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Overvoltage Protection Controllers with Status FLAG

Product Details

Key Features

Parametric specs for Overvoltage Protection Controllers
# Channels 1
VIN (V) (min) 1.2
VIN (V) (max) 28
Over Voltage Trip Level (V) 7.4
Under Voltage Lockout (V) 3.25
VGATE (V) 10
Over Volt. Flag Open-Drain
tGATE (On) (ms) 10
tGATE (Off) (µs) 6
Package/Pins SC70/6
Budgetary
Price (See Notes)
1.29
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Simplified Block Diagram

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Parameters

Parametric specs for Overvoltage Protection Controllers
# Channels 1
VIN (V) (min) 1.2
VIN (V) (max) 28
Over Voltage Trip Level (V) 7.4
Under Voltage Lockout (V) 3.25
VGATE (V) 10
Over Volt. Flag Open-Drain
tGATE (On) (ms) 10
tGATE (Off) (µs) 6
Package/Pins SC70/6
Budgetary
Price (See Notes)
1.29

Key Features

  • Overvoltage Protection Up to 28V
  • Preset 7.4V, 5.8V, or 4.7V Overvoltage Trip Level
  • Drive Low-Cost NMOS FET
  • Internal 50ms Startup Delay
  • Internal Charge Pump
  • Undervoltage Lockout
  • 15kV ESD-Protected Input
  • Voltage Fault active-low FLAG Indicator
  • 6-Pin SC70 Package

Applications/Uses

  • Cell Phones
  • Digital Still Cameras
  • MP3 Players
  • PDAs and Palmtop Devices

Description

The MAX4838–MAX4842 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 MAX4838–MAX4842 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. The MAX4842 has a 4.7V overvoltage threshold. The MAX4838–MAX4841 have an undervoltage lockout (UVLO) threshold of 3.25V while the MAX4842 has a UVLO of 3.0V. 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. Active-low FLAG is held low for an additional 50ms after GATE goes high before deasserting. The MAX4838/MAX4840/MAX4842 have an open-drain active-low FLAG output, and the MAX4839/MAX4841 have a pushpull FLAG output. The active-low 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 (active-low EN) to turn off the device (MAX4838/MAX4840/MAX4842).

All devices are offered in a small 6-pin SC70 package and are specified for operation from -40°C to +85°C.

Simplified Block Diagram

MAX4838, MAX4839, MAX4840, MAX4841: Typical Operating Circuit MAX4838, MAX4839, MAX4840, MAX4841: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .