UCC3912
PROGRAMMABLE HOT SWAP POWER MANAGER
SLUS241B 鈥?MARCH 1994 - REVISED - DECEMBER 2000
D
Integrated 0.15-鈩?Power MOSFET
D
3-V to 8-V Operation
D
Digital Programmable Current Limit from 0
D
D
D
D
D
to 3 A
Electronic Circuit Breaker Function
1碌A I
CC
When Disabled
Programmable on Time
Programmable Start Delay
Fixed 3% Duty Cycle
D
D
D
D
D
Unidirectional Switch
Thermal Shutdown
Fault-Output Indicator
Maximum-Output Current Can Be Set to 1 A
Above the Programmed Fault Level or to a
Full 4 A
Power SOIC, Low-Thermal Resistance
Packaging
description
The UCC3912 hot swap power manager provides complete power management, hot swap capability, and circuit
breaker functions. The only component required to operate the device, other than 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 3% duty cycle ratio limits average output power.
The internal 4-bit DAC allows programming of the fault level current from 0 to 3 A with 0.25-A resolution. The
IMAX control pin sets the maximum sourcing current to 1 A above the fault level when driven low, and to a full
4 A when driven high for applications which require fast output capacitor charging.
When the output current is below the fault level, the output MOSFET is switched on with a nominal on resistance
of 0.15
鈩?
When the output current exceeds the fault level, but is less than the maximum sourcing level, the
output remains switched on, but the fault timer starts charging C
T
. Once C
T
charges to a preset threshold, the
switch is turned off, and remains off for 30 times the programmed fault time. When the output current reaches
the maximum sourcing level, the MOSFET transitions from a switch to a constant current source. (continued)
block diagram
H=4A
IMAX
10
CHARGE
PUMP
REVERSE VOLTAGE
COMPARATOR
30 mV
+
3
V OUT
VIN
鈥?/div>
+
CURRENT SENSE
4A
+
MAX CURRENT
LEVEL
1A
ABOVE
FAULT
CURRENT FAULT
LEVEL 0A TO 3 A
+
鈥?/div>
OVERCURRENT
COMPARATOR
鈥?/div>
LINEAR CURRENT AMPLIFIER
H = OPEN
POWER
FET
2
VIN
ON TIME
CONTROL
3% DUTY
CYCLE
14
15
THERMAL
SHUTDOWN
+
鈥?/div>
1
1.5 V
VOUT
VOUT
0 A鈥? A
0.25
RES
INTERNAL
BIAS
SHTDWN
6
B3
7
B2
8
B1
9
B0
5
GND
4
13
12
11
CT
16
FAULT
UDG-99146
4 BIT DAC
HEATSINK
GND PINS
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
UCC3912DP 產品屬性
40
集成電路 (IC)
PMIC - 熱交換
-
熱交換開關
通用
是
可調
3 V ~ 8 V
0°C ~ 70°C
表面貼裝
16-SOIC（0.154"，3.90mm 寬）
16-SOIC N
管件
296-2333-5
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