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BL9342BLB

Non-sync Buck DC-DC, 600mA, 4.2-40V input, 1.8MHz, SOT-23-6L

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Manufacturer Part：

BL9342BLB

Package：

SOT-23-6L (2.9×1.6×1.1 mm)

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Description

Product Overview

The BL9342BLB is a 40V, 600mA high-frequency step-down switching regulator from Shanghai Belling. It integrates an internal high-side power MOSFET with current mode control for fast loop response. Operating at 1.8 MHz switching frequency over a 4.2V to 40V input range, it is available in a compact SOT-23-6L package for space-constrained power conversion applications.

Key Specifications

Topology Non-synchronous Buck
Input Voltage Range 4.2V to 40V
Output Current 600 mA
Switching Frequency 1.8 MHz
Internal MOSFET RDS(ON) 500 mΩ
Reference Voltage 0.8V
Quiescent Current 200 µA (typical)
Shutdown Current 3 µA (typical)
Current Limit 1A
Operating Temperature -40°C to +125°C
Package SOT-23-6L

Features

  • Wide input voltage range: 4.2V to 40V
  • 1.8 MHz fixed switching frequency
  • Internal 500 mΩ high-side MOSFET
  • Internal soft-start (0.5 ms)
  • Precision current limit without sensing resistor
  • Thermal shutdown at 150°C
  • Internal compensation for easy design
  • Stable with ceramic output capacitors

Applications

  • High-voltage industrial power conversion
  • Power meter and smart grid equipment
  • Battery-powered system regulation
  • Automotive auxiliary power supplies
  • LED driver and general lighting

The BL9342BLB from Shanghai Belling is a high-frequency step-down switching regulator with integrated 500 mΩ high-side MOSFET. It supports input voltages from 4.2V to 40V and delivers up to 600 mA output. The 1.8 MHz switching frequency enables compact external components, while internal soft-start, compensation, and precision current limit simplify design. Its wide input range makes it suitable for industrial, automotive, and battery-powered applications.

The BL9342BLB operates as a current-mode non-synchronous buck converter. An internal high-side NMOS switch controls energy transfer to the output inductor, while an external Schottky diode acts as the freewheeling element. Current-mode control provides fast transient response and cycle-by-cycle current limiting. The error amplifier compares the FB pin voltage (sensed via external resistor divider) with the 0.8V internal reference to regulate the PWM duty cycle. Internal soft-start gradually ramps the output voltage. Frequency foldback at light loads maintains efficiency while thermal shutdown protects against overheating.

Pin Name Type Function
1 BST Input Bootstrap supply for high-side driver
2 GND Power Ground
3 FB Input Output feedback (Vout=0.8×(1+R1/R2))
4 EN Input Enable control (float to disable)
5 VIN Input Input supply (4.2-40V)
6 SW Output Switch node (connect to inductor and diode)
  • Industrial power systems requiring wide input voltage range
  • Smart meter and power grid equipment auxiliary power
  • Battery-powered systems with 12V/24V input rails
  • Automotive accessory power conversion
  • General lighting and LED driver buck regulation
Manufacturer Part Number Package Notes
TI LMR16006XDDCR SOT-23-6 600mA, 4-60V input, similar pinout
MPS MP8759 QFN-12 Higher current, wider input range
Monolithic Power MP4581DN SOIC-8 500mA, 4.5-55V input
onsemi NCP3170BDR2G SOIC-8 1A, 4.5-18V input
Belling BL9340BLB SOT-23-6L Higher current version
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

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Local pickup service is available for customers in Shenzhen and surrounding areas:
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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

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Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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