UCC39161_10 Datasheet, PDF (1/6 Pages) Texas Instruments – LOW CURRENT HOT SWAP POWER MANAGER

D Integrated Circuit Breaker Function
D Integrated 0.2-W Power FET
D 1mA I_CC When Disabled
D Programmable On Time
D Accurate 0.8-A (MAX) Current
D Fixed 3% Duty Cycle
D Unidirectional Switch
D Thermal Shutdown
UCC39161
LOW CURRENT HOT SWAP POWER MANAGER
SLUS410C -- NOVEMBER 1999 -- REVISED FEBRUARY 2000
SOIC 8-PIN
DP PACKAGE
(TOP VIEW)
description
The UCC39161 low-current hot-swap power manager provides complete power management, hot-swap
capability, and circuit-breaker functions with minimal external components. For most applications, the only
external component required to operate the device, other then supply bypassing, is a timing capacitor that sets
the fault time.
The maximum current level is internally programmed for 0.8 A. While the output current is below 0.8 A, the
internal power MOSFET is switched on at a nominal 220 mW. When the output current exceeds 0.8 A, the
MOSFET transitions from a switch to a constant current source and the fault timer starts charging CT. Once the
fault time is reached, the current shuts off for a time, which equates to a 3% duty cycle.
The UCC39161 also provides unidirectional current flow, emulating a diode in series with the power MOSFET.
The UCC39161 can be put into sleep mode by grounding the SHTDWN pin. In sleep mode, the UCC39161
draws under 5 mA of supply current.
Other features include thermal shutdown and a low thermal-resistance small-outline power package.
block diagram
VIN
V_IN
1 ^{4V to 6V}
CHARGE
PUMP
REVERSE VOLTAGE
COMPARATOR
–
+
30mV
OUTPUT
MAXIMUM
CURRENT
LEVEL
0.8A
+
–
LINEAR
CURRENT
AMPLIFIER
CURRENT SENSE
H=OPEN
POWER
FET
OUTPUT
8
LOAD
C_IN
+
ON TIME CONTROL
–
3% DUTY CYCLE
C_LOAD
OVER CURRENT
COMPARATOR
THERMAL
SHUTDOWN
1.5V
4 HEATSINK PINS
GND GND GND GND
2367
CT
4
INTERNAL
BIAS
+
–
5
SHTDWN
C_T
UDG-99168
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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.
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