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Part Number: MAX4838
Description: The MAX4838MAX4841 are overvoltage protection ICs that protect low-voltage systems against voltages of up to 28V. If th...
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MAX4838
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General Description
MAX4838 General Description
The MAX4838MAX4841 are overvoltage protection ICs that protect low-voltage systems against voltages of up to 28V. If the input voltage exceeds the overvoltage trip level, the MAX4838MAX4841 turn off the low-cost external N-channel FET(s) to prevent damage to the protected components. An internal charge pump eliminates the need for external capacitors and drives the FET gate for a simple, robust solution.
The MAX4838/MAX4839 have a 7.4V overvoltage threshold, and the MAX4840/MAX4841 have a 5.8V overvoltage threshold. All devices have an undervoltage lockout threshold of 3.25V. In addition to the single FET configuration, the devices can be configured with back-to-back external FETs to prevent currents from being back-driven into the adapter.
On power-up, the device waits for 50ms before driving GATE high. FLAG is held low for an additional 50ms after GATE goes high before deasserting. The MAX4838/MAX4840 have an open-drain FLAG output, and the MAX4839/MAX4841 have a push-pull FLAG output. The FLAG output asserts immediately to an overvoltage fault.
Additional features include a 15kV ESD-protected input (when bypassed with a 1µF capacitor) and a shutdown pin (EN) to turn off the device (MAX4838/MAX4840).
All devices are offered in a small 6-pin SC70 package and are specified for operation from -40°C to +85°C.
MAX4838 Maximum Ratings
IN to GND ......................................................................-0.3V to +30V
GATE to GND .................................................................-0.3V to +12V
EN, FLAG to GND .............................................................-0.3V to +6V
Continuous Power Dissipation (TA = +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C) ......................245mW
Operating Temperature Range ....................................-40 to +85
Junction Temperature ............................................................. +150
Storage Temperature Range ......................................-65 to +150
Lead Temperature (soldering, 10s) ..........................................+300
GATE to GND .................................................................-0.3V to +12V
EN, FLAG to GND .............................................................-0.3V to +6V
Continuous Power Dissipation (TA = +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C) ......................245mW
Operating Temperature Range ....................................-40 to +85
Junction Temperature ............................................................. +150
Storage Temperature Range ......................................-65 to +150
Lead Temperature (soldering, 10s) ..........................................+300
MAX4838 Features
·Overvoltage Protection Up to 28V
·Preset 7.4V or 5.8V Overvoltage Trip Level
·Drive Low-Cost NMOS FET
·Internal 50ms Startup Delay
·Internal Charge Pump
·Undervoltage Lockout
·15kV ESD-Protected Input
·Voltage Fault FLAG Indicator
·6-Pin SC70 Package
·Preset 7.4V or 5.8V Overvoltage Trip Level
·Drive Low-Cost NMOS FET
·Internal 50ms Startup Delay
·Internal Charge Pump
·Undervoltage Lockout
·15kV ESD-Protected Input
·Voltage Fault FLAG Indicator
·6-Pin SC70 Package
MAX4838 Typical Application
·Cell Phones
·Digital Still Cameras
·PDAs and Palmtop Devices
·MP3 Players
·Digital Still Cameras
·PDAs and Palmtop Devices
·MP3 Players
MAX4838 Connection Diagram
MAX4838
PDF/DataSheet Download
- Datasheet: MAX4838
- File Size: 232900 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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