MAX4843

Overvoltage Protection Controllers with Low Standby Current

Industry's Smallest Overvoltage Protection Controllers


Please check latest availability status for a specific part variant.

Description

The MAX4843–MAX4846 overvoltage protection controllers protect low-voltage systems against high-voltage faults of up to 28V. When the input voltage exceeds the overvoltage threshold, these devices turn off a 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 overvoltage trip level is set to 7.4V (MAX4843), 6.35V (MAX4844), 5.8V (MAX4845), or 4.65V (MAX4846). When the input voltage drops below the undervoltage lockout (UVLO) threshold, the devices enter a low standby current mode (10µA). The MAX4843/MAX4844/MAX4845 have a UVLO threshold of 4.15V, the MAX4845C/MAX4845D have a UVLO threshold of 2.2V, and the MAX4846 has a UVLO threshold of 2.5V. 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.

An additional feature includes a ±15kV ESD-protected input when bypassed with a 1µF capacitor to ground. All devices are offered in small 6-pin µDFN (1.5mm x 1.0mm) and 6-pin ultra-thin LGA (MAX4845EYT+T only) (1.5mm x 1.0mm) packages and are specified for operation over the -40°C to +85°C temperature range.
MAX4843, MAX4844, MAX4845, MAX4846: Typical Operating Circuit MAX4843, MAX4844, MAX4845, MAX4846: Typical Operating Circuit Enlarge+

Key Features

  • Overvoltage Protection Up to 28V
  • Preset 7.4V, 6.35V, 5.8V, or 4.65V Overvoltage Trip Level
  • Low (10µA) Undervoltage Lockout Standby Current
  • Drives Low-Cost nMOSFET
  • Internal 50ms Startup Delay
  • Internal Charge Pump
  • Overvoltage Fault FLAG Indicator
  • 6-Pin (1.5mm x 1.0mm) µDFN Package

Applications/Uses

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

See parametric specs for Overvoltage Protection Controllers (74)


Part NumberChannelsVIN
(V)
VIN
(V)
Over Voltage Trip Level
(V)
Under Voltage Lockout
(V)
VGATE
(V)
Over Volt. FlagtGATE (On)
(ms)
tGATE (Off)
(µs)
Package/PinsBudgetary
Price
minmaxSee Notes
MAX4845 11.2285.84.1510Open-Drain106
UDFN/6
ULTRA THIN LGA/6
$1.10 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Request Reliability Report for: MAX4843 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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