UCC3923, UCC3924, UCC3925, UCC3926, UCC3927, UCC3928

HIGHVOLTAGE HOT SWAP POWER MANAGER

SLUS471 – NOVEMBER 2000

2

POST OFFICE BOX 655303

functional block diagram

UDG–00151

+

+

R

SQ

Q

R

+

+

8

9

13

6

4

20

1

99 R

+

+

3

2

19

+

+

+

+

+

3 V

2 V

1 V

0 V

12

11

14

15

16

17

18

10

5

ON

INSA

UVLO

REF

OVLO

–VIN

IRAMP

FLTTIME

SEQTIME

FAULT

ISENS

GATE

PG1

PG2

PG3

PG4

PG5

DRAINSENS

GND

INSB

+

5 V

1.25 V

1.4 V

4V

1.5 V

TIMER

LOAD

7

4 V

‡ 20-pin package shown. Pin numbers are for counting purposes only, Actual pin locations are dependent upon customer requirements and

precedence of other products.

DETAILED OPTION MATRIX

PIN NAME

DESCRIPTION

UCC3923

UCC3924

UCC3925

UCC3926

UCC3927

UCC3928

UVLO

Undervoltage input

X

X

X

X

OVLO

Overvoltage input

X

X

PGx

PG output(s)

1

5

1

5

REF

Reference output

X

X

X

X

INSA, INSB

Insert detect

X

X

X

X

DRAINSENS

Power good detection input

X

X

X

X

SEQTIME

Programming for downstream load sequencing

X

X

8–Pin TSSOP

X

X

Packages

14–Pin TSSOP

X

X

ac ages

20–Pin TSSOP

X

X