Analog Devices / Maxim Integrated MAX22915 Industrial Octal High-Side Switch

Analog Devices MAX22915 Industrial Octal High-Side Switch is an industrial output device with eight high-side switches. Each channel is specified to handle up to 1A (typ.) of continuous current, with an on-resistance of 120mΩ (typ.) and 250mΩ (max.) at 125°C.

The MAX22915 has a built-in 7-bit ADC to monitor chip temperature, per-channel output current, or VDD supply voltage. It supports continuous or on-demand monitoring, with the option to average multiple ADC conversions. The MAX22915 provides flexible configurations and global diagnostics, including undervoltage warnings, thermal condition reports, and communication errors.

Each channel is equipped with overload, overcurrent, and short-to-VDD detection, as well as open-wire detection that can detect an open-wire fault condition when the switch is on, off, or toggling at up to 131Hz. Moreover, these diagnostics have enhanced immunity to IEC 61000-4-4 EFT and IEC 61000-4-6 conducted RF.

The SPI interface has a built-in chip-addressing decoder, which allows communication with two MAX22915s using a common chip select (CS). The 16-LED driver matrix provides per-channel fault and status indications. Internal active clamps allow for fast turn-off of inductive loads. Integrated ESD and surge protection requires only a single TVS on V_DD. The Analog Devices MAX22915 is available in a compact 50-pin 6mm × 7mm flip chip QFN package.

Features

Robustness with extensive diagnostics
- 7-bit ADC to monitor chip temperature, per-channel output current, or V_DD supply voltage
- Per-channel open-wire detection with switches on, off, or toggling at up to 131Hz
- Per-channel overload, overcurrent, and short-to-V_DD fault detection
- CRC error checking on the SPI interface
- Watchdog timer on SPI and SYNCH pin
- Thermal shutdown protection and adjustable thermal warning reporting
- 65V absolute maximum supply range
- Internal clamps for fast inductive load demagnetization
- UVLO warning on supply voltages
- Loss of V_DD or GND protection
- Integrated IEC 61000-4-2 ESD protection at ±8kV contact and ±15kV air-gap
- Integrated IEC 61000-4-5 surge protection at ±1kV/42Ω using a single TVS on V_DD
- Enhanced EFT and RF conducted immunity on per-channel diagnostics with switches on, off, or toggling at up to 131Hz
- -40°C to +125°C operating temperature range

Reduced power and heat dissipation
- Active current limiting at 1A (typ.), 1.3A (max.)
- 5mA (typ.) supply current
- 250mΩ (max.) on-resistance at +125°C
Flexibility and space saving
- Selectable VM_ supply voltage monitoring
- Selectable open-wire detection thresholds
- Selectable output current measurement full-scale range
- SYNCH input for simultaneous update of OUT_
- LED driver matrix for 16 fault and status LEDs, powered by 24V, 5V, or 3.3V
- Flexible logic supply voltage from 2.5V to 5.5V
- Addressable SPI reduces isolation cost
- Compact 6mm × 7mm FCQFN package