A5972D_0808 Datasheet, PDF (1/11 Pages) STMicroelectronics – Up to 1.5 A step down switching regulator for automotive applications

A5972D
Up to 1.5 A step down switching regulator
for automotive applications
Features
■ Qualified following the AEC-Q100
requirements (temperature grade 3), see PPAP
for more details.
■ 1.5 A DC output current
■ Operating input voltage from 4 V to 36 V
■ Output voltage adjustable from 1.235 V to 35 V
■ Low dropout operation: 100 % duty cycle
■ 250 kHz Internally fixed frequency
■ Voltage feedforward
■ Zero load current operation
■ Internal current limiting
■ Protection against feedback disconnection
■ Thermal shutdown
Applications
■ Automotive applications
Figure 1. Application schematic
SO-8
Description
The A5972D is a step down monolithic power
switching regulator with a minimum switch current
limit of 1.8 A so it is able to deliver more than
1.5 A DC current to the load depending on the
application conditions.
The output voltage can be set from 1.235V to 35V.
The device uses an internal P-channel D-MOS
transistor (with a typical R_DS(on) of 250 mΩ) as
switching element to minimize the size of the
external components.
An internal oscillator fixes the switching frequency
at 250 kHz.
Having a minimum input voltage of 4 V only, it is
particularly suitable for 5 V bus.
Pulse by pulse current limit with the internal
frequency modulation offers an effective constant
current short circuit protection.
VIN=4.4V to 35V
VCC
OUT
C1
10uF
C4
22nF
COMP
A5972D
GND
FB
C3
220pF
4.7KΩ
R3
33uH
D1
STPS2L40U
V O U T = 3 .3 V
R1
5.6K
C2
100uF
R2
3.3K
August 2008
Rev 4
1/11
www.st.com
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