Overview
The TPS2491DGSRG4, produced by Texas Instruments, is a positive high-voltage power-limiting hot swap controller. This device is designed to safely drive an external N-channel MOSFET switch, ensuring the MOSFET operates within a selected safe operating area (SOA) under various operating conditions. It is particularly useful for applications requiring inrush current limiting, electronic circuit breaker protection, controlled load turn-on, and power feed protection.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Supply Voltage | 9 to 80 | V |
| Package Type | 10-pin VSSOP | |
| Body Size (Nominal) | 3.00 mm × 3.00 mm | |
| Power Limit Setting Input (PROG) | 0.4 to 4 | V |
| Gate Drive Output Voltage | 12 to 16 | V |
| Gate Sourcing Current | 15 to 35 | µA |
| Gate Sinking Current | 1.8 to 2.8 | mA |
| Power Good Output Type | Open-Drain | |
| Timer Upper Threshold Voltage | 3.9 to 4.1 | V |
| Timer Lower Reset Threshold Voltage | 0.96 to 1.04 | V |
Key Features
- Programmable Power Limiting and Current Limiting for Complete Safe Operating Area (SOA) Protection
- Wide Operating Range: 9 V to 80 V
- Automatic Retry (TPS2491) and Latched Operation (TPS2490)
- High-Side Drive for Low-RDS(on) External N-channel MOSFET
- Programmable Fault Timer to Protect the MOSFET and Eliminate Nuisance Shutdowns
- Power Good Open-Drain Output for Downstream DC/DC Coordination
- Enable Can Be Used as a Programmable Undervoltage Lockout or Logic Control
- Small, Space-Saving 10-pin VSSOP Package
- Calculator Tool Available (TPS2490/91 Design-in Calculator, SLVC033)
Applications
- Server Backplanes
- Storage Area Networks (SAN)
- Medical Systems
- Plug-In Modules
- Base Stations
Q & A
- What is the operating voltage range of the TPS2491DGSRG4?
The operating voltage range is from 9 V to 80 V.
- What type of package does the TPS2491DGSRG4 come in?
The TPS2491DGSRG4 comes in a 10-pin VSSOP package.
- What is the purpose of the PROG pin on the TPS2491DGSRG4?
The PROG pin is used to set the power limit used by the constant power engine, with a voltage range of 0.4 to 4 V.
- How does the TPS2491DGSRG4 protect the external MOSFET?
The device protects the MOSFET through programmable power limiting and current limiting to maintain operation within the Safe Operating Area (SOA).
- What is the function of the TIMER pin on the TPS2491DGSRG4?
The TIMER pin controls the fault-time for both versions and the restart interval for the TPS2491, using an integrating capacitor.
- What is the difference between TPS2490 and TPS2491?
The TPS2490 has a latched operation, while the TPS2491 has an automatic retry feature.
- How does the Power Good (PG) output work?
The PG output is an open-drain output that reports the power status, going high after the VDS of Q1 has fallen below 1.25 V and a 9-ms deglitch time has elapsed.
- Can the TPS2491DGSRG4 be used in high-temperature environments?
The device is designed to operate within a wide range of temperatures, but specific temperature limits should be checked in the datasheet.
- What tools are available to support the design of the TPS2491DGSRG4?
A design-in calculator tool (SLVC033) is available to support the design process.
- How does the enable pin function on the TPS2491DGSRG4?
The enable pin can be used as a programmable undervoltage lockout or logic control, shutting down the device when the system input voltage falls below the desired operating range.
