Eight-channel high-side switch

25 February 2015 Power Electronics / Power Management

The MAX14900E from Maxim Integrated is an octal power switch that features per-channel configuration for high-side or push-pull operation. Fast load switching with low propagation delay makes the device suitable for high-speed PLC systems, high-density digital output modules, motor controllers and PWM/PPO control.

Each high-side switch sources 850 mA continuous current with a low 165 mΩ on-resistance at 500 mA and 125°C. These switches feature 2 μs (maximum) input-to-output propagation delay when driving resistive loads. Long cables can be driven with switching rates of up to 100 kHz for PWM/PPO control in push-pull operation. Multiple high-side switches can be connected in parallel to achieve higher drive currents.

The IC is configured, monitored and driven by an SPI and/or parallel interface. In parallel mode, eight logic inputs directly control the outputs and the serial interface can be used for configuration/monitoring. Serial mode utilises the serial interface for both setting and configuration, and features CRC error detection to ensure robust SPI communication. The device features a global diagnostics output as well as per-channel diagnostics and monitoring through the serial interface.

The MAX14900E features a wide supply input range of 10 V to 36 V, with current limiting and per-channel thermal shutdown protecting each switch/driver. It is available in a thermally enhanced 48-pin (7 x 7 mm), side-wettable flank QFN-EP or standard 48-pin TQFN-EP package, and is specified over the -40°C to +125°C temperature range.

For more information contact Arnold Perumal, Avnet Kopp, +27 (0)11 319 8600, [email protected], www.avnet.co.za

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