High-Side Switch Controller with Current Limiting

 

Part Number	Replacement	Explanation

Description

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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 R_ON 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 (C_BLANK at t_BLANK 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 R_ON 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.

Key Features

• +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 R_ON FETs Having Q_g (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

Applications/Uses

• Industrial Digital Outputs
• High-Side Switches
• Motor Holding Brakes
• Relay and Solenoid Drivers