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参数资料
| 型号： | MAX4944BELA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC CTLR OVP W/FET 6.35V 8-UDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 过压保护控制器 |
| 应用： | 手机，数码相机，媒体播放器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN |
| 供应商设备封装： | 8-uDFN（2x2） |
| 包装： | 带卷 (TR) |
Detailed Description
The MAX4943–MAX4946/MAX4949 overvoltage-protec-
tion devices feature a low RON internal FET and protect
low-voltage systems against voltage faults up to +28V. If
the input voltage exceeds the overvoltage threshold, the
internal MOSFET is turned off to prevent damage to the
protected components. These devices also drive an
optional external pFET to protect down to -28V. If the
adapter voltage drops below ground, the pFET turns off
to prevent damage to the protected components due to
negative voltage exposure. The internal charge pump’s
15ms (typ) debounce time prevents false turn-on of the
internal switch during startup. An open-drain, active-low
logic output is available to signal that a successful
power-up has occurred.
MAX4943–MAX4946/MAX4944L/MAX4945A/MAX4945L/MAX4949
Overvoltage-Protection Controllers with
Internal FET
_______________________________________________________________________________________
5
Pin Description
PIN
NAME
FUNCTION
1, 2
IN
Voltage Input. IN powers the charge pump required to turn on the internal switch. When the correct
adapter is plugged in, a 15ms (typ) debouncer prevents false turn-on of the internal switch. Bypass
IN to GND with a 1F ceramic capacitor as close as possible to the device to enable ±15kV (HBM)
ESD protection on IN.
3
GP
pFET Gate-Drive Output. GP pulls the external pFET gate down when the input is above ground.
4
ACOK
Active-Low Open-Drain Adapter-Voltage Indicator Output.
ACOK is driven low after the adapter
voltage is stable between VUVLO and VOVLO for 30ms (typ). Connect a pullup resistor from ACOK to
the logic I/O voltage of the host system.
5
GND
Ground
6, 7, 8
OUT
Output Voltage. Output of internal switch. Short all pins together for proper operation.
GP
OUT
VOVLO
15ms (typ)
DEBOUNCE
TIMER AND
RETRY TIME
30ms (typ)
TIMER
OSCILLATOR
CHARGE
PUMP
OVERCURRENT
OR
THERMAL
FAULTS
IN
GND
CHARGE-PUMP
ENABLED
VUVLO
ACOK
MAX4943–MAX4946/MAX4944L/
MAX4945L/MAX4949
+
-
+
-
RESET
Figure 1. Functional Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4944ELA+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4944ELA+G65 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4944ELA+T | 功能描述:电流和电力监控器、调节器 Overvoltage-Protect Controller RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX4944ELA+TG65 | 制造商:Maxim Integrated Products 功能描述: |
| MAX4944LELA+G65 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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