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Manufacturer Part #


L5973D Series 36V 300 uA 280 kHz Buck SMT Switching Regulator - HSOP-8

Mfr. Name: STMicroelectronics
Standard Pkg:
Product Variant Information section
Date Code: 1845
Product Specification Section
Technical Attributes
Attributes Table
Topology: Buck
Input Voltage: 36V
Output Current-Max: 2.5A
Output Voltage Range: 1.235V to 35V
Output Type: Adjustable
Switching Frequency-Max: 280kHz
Operating Temp Range: -40°C to +150°C
Duty Cycle-Max: 100%
Efficiency: 90%
No. of Outputs: 1
Quiescent Current: 2.5mA
Storage Temperature Range: -55°C to +150°C
Load Regulation: 15mV
Package Style:  HSOP-8
Mounting Method: Surface Mount
Features & Applications
The L5973D013TR is a step down monolithic power switching regulator with a minimum switch current limit of 2.5 A so it is able to deliver more than 2 A DC current to the load depending on the application conditions.

The device uses an internal P-channel D-MOS transistor (with a typical Rdson of 250 mΩ) as
switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250 kHz.


  • 2.5 A internal switch
  • Operating input voltage from 4 V to 36 V
  • 3.3 V / (±2%) reference voltage
  • Output voltage adjustable from 1.235 V to 35 V
  • Low dropout operation: 100 % duty cycle
  • 250 kHz internally fixed frequency
  • Voltage feedforward
  • Zero load current operation
  • Internal current limiting
  • Inhibit for zero current consumption
  • Synchronization
  • Protection against feedback disconnection
  • Thermal shutdown


  • Consumer: STB, DVD, TV, VCR, car radio, LCD monitors
  • Networking: XDSL, modems, DC-DC modules
  • Computer: printers, audio/graphic cards, optical storage, hard disk drive
  • Industrial: changers, car battery, DC-DC converters

View the Complete family of L597 Switching Regulators

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