2

UCC1972/3

UCC2972/3

UCC3972/3

TSSOP-8 (TOP VIEW)

PW Package

ABSOLUTE MAXIMUM RATINGS

VBAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +27V

VDD Maximum Forced Current . . . . . . . . . . . . . . . . . . . . 30mA

Maximum Forced Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 17V

BUCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –5V to VBAT

MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 4.0V

MODE Maximum Forced Current . . . . . . . . . . . . . . . . . . 300

µA

Operating Junction Temperature . . . . . . . . . . –55°C to +150°C

Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C

Unless otherwise indicated, currents are positive into, negative

out of the specified terminal. Pulse is defined as less than 10%

duty cycle with a maximum duration of 500

aging Section of Databook for thermal limitations and consider-

ations of packages. All voltages are referenced to GND.

CONNECTION DIAGRAMS

MODE=OPEN. For any tests with VBAT>17V, place a 1k resistor from VBAT to VDD.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Input supply

VDD Supply Current

VDD = 12V

1

1.5

mA

VBAT = 25V

7

10.5

mA

VBAT Supply Current

VBAT = 12V

30

60

VBAT = 25V

70

140

VDD Regulator Turn-on Voltage

17

18

19

V

VDD UVLO Threshold

Low to high

3.6

4

4.4

V

UVLO Threshold Hysteresis

100

200

300

mV

Output Section

Pull Down Resistance

25

50

Ω

Pull Up Resistance

25

50

Ω

Output Clamp Voltage

VBAT = 25V, Shunt Regulator on

16

18

V

Output Low

0.05

0.2

V

Rise Time

CL = 1nF, Note 1

200

ns

Fall Time

CL = 1nF, Note 1

200

ns

FB

MODE

GND

COMP

VDD

OUT

BUCK

VBAT

1

2

3

4

8

7

6

5

DIL-8 (TOP VIEW)

J, N Packages