A5970D, A5970D13TR

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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
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.

Applications

Dedicated to automotive applications Typical application

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

October 2007

Rev 2

1/13
www.st.com 1

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A5970D DATASHEET