MAX4271/MAX4272/MAX4273
3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
_______________________________________________________________________________________ 9
Typical Operating Characteristics (continued)
(V
IN
= 5V, R
SENSE
= 100mΩ, C
BOARD
= 47µF, T
A
= +25°C, unless otherwise noted.)
C
BOARD
= 0, R
SENSE
= 100m
Ω
,
C
GATE
= 0, R
S
= 0
I
LOAD
1A/div
V
OUT
2V/div
V
GATE
2V/div
0
50
μ
s/div
TURN-OFF TIME (C
BOARD
= 0)
MAX4271/3-37
ON
0
C
BOARD
= 0, R
SENSE
= 100m
Ω
,
C
TIM
= 10nF, C
GATE
= 0
V
OUT
2V/div
V
GATE
2V/div
ON
100
μ
s/div
STARTUP TIME (C
BOARD
= 0)
MAX4271/3-35
MAX4273
NAME
FUNCTION
— 1 RTH
Current-Sense Threshold Setting Input. Connect a resistor from RTH to V
IN
to set the
fast comparator threshold. Bypass to V
IN
with 0.1μF. 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.
—2
AUXVCC
Auxiliary Supply Input. Supply input for short-circuit switchover. To use this, connect a
1μF capacitor from AUXVCC to GND; otherwise, leave floating. See Auxiliary V
CC
section.
13IN
Input Voltage. Connect to +2.7V to +13.2V supply; 15V absolute maximum voltage
rating.
2 4 SENSE Current-Sense Resistor Voltage Input. R
SENSE
is connected from IN to SENSE.
3 5 GATE Gate Drive Output. Connect to gate of external N-channel pass transistor.
—6
CEXT
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.
—7
LLMON
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.
4 8 GND Ground
— 9 CTON
Startup Timer Input. Leave floating or connect the timing capacitor from CTON to GND.
See Startup and Retry Timers section.
5 10 CSPD
Slow Comparator Speed Setting. Leave floating or connect the timing capacitor from
CSPD to GND. See Slow Comparator Response Time section.
