IR3313/14/15/16

The IR331x family are highly efficient high side power switches that feature integrated programmable over-current protection, over-temperature protection, and active overvoltage clamping. In addition, the IR331x family provides a current feedback output with +/- 5% accuracy over the full operating temperature range (@max. load current) compared to about +/-20% for competitive devices. This accuracy combined with integrated programmable over-current shutdown enables the IR331x switches to protect not only itself but also the load by optimizing the shutdown threshold.

The current feedback feature allows precise current monitoring and control for a very cost effective solution in many applications. With +/- 5% accuracy and 100 kHz bandwidth, the current feedback signal may be used by a standard PWM control IC, ASIC, or microcontroller to implement high-performance functionality from wide bandwidth closed-loop current control of a motor load to basic load fault detection. Implementing current sense functions with the IR331x family eliminates the power loss of a shunt resistor or cost of a Hall sensor.

The IR331x devices are specifically designed for automotive 14V applications where a protection is required in order to prevent the IC and the application from damage in case of short circuits on the line, or by overload. The integrated over-temperature protection and programmable over-current shutdown features save additional fuses and wiring harness, improving the system reliability. Additional integrated features like ESD, reverse battery and active clamp guarantee protection even under harsh automotive operating conditions.

FEATURES AT A GLANCE

	Integrated charge pump and gate drive for high-side applications
	Load current feedback
	Programmable over-current shutdown
	Over-temperature shutdown
	Active clamp
	Reverse battery protection
	Reverse current capability
	ESD protection

THE IR ADVANTAGE
	+/- 5% current sense feedback accuracy
	100 kHz current feedback bandwidth
	Very low RDS(on) fully protected high-side switch
	Programmable current shutdown
	Simplifies circuits and increases reliability

APPLICATIONS
	Automotive 14V applications
	Body modules
	Intelligent Glow-plug
	Auxiliary PTC heater
	Engine cooling fan
	Interior fan control

IR331X BLOCK DIAGRAM

The input signal is referenced to V_CC. When the input voltage V_CC - V_IN exceeds the specified threshold, the output power MOSFET is turned on. When the V_CC - V_IN is lower than the specified V_IL threshold, the output MOSFET is turned off. Any fault will disable the output MOSFET until V_IN is cycled off, resetting the fault launch. A current proportional to the power MOSFET current is sourced to the ST pin and allows easy measurement of the output current. Over-current shutdown threshold occurs at V_ST - V_IN > 4V. Programming the over-current threshold is achieved by choosing R_ST.