UCC3915DP Datasheet, PDF (1/15 Pages) Texas Instruments – 15-V PROGRAMMABLE HOT SWAP POWER MANAGER

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UCC2915, UCC3915
15ĆV PROGRAMMABLE HOT SWAP POWER MANAGER
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
SLUS198C – FEBUARY 2000 - REVISED - JUNE 2001
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
IMAX 10
H=4A
4A
1A
ABOVE
FAULT
MAX
CURRENT
LEVEL
CURRENT FAULT
LEVEL 0–3 A
0–3 A
0.25
RES
CHARGE
PUMP
REVERSE VOLTAGE
COMPARATOR
–
+
30 mV
VOUT
CURRENT SENSE
+
–
LINEAR CURRENT
AMPLIFIER
H = OPEN
2 VIN
3 VIN
POWER
FET *
OVER CURRENT
COMPARATOR
+
–
ON TIME
CONTROL
2% DUTY
CYCLE
THERMAL
SHUTDOWN
INTERNAL
BIAS
14 VOUT
15 VOUT
1.5 V
+
–
1 SHTDWN
6789
5 4 13 12
B3 B2 B1 B0
4 BIT DAC
GND HEAT SINK
GND PINS
NOTE: Pin numbers refer to DIL-16 and SOIC-16 packages.
11
16
CT
FAULT
UDG-99174
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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.
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