IR3220S

Designing safe and reliable automotive motor drive circuits up to 80W can rapidly become a complex task involving a multitude of components and requiring experience in power electronics, controls and thermal design. IR3220S is a cost effective solution that provides a rugged design with benchmark electrical characteristics. The resulting H-bridge circuit is easy to design and fits within 21mm x 25mm or less than one square inch as much as 80% smaller than a discrete circuit.

Rated at 35V, the IR3220S integrates an H-bridge controller with two very efficient high-side MOSFETs and two low-side MOSFET drive outputs in a single 20-pin package and cuts component count by as much as 80%. IR3220S combines with 2 low side IRF7484 MOSFETs and as few as 4 external passive components to provide a complete, fully-operational and fullyprotected H-Bridge controller. The IR3220S incorporates forward, reverse, braking and nonbraking for standalone controller, yet readily interfaces with a microcontroller as a high performance motor control peripheral.

Shoot-through, over-temperature and 30A overcurrent protection, over-voltage clamp and under-voltage lock-out for both the high- and low-side are built-in to deliver a rugged H-Bridge design. The innovative shoot-through operates independently on each leg of the H-bridge, eliminating diagonal commands for robust protection with a variety of loads. In addition, the programmable soft-start sequence limits in-rush currents. The high-side and low-side MOSFETs use planar technology rated for repetitive avalanche energy up to T_j max.

The thermal design of the H-bridge circuit using the IR3220S is simplified with the availability of low-side MOSFETs specifically designed to operate with the IR3220S. The IR3220S offers high efficiency in an integrated solution with 13mΩ on-resistance for the high-side MOSFETs and an approximate on-resistance of 7mΩ for the low side switches. The low on-resistance, soft-start function reduce heat generated during start-up and continuous-duty operation (6A at 85°C junction temperature), eliminating heat sink requirements. The sleep mode with less than 10µA leakage current makes IR3220S H-bridge circuits ideal for direct battery connection.

Typical H-Bridge Driver Circuit
Using the IR3220S and
IRF7484 HEXFET® Power MOSFETs

THE IR ADVANTAGE

	High functionality H-bridge controller cuts part count and simplifies circuits, compared to discrete solutions
	Enables a 6A bridge circuit in a 21mm x 25mm area
	Complete shoot-through, over-temperature and over-current protection enables rugged designs
	Soft-start current limiting
	Ultra-low on-resistance and sleep mode maximize efficiency and minimize standby losses
	Simple thermal design eliminates heatsink requirements in continuous, 6A operation up to 85°C

APPLICATIONS
6A, 14V/24V DC motors and actuators used in automotive applications such as:
	Fuel, water, vacuum pumps
	Compressors
	Throttle control
	Power seats
	Door locks
	Window lifters
	Automatic sunroof
	Windshield wipers and others