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MAX5901LBEUT-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX5901LBEUT-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 14 page allowing the voltage on the load, i.e. the drain of the MOSFET, to fall no faster than 10V/ms (typ). The inrush current to the load is thus limited to a level proportional to the load capacitance, and the constant load voltage slew rate. After the MOSFET is fully enhanced, and the load voltage is settled to its final value, the MAX5900A/ MAX5901A and MAX5900L/MAX5901L monitor the volt- age drop from the MOSFET’s drain-to-source (VDS). If the voltage drop exceeds 75% of the circuit-breaker threshold the MAX5900A/MAX5901A or MAX5900L/ MAX5901L turn off the MOSFET, disconnecting the load immediately. Because the circuit-breaker function is not activated until the MOSFET is fully enhanced, it takes approximately 10ms for the MAX5900A/ MAX5901A or MAX5900L/MAX5901L to react to an out- put short circuit at startup. If no circuit-breaker fault exists, the power-good output is asserted. Then, if any of four conditions exist, the power-good output deasserts and the MOSFET is turned off . The four con- ditions are: the voltage across the MOSFET exceeds the circuit-breaker threshold; the supply voltage magni- tude falls below the undervoltage lockout level; the die temperature exceeds +125°C; or ON/OFF is forced low. After a circuit-breaker fault, the MAX5900L/MAX5901L keep the MOSFET off until the power is cycled, or the part is reset by toggling ON/OFF low for at least 20ms (typ). After a circuit-breaker fault, the MAX5900A/ MAX5901A automatically restart in 300ms (typ). All ver- sions automatically restart after a thermal fault, or an undervoltage shutdown, if the fault condition goes away for at least 300ms (typ). ON/OFF offers external control of the MAX5900/ MAX5901, facilitating power-supply sequencing, and may also be used to change the UVLO level. UVLO keeps the external MOSFET switched off as long as the magnitude of the input voltage is less than a desired level. A power-good output, PGOOD (MAX5900) or PGOOD (MAX5901), asserts when the external MOSFET is fully enhanced and the drain-source voltage is at least 25% below the circuit-breaker threshold. PGOOD and PGOOD are open-drain outputs referenced to VEE, and can withstand up to 100V above VEE. A thermal shutdown feature protects the external MOS- FET by turning it off if the die temperature of the MAX5900/MAX5901 exceeds +125°C. The MAX5900/ MAX5901 must be in good thermal contact with the external MOSFET. See the Layout Guidelines section in the Applications Information. A circuit-breaker function monitors the voltage across the external MOSFET, VDS, and turns off the MOSFET if VDS exceeds the circuit-breaker threshold, VCB. The circuit-breaker function is enabled after the MOSFET is fully enhanced. Three threshold voltage options are available—200mV, 300mV, and 400mV. One version is available with no circuit-breaker function. circuit-break- er fault management for the MAX5900/MAX5901 is offered with two different configurations—latched and automatic retry. Latched Circuit Breaker After a circuit-breaker trip event, the latched versions (MAX5900L/MAX5901L) drive GATE to VEE, turning off the external MOSFET, and PGOOD (PGOOD) is deasserted. A latched-off condition needs to be reset by toggling ON/OFF low for at least 20ms, or by cycling the power supply, VEE. Automatic Retry Circuit Breaker After a circuit-breaker trip event, the automatic retry versions (MAX5900A/MAX5901A) drive GATE to VEE, turning off the external MOSFET, and PGOOD (PGOOD) is deasserted. If the start conditions are met for a full 300ms (tRS) the start sequence is initiated. The start conditions are: the device is not in UVLO; ON/OFF is not driven low; and the device is not in thermal shut- down. No Circuit Breaker For the versions without a circuit-breaker MAX5900N (MAX5901N), PGOOD (PGOOD) is asserted when the MOSFET is fully enhanced. Once powered up, the MAX5900N/MAX5901N ignore the MOSFET drain-to- source voltage (VDS) for applications where a circuit- breaker function is not desired. Applications Information ON / OFF Control Input The ON/OFF control input provides three hot-swap functions: external ON/OFF control; setting of the UVLO level; and resetting after a circuit-breaker event has caused the MAX5900L/MAX5901L to turn off the exter- nal MOSFET. Pulling ON/OFF to VEE for at least 20ms (tOFF) forces the MAX5900/MAX5901 to turn off the external MOSFET (see Figure 2 for a circuit example). To reset the MAX5900L/MAX5901L after a circuit- breaker event, toggle ON/OFF to VEE for at least 20ms (tOFF). ON/OFF can be used to sequence power supplies. Connecting a capacitor from ON/OFF to VEE will delay the rise of ON/OFF proportional to the capacitance and input impedance of ON/OFF, typically 32k Ω (Figure 3). -100V, SOT23/TDFN, Simple Swapper Hot-Swap Controllers 6 _______________________________________________________________________________________ |
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