Hot Swap Controller
in 6-Lead TSOT Package
Data Sheet
ADM4210
Rev. A
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FEATURES
Controls supply rails from 2.7 V to 16.5 V
Allows protected board removal and insertion to a live
backplane
External sense resistor provides adjustable analog current
limit with circuit breaker
Peak fault current limited with fast response
Charge pumped gate drive for external N-FET switch
Automatic retry or latch-off during current fault
Undervoltage lockout
Low profile (1 mm), 6-lead, TSOT package
Pin compatible with LTC4210-1 and LTC4210-2
APPLICATIONS
Hot swap board insertion: line cards, raid systems
Industrial high-side switches/circuit breakers
Electronic circuit breakers
GENERAL DESCRIPTION
The ADM4210 is a hot swap controller that safely enables a
printed circuit board to be removed and inserted to a live
backplane. This is achieved using an external N-channel power
MOSFET with a current control loop that monitors the load
current through a sense resistor. An internal charge pump is
used to enhance the gate of the N-channel FET. When an
overcurrent condition is detected, the gate voltage of the FET is
reduced to limit the current flowing through the sense resistor.
During an overcurrent condition, the TIMER cap determines
the amount of time the FET remains at a current limiting mode
of operation until it is shut down. The ON (ON-CLR
) pin is the
enable input for the device and can be used to monitor the
input supply voltage. The ADM4210 operates with a supply
voltage ranging from 2.7 V to 16.5 V.
The ADM4210 is available in two options: the ADM4210-1 with
automatic retry for overcurrent fault and the ADM4210-2 with
latch off for an overcurrent fault. Toggling the ON (ON-CLR
)
pin resets a latched fault. The ADM4210 is packaged in a
6-lead TSOT.
FUNCTIONAL BLOCK DIAGRAM
LONG
V
IN
= 5V
V
OUT
= 5V
V
CC
R
SENSE
0.01&
Q
1
C
TIMER
0.22礔
C
TIMER
GATE
LONG
1.3V
SHORT
SENSE
GATE
DRIVE/
LOGIC
ON
TIMER
ADM4210
GND
GND
GND
R
ON1
20k&
R
G
100&
R
C
100&
C
C
0.01礔
R
ON2
10k&
C
LOAD
470礔
+
Figure 1.
10ms/DIV
V
ON
(2V/DIV)
V
TIMER
(1V/DIV)
V
OUT
(5V/DIV)
I
OUT
(0.5A/DIV)
C
LOAD
= 470礔
Figure 2. Start-Up Sequence
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