Current-Regulating Hot-Swap Controller with
DualSpeed/BiLevel Fault Protection
_______________________________________________________________________________________   7
Pin Description
PIN
Supply Voltage Input. Connect to 2.7V to 13.2V.
V
IN
1
FUNCTION
NAME
Current-Sense Resistor Voltage Input. R
SENSE
is connected from V
IN
to VSEN.
VSEN
2
Ground
GND
4
Gate Drive Output. Connect to gate of external N-channel MOSFET.
GATE
3
Start-Up Timer Setting. Leave floating or connect the timing capacitor from CTIM to GND. See Start-Up
Timing Capacitor section.
CTIM
6
ON Comparator Input. Connect high for normal operation; connect low to force the MOSFET off. Comparator
threshold V
TH,ON
= 0.6V allows for precise control over shutdown feature. Pulse ON low for at least 20祍,
then high to restart after a fault.
ON
8
Status Outputopen drain. High indicates start-up completed with no fault. See Table 1.
STAT
7
Slow Comparator Speed Setting. Leave floating or connect the timing capacitor from CSPD to GND. See
Slow Comparator Response Time section.
CSPD
5
MAX4370
6礎
SLOW COMPARATOR
FAST COMPARATOR
6礎
2.45V
C
SPD
CSPD
INPUT
UVLO
LOGIC
CONTROL
DISCHARGE
ENABLE
V
IN
STAT
GND
CTIM
C
TIM
4礎
0.1V
0.6V
ON
R
SENSE
N
M1
GATE
VSEN
V
IN
GATE
OVLO
ON COMPARATOR
GATE
DRIVE
CHARGE
PUMP
V
SC, TH
50mV
V
FC, TH
200mV
150ms
DELAY
ON
VIN RISING
V
OUT
Figure 1. Functional Diagram
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