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

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

Product Details

Key Features

Applications/Uses

Parametric specs for Hot Swap Controllers
VIN (V) (min) 1
VIN (V) (max) 16
# Channels 1
Circuit Breaker/ Current Limit Circuit Breaker
Circuit Breaker/Current Limit Threshold (mV) Adjustable
Fault Condition Control Latched Off
Positive/Negative Rail Positive
Features On-Board Charge Pumps to Drive External
VariableSpeed/BiLevel Current Limit
Package/Pins TQFN/20
Budgetary
Price (See Notes)
1.6
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Simplified Block Diagram

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Parameters

Parametric specs for Hot Swap Controllers
VIN (V) (min) 1
VIN (V) (max) 16
# Channels 1
Circuit Breaker/ Current Limit Circuit Breaker
Circuit Breaker/Current Limit Threshold (mV) Adjustable
Fault Condition Control Latched Off
Positive/Negative Rail Positive
Features On-Board Charge Pumps to Drive External
VariableSpeed/BiLevel Current Limit
Package/Pins TQFN/20
Budgetary
Price (See Notes)
1.6

Key Features

  • 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

Applications/Uses

  • General Hot-Swap
  • Network Switches and Routers
  • Servers
  • Storage Systems

Description

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.

Simplified Block Diagram

MAX5977A, MAX5977B: Typical Operating Circuit MAX5977A, MAX5977B: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .