Overview
The TPS2561DRCT is a dual-channel, precision adjustable current-limited power-distribution switch produced by Texas Instruments. This device is designed for applications where short circuits or heavy capacitive loads are encountered. It utilizes N-channel MOSFETs and incorporates an internal charge pump and gate drive circuitry to drive the MOSFETs efficiently. The TPS2561DRCT operates from input voltages as low as 2.5 V and up to 6.5 V, making it versatile for various power distribution needs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 2.5 - 6.5 | V |
| Current Limit Range | 250 mA - 2.8 A (typ) | A |
| Current-Limit Accuracy at 2.8 A | ± 7.5% | % |
| Overcurrent Response Time | 3.5 µs (typ) | µs |
| Standby Supply Current | 2 µA (max) | µA |
| MOSFET On-Resistance | 44 mΩ (typ) | mΩ |
| System-Level ESD Capability | 15 kV / 8 kV | kV |
| Certifications | UL Listed, CB & Nemko Certified |
Key Features
- Two separate current limiting channels
- Meets USB current-limiting requirements
- Adjustable current limit via an external resistor (RILIM)
- Internal charge pump and gate drive circuitry for efficient MOSFET operation
- Fast overcurrent response time of 3.5 µs (typ)
- Built-in soft-start and controlled rise and fall times to minimize current surges
- FAULTx logic output for overcurrent and overtemperature conditions
- Undervoltage lockout (UVLO) and thermal protection
- Low standby supply current of less than 2 µA
Applications
- USB Ports and Hubs
- Digital TV and Set-Top Boxes
- VOIP Phones
- Other applications requiring precision current limiting and protection against short circuits or heavy capacitive loads
Q & A
- What is the input voltage range of the TPS2561DRCT?
The input voltage range is from 2.5 V to 6.5 V.
- How is the current limit set on the TPS2561DRCT?
The current limit is set via an external resistor (RILIM) connected to the ILIM pin.
- What is the typical overcurrent response time of the TPS2561DRCT?
The typical overcurrent response time is 3.5 µs.
- Does the TPS2561DRCT have built-in thermal protection?
Yes, it has thermal protection with two independent thermal sensing circuits.
- What certifications does the TPS2561DRCT hold?
The device is UL Listed and certified by CB and Nemko.
- How does the FAULTx signal work on the TPS2561DRCT?
The FAULTx signal is an open-drain output that asserts low during overcurrent or overtemperature conditions and remains asserted until the fault is removed.
- What is the purpose of the internal charge pump in the TPS2561DRCT?
The internal charge pump supplies power to the driver circuit and provides the necessary voltage to pull the gate of the MOSFET above the source.
- Can the TPS2561DRCT be used in USB applications?
Yes, it meets USB current-limiting requirements and is suitable for USB ports and hubs.
- How does the undervoltage lockout (UVLO) work on the TPS2561DRCT?
The UVLO disables the power switch until the input voltage reaches the UVLO turn-on threshold, preventing unwanted on/off cycling due to input voltage droop.
- What is the standby supply current of the TPS2561DRCT?
The standby supply current is less than 2 µA.
