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L5970D

Up to 1 A step down switching regulator
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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.

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Errata Sheet
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Datasheet

Key Features

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

Design Resources

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Technical Documentation

Product Specifications

Description Version Size
pdf
DS2027: Up to 1A step down switching regulator
16.2 280 KB

Application Notes

Description Version Size
pdf
AN1330: Designing with the L5970D 1A high efficiency DC-DC converter
3.1 882 KB
pdf
AN2259: High intensity LED driver using the L5970D/L5973D
1.6 308 KB

Design Notes & Tips

Description Version Size
pdf
DN0011: ST1S03 alternative topology: Using a buck in a negative buck-boost configuration
1.0 359 KB

Sample & Buy

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Part Number Marketing StatusPackagePacking TypeAutomotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
L5970DActiveSO-8Tube_-.952Distributor reported inventory date: 2015-09-04
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA16152000
P&SOrder NowASIA/PACIFIC951
ANGLIA LiveOrder NowEUROPE21811
ARROWOrder NowEUROPE480950
Farnell Element14Order NowEUROPE8731
RS COMPONENTSOrder NowEUROPE26005
RUTRONIKOrder NowEUROPE500100
DIGIKEYOrder NowWORLDWIDE5801
FUTUREOrder NowWORLDWIDE27861
MOUSEROrder NowWORLDWIDE6681
Ecopack2 (**)PDF
XML
L5970D013TRActiveSO-8Tape And Reel_Free Samples.952Distributor reported inventory date: 2015-09-04
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA47282500
P&SOrder NowASIA/PACIFIC501
Farnell Element14Order NowEUROPE298091
RS COMPONENTSOrder NowEUROPE8951
DIGIKEYOrder NowWORLDWIDE33001
MOUSEROrder NowWORLDWIDE58391
Ecopack2 (**)PDF
XML

(*) 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
(**) 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.
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