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AST1S31HF

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Up to 4 V, 3 A step-down 2.3 MHz switching regulator for automotive applications

Quantity $ per Unit Savings
1 - 9$4.050%
10 - 24$3.6410%
25 - 99$3.4415%
100 - 249$2.9826%
250 - 499$2.8230%
500$2.5437%
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$4.05
Parameter NameParameter Value
Input Voltage Min Volt2.8
Input Voltage Max Volt4.0
ECCN USEAR99
ECCN EUNEC
Packing TypeTape And Reel
RoHs compliantEcopack1
GradeAutomotive
Package NameVFDFPN 8 3x3x1.0

The AST1S31HF is an internally compensated 2.3 MHz fixed frequency PWM synchronous step-down regulator. The AST1S31HF operates from 2.8 V to 4 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.


The AST1S31HF device integrates a 70 mΩ high-side switch and a 55 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.


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


The AST1S31HF is available in a 3 mm x 3 mm, 8-lead VFDFPN package.

Key features
  • AECQ100 qualified
  • 3 A DC output current
  • 2.8 V to 4 V input voltage
  • Output voltage adjustable from 0.8 V
  • 2.3 MHz switching frequency
  • Internal soft-start and enable
  • Integrated 70 mΩ and 55 mΩ power MOSFETs
  • All ceramic capacitor
  • Power Good (POR)
  • Cycle-by-cycle current limiting
  • Current foldback short-circuit protection
  • VFDFPN 3 x 3 - 8L package