MAX4820ETP+

Overview

The MAX4820ETP+ is an eight-channel, low-side relay driver IC manufactured by Analog Devices Inc. under the Maxim Integrated brand. It operates on a single supply voltage ranging from 2.3 V to 5.5 V and delivers up to 70 mA of output current per channel. The device features a cascadable architecture with a rise and fall time of 2 µs. It is housed in a 20-pin TQFN package with an exposed pad (QFN-EP-20) for enhanced thermal performance. The component supports a wide operating temperature range from -40°C to +85°C and draws a maximum supply current of 70 µA.

Feature Summary

• Eight independent low-side driver channels designed for direct control of electromechanical relays
• Cascadable input logic allows daisy-chaining multiple units to expand channel count without additional control lines
• Integrated protection mechanisms safeguard against over-current and thermal overload conditions

Applications

• Industrial automation systems requiring multi-channel relay switching
• Automotive electronic control units for lighting and accessory management
• Consumer appliances with complex power distribution requirements

Procurement Notes

Verify the specific suffix ETP corresponds to the 20-TQFN package configuration when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor declarations. Ensure the ordering part number matches the exact pinout and thermal pad specifications required by your PCB layout design.

Selection Notes

Select this component when designing circuits that require simultaneous control of multiple relays from a microcontroller with limited GPIO pins. The cascading feature simplifies board routing by reducing the number of control signals needed. Ensure the load current per channel does not exceed the 70 mA limit and that the system voltage remains within the 2.3 V to 5.5 V operational range.

Part Context

This device belongs to the MAX4820 family of relay drivers, which are optimized for low-power, high-density applications. Unlike general-purpose MOSFET drivers, these ICs integrate specific protections tailored for inductive loads like relays. The TQFN package provides a compact footprint suitable for space-constrained portable and industrial electronics.

Replacement Considerations

Check for direct pin-to-pin replacements within the same product family or similar eight-channel low-side drivers from other manufacturers. Verify that alternative components support the same cascading capability and operate within the identical voltage and current specifications.