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3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
is stable. Any input voltage transient at IN below the
UVLO threshold will reset the device and initiate a start-
up sequence.
These devices also have an overvoltage lockout
(OVLO) feature that prevents the device from restarting
after a fault condition if the discharge has not been
completed. V GATE has to be discharged to below 0.1V.
Additionally, the MAX4273 LLMON pin discharges the
load line with a 1k Ω pulldown and prevents startup until
the load voltage is below 0.1V.
Since the MAX4271/MAX4272 do not monitor the output
voltage, a startup sequence can be initiated while the
board capacitance is still charged.
A large board capacitance or a short startup period may
prevent the MAX4272 from charging completely in one
startup period. The MAX4272 responds to these condi-
tions by charging the capacitor with bursts defined by a
t ON duty cycle and a period of t ON + t RETRY . The charg-
ing will be complete after several retries unless the resis-
Applications Information
Component Selection
N-Channel MOSFET
Select the external N-channel MOSFET according to
the application’s current level. Table 2 lists some rec-
ommended components. The MOSFET’s on-resistance
(R DS(ON) ) should be chosen low enough to have a min-
imum voltage drop at full load to limit the MOSFET
power dissipation. High R DS(ON) can cause output rip-
ple if the board has pulsing loads or triggers an exter-
nal undervoltage reset monitor at full load. Determine
the device power-rating requirement to accommodate
a short circuit on the board at startup with the device
IN
R SENSE
tive load or current load excessively discharges the
board capacitance during the retry timeout. This feature
applies to the MAX4273 if LLMON is left floating or is
connected to GND. To prevent multiple charging bursts,
ensure that the t ON timer exceeds the minimum time
MAX4271
MAX4272
SENSE
V GD
required to complete the charge of the board capaci-
tance (see Component Selection ).
Gate Overvoltage Protection
New-generation MOSFETs have an absolute maximum
rating of ±8V for the gate-to-source voltage (V GS ). To
GATE DRIVE
CHARGE PUMP
GATE
V GS
D1
M1
N
V OUT
protect these MOSFETs, the MAX4271/MAX4272 limit the
gate-to-drain voltage (the MAX4273 limits the gate-to-
source voltage) to +7.5V with an internal zener diode. No
protection is provided for negative V GS (MAX4271/
MAX4272). If GATE can be discharged to ground faster
than the output voltage, an external small-signal protec-
tion diode (D1) can be used, as shown in Figure 6. The
MAX4273 has the protection diode internal.
C BOARD
Figure 6. External Gate-Source Protection
Table 2. Recommended N-Channel
MOSFETs
ON
CTIM
(CTON)*
STAT
V IN
O
1.2V
O
V IN
O
t START
FAULT CONDITION,
OR ON FALLING
EDGE
NO FAULT CONDITIONS PRESENT
PART
NUMBER
IRF7413
IRF7401
IRL3502S
MMSF3300
MMSF5N02H
MTB60N05H
FDS6670A
NDS8426A
MANUFACTURER
International
Rectifier
Motorola
Fairchild
DESCRIPTION
11m Ω , 8 SO, 30V
22m Ω , 8 SO, 20V
6m Ω , D2PAK, 20V
20m Ω , 8 SO, 30V
30m Ω , 8 SO, 20V
14m Ω , D2PAK, 50V
10m Ω , 8 SO, 30V
13.5m Ω , 8 SO, 20V
*MAX4273 ONLY
Figure 5. Status (STAT) Output Timing Diagram
FDB8030L
4.5m Ω , D2PAK, 30V
______________________________________________________________________________________
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相关代理商/技术参数
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
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