MC33680

http://onsemi.com

4

PIN FUNCTION DESCRIPTION

Pin

No.

Function

Type/Direction

Description

1

VMAINFB

Analog / Input

Feedback pin for VMAIN

2

VBAT

Power

Main battery supply

3

VBAT

Power

Main battery supply

4

VDD

Analog / Output

Connect to decoupling capacitor for internal logic supply

5

PDELAY

Analog / Input

Capacitor connection for defining Power−On signal delay

6

VREF

Analog / Output

Bandgap Reference output voltage. Nominal voltage is 1.25V

7

AGND

Analog Ground

8

IREF

Analog / Input

Resistor connection for defining internal current bias and PDELAY current

9

LOWBATSEN

Analog / Input

Resistive network connection for defining low battery detect threshold

10

DGND

Digital Ground

11

PORB

CMOS / Output

Active LOW Power−On reset signal

12

LOWBATB

CMOS / Output

Active LOW low battery detect output

13

LIBATON

CMOS / Input

microprocessor control signal for Lithium battery backup switch, the switch is

ON when LIBATON=HIGH and LIBATCL=HIGH

14

LIBATCL

CMOS / Input

microprocessor control signal for Lithium battery backup switch, if it is HIGH,

the switch is controlled by LIBATON, otherwise, controlled by internal logic

15

DGND

Digital Ground

16

NC

no connection

17

VAUXEN

CMOS / Input

VAUX enable, Active high

18

VAUXFBP

Analog / Input

Feedback pin for VAUX

19

NC

no connection

20

VAUXFBN

Analog / Input

Feedback pin for VAUX

21

VAUXBDV

Power

VAUX BJT base drive circuit power supply

22

VAUXCHG

Analog / Output

test pin

23

VAUXBASE

Analog / Output

test pin

24

NC

no connection

25

VAUXSW

Analog / Output

Collector output of the VAUX power BJT

26

VAUXEMR

Analog / Output

Emitter output of the VAUX power BJT

27

LIBATIN

Analog / Input

Lithium battery input for backup purposes

28

LIBATOUT

Analog / Output

Lithium battery output

29

NC

no connection

30

VMAINGND

Power Ground

Ground for VMAIN low side switch

31

VMAINSW

Analog / Input

VMAIN inductor connection

32

VMAIN

Analog / Output

VMAIN output