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Overvoltage-Protection Controllers with a Low RON Internal FET

Up to +28V Input Voltage Protection Without External nFET in a Small, 2mm x 1.5mm, 12-Bump WLP

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Input Voltage Protection up to +28V
  • Integrated nFET Switch
  • Reverse Voltage Protection with External pFET
  • Enable Input
  • Preset Overvoltage Protection Trip Level
    • 5.8V (MAX4970)
    • 6.35V (MAX4971)
    • 4.65V (MAX4972)
  • Low-Current Undervoltage-Lockout Mode
  • Short-Circuit Protection (Autoretry)
  • Internal 15ms Startup Delay and Retry Times
  • Input-Voltage Power-Good Logic Output
  • Thermal-Shutdown Protection
  • 2mm x 1.5mm, 12-Bump WLP Package

Applications/Uses

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

Description

The MAX4970/MAX4971/MAX4972 family of overvoltage protection devices features a low 40mΩ (typ) RON internal FET and protect low-voltage systems against voltage faults up to +28V. These devices also drive an optional external pFET to protect against reverse-polarity input voltages. When the input voltage exceeds the overvoltage threshold, the internal FET is turned off to prevent damage to the protected components.

All switches feature a 2.3A (min) current-limit protection. During a short-circuit occurrence, the device operates in an autoretry mode where the internal MOSFET is turned on to check if the fault has been removed. The autoretry interval time is 15ms, and if the fault is removed, the MOSFET remains on.

The MAX4970/MAX4971/MAX4972 feature an enable input (active-low EN) that controls the operation of the internal nFET as well as the optional external pFET. The use of active-low EN allows the external pFET to block reverse voltages independent of any signal present at the output.

The overvoltage thresholds (OVLO) are preset to 4.65V (MAX4972), 5.8V (MAX4970), or 6.35V (MAX4971). The undervoltage thresholds (UVLO) are preset to 2.45V. When the input voltage drops below the UVLO, the devices enter a low-current standby mode.

All devices are offered in a small 12-bump, WLP package and operate over the -40°C to +85°C extended temperature range.

Simplified Block Diagram

MAX4970, MAX4971, MAX4972: Typical Operating Circuit MAX4970, MAX4971, MAX4972: 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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.