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Analog Devices Inc. MAX16170 High-Voltage Ideal Diode Controller offers complete system-level protection for automotive applications. The 4mm x 4mm x 0.75mm, 20-pin, side-wettable, TQFN packaged MAX16170 enhances system safety, reliability, and performance with added diagnostics, robust fault-recovery mode, and a high-side, integrated current-sense amplifier (CSA). The MAX16170 features a dual-gate-driver topology that supports common-drain configuration and protects systems against reverse voltage, input overvoltage (OV), undervoltage (UV), overcurrent, and thermal fault conditions. During power-up, the device monitors the health of the external power metal-oxide-semiconductor field effect transistors (MOSFETs) for open or short circuit conditions. It asserts an open-drain output (FETOK) when one or both power MOSFETs are damaged. Additionally, the device offers an open-drain fault output (FLT) that asserts low when there is a faultcondition.
During normal operation, the MAX16170 regulates the voltage drop across the drain-to-source of MOSFET (Q1) to 10mV to block DC flow to the battery in reverse voltage fault conditions. A resistor from a low-voltage input (ILIM) to ground sets the overcurrent threshold. During sleep mode operation, the device consumes only 5uA (typical) while delivering 1mA (minimum) of current to the load to support stand-by system operation. In shutdown mode, the charge pump is disabled, and the OV and UV resistive dividers are disconnected from the battery through the TERM switch to lower the shutdown supply current to 3µA (typical).
