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ST1S40IDR

ST1S40IDR

ST1S40IPUR

Active

3 A DC step-down switching regulator

Quantity $ per Unit Savings
1 - 9$2.680%
10 - 24$2.4110%
25 - 99$2.2715%
100 - 249$1.9428%
250 - 400$1.8133%
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Out of stock
$2.69
Parameter NameParameter Value
Input Voltage Min Volt4.0
Input Voltage Max Volt18.0
ECCN USEAR99
ECCN EUNEC
Packing TypeTape And Reel
RoHs compliantEcopack2
GradeIndustrial
Package NameDFN8 4x4

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.

Key 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