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3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
V IN
V CC
BACKPLANE
REMOVABLE
CARD
10k
IN
SENSE
GATE
LLMON
INC
μ P
IN
SENSE GATE
MAX4273
MAX4271
Figure 12. Power-On Reset
V IN
OUTC
NTC
RESET
V OUT
RESET
ON
1M
MAX4272
MAX4273
IN
SENSE
GATE
INC
MAX4273
REF
ON
OUTC
Figure 14. Fail-Safe Connector
gate drive until the MOSFET is turned off and the main
GND
LLMON
supply recovers. The 1μF capacitor is charged from V IN
through an internal switch during normal operation.
Maximum Load Capacitance
The MAX4271/MAX4272/MAX4273 can be used on the
Figure 13. Power-On Reset and Temperature
The ON and INC comparator inputs and the STAT and
OUTC can be pulled to voltages up to 14V indepen-
dently of V IN , thus allowing parts to be daisy-chained
and not be turned on through the internal protection
diodes. In some applications, it is useful to use connec-
tors with staggered leads. In Figure 14, the ON pin
forces the removable board to be powered up only
when all connections are made.
Auxiliary V CC
The auxiliary V CC is available on the MAX4273 and is
used to sustain the input voltage required for the device
to operate during a short-circuit condition on the board.
When a short occurs, the main system power supply
could collapse and the MAX4273 will not have enough
voltage to keep the gate drive operational and turn off
the external MOSFET. If the fault is not removed, the
system could remain in a sustained short-circuit state.
Connect a 1μF capacitor from the AUXVCC pin to GND.
This capacitor will deliver the necessary energy to the
backplane to regulate current upon insertion of a
removable card (Figure 16). This allows multiple cards
with different input capacitance to be inserted into the
same slot even if the card doesn’t have on-board hot-
swap protection.
The MAX4271/MAX4272/MAX4273 current-limiting fea-
ture is active during the startup period set by CTIM.
The startup period can be triggered if V IN is connected
to ON through a trace on the card. Once t START has
expired (timed out), the load capacitance has to be
charged or a fault condition is detected. To ensure
startup with a fixed CTIM, t START has to be longer than
the time required to charge the board capacitance. The
maximum load capacitance is calculated as follows:
C BOARD < t START ? I FAST,SET / V IN
Input Transients
The voltage at V IN must be above the UVLO during
inrush and fault conditions. When a short condition
occurs on the board, the fault current can be higher
than the fast comparator current limit. The gate voltage
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RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel
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