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3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
Pin Description (continued)
PIN
MAX4271
MAX4272
MAX4273
NAME
FUNCTION
Startup and Retry Timers Input. Controls the startup time and the autoretry time (32x
startup time) in the MAX4272, only the autoretry time in the MAX4273, and only the
6
11
CTIM
startup time in the MAX4271. Leave floating or connect the timing capacitor from CTIM
to GND. Connect to IN for latched mode (this prevents autoretry in MAX4273). See
Startup and Retry Timers section.
7
12
STAT
Status Output. High indicates startup completed with no fault (Table 1). STAT is an
open-drain output.
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
8
13
ON
shutdown feature. Pulse ON low for 20 μ s min to unlatch after a fault (MAX4273 in
latched mode, or MAX4271). Negative pulses are ignored during autoretry (MAX4273
in autoretry mode, or MAX4272). See ON and Reset Comparators section.
—
—
—
14
15
16
REF
INC
OUTC
1.2V Reference Output. Do not bypass with a capacitor to GND.
Uncommitted Comparator Input. Controls OUTC.
Uncommitted Comparator Output. OUTC goes high 150ms after INC goes high. OUTC
goes low immediately after INC goes low. OUTC is an open-drain output.
Detailed Description
The MAX4271/MAX4272/MAX4273 are circuit breaker
ICs designed for hot-swap applications where a line
card is inserted into a live backplane. Normally, when a
line card is plugged into a live backplane, the card’s
discharged filter capacitors provide a low impedance
that can momentarily cause the main power supply to
collapse. The MAX4271/MAX4272/MAX4273 are
designed to reside either in the backplane or in the
removable card to provide inrush current limiting and
short-circuit protection. This is achieved by using an
external N-channel MOSFET, an external current-sense
resistor, and two on-chip comparators. Figures 1 and 2
show the functional diagrams.
The timing and voltage levels for several critical parame-
ters can be adjusted with external resistors, external
capacitors, or by pin strapping. The timing components
are optional; without them, the part is set to its nominal
values, as shown in the Electrical Characteristics . The
parameters that can be adjusted are:
? Current-limit threshold
? Slow comparator response time
? Startup timer
? Fast comparator threshold
? Autoretry timeout period (time the part is shut down
after an overcurrent event)
? Fault management (latched/autoretry)
? Current overload threshold
Startup Mode
CTIM (MAX4271/MAX4272) or CTON (MAX4273) sets
the startup period (see Startup and Retry Timers ). The
startup period begins after three conditions are met:
1) 150ms after V IN exceeds the UVLO threshold (see
Over/Undervoltage Lockouts )
AND
2) 10μs after V ON >0.6V
AND
3) The device is no longer in retry mode.
During startup, the slow comparator is disabled and the
inrush current can be limited in two ways:
1) Slow ramping of the current to the load by control-
ling the external MOSFET gate voltage
OR
2) Limiting the current to the load by regulating the volt-
age across the external current-sense resistor
10
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MAX4274ABESA
功能描述:运算放大器 - 运放 Integrated Circuits (ICs)
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
MAX4274ABESA+T
功能描述:运算放大器 - 运放 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
MAX4274ABESA-T
功能描述:运算放大器 - 运放
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
MAX4274ABEUA
功能描述:运算放大器 - 运放 Integrated Circuits (ICs)
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
MAX4274ABEUA-T
功能描述:运算放大器 - 运放
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
MAX4274ACESA
功能描述:运算放大器 - 运放
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
MAX4274ACESA-T
功能描述:运算放大器 - 运放
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
MAX4274ACEUA
功能描述:运算放大器 - 运放
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