UCC3918

LOW ONRESISTANCE HOT SWAP POWER MANAGER

SLUS384B – NOVEMBER 1999 – REVISED JUNE 2000

2

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functional block diagram

9

8

5

4

13

12

10

6

7

3

2

1

INTERNAL

BIAS

THERMAL

SHUTDOWN

ON TIME

CONTROL

3% DUTY

CYCLE

CHARGE

PUMP

16

15

14

VIN

VIN

VIN

VOUT

VOUT

VOUT

SHTDWN

FAULT

CT

HEAT SINK GND

PINS

GND

IFAULT

IMAX

CURRENT

FAULT LEVEL

OVERLOAD

COMPARATOR

OVERCURRENT

COMPARATOR

REVERSE

COMPARATOR

V

OUT

+

20mV

CURRENT SENSE

1.5V

H = OPEN

MAXIMUM

CURRENT

LEVEL

+

+

+

+

+

+

UDG–99153

Input Voltage

8 V

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

SOIC Power dissipation

2.5 W

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

Fault output sink current

50 mA

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

Fault output voltage

VIN

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

Output Current (dc)

Internally Limited

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

Input Voltage

SHTDWN, IFAULT, IMAX

–0.3 V to VIN

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

–65

_C to 150_C

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

–55

_C to 150_C

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

Lead temperature (soldering, 10 seconds)

300

_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 indicated, voltages are reference to ground and currents are positive into, negative out of the specified terminal. Pulsed is

defined as a less than 10% duty cycle with a maximum duration of 500

µs. Consult Packaging Section of Databook for thermal limitations and

considerations of package.