Low On-Resistance, Bidirectional Overvoltage Protector with Current Sense

Integrated Low RON OVP with Current Sense for Direct Charging


The MAX20305/MAX20306 are overvoltage protectors that provide protection against positive voltages fault up to +28VDC to valuable consumer circuits. An internal clamp also protects the devices from surges up to ±100V. An overcurrent flag can be used to shut down the part.

The devices feature reverse-bias-blocking capability. Unlike other overvoltage protectors, when the devices are disabled, the voltage applied to OUT does not feed back into the VBUS side. The devices also feature OTG enable (OTG_EN) that allows OUT voltage to supply VBUS when OUT is higher than output startup voltage.

These overvoltage-protection devices feature high voltage, low on-resistance (23mΩ, 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. These devices also have thermal shutdown protection against overload conditions.

The overvoltage-protection threshold can be adjusted to any voltage between 3.5V and 5.5V with optional external resistors. The devices automatically choose the accurate internal trip thresholds when the overvoltage-lockout input is set lower than the external OVLO select voltage. The internal OVLO is preset to 4.7V (typ).

These devices are available in a 30-bump (2.65mm x 2.23mm) wafer-level package (WLP) and operate over the -40°C to +85°C extended temperature range.

Key Features

  • Protect Portable Devices
    • Wide Operating Input Voltage Operation: +3V to +28V
    • 6A Continuous-Current Capability
    • Integrated 23mΩ (typ) On-Resistance
  • Flexible Overvoltage Protection
    • Wide, Adjustable OVLO Threshold Range: +3.5V to +5.5V
    • OTG Enables OUT to Supply VBUS
    • Preset Accurate Internal OVLO
  • Additional Protection Features Increase System Reliability
    • Surge Immunity Over 100V
    • Soft-Start to Minimize In-Rush Current
    • ±10% Accurate Current Sense Output and Shutdown Input
    • Thermal Shutdown Protection
    • Flag Output: Active-Low OVPF, OCF, NCF, Active-Low ACOK (MAX20305)
    • Power-OK (POK) 4V Regulated Output (MAX20306)
  • Space-Saving
    • 30-Bump (2.65mm x 2.23mm)


  • Phablets
  • Smart Phones
  • Tablets
Part Number Channels VIN
Over Voltage Trip Level
Under Voltage Lockout
tGATE (On)
tGATE (Off)
Oper. Temp.
min max
MAX20305  1 -0.3 29 Adjustable (4.7V) 2 4 0.2 -40 to +125
See All Overvoltage Protection Controllers (73)
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.

MAX20305EVKIT: Evaluation Kit for the MAX20305 and MAX20306
MAX20306EVKIT: Evaluation Kit for the MAX20305 and MAX20306

Quality and Environmental Data

Product Reliability Reports: MAX20306.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

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