B5973D datasheet(1/12 Pages) STMICROELECTRONICS

Teilenummer	B5973D

Bauteilbeschribung	2 A step down switching regulator for automotive applications

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

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August 2008

Rev 3

1/11

1

B5973D

2 A step down switching regulator

for automotive applications

Features

■ Qualified following the AEC-Q100

requirements (temperature Grade 1), see

PPAP for more details.

■ 2 A DC output current

■ Operating input voltage from 4 V to 36 V

■ 3.3 V / (±2 %) reference voltage

■ 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

Description

The B5973D is a step down monolithic power

switching regulator with a minimum switch current

limit of 2.25 A so it is able to deliver up to 2 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 high current level is also

achieved thanks to an SO8 package with exposed

frame, that allows to reduce the Rth(JA) down to

approximately 40 °C/W. The device uses an

internal P-channel DMOS transistor (with a typical

RDSon of 250 mΩ) 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 4V

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. Pulse by pulse current

limit with the internal frequency modulation offers

an effective constant current short circuit

protection.

HSOP8 exposed pad

Figure 1.

Typical application

OUT

FB

GND

COMP

VCC

VIN=4V to 35V

A5973D

C1

10uF

35V

CERAMIC

C2

330uF

6.3V

C3

220pF

C4

22nF

R1

5k6

R2

3k3

R3

4k7

D1

STPS340U

L1 15uH

Vout=3.3V

1

2

3

4

5

6

7

8

INH

SYNCH

VREF

3.3V

OUT

FB

GND

COMP

VCC

VIN=4V to 35V

A5973D

C1

10uF

35V

CERAMIC

C2

330uF

6.3V

C3

220pF

C4

22nF

R1

5k6

R2

3k3

R3

4k7

D1

STPS340U

L1 15uH

Vout=3.3V

1

2

3

4

5

6

7

8

INH

SYNCH

VREF

3.3V

B

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