ST1S40

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3 A DC step-down switching regulator

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Product overview

Description

The ST1S40 is an internally compensated 850 kHz fixed-frequency PWM synchronous step-down regulator. ST1S40 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.

The ST1S40 integrates a 95 mΩ high side switch and 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.

The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.

The ST1S40 is available in VFQFPN 4 mm x 4 mm 8 lead package, HSOP-8 and standard SO-8 package.

  • All features

    • 3 A DC output current
    • 4.0 V to 18 V input voltage
    • Output voltage adjustable from 0.8 V
    • 850 kHz switching frequency
    • Internal soft-start
    • Integrated 95 mΩ and 69 mΩ Power MOSFETs
    • All ceramic capacitor
    • Enable
    • Cycle-by-cycle current limiting
    • Current fold back short-circuit protection
    • VFQFPN4x4-8L, HSOP-8, and SO-8 and packages

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STMicroelectronics - ST1S40

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
ST1S40IDR
Active
SO-8 Industrial Ecopack2
ST1S40IPHR
Active
PowerSO-8 Industrial Ecopack2
ST1S40IPUR
Active
DFN8 4x4 Industrial Ecopack2

ST1S40IDR

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

ST1S40IPHR

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

ST1S40IPUR

Package:

DFN8 4x4

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN8 4x4

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) 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.

Sample & Buy

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Part Number
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ECCN (US)
ECCN (EU)
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Package
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ST1S40IPHR Available at distributors

Distributor availability of ST1S40IPHR

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Distributor reported inventory date:

No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel PowerSO-8 - - PHILIPPINES
ST1S40IDR Available at distributors

Distributor availability of ST1S40IDR

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No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel SO-8 - - CHINA
ST1S40IPUR Available at distributors

Distributor availability of ST1S40IPUR

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel DFN8 4x4 - - MALAYSIA

ST1S40IPHR Active

Package:
PowerSO-8
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

ST1S40IPHR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-

Max:

-

Country of Origin:

PHILIPPINES

Distributor Name

Distributor reported inventory date:

ST1S40IDR Active

Package:
SO-8
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

ST1S40IDR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-

Max:

-

Country of Origin:

CHINA

Distributor Name

Distributor reported inventory date:

ST1S40IPUR Active

Package:
DFN8 4x4
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

ST1S40IPUR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-

Max:

-

Country of Origin:

MALAYSIA

Distributor Name

Distributor reported inventory date:

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