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Qualified following the AEC-Q100

requirements (temperature Grade 3),

see PPAP for more details.

Temperature range -40

擄C

to 85

擄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

鈻?/div>

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鈩? 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

鈻?/div>

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

型號

版本

描述

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