UCC2974

UCC3974

SLUS485A – JULY 2001 – REVISED NOVEMBER 2001

2

www.ti.com

Supply voltage range,

VBAT

27 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range,

BUCK

–5 V to VBAT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MODE

–0.3 V to 4.3 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mode maximum forced current

300

µA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–55

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds

260

°C

. . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

‡ Unless otherwise specified, all voltages are with respect to GND.

AVAILABLE OPTIONS

T

PACKAGE

TJ

PW§ (SSOP)

–40

_C to 85_C

UCC2974PW

0

_C to 70_C

UCC3974PW

§ This package is available taped and reeled. To

order this packaging option, add an R suffix to

the part number. (e.g. UCC2974PWR)

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

DERATING FACTOR

TA = 70°C

TA = 85°C

16-pin PW with solder

775 mW

6.2 mW/

°C

495 mW

402 mW

recommended operating conditions

MIN

NOM

MAX

UNIT

Supply voltage, VIN

4.5

25

V

Mode voltage

0

4.3

V

DIM voltage

0

3.5

V

LFDSYNC amplitude

0

4.5

V

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

OUT1

VIN

BUCK1

COMP1

FB1

RC

RD

DIM

OUT2

GND

BUCK2

CBP

COMP2

FB2

MODE

LFDSYNC

UCC2974

PW PACKAGE

(TOP VIEW)

ACTUAL SIZE

(5,10mm x 6,60mm)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

OUT1

VIN

BUCK1

COMP1

FB1

RC

RD

DIM

OUT2

GND

BUCK2

CBP

COMP2

FB2

MODE

LFDSYNC

UCC3974

PW PACKAGE

(TOP VIEW)