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Qualified following the AEC-Q100

requirements (temperature grade 3), see

PPAP for more details.

1 A DC output current

Operating input voltage from 4 V to 36 V

3.3 V / (鹵2 %) reference voltage

Output voltage adjustable from 1.235 V to 35 V

Low dropout operation: 100 % duty cycle

500 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 A5970AD is a step down monolithic power

switching regulator with a switch current limit of

1.35 A so it is able to deliver more than 1 A DC

current to the load depending on the application

conditions.

The output voltage can be set from 1.235 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 avoid the use of

bootstrap capacitor and guarantee high efficiency.

An internal oscillator fixes the switching frequency

at 500 kHz to minimize the size of external

components. Having a minimum input voltage of

4 V only, it is particularly suitable for 5 V bus,

available in all computer related applications.

Pulse by pulse current limit with the internal

frequency modulation offers an effective constant

current short circuit protection.

SO-8

鈻?/div>

Description

Applications

鈻?/div>

Dedicated to automotive applications

Figure 1.

Application schematic

L1 15uH

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

A5970AD

FB

6

5

7

GND

INH

3

D1

STPS340U

R1

5k6

C2

100uF

10V

R2

3k3

VREF

3.3V

August 2008

Rev 2

1/16

www.st.com

1

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