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Power Protection and Control 
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MAX5977B
1V to 16V, Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output
1V to 16V, Hot-Swap Controller with Precision Current-Sense Output
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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 | Periodic Retry |
| Positive/Negative Rail | Positive |
| Features | On-Board Charge Pumps to Drive External VariableSpeed/BiLevel Current Limit |
| Package/Pins | TQFN/20 |
| Budgetary Price (See Notes) | 2.32 |
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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 | Periodic Retry |
| Positive/Negative Rail | Positive |
| Features | On-Board Charge Pumps to Drive External VariableSpeed/BiLevel Current Limit |
| Package/Pins | TQFN/20 |
| Budgetary Price (See Notes) | 2.32 |
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.
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.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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