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Up to 4 V, 3 A step-down 1.5 MHz switching regulator for automotive applications

Quantity $ per Unit Savings
1 - 9$3.650%
10 - 20$3.329%
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In stock
Parameter NameParameter Value
Input Voltage Min Volt2.8
Input Voltage Max Volt4.0
Packing TypeTape And Reel
RoHs compliantEcopack2
Package NameVFDFPN 8 3x3x1.0

The AST1S31 device is an internally compensated 1.5 MHz fixed-frequency PWM synchronous step-down regulator. The AST1S31 device 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 AST1S31 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 an internal compensation deliver a very compact solution with a minimum component count.

The AST1S31 device is available in a 3 x 3 mm, 8 leads VFDFPN package.

Key features
  • AECQ100 qualification
  • 3 A DC output current
  • 2.8 V to 4 V input voltage
  • Output voltage adjustable from 0.8 V
  • 1.5 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