UCC2915, UCC3915
15 V PROGRAMMABLE HOT SWAP POWER MANAGER
SLUS198B 鈥?FEBUARY 2000 - REVISED - DECEMBER 2000
D
Integrated 0.15-鈩?Power MOSFET
D
7-V to 15-V Operation
D
Digital-Programmable Current Limit from
D
D
D
D
0 A to 3 A
100-碌A(chǔ) I
CC
When Disabled
Programmable On Time
Programmable Start Delay
Fixed 2% Duty Cycle
D
Thermal Shutdown
D
Fault-Output Indicator
D
Maximum-Output Current Can Be Set to 1 A
D
Above the Programmed-Fault Level or to a
Full 4 A
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
2
CHARGE
PUMP
MAX
CURRENT
LEVEL
+
鈥?/div>
1A
ABOVE
FAULT
LINEAR CURRENT
AMPLIFIER
REVERSE VOLTAGE
COMPARATOR
鈥?/div>
+
30 mV
+
VOUT
3
CURRENT SENSE
H = OPEN
POWER
FET *
VIN
VIN
IMAX 10
H=4A
4A
14 VOUT
OVER CURRENT
COMPARATOR
CURRENT FAULT
LEVEL 0鈥? A
+
鈥?/div>
ON TIME
CONTROL
2% DUTY
CYCLE
THERMAL
SHUTDOWN
INTERNAL
BIAS
+
鈥?/div>
1
SHTDWN
1.5 V
15 VOUT
0鈥? A
0.25
RES
6
B3
7
B2
8
B1
9
B0
5
GND
4
13
12
11
CT
16
FAULT
UDG-99174
4 BIT DAC
HEAT SINK
GND PINS
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.
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.
Copyright
漏
2000, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
1
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