Overview
The TPS2399DGKR is a hot swap power manager integrated circuit designed by Texas Instruments. It is optimized for use in nominal −48-V systems, particularly in redundant-supply configurations. This device provides advanced features for managing power distribution, protecting against faults, and ensuring smooth operation during supply transitions.
The TPS2399DGKR is part of the TPS2398 and TPS2399 family, with the key difference being that the TPS2399 periodically retries the load in the event of a fault, whereas the TPS2398 latches off in response to current faults.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Input voltage range, all pins except RTN, EN, PG | −0.3 V | 15 V | V | |
| Input voltage range, RTN | −0.3 V | 100 V | V | |
| Input voltage range, EN | −0.3 V | 100 V | V | |
| Output voltage range, PG | −0.3 V | 100 V | V | |
| Continuous output current, PG | 10 mA | mA | ||
| Operating junction temperature range, TJ | −55°C | 125°C | °C | |
| Storage temperature range, Tstg | −65°C | 150°C | °C | |
| Transient rating to −VIN | −100 V | V | ||
| Package type | MSOP-8 |
Key Features
- Wide Input Supply Range: −36 V to −80 V with transient rating to −100 V.
- Programmable Current Limit: Allows for setting the maximum current to the load.
- Programmable Current Slew Rate: Controlled by an external capacitor connected to the IRAMP pin.
- Fault Timer: Eliminates nuisance trips and provides a user-programmable fault timeout period.
- Open-Drain Power Good Output (PG): Indicates the load power good condition.
- Improved Transient Response: Rapid protection from short circuits and tolerance for large transients during supply switchover.
- Enable Input (EN): Allows for turning on/off power to the load.
- Gate Drive for External N-Channel FET: Controls the pass FET to manage the load current.
- Current Sense Input (ISENS): Monitors the current magnitude and provides feedback for current regulation.
Applications
- −48-V Distributed Power Systems: Ideal for managing power in high-voltage distributed systems.
- Redundant Negative Voltage Supplies: Ensures reliable operation in redundant supply configurations.
- Central Office Switching: Suitable for use in central office switching equipment where hot swap capabilities are crucial.
Q & A
- What is the primary function of the TPS2399DGKR?
The TPS2399DGKR is a hot swap power manager designed to manage power distribution, protect against faults, and ensure smooth operation during supply transitions in nominal −48-V systems.
- What is the difference between the TPS2398 and TPS2399?
The TPS2398 latches off in response to current faults, while the TPS2399 periodically retries the load in the event of a fault.
- What is the input voltage range for the TPS2399DGKR?
The input voltage range is −36 V to −80 V, with a transient rating to −100 V.
- How is the current slew rate programmed in the TPS2399DGKR?
The current slew rate is programmed using an external capacitor connected to the IRAMP pin.
- What is the purpose of the fault timer in the TPS2399DGKR?
The fault timer eliminates nuisance trips and provides a user-programmable fault timeout period.
- What is the function of the PG (Power Good) output?
The PG output is an open-drain, active-low indication of a load power good condition.
- How does the TPS2399DGKR handle transient responses during supply switchover?
The device provides rapid circuit-breaker protection for load faults and minimizes interruption of power flow during supply switching events.
- What package type is the TPS2399DGKR available in?
The TPS2399DGKR is available in an 8-pin MSOP package.
- What are the typical applications of the TPS2399DGKR?
Typical applications include −48-V distributed power systems, redundant negative voltage supplies, and central office switching equipment.
- How does the TPS2399DGKR protect against short circuits?
The device features a fast-acting overload comparator that rapidly pulls down the GATE output to terminate short-circuit conditions.
