Simplest, smallest OR-ing MOSFET Controllers with Fastest Reverse-Current Protection
Critical loads often employ parallel-connected power supplies with redundancy in order to enhance system reliability. The MAX8535/MAX8536/MAX8585 are highly integrated but inexpensive MOSFET controllers that provide isolation and redundant power capability in high-reliability systems. The MAX8535/MAX8585 are used in 12V systems, and have an internal charge pump to drive the gates of the n-channel pass elements to VCC + 10V. The MAX8536 is used in 3.3V and 5V systems, with a chargepump output of VCC + 5V. During startup, the MAX8535/MAX8536/MAX8585 monitor the voltage drop across external MOSFETs. Once VCC approaches or exceeds the bus voltage, the MOSFETs are turned on. The MAX8535/MAX8536/MAX8585 feature a dual-purpose TIMER input. A single external resistor from TIMER to ground sets the turn-on speed of the external MOSFETs. Optionally, the TIMER input can be used as a logic-enable pin. Once the device is turned on, the MAX8535/MAX8536/MAX8585 monitor the load, protecting against overvoltage, undervoltage, and reverse-current conditions. Overvoltage and undervoltage fault thresholds are adjustable and can be disabled. The current-limit trip points are set by the external MOSFETs' RDS(ON), reducing component count. An open-drain logic-low fault output indicates if an overvoltage, undervoltage, or reverse-current fault occurs. All devices come in a space-saving 8-pin µMAX® package and are specified over the extended -40°C to +85°C temperature range.
title | Download file |
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MAX8535-MAX8585 Data Sheet | MAX8535-MAX8585.pdf |
Part Number | Reverse Current Protect. | Under Voltage Protect | Charge Pump Cap. | Soft Start | Enable | Fault Indicator | Package/Pins | Oper. Temp. (°C) | Budgetary Price |
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See Notes | |||||||||
MAX8535 | Yes | Yes | Yes | Yes | Yes | Yes | µMAX/8 | -40 to +85 | $1.83 @1k |
MAX8536 | µMAX/8 | $2.50 @1k | |||||||
Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
---|---|---|---|---|---|
MAX8535AEUA | No Longer Available | MAX8535AEUA+ | µMAX,;8 pin;15.6 mm² | -40°C to +85°C | No |
MAX8535AEUA+ | Active | µMAX,;8 pin;15.6 mm² | -40°C to +85°C | Lead Free | |
MAX8535AEUA+T | Active | µMAX,;8 pin;15.6 mm² | -40°C to +85°C | Lead Free | |
MAX8535AEUA-T | No Longer Available | MAX8535AEUA+T | uMAX;8 pin | -40°C to +85°C | See data sheet |
MAX8535EUA | No Longer Available | MAX8535EUA+ | µMAX,;8 pin;15.6 mm² | -40°C to +85°C | No |
MAX8535EUA+ | Active | µMAX,;8 pin;15.6 mm² | -40°C to +85°C | Lead Free | |
MAX8535EUA+T | Active | µMAX,;8 pin;15.6 mm² | -40°C to +85°C | Lead Free | |
MAX8535EUA-T | No Longer Available | MAX8535EUA+T | µMAX,;8 pin;15.6 mm² | -40°C to +85°C | No |