Diodes Incorporated
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3A 27V Synchronous Buck Converter

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The LSP5523 is a monolithic synchronous buck regulator. The device integrates 90mΩ MOSFETS that provide
3A continuous load current over a wide operating input voltage of 4.5V to 27V. Current mode control provides
fast transient response and cycle-by-cycle current limit. An adjustable soft-start prevents inrush current at turn on.


  • 3A Output Current
  • Wide 4.5V to 27V Operating Input Range
  • Fixed 340KHZ Frequency
  • Integrated Power MOSFET Switches
  • Output Adjustable from 0.925V to 0.8Vin
  • Up to 93% Efficiency
  • Programmable Soft-Start
  • Stable with Low ESR Ceramic Output Capacitors
  • Cycle by Cycle Over Current Protection
  • Short Circuit Protection
  • Input Under Voltage Lockout
  • Package: ESOP-8L
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device 


  • Distributed power systems
  • Networking systems
  • FPGA, DSP, ASIC power supplies
  • Green electronics/ appliances
  • Notebook computers

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Type Buck
Minimum Input Voltage (V) 4.5
Maximum Input Voltage (V) 27
Output Current (A) 3
Minimum Output Voltage (V) 0.925
Maximum Output Voltage (V) 0.8Vin
Quiescent Current Typ (µA) 1300
Shutdown Current Typ (µA) 0.3
Frequency Typ (kHz) 340
HS RDS(ON) (mΩ) 90
LS RDS(ON) (mΩ) 70

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