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ꢄ ꢅ ꢈꢉ ꢊꢋꢌ ꢍ ꢋꢎꢏ ꢏ ꢎꢐꢑ ꢒ ꢓꢌ ꢔ ꢕꢖꢎꢊ ꢊꢌ ꢖ ꢒꢋ ꢏ ꢎꢗ ꢎ ꢍꢒ ꢋ
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SLUS198C – FEBUARY 2000 - REVISED - JUNE 2001
D
Integrated 0.15-Ω Power MOSFET
D
Thermal Shutdown
D
D
7-V to 15-V Operation
D
D
Fault-Output Indicator
Digital-Programmable Current Limit from
0 A to 3 A
Maximum-Output Current Can Be Set to 1 A
Above the Programmed-Fault Level or to a
Full 4 A
D
D
D
D
100-µA I
When Disabled
CC
D
Power SOIC and TSSOP, Low Thermal
Resistance Packaging
Programmable On Time
Programmable Start Delay
Fixed 2% Duty Cycle
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 . All control and housekeeping functions are integrated,
T
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
2
3
VIN
VIN
REVERSE VOLTAGE
COMPARATOR
–
30 mV
CHARGE
PUMP
H = 4 A
IMAX 10
+
V
OUT
MAX
CURRENT
LEVEL
CURRENT SENSE
H = OPEN
4 A
+
–
POWER
FET *
LINEAR CURRENT
AMPLIFIER
1 A
ABOVE
FAULT
14 VOUT
15 VOUT
OVER CURRENT
COMPARATOR
ON TIME
CONTROL
CURRENT FAULT
LEVEL 0–3 A
+
–
2% DUTY
CYCLE
THERMAL
SHUTDOWN
1.5 V
0–3 A
+
–
0.25
RES
INTERNAL
BIAS
1
SHTDWN
6
7
8
9
5
4
13
12
11
16
HEAT SINK
GND PINS
B3
B2
B1
B0
GND
CT
FAULT
4 BIT DAC
UDG-99174
NOTE: Pin numbers refer to DIL-16 and SOIC-16 packages.
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.
Copyright 2000, Texas Instruments Incorporated
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