1
SC4250
Negative Voltage
Hot Swap Controller
POWER MANAGEMENT
Revision 2.0
Programmable slew of the inrush current when
used for hot insertion in the negative 24V and 48V
backplane
Closed loop operation limits the maximum current
even in short circuit condition
Built in timer prevents false shutdown when the
closed loop operation limits the current
Sensing the drain voltage allows for immediate
shutdown in short circuit conditions where current
spikes and noise are ignored
Power good signal
Input UVLO and OVLO sensing
Circuit breaker and retry
SO-8 package
Central office switching
-48V Distributed power systems
Power supply hotswap & inrush control
Description
Features
Applications
Typical Application Circuit
The SC4250 is a negative voltage hotswap controller
that allows the insertion of line cards into a live backplane.
The inrush current is programmable, and the closed loop
operation limits the maximum current even under short
circuit conditions. A built-in timing circuit prevents false
shutdown. The signal from the drain voltage is fed to the
timer, providing safety for the MOSFET when in linear
mode. The SC4250 latches off under abnormal condi-
tions The power has to be recycled in order to resume
operation.
The device comes in two options, PWRGD (SC4250H)
and PWRGD (SC4250L). These high or low signals can
be directly used to enable power modules.
Figure 1
Q1
C3
0.33
C5
150
GND
-- 48V
R5
10
R1
562k
R3
10.2k
R4
0.01
R6
18k
R2
9.31k
C4
3.3nF
DRAIN
7
UV
3
VEE
4
GATE
6
PWRGD
1
SENSE
5
VCC
8
OV
2
U1
SC4250
GND(remote)
C2
0.0 01
C1
0.1
Vee
WRGD/ PWRGD
/PWRGD
VEE
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