0V to 16V, Dual Hot-Swap Controller with 10-Bit Current and Voltage Monitor and 4 LED Drivers

The MAX5970 dual hot-swap controller provides complete protection for systems with two supply voltages from 0V to +16V. The MAX5970 includes four programmable LED outputs. The two hot-swap channels can be configured to operate as independent hot-swap controllers, or as a pair operating together so that both channels shut down if either channel experiences a fault.

The MAX5970 provides two programmable levels of overcurrent circuit-breaker protection: a fast-trip threshold for a fast turn-off, and a lower slow-trip threshold for a delayed turn-off. The maximum overcurrent circuit-breaker threshold range is set independently for each channel with a trilevel logic input IRNG, or by programming though the I²C interface.

The MAX5970 is an advanced hot-swap controller that monitors voltage and current with an internal 10-bit ADC which is continuously multiplexed to convert the output voltage and current of both hot-swap channels at 10ksps. Each 10-bit sample is stored in an internal circular buffer so that 50 past samples of each signal can be read back through the I²C interface at any time or after a fault condition.

The device includes five user-programmable digital comparators per hot-swap channel to implement overcurrent warning and two levels of overvoltage/undervoltage detection. When any of the measured values violates the programmable limits, an external active-low ALERT output is asserted. In addition to the active-low ALERT signal, the MAX5970 can be programmed to deassert the power-good signal and/or turn off the external MOSFET.

The MAX5970 features four I/Os that can be independently configured as general-purpose inputs/outputs (GPIOs) or as open-drain LED drivers with programmable blinking. These four I/Os can be configured for any mix of LED driver or GPIO function.

The MAX5970 is available in a 36-pin thin QFN-EP package and operates over the -40°C to +85°C extended temperature range.

Applications

* Blade Servers * Disk Drives/DASD/Storage Systems * Single PCI Express® Hot-Plug Slot * Soft-Switch for ASICs, FPGAs, and Microcontrollers with Independent Core and I/O Voltages

* Two Independent Hot-Swap Controllers Operate from 0V to +16V

* 10-Bit ADC Monitors Voltage and Current of Each Channel

* Circular Buffers Store 5ms of Current and Voltage Measurements

* Two Independent Internal Charge Pumps Generate n-Channel MOSFET Gate Drives

* Internal 500mA Gate Pulldown Current for Fast Shutdown

* VariableSpeed/BiLevel™ Circuit-Breaker Protection

* Independent Precision-Voltage Enable Inputs

* Alert Output Indicates Fault and Warning Conditions

* Independent Power-Good Outputs

* Independent Fault Outputs

* Four Open-Drain Outputs Sink 25mA to Directly Drive LEDs

* Programmable LED Flashing Function

* Autoretry or Latched Fault Management

* 400kHz I²C Interface

* Small 6mm x 6mm, 36-Pin TQFN-EP Package