UCC2915, UCC3915

15V PROGRAMMABLE HOT SWAP POWER MANAGER

SLUS198C – FEBUARY 2000 - REVISED - JUNE 2001

1

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

D Integrated 0.15-Ω Power MOSFET

D 7-V to 15-V Operation

D Digital-Programmable Current Limit from

0 A to 3 A

D 100-µA ICC When Disabled

D Programmable On Time

D Programmable Start Delay

D Fixed 2% Duty Cycle

D Thermal Shutdown

D Fault-Output Indicator

D Maximum-Output Current Can Be Set to 1 A

Above the Programmed-Fault Level or to a

Full 4 A

D Power SOIC and TSSOP, Low Thermal

Resistance Packaging

description

The UCC3915 programmable hot swap power manager provides complete power-management, hot-swap

capability, and circuit breaker functions. The only external component required to operate the device, other than

power supply bypassing, is the fault-timing capacitor, CT. All control and housekeeping functions are integrated,

and externally programmable. These include the fault current level, maximum output sourcing current,

maximum fault time, and startup delay. In the event of a constant fault, the internal fixed 2% duty cycle ratio limits

average output power.

The internal 4-bit DAC allows programming of the fault-level current from 0 A to 3 A with 0.25-A resolution. The

IMAX control pin sets the maximum-sourcing current to 1 A above the trip level or to a full 4 A of output current

for fast output capacitor charging. (continued)

block diagram

UDG-99174

6

7

8

9

1 A

ABOVE

FAULT

+

–

+

–

OVER CURRENT

COMPARATOR

CURRENT FAULT

LEVEL 0–3 A

10

H = 4 A

MAX

CURRENT

LEVEL

4 A

ON TIME

CONTROL

2% DUTY

CYCLE

0–3 A

0.25

RES

11

13

12

4

5

B3

B2

B1

B0

4 BIT DAC

GND

HEAT SINK

GND PINS

CT

CHARGE

PUMP

+

–

16

LINEAR CURRENT

AMPLIFIER

2

3

VOUT

REVERSE VOLTAGE

COMPARATOR

30 mV

FAULT

THERMAL

SHUTDOWN

INTERNAL

BIAS

+

–

1

15

14 VOUT

VIN

CURRENT SENSE

H = OPEN

1.5 V

SHTDWN

IMAX

VOUT

VIN

POWER

FET *

NOTE: Pin numbers refer to DIL-16 and SOIC-16 packages.

Copyright

 2000, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.