MAX14922

PRODUCTION

High-Side Switch Controller with Current Limiting

Very Robust High-Side Controller Great for Motor Holding Brake Applications

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • +9V to +70V Operating Supply Range
  • 5V / 50mA Integrated Linear Regulator
  • -40°C to +125°C Ambient Temperature Operating Range
  • 16-TQFN Package, 3mm x 3mm, 0.5mm Pin Pitch
  • Robust Design Features
    • Ultra High-Speed Inductive Load Turn-Off by Clamping to -70V
    • Supply Independent Inductive Clamping
    • Support of Low RON FETs Having Qg (Total) = 50nC
    • External FET Turn-On Propagation Delay < 20μs
    • Active Current Limit Control During Overcurrent
  • Fault Monitoring Diagnostic Features
    • Overcurrent Detect Output
    • High Supply-Voltage Indication
    • Flexible Supply or Load Voltage Monitor
    • Undervoltage Lockout
    • Thermal Warning and Shutdown Protection
    • Device Ready Indication

The MAX14922 is a high-side, n-channel FET controller for implementing industrial high-side switches for switching ground-connected loads. The MAX14922 device controls an external nMOS power transistor, allowing low RON high-side switch applications from a +9V to +70V supply range.

Fast inductive load turn-off can be achieved with use of a high-voltage TVS diode enabling up to -70V (max) voltage clamping. Ground-connected TVS diodes allow clamping of exceptionally high inductive energies.

Load current is limited to a user-defined value through a sense resistor. External FET overload protection is achieved using an auto-retry timing feature, as defined by a user-selected capacitor (CBLANK at tBLANK input) or optionally using an external timing control.

The MAX14922 features an on-chip comparator enabling monitoring of the high-side switch output or the supply input voltage with a user-selected threshold. An integrated charge pump enables high speed switching rates when using low RON FETs in the 20kHz to 50kHz range.

The MAX14922 is available in a 3mm x 3mm, 16-TQFN package. The MAX14922 device is specified over the -40°C to +125°C operating temperature range.

Applications

  • Industrial Digital Outputs
  • High-Side Switches
  • Motor Holding Brakes
  • Relay and Solenoid Drivers
MAX14922
High-Side Switch Controller with Current Limiting
MAX14922 Simplified Block Diagram MAX14922 Block Diagram MAX14922 Pin Configuration
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 2

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Evaluation Kits

MAX14922EVKIT

Evaluation Kit for the MAX14922

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Features and Benefits

  • Robust Operation with Wide Range of Input Voltages and Load Conditions
  • Safety and Protection Device Included for +24V Supply Evaluation with Up To ±1.2kV IEC 61000-4-5 at Source to Ground
  • Fast Inductive Load Demagnetization
  • LED Indication of Status and Fault Conditions • Overvoltage
    • Overcurrent
    • Ready
    • Thermal warning Fault Condition Indication
  • Included Si7322DN FET with Placement Option to Include TO-252 Package FETs
  • Autoretry Option Using a tBLANK Feature During Overcurrent Conditions
  • Optional On-Chip +5V Logic from MAX14922
  • +2.5V to +5.5V Wide Logic-Voltage Range
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX14922 evaluation kit (EV kit) provides a proven design to evaluate the MAX14922 industrial-grade high- side switch controller for ground connected resistive, inductive, and capacitive loads with diagnostics.

The MAX14922 EV kit must be powered from an external +24V power supply and can draw more than 10A when fully loaded.

The EV kit PCB comes with the MAX14922ATE+ (16 TQFN, 3mm x 3mm) device installed, and includes Si7322DN, n-channel FET and PCB space for a power FET in a TO-252/DPAK/SOT428 package, enabling easy and simple evaluation of the device with loads.

Applications

  • High-Side Switches
  • Industrial Digital Outputs
  • Motor Holding Brakes
  • Relay and Solenoid Drivers
MAX14922EVKIT
Evaluation Kit for the MAX14922

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