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UCC2919 Datasheet

  • UCC2919

  • 3V to 8V Hot Swap Power Manager

  • 11頁

  • TI

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application
INFO
available
UCC1919
UCC2919
UCC3919
3V to 8V Hot Swap Power Manager
FEATURES
鈥?/div>
Precision Fault Threshold
鈥?/div>
Charge Pump for Low RDS
ON
High Side
Drive
鈥?/div>
Differential Sense Inputs
鈥?/div>
Programmable Average Power Limiting
鈥?/div>
Programmable Linear Current Control
鈥?/div>
Programmable Fault Time
鈥?/div>
Fault Output Indicator
鈥?/div>
Manual and Automatic Reset Modes
鈥?/div>
Shutdown Control w/Programmable
Softstart
鈥?/div>
Undervoltage Lockout
鈥?/div>
Electronic Circuit Breaker Function
DESCRIPTION
The UCC3919 family of Hot Swap Power Managers provide complete
power management, hot swap, and fault handling capability. The
UCC3919 features a duty ratio current limiting technique, which pro-
vides peak load capability while limiting the average power dissipa-
tion of the external pass transistor during fault conditions. The
UCC3919 has two reset modes, selected with the TTL/CMOS com-
patible L/R pin. In one mode, when a fault occurs the IC repeatedly
tries to reset itself at a user defined rate, with user defined maximum
output current and pass transistor power dissipation. In the other
mode the output latches off and stays off until either the L/R pin is re-
set or the shutdown pin is toggled. The on board charge pump circuit
provides the necessary gate voltage for an external N-channel power
FET.
BLOCK DIAGRAM
VDD
13
VDD
LINEAR
CURRENT
AMPLIFIER
+
鈥?/div>
OVERLOAD
COMPARATOR
鈥?/div>
+
CHARGE
PUMP
4
CAP
CSP
14
OVERCURRENT
COMPARATOR
CSN
12
+
50mV
鈥?/div>
+
DRIVER
VDD
UVLO
UVLO
10
GATE
200mV
+
IMAX
1
+
1.5v
1X
UVBIAS
VDD
36碌A(chǔ)
1X
IBIAS
2
SET
DOMINANT
S
Q
FLT
SD
PL
9
+
1.5V
CT
8
0.5V
+
鈥?/div>
11
1.2碌A(chǔ)
RESET
DOMINANT
SD
5
LR
6
SD
R
Q
R
GND
Q
鈥?/div>
S
Q
S
Q
R
Q
UVBIAS
FLT
7
FLT
Note: Pins shown for 14-pin package.
UDG-98123
07/99

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