MAX16914

The MAX16914/MAX16915 low-quiescent-current overvoltage and reverse-battery protection controllers are designed for automotive and industrial systems that must tolerate high-voltage transient and fault conditions. During high-voltage fault conditions, the controllers regulate the output voltage to the set upper threshold voltage (MAX16915), or switch to high resistance (MAX16914)for the duration of the overvoltage transient to prevent damage to the downstream circuitry. The overvoltage event is indicated through an active-low, open-drain output, OV. The reverse-battery pFET behaves as an ideal diode, minimizing the voltage drop when forward biased. Under reverse bias conditions, the pFET is turned off, preventing a downstream tank capacitor from being discharged into the source. Shutdown control turns off the IC completely, disconnecting the input from the output and disconnecting TERM from its external resistor-divider to reduce the quiescent current to a minimum. Both devices are available in a 10-pin FMAX M package and operate over the automotive -40°C to +125°C temperature range. These conditions include load dumps, voltage dips, and reversed input voltages. The controllers monitor the input voltage on the supply line and control two external pFETs to isolate the load from the fault condition. The external pFETs are turned on when the input supply exceeds 4.5V and stay on up to the programmed overvoltage threshold.

The features of MAX16914 can be summarized as (1)4.5V to 19V input voltage operation; (2)transient voltage protection up to +44V and -75V; (3)adjustable overvoltage limit with resistor- divider shut off in shutdown; (4)ideal diode reverse-battery protection; (5)low voltage drop when used with properly sized external pFETs; (6)back-charge prevention; (7)overvoltage indicator; (8)shutdown input; (9)29A low operating current; (10)6A low shutdown current; (11)Thermal-Overload Protection; (12)-40°C to +125°C operating temperature range; (13)small 10-pin MAX Package; (14)AEC-Q100 qualified.

The absolute maximum ratings of MAX16914 are (1)VCC, SENSE OUT, TERM, SHDN, OV to GND for P 400ms: -0.3V to +44V; (2)VCC, SENSE OUT, TERM, SHDN, OV to GND for P 90s: -0.3V to +28V; (3)VCC, SENSE OUT, TERM, SHDN, OV to GND: -0.3V to +20V; (4)SENSE IN to GND for P 2ms: -75V to +44V; (5)SENSE IN to GND for P 90s: -18V to +44V; (6)SENSE IN to GND: -0.3V to +20V; (7)GATE1, GATE2 to VCC: -16V to +0.3V; (8)GATE1, GATE2 to GND: -0.3V to (VCC + 0.3V); (9)SET to GND: -0.3V to +8V; (10)continuous power dissipation (TA = +70°C)10-Pin FMAX (derate 8.8mW/°C above TA = +70°C)(Note 1): 707mW; (11)operating temperature range: -40°C to +125°C; (12)junction temperature: +150°C; (13)storage temperature range: -65°C to +150°C; (14)lead temperature (soldering, 10s): +300°C.