Datasheet

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     
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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
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