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3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
Typical Operating Characteristics (continued)
( V IN = 5V, R SENSE = 100m Ω , C BOARD = 47μF, T A = +25°C, unless otherwise noted. )
STARTUP TIME (C BOARD = 0)
MAX4271/3-35
ON
TURN-OFF TIME (C BOARD = 0)
MAX4271/3-37
ON
100 μ s/div
C BOARD = 0, R SENSE = 100m Ω ,
C TIM = 10nF, C GATE = 0
V GATE
2V/div
V OUT
2V/div
V GATE
2V/div
V OUT
2V/div
0
50 μ s/div
C BOARD = 0, R SENSE = 100m Ω ,
C GATE = 0, R S = 0
I LOAD
1A/div
0
Pin Description
PIN
MAX4271
MAX4272
MAX4273
NAME
FUNCTION
Current-Sense Threshold Setting Input. Connect a resistor from RTH to V IN to set the
—
1
RTH
fast comparator threshold. Bypass to V IN with 0.1 μ F. Connect RTH to V IN to disable
both the fast comparator and current regulation at startup. Short RTH to GND for a
200mV threshold. See Fast Comparator Threshold section.
Auxiliary Supply Input. Supply input for short-circuit switchover. To use this, connect a
—
2
AUXVCC
1 μ F capacitor from AUXVCC to GND; otherwise, leave floating. See Auxiliary V CC
section.
1
2
3
—
3
4
5
6
IN
SENSE
GATE
CEXT
Input Voltage. Connect to +2.7V to +13.2V supply; 15V absolute maximum voltage
rating.
Current-Sense Resistor Voltage Input. R SENSE is connected from IN to SENSE.
Gate Drive Output. Connect to gate of external N-channel pass transistor.
External Gate Capacitance Connection. Connect a capacitor from CEXT to GATE to
increase the gate charging time. This pin goes high impedance during a fast
comparator fault for fast discharge.
—
4
—
5
7
8
9
10
LLMON
GND
CTON
CSPD
Load Line Monitor. Connect to the source of the external N-channel MOSFET. The
external FET is turned on only when the load voltage is less than 100mV.
Ground
Startup Timer Input. Leave floating or connect the timing capacitor from CTON to GND.
See Startup and Retry Timers section.
Slow Comparator Speed Setting. Leave floating or connect the timing capacitor from
CSPD to GND. See Slow Comparator Response Time section.
_______________________________________________________________________________________
9
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