Industrial Octal High-Side Switch with Advanced Diagnostics

The MAX22915 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 option to average multiple ADC conversions. The MAX22915 provides flexible configurations and global diagnostics, which include undervoltage warnings, thermal condition reportings, and communication errors.

Each channel is equipped with overload, overcurrent and short-to-VDD detections, as well as open-wire detection that can detect an open-wire fault condition when 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 MAX22915 utilizing a common chip select (CS). The 16-LED driver matrix provides indications of per-channel fault and status. Internal active clamps allow for fast turn-off of inductive loads. Integrated ESD and surge protection requires only a single TVS on VDD. The MAX22915 is available in a compact 50-pin 6mm × 7mm flip chip QFN package.

APPLICATIONS

* Industrial Digital Outputs

* PLC Systems

* Robustness with Extensive Diagnostics

* 7-bit ADC to Monitor Chip Temperature, Per-Channel Output Current or VDD Supply Voltage

* Per-Channel Open-Wire Detection with Switches On, Off, or Toggling at up to 131Hz

* Per-Channel Overload, Overcurrent and Short-to-VDD Fault Detection

* CRC Error Checking on 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 VDD 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 Single TVS on VDD

* 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