参数资料
| 型号： | MAX4273EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/26页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX4273 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | 电源管理，热交换控制器 |
| 已用 IC / 零件： | MAX4273 |
| 已供物品： | 板 |
3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
C SPD
V IN
CSPD
IN
6 μ A
2.45V
MAX4271
MAX4272
6 μ A
V SC,TH
50mV
SLOW COMPARATOR
R SENSE
V SC,TH
150ms
DELAY
ON
INPUT
UVLO
FAST COMPARATOR
200mV
SENSE
STAT
V IN RISING
DISCHARGE
ENABLE
GATE
DRIVE
CHARGE
PUMP
GATE
M1
N
(1MHz)
V IN
LOGIC
CONTROL
0.1V
GATE
C TIM
CTIM
4 μ A
OVLO
ON COMPARATOR
ON
0.6V
V OUT
GND
Figure 1. MAX4271/MAX4272 Functional Diagram
Unlike other circuit breaker ICs, the MAX4271/
MAX4272/MAX4273 regulate the current to a preset
level instead of completely turning off the external
N-FET if an overcurrent condition occurs during startup.
In startup mode, the gate drive current is limited to
100μA and decreases with the increase of the gate
voltage (see Gate Charge Current vs. Gate Voltage in
the Typical Operating Characteristics ). This allows the
controller to slowly enhance the MOSFET. If the fast
comparator detects an overcurrent, the gate voltage is
momentarily discharged with a fixed 70μA current until
the load current through the sense resistor (R SENSE )
decreases below its threshold point. This effectively
regulates the inrush current during startup. Figure 3
shows the startup waveforms. STAT goes high at the
end of the startup period if no fault condition is present.
Normal Operation (DualSpeed/BiLevel)
In normal operation (after the startup timer has
expired), protection is provided by turning off the exter-
nal MOSFET when a fault condition is encountered.
DualSpeed/BiLevel fault protection incorporates two
comparators with different thresholds and response
times to monitor the current:
1) Slow comparator . This comparator has an externally
set response time (from 20μs to seconds) and a fixed
50mV threshold voltage. The slow comparator
ignores low-amplitude momentary current glitches.
After an extended overcurrent condition, a fault is
generated and the MOSFET gate is slowly dis-
charged.
2) Fast comparator . This comparator has a fixed 350ns
response time and a 200mV threshold voltage
(adjustable from 50mV to 750mV in MAX4273). The
fast comparator turns off the MOSFET immediately
after it detects a large amplitude event such as a
short circuit.
______________________________________________________________________________________
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
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