L4973 datasheet(3/27 Pages) STMICROELECTRONICS

Il numero della parte	L4973

Spiegazioni elettronici	3.5A step down switching regulator

PDF	27 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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3 / 27 page

L4973

Block diagram

3/27

Block diagram

Figure 2.

Block diagram

Pin settings

2.1

Pin connection

Figure 3.

Pin connection (top view)

VREF

GOOD

5.1V

COMP

VFB

SYNC

BOOT

DRIVER

HICCUP CURRENT

LIMITING

INTERNAL

REFERENCE

INH

ZERO CURRENT

INHIBIT

D94IN161B

3.3V

V5.1

E/A

SOFT

START

5.1V

3.3V

THERMAL

SHUTDOWN

INTERNAL

SUPPLY

5.1V

PWM

CURRENT

LIMITING

CBOOT

CHARGE

OSCILLATOR

OUT

GND

OSC

VCC

17(19)

11(12)

12(13)

18(20)

1(1)

2(2)

3(3)

9(10)

8(9)

7(8)

16(18)

10(11)

4,5,6,13,14,15

(4,5,6,7,14,15,16,17)

Pin x = Powerdip

Pin (x) = S020

OSC

OUT

GND

VCC

GND

VCC

BOOT

INH

VFB

COMP

GND

V5.1

SYNC

D94IN162A

OSC

OUT

GND

VCC

VFB

COMP

GND

V5.1

SYNC

BOOT

INH

D94IN163A

DIP -18 (12+3+3)

SO20 (12+4+4)

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