Overview
The TPS2559-Q1, produced by Texas Instruments, is a precision adjustable current-limited power-distribution switch. This device is designed for applications where low resistance and precise current limiting are essential, such as in automotive USB ports and internal load switches. The TPS2559-Q1 uses N-channel MOSFETs and incorporates an internal charge pump and gate drive circuitry to manage the power switch. It operates within a voltage range of 2.5 to 6.5 V and can handle up to 5.5 A of continuous load current. The current limit is adjustable via an external resistor, and the device includes features such as built-in soft-start, reverse current blocking, and thermal shutdown to ensure safe and reliable operation.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Operating Voltage Range | 2.5 | - | 6.5 | V |
| Continuous Load Current | - | - | 5.5 | A |
| Adjustable Current Limit (I(LIMIT)) | 1.2 | - | 4.7 | A |
| Input-Output Resistance (RDS(on)) | 13 | 16 | - | mΩ |
| Short Circuit Shutoff Time | - | 3.5 | - | µs |
| Standby Supply Current | - | - | 2 | µA |
| Thermal Shutdown Threshold | 155 | - | - | °C |
| ESD Classification | H2 (HBM), C5 (CDM) | - | - | - |
| Package Type | - | - | - | 10-Pin SON (3-mm × 3-mm) |
Key Features
- Precision Adjustable Current Limit: Adjustable current limit set by a single external resistor (R(ILIM)) from 1.2 A to 4.7 A.
- Low Resistance: High-side MOSFET with an input-output resistance (RDS(on)) of 13 mΩ typical.
- Thermal Protection: Dual thermal sensing circuits to prevent overheating, with thermal shutdown thresholds at 135°C and 155°C.
- Soft-Start and Reverse Current Blocking: Built-in soft-start functionality and reverse current blocking when disabled.
- ESD Protection: System-level ESD capability up to 8 kV / 15 kV.
- FAULT Signal: Active-low open-drain output asserted during overcurrent or overtemperature conditions.
- Low Standby Current: Maximum standby supply current of 2 µA.
- Automotive Qualification: Qualified for automotive applications according to AEC-Q100 standards.
Applications
- Automotive USB Ports/Hubs: Ideal for managing power distribution in automotive USB ports and hubs.
- Automotive Internal Load Switches: Suitable for internal load switching in automotive systems where precise current limiting is required.
Q & A
- What is the operating voltage range of the TPS2559-Q1?
The TPS2559-Q1 operates within a voltage range of 2.5 V to 6.5 V.
- How is the current limit set on the TPS2559-Q1?
The current limit is set using an external resistor (R(ILIM)) connected to the ILIM pin and ground.
- What is the maximum continuous load current the TPS2559-Q1 can handle?
The TPS2559-Q1 can handle up to 5.5 A of continuous load current.
- Does the TPS2559-Q1 have built-in thermal protection?
Yes, the TPS2559-Q1 has dual thermal sensing circuits that disable the power switch if the temperature exceeds 135°C or 155°C.
- What is the purpose of the FAULT signal on the TPS2559-Q1?
The FAULT signal is an active-low open-drain output that asserts during overcurrent or overtemperature conditions.
- Is the TPS2559-Q1 qualified for automotive applications?
Yes, the TPS2559-Q1 is qualified for automotive applications according to AEC-Q100 standards.
- What is the typical input-output resistance (RDS(on)) of the TPS2559-Q1?
The typical input-output resistance (RDS(on)) is 16 mΩ.
- Does the TPS2559-Q1 have ESD protection?
Yes, the TPS2559-Q1 has system-level ESD capability up to 8 kV / 15 kV.
- What is the standby supply current of the TPS2559-Q1 when disabled?
The maximum standby supply current is 2 µA when the device is disabled.
- What package type is the TPS2559-Q1 available in?
The TPS2559-Q1 is available in a 10-Pin SON (3-mm × 3-mm) package.
