Overview
The TPS2551-Q1, manufactured by Texas Instruments, is a current-limited power-distribution switch designed for applications where heavy capacitive loads and short circuits are likely to occur. This device incorporates a 100-mΩ, N-channel MOSFET in a single package, making it suitable for managing power distribution in various electronic systems. The current-limit threshold is user-adjustable between 100 mA and 1.1 A using an external resistor, allowing for flexible configuration based on the application requirements. The switch also includes features such as overtemperature protection, reverse-voltage protection, and an internal charge pump and gate drive circuitry to ensure reliable operation.
Key Specifications
| Parameter | Description |
|---|---|
| Current Limit Threshold | Adjustable between 100 mA and 1.1 A via external resistor |
| Input Voltage Range | 2.5 V to 6.5 V |
| MOSFET Resistance | 100 mΩ (N-channel) |
| Package Type | SOT-23 (6-pin) |
| Package Size | 2.90 mm × 1.60 mm |
| Enable Input | VEN = 5.0 V (typical) |
| FAULT Output | Open-drain, active-low during fault conditions |
| Overtemperature Protection | Immediate FAULT signal assertion |
| Reverse-Voltage Protection | Internal reverse-voltage detection comparator |
Key Features
- Adjustable current-limit threshold between 100 mA and 1.1 A using an external resistor.
- Internal charge pump and gate drive circuitry for driving the N-channel MOSFET.
- Overtemperature protection with immediate FAULT signal assertion.
- Reverse-voltage protection with an internal comparator.
- FAULT open-drain output asserted during overcurrent, overtemperature, or reverse-voltage conditions.
- Internal deglitch circuitry to prevent false FAULT reporting.
- Undervoltage lockout (UVLO) circuit to disable the power switch until the input voltage reaches the UVLO turn-on threshold.
Applications
The TPS2551-Q1 is suitable for various applications requiring continuous load current and protection against heavy capacitive loads and short circuits. These include:
- Power distribution in automotive systems.
- Protection of devices in industrial control systems.
- Management of power in consumer electronics.
- Implementation in two-level current-limit circuits for different system conditions.
Q & A
- What is the primary function of the TPS2551-Q1?
The TPS2551-Q1 is a current-limited power-distribution switch designed to manage power distribution and protect against heavy capacitive loads and short circuits. - How is the current-limit threshold adjusted?
The current-limit threshold is adjustable between 100 mA and 1.1 A using an external resistor. - What is the input voltage range for the TPS2551-Q1?
The input voltage range is from 2.5 V to 6.5 V. - What type of MOSFET is used in the TPS2551-Q1?
The device uses a 100-mΩ, N-channel MOSFET. - What is the purpose of the FAULT output?
The FAULT output is an open-drain signal that is asserted (active-low) during overcurrent, overtemperature, or reverse-voltage conditions. - Does the TPS2551-Q1 have overtemperature protection?
Yes, the device includes overtemperature protection that immediately asserts the FAULT signal. - How does the TPS2551-Q1 handle reverse-voltage conditions?
The device has an internal reverse-voltage detection comparator that disables the power switch and asserts the FAULT output. - What is the role of the internal charge pump and gate drive circuitry?
The internal charge pump and gate drive circuitry are used to drive the N-channel MOSFET, ensuring reliable operation. - Does the TPS2551-Q1 have undervoltage lockout (UVLO) protection?
Yes, the device includes a UVLO circuit that disables the power switch until the input voltage reaches the UVLO turn-on threshold. - What is the package type and size of the TPS2551-Q1?
The package type is SOT-23 (6-pin), and the package size is 2.90 mm × 1.60 mm.
