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STMicroelectronics - 1.5A switch step down switching regulator

Numéro de référence A5970D
Description 1.5A switch step down switching regulator
Fabricant STMicroelectronics 
Logo STMicroelectronics 





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A5970D fiche technique
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A5970D
1.5A switch step down switching regulator
for automotive applications
Features
Qualified following the AEC-Q100
requirements (temperature Grade 3),
see PPAP for more details.
Temperature range -40 °C to 85 °C
Up to 1 A DC output current
Operating input voltage from 4.4 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
Inhibit for zero current consumption
Synchronization
Protection against feedback disconnection
Thermal shutdown
Applications
Dedicated to automotive applications
SO-8
Description
The A5970D is a step down monolithic power
switching regulator capable to deliver up to 1 A at
output voltages from 1.2 V to 35 V.
The device uses an internal P-channel D-MOS
transistor (with a typical Rdson of 250 m) 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 4.4 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.
Figure 1. Typical application
VIN=4.4V to 35V
C1
10uF
35V
CERAMIC
C4
22nF
C3
220pF
VCC
8
COMP
4
6
R3 VREF
4k7 3.3V
OUT
1
A5970D
7
SYNCH
2
FB
5
3
GND INH
L1 33uH
D1
STPS340U
Vout=3.3V
R1
5k6
C2
100uF
10V
R2
3k3
October 2007
Rev 2
1/13
www.st.com
1

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