPS (Digital Power Supply)

• Industrial control systems

• Embedded power rails

• Automotive and battery-powered electronics

Features

• Wide input voltage range up to 40V

• High-frequency 1.8MHz operation for compact designs

• Built-in high-side MOSFET

• Low quiescent current

• Stable and accurate output regulation

• Small SOT23-6 package for space-constrained applications