MAX5977A

PRODUCTION

1V to 16V, Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output

1V to 16V, Hot-Swap Controller with Precision Current-Sense Output

Data Sheet (Rev. 3) Product Selection Table
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Overview

  • 1% Accurate Current-Sense Amplifier Output
  • Hot-Swap Monitors Operation from 1V to 16V
  • Integrated Charge Pump Fully Enhances the External n-Channel FET (VGATE = VIN + 5V)
  • VariableSpeed/BiLevel™ Fault Protection Provides Electronic Circuit-Breaker Function
  • Output Latched Off After Fault Condition (MAX5977A)
  • Autoretry After Fault Condition (MAX5977B)
  • Power-Good Indicator
  • Calibration Mode
  • Small, 20-Pin, 4mm x 4mm, TQFN-EP Package

The MAX5977A/MAX5977B hot-swap controllers provide complete protection for systems with a 1V to 16V single-supply voltage.

During the initial insertion, the hot-swap controllers limit the inrush current from damaging the board or from shorting out the backplane. When the input voltage is above the undervoltage threshold and below the overvoltage threshold, a 5µA current source powered from the internal 5V charge pump drives the gate of an external n-channel MOSFET providing a slow turn-on response. An internal current-sense amplifier in the IC monitors the current across an external shunt resistor providing current sensing for wide input-sense voltage range. The devices provide two levels of overcurrent circuit-breaker protections: a fast-trip threshold for a fast turn-off and a lower slow-trip threshold for a delayed turn-off.

Exceeding either of the overcurrent circuit-breaker thresholds will force the device into fault mode where the external n-channel MOSFET is disabled. The MAX5977 is available in two versions which provide a latched off (MAX5977A) or autoretry (MAX5977B) output when the device is in fault mode.

A calibration mode allows further calibration of the integrated transconductance amplifier for production testing of the final design. The devices are offered in a 20-pin, 4mm x 4mm, TQFN-EP package and are fully specified from -40°C to +85°C.

Applications

  • General Hot-Swap
  • Network Switches and Routers
  • Servers
  • Storage Systems
MAX5977A
1V to 16V, Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output
MAX5977A, MAX5977B: Typical Operating Circuit
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Documentation

Data Sheet 1

Application Note 1

Design Note 1

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Evaluation Kits

MAX5977AEVKIT

Evaluation Kit for the MAX5977A and MAX5977B

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Features and Benefits

  • 1V to 16V Input Range
  • Demonstrates Latched-Fault Output
  • Configurable Input Undervoltage (9V) and Overvoltage (15V) Thresholds
  • Output Current Up to 40A
  • Configurable Slow and Fast Current-Limit Thresholds
  • Precision Current Monitoring
  • Calibration Mode
  • Selectable Digital Voltage Supply (VIO)
  • Active-Low FAULT and Power-Good LED Indicators
  • Buffered Current-Sense Amplifier Output Drives External Circuitry
  • Evaluates MAX5977A Latched-Off Version
  • Evaluates MAX5977B Autoretry Version After IC Replacement
  • Surface-Mount Components
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX5977A EV kit is a hot-swap controller circuit board providing a controlled turn-on for high-power, high-capacitance loads, thus preventing glitches on the power-supply rail. The circuit uses a latching MAX5977A hot-swap controller IC in a 20-pin TQFN surface-mount package with an exposed pad. The EV kit operates from a 1V to 16V input source range connected at the VIN and GND connectors.

The IC controls two n-channel MOSFETs that deliver up to 40A of output current. The EV kit circuit ensures that the output voltage is stable and within the undervoltage (UV) and overvoltage (OV) thresholds. The circuit continually monitors load current to ensure that it does not exceed the circuit programmable fast and slow current-limit thresholds. The EV kit circuit provides a buffered output of the IC's current-sense amplifier and includes a precision current source providing a 2.5V output when enabling the IC's calibration-mode function.

The EV kit can also be used to evaluate the MAX5977B autoretry hot-swap controller after IC replacement of U1.

Applications

  • General Hot-Swap
  • Network Switches and Routers
  • Servers
  • Storage Systems
MAX5977AEVKIT
Evaluation Kit for the MAX5977A and MAX5977B

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