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High-Side Switch Controller with Current Limiting

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

Product Details

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.

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 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

Applications/Uses

  • Industrial Digital Outputs
  • High-Side Switches
  • Motor Holding Brakes
  • Relay and Solenoid Drivers
Parametric specs for Digital I/O
Digital Input/Output Digital Output
Interface Type CMOS
# Channels 1
VSUPPLY (V) (min) 9
VSUPPLY (V) (max) 70
ISUPPLY (µA) (typ) 1.8
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/16
Budgetary
Price (See Notes)
$1.88 @1k
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Technical Docs

Design & Development

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Description

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.

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Features

  • 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

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Support & Training

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Parameters

Parametric specs for Digital I/O
Digital Input/Output Digital Output
Interface Type CMOS
# Channels 1
VSUPPLY (V) (min) 9
VSUPPLY (V) (max) 70
ISUPPLY (µA) (typ) 1.8
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/16
Budgetary
Price (See Notes)
$1.88 @1k

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 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

Applications/Uses

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

Description

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.

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