en

Cart

Your cart is empty.

IC reference design search

STMicroelectronics AST1S31

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

Overview

TopologyBuck Converter
Input voltage2.8-4 V
Switching frequency1200-1900 kHz
Output 13.3 V / 3 A
IC revision5

Description

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.

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

Typical applications

  • Designed for automotive systems / Car body applications
  • Battery powered applications

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersionLR
(µH)
RDC
(mΩ)
Material Samples
744770015
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 1.5 10 12 5 6 42 1280 Standard
744310150
STE ALT EAG CAD LTS PSP SPE IGS CADWE-HCI SMT Flat Wire High Current Inductor 1.5 7.5 12 13.97 80 7030 SMT 1.25 12.7 Superflux
744310200
STE ALT EAG CAD LTS PSP SPE IGS CADWE-HCI SMT Flat Wire High Current Inductor 2 6.5 9 15.62 58 7030 SMT 1.55 14.2 Superflux
74477002
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 2.4 10.1 14.3 9 12 41 1280 Standard
74477003
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 3.5 8.9 9.6 11 14 37.5 1280 Standard
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersionLR
(µH)
RDC
(mΩ)
Material Samples