Up to 1 A step down switching regulator

The L5970D is a step down monolithic power switching regulator capable to deliver up to 1A at output voltages from 1.2V to 35V.

The device uses an internal P-Channel D-MOS transistor (with a typical Rdson of 250mΩ) as switching element to minimize the size of the external components.

An internal oscillator fixes the switching frequency at 250KHz.

Having a minimum input voltage of 4.4V only, it is particularly suitable for 5V bus, available in all computer related applications.

Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection.

Key Features

  • Inhibit for zero current consumption
  • Internal current limiting
  • Protection against feedback disconnection
  • Synchronization
  • Thermal shutdown
  • Voltage feedforward
  • 250KHz Internally fixed frequency
  • Up to 1A output current
  • 3.3V / (±2%) reference voltage
  • Operating input voltage from 4.4V to 36V
  • Low dropout operation: 100% duty cycle
  • Zero load current operation
  • Output voltage adjustable from 1.2V to 35V


Technical Documentation

Product Specifications
Description Version Size
DS2027 DS2027: Up to 1A step down switching regulator 16.2 279 KB
Application Notes
Description Version Size
AN1330 AN1330: Designing with the L5970D 1A high efficiency DC-DC converter 3.1 882 KB
AN2259 AN2259: High intensity LED driver using the L5970D/L5973D 1.6 307 KB
Design Notes & Tips
Description Version Size
DN0011 DN0011: ST1S03 alternative topology: Using a buck in a negative buck-boost configuration 1.1 359 KB

HW Model, CAD Libraries & SVD

HW Model, CAD Libraries & SVD
Description Version Size
X597X Pspice model 3 MB

Publications and Collaterals

Description Version Size
Brochure Power management guide 09.2017 3 MB
eDesignSuite Support & Community

Sample & Buy

Part Number Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
L5970D013TR SO-8 Tape And Reel Active 0.959 1000 NEC EAR99 CHINA MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L5970D013TR ActiveSO-8IndustrialEcopack2 (**) 0 0
L5970D ActiveSO-8IndustrialEcopack2 (**) 0 0

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.