Dual-Input, Bidirectional Overvoltage Protector with Automatic Path Control

One OVP to Protect Dual-Input-Powered Portable Devices

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The MAX14727/MAX14728/MAX14731 provide protection to valuable consumer circuits against two positive voltage faults up to +28VDC. An internal clamp also protects the devices from surges up to 100V. The devices automatically select the input source, with channel A being the primary supply.

These devices feature reverse bias-blocking capabilities. Unlike other overvoltage protectors, when the devices are disabled, the voltage applied to OUT does not feed back into either INA or INB. These devices also feature two OTG enable pins (OTG_ENA, OTG_ENB) that allow OUT voltage to supply the corresponding input when OUT is higher than the output startup voltage.

These overvoltage-protection devices feature high-voltage, low on-resistance (73mΩ, typ) internal FETs, effectively minimizing a voltage drop across the device. When the input voltage exceeds the overvoltage threshold, the internal FET is turned off to prevent damage to the protected components. The devices also have thermal-shutdown protection against overload conditions.

The overvoltage-protection threshold can be adjusted with optional external resistors to any voltage between 4V and 14V. The devices automatically choose the appropriate internal trip thresholds when the overvoltage-lockout input is set lower than the external OVLO select voltage. The internal OVLO are preset to 13.75V (typ) (MAX14727), 10V (typ) (MAX14728), or 5.92V (typ) (MAX14731).

The devices are specified over the extended -40°C to +85°C temperature range, and are available in a 30-bump, wafer-level package (WLP).
MAX14727, MAX14728, MAX14731: Functional Diagram MAX14727, MAX14728, MAX14731: Functional Diagram Enlarge+

Key Features

  • Protects Portable Devices with Dual-Input Power
    • Wide Operating Input-Voltage Protection from 3V to 28V
    • 5A Continuous-Current Capability
    • Integrated 73mΩ (typ) nMOSFET Switch
  • Allows Flexible and Precise Design in OVLO Implementation
    • Wide Adjustable OVLO Threshold Range from 4V to 14V
    • OTG Enables Allow OUT Supply INA/INB
    • Preset Accurate Internal OVLO Thresholds:
      • 13.75V ±2% (MAX14727)
      • 10V ±2% (MAX14728)
      • 5.92V ±2% (MAX14731)
  • Increases System Reliability Through Premium Security
    • Surge Immunity Over +100V
    • Soft-Start to Minimize In-Rush Current
    • Internal 15ms Startup Debounce
    • Thermal Shutdown Protection
  • Minimizes Board Space With Compact Package
    • 30-Bump, 2.6mm x 2.2mm WLP


  • e-Readers
  • Smartphones
  • Tablets

See parametric specs for Overvoltage Protection Controllers (74)

Part NumberChannelsVIN
Over Voltage Trip Level
tGATE (On)
tGATE (Off)
minmaxSee Notes
MAX14727 2-0.32913.750.120.2
$1.11 @1k
MAX14728 10
MAX14731 5.9

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.

MAX14727EVKIT: Evaluation Kit for the MAX14727/MAX14728/MAX14731
Request Reliability Report for: MAX14727 
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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