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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
AN1891: Application ideas: driving LEDs using L497x, L597x, L692x DC-DC converters families
2.2 300 KB
pdf
AN2259: High intensity LED driver using the L5970D/L5973D
1.6 308 KB

User Manual

Description Version Size
pdf
UM0432: Low voltage motor control demonstration board based on ST7MC MCU
2.2 906 KB
pdf
UM0674: STEVAL-ISA054V1, 100 W SMPS based on the STW9N150 Power MOSFET and UC3844B for industrial applications
1.1 1,374 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: 2014-09-02
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA2011000
P&SOrder NowASIA/PACIFIC1001
ANGLIA LiveOrder NowEUROPE701
ARROWOrder NowEUROPE145550
Farnell Element14Order NowEUROPE10991
RS COMPONENTSOrder NowEUROPE4355
RUTRONIKOrder NowEUROPE5600100
DIGIKEYOrder NowWORLDWIDE9241
FUTUREOrder NowWORLDWIDE19231
MOUSEROrder NowWORLDWIDE19981
Ecopack2 (**)PDF
XML
L5970D013TRActiveSO-8Tape And Reel_Free Samples.952Distributor reported inventory date: 2014-09-02
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA98482500
ARROWOrder NowEUROPE75000
Farnell Element14Order NowEUROPE21511
RS COMPONENTSOrder NowEUROPE17171
RUTRONIKOrder NowEUROPE100002500
DIGIKEYOrder NowWORLDWIDE20861
FUTUREOrder NowWORLDWIDE25002500
MOUSEROrder NowWORLDWIDE36691
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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