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A5970D_08 Datasheet

  • A5970D_08

  • Up to 1 A step down switching regulator for automotive appli...

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  • STMICROELECTRONICS   STMICROELECTRONICS

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A5970D
Up to 1 A step down switching regulator
for automotive applications
Features
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Qualified following the AEC-Q100
requirements (temperature grade 3),
see PPAP for more details.
Up to 1 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
Inhibit for zero current consumption
Synchronization
Protection against feedback disconnection
Thermal shutdown
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 R
DS(on)
of 250 m惟) 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.
SO-8
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Description
Applications
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Dedicated to automotive applications
Application schematic
Figure 1.
L1 33uH
VIN=4.4V to 35V
VCC
COMP
C4
C1
10uF
35V
CERAMIC
C3
220pF
R3
4k7
22nF
8
4
1
2
OUT
SYNCH
Vout=3.3V
A5970D
FB
6
5
7
GND
INH
3
D1
STPS340U
R1
5k6
C2
100uF
10V
R2
3k3
VREF
3.3V
August 2008
Rev 4
1/12
www.st.com
1

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