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ABSOLUTE MAXIMUM RATINGS

(1)

CONNECTION DIAGRAMS

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

V+

BUCK

SRC

SS

RAMP

CEAO

CSAO

CSA+

CSA−

VEAO

GND

CEA+

PUSH

VCC

PULL

PGND

DELAY

SYNC

CT

RT

VEA−

REF

VEA+

CEA−

N, J OR DW PACKAGES

(TOP VIEW)

3 2 1

13 14

5

6

7

8

9

10

11

PGND

NC

NC

DELAY

SYNC

CT

RT

SS

RAMP

CEAO

CSAO

CSA+

CSA−

VEAO

4

15 16 17 18

Q PACKAGE

(TOP VIEW)

28 27 26

25

24

23

22

21

20

19

12

NC − No internal connection

UC1827-1, UC1827-2

UC2827-1, UC2827-2

UC3827-1, UC3827-2

SLUS365A – APRIL 1999 – REVISED AUGUST 2005

UC2827-1

UC2827-2

UNITS

UC3827-1

UC3827-2

Supply voltage, VCC

20

CEAO, CEA+, CEA-, CSAO, CSA+, CSA-, CT, DELAY, PUSH, PULL,

–0.3 to 5

RAMP, RT, SS, SYNC, VEA+, VEAO,

V

Input voltage range

V+ and BUCK

90

SRC

90-VCC

I/O continuous

±250

mA

BUCK driver

I/O peak

±1

A

I/O continuous

±200

mA

PUSH/PULL driver

I/O peak

±0.8

A

Storage temperature

–65 to 150

Junction temperature

–55 to 150

°C

Lead temperature (soldering, 10 sec)

300

(1)

Voltages are referenced to ground. Currents are positive into, negative out of the specified terminal. Consult Packaging section of

databook for thermal limitations and considerations of packages.

PLCC-28 (Q PACKAGE)

(TOP VIEW)

DIL-24 (N or J, DW PACKAGES)

(TOP VIEW)

3