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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 I
CC
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, C
T
. 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
1113 1245
B3 B2 B1 B0
4 BIT DAC
GND
HEAT SINK
GND PINS
CT
CHARGE
PUMP
+
–
+
16
LINEAR CURRENT
AMPLIFIER
2
3
V
OUT
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
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.
