MAX5978 19-5328 Rev 0 7/10 0 to 16V, Hot-Swap Controller with 10-Bit Current, Voltage Monitor, and 4 LED Drivers General Description Features The MAX5978 hot-swap controller provides complete pro- S Hot-Swap Controller Operates from 0 to 16V tection for systems with a supply voltage from 0 to 16V. S 10-Bit ADC Monitors Load Voltage and Current The device includes four programmable LED outputs. S Circular Buffers Store 5ms of Current and Voltage The IC provides two programmable levels of overcur- Measurements rent circuit-breaker protection: a fast-trip threshold for S Internal Charge Pump Generates n-Channel a fast turn-off, and a lower slow-trip threshold for a MOSFET Gate Drive delayed turn-off. The maximum overcurrent circuit- breaker threshold range is set with a trilevel logic input S Internal 500mA Gate Pulldown Current for Fast 2 Shutdown (IRNG), or by programming through the I C interface. S VariableSpeed/Bilevel Circuit-Breaker The IC is an advanced hot-swap controller that monitors Protection voltage and current with an internal 10-bit ADC, which is continuously multiplexed to convert the output voltage S Precision-Voltage Enable Input and current at 10ksps. Each 10-bit sample is stored in an S Alert Output Indicates Fault and Warning internal circular buffer so that 50 past samples of each Conditions 2 signal can be read back through the I C interface at any S Open-Drain Power-Good Output with time or after a fault condition. Programmable Polarity The device includes five user-programmable digital S Open-Drain Fault Output comparators to implement overcurrent warning and two levels of overvoltage/undervoltage detection. When mea- S Four Open-Drain General-Purpose Outputs Sink sured values violate the programmable limits, an external 25mA to Directly Drive LEDs ALERT output is asserted. In addition to the ALERT sig- S Programmable LED Flashing Function nal, the IC can be programmed to deassert the power- S Latched-Off Fault Management good signal and/or turn off the external MOSFET. 2 S 400kHz I C Interface The IC features four I/Os that can be independently configured as general-purpose input/outputs (GPIOs) or S Small, 5mm x 5mm, 32-Pin TQFN-EP Package as open-drain LED drivers with programmable blinking. These four I/Os can be configured for any mix of LED Applications driver or GPIO function. Blade Servers The device is available in a 32-pin thin QFN-EP pack- DC Power Metering age and operates over the -40NC to +85NC extended Disk Drives/DASD/Storage Systems temperature range. Soft-Switch for ASICs, FPGAs, and Ordering Information Microcontrollers Network Switches/Routers PART TEMP RANGE PIN-PACKAGE MAX5978ETJ+ -40NC to +85NC 32 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. VariableSpeed/Bilevel is a trademark of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE0 to 16V, Hot-Swap Controller with 10-Bit Current, Voltage Monitor, and 4 LED Drivers ABSOLUTE MAXIMUM RATINGS IN, SENSE, MON, GATE to AGND ...................... -0.3V to +30V All Other Pins Input/Output Current ..................................20mA LED to AGND .....................................................-0.3V to +16V Continuous Power Dissipation (T = +70NC)* A PG, ON, ALERT, FAULT, SDA, SCL to AGND .......-0.3V to +6V 32-Pin TQFN (derate 34.5mW/NC above +70NC) ..... 2759mW* REG, DREG, IRNG, MODE, PROT, A to AGND ...-0.3V to +4V Junction-to-Ambient Thermal Resistance (B ) (Note 1) .....+29NC/W JA REG to DREG ......................................................-0.3V to +0.3V Operating Temperature Range ........................ -40NC to +85NC HWEN, POL to AGND ............................-0.3V to (V + 0.3V) Junction Temperature .................................................. +150NC REG GATE to MON ........................................................-0.3V to +6V Storage Temperature Range ......................... -65NC to +150NC GND, DGND to AGND ........................................-0.3V to +0.3V Lead Temperature (soldering, 10s) ...............................+300NC SDA, ALERT Current ...................................... -20mA to +50mA Soldering Temperature (reflow) .....................................+260NC LED Current ................................................ -20mA to +100mA GATE, MON, GND Current .............................................750mA *As per JEDEC51 Standard (Multilayer Board). Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four- layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 2.7V to 16V, T = -40NC to +85NC, unless otherwise noted. Typical values are at V = 3.3V and T = +25NC.) (Note 2) IN A IN A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Input Voltage Range V 2.7 16 V IN Hot-Swap Voltage Range 0 16 V Supply Current I 2.5 4 mA IN Internal LDO Output Voltage REG I = 0 to 5mA, V = 2.7V to 16V 2.49 2.53 2.6 V REG IN Undervoltage Lockout UVLO V rising 2.6 V IN Undervoltage-Lockout UVLO 100 mV HYS Hysteresis CURRENT-MONITORING FUNCTION MON, SENSE Input Voltage 0 16 V Range SENSE Input Current V , V = 16V 32 75 FA SENSE MON MON Input Current V , V = 16V 180 280 FA SENSE MON 25mV range 24.34 Current Measurement LSB 50mV range 48.39 FV Voltage 100mV range 96.77 V - V = 5mV -6.57 +6.22 SENSE MON V = 0V MON V - V = 20mV -6.71 +6.82 Current Measurement Error SENSE MON %FS (25mV Range) V - V = 5mV -9.71 +8.92 V = SENSE MON MON 2.5V to 16V V - V = 20mV -10.24 +9.36 SENSE MON V - V = 10mV -4.24 +3.78 SENSE MON V = 0V MON V - V = 40mV -4.53 +5.36 Current Measurement Error SENSE MON %FS (50mV Range) V - V = 10mV -4.50 +4.00 V = SENSE MON MON 2.5V to 16V V - V = 40mV -4.20 +4.50 SENSE MON 2 MAX5978