Diodes Incorporated ZXMS81045SP IntelliFET® High-Side Power Switch

Diodes Incorporated ZXMS81045SP IntelliFET® High-Side Power Switch combines protective and diagnostic functions in a SO-8EP (Type E) exposed heatsink package. The ZXMS81045SP offers a monolithic N-channel vertical power MOSFET with integrated temperature and current sensors with a charge-pumped gate supply. It has a low quiescent current in the OFF state. The switch is enabled by active high 3.3V and 5V logic level drive to the inputs.

The Diodes Inc ZXMS81045SP features a diagnostic current-sense output proportional to load current and a defined diagnostic fault signal in case of overload operation, overtemperature, short-circuit, or open load conditions.

Features

Protection functions
- Reverse battery protection using external components
- Voltage-dependent current limiting
- Overtemperature protection with auto-restart
- Overvoltage protection, including load dump
- Stable undervoltage protection
- ESD protection
- Loss of ground protection with external components
- Enhanced short-circuit protection
Defined fault signal in case of overload operation, overtemperature, or short-circuit

Diagnostic functions
- Proportional load current-sense output
  - Linear voltage drop regulation to maintain sense accuracy even at very low load currents
  - Enabled by a logic input
  - Defined temperature and current dependency
- Open-load detection
  - Using load current-sense in ON state
  - Using output voltage detection in the OFF state

Applications

High-side switching with diagnostic feedback for:
- 12V grounded loads
- Resistive, inductive, and capacitive loads
Suitable for high inrush current loads
- Incandescent lamps (P27W/P21W), motors, etc.

Compact low-power replacement for:
- Relays, fuses, and discrete circuits

Specifications

5V to 28V operating voltage
41V maximum supply voltage
90mΩ maximum ON resistance, T_j = +150°C
4A nominal load current

1200 typical current sense ratio
25A minimum current limitation
0.5µA maximum standby current, T_j = +25°C

Diodes Incorporated ZXMS81045SP IntelliFET® High-Side Power Switch

Features

Applications

Specifications

Typical Application Circuit

Functional Block Diagram

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