Overview
The TPS54308DDCR from Texas Instruments is a high-performance, synchronous step-down converter designed to operate within a wide input voltage range of 4.5 V to 28 V. This device is capable of delivering a continuous output current of up to 3 A, making it suitable for a variety of power supply applications. The TPS54308DDCR integrates two n-channel MOSFETs, an internal loop compensation network, and a 5-ms internal soft start, which reduces the external component count and simplifies the control loop design. It operates in force continuous conduction mode (FCCM) during light load conditions, maintaining a constant switching frequency of 350 kHz. This feature is particularly beneficial for applications requiring tight control over the switching frequency and output voltage ripple.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 - 28 | V |
| Output Current | Up to 3 | A |
| Switching Frequency | 350 | kHz |
| High-Side MOSFET Resistance | 85 mΩ | |
| Low-Side MOSFET Resistance | 40 mΩ | |
| Quiescent Current | 300 µA (typical) | |
| Shutdown Current | 2 µA (typical) | |
| Soft Start Time | 5 ms | |
| Package Type | SOT-23-THN (6 pins) | |
| Thermal Shutdown | 165 °C (rising) |
Key Features
- Integrated 85-mΩ and 40-mΩ MOSFETs for high-efficiency power supply designs.
- Low 2-µA shutdown and 300-µA quiescent current.
- Internal 5-ms soft start to minimize inrush currents.
- Fixed 350-kHz switching frequency with peak current mode control.
- Internal loop compensation to reduce external component count.
- Overcurrent protection with hiccup mode for both high-side and low-side MOSFETs.
- Overvoltage protection to prevent excessive output voltage transients.
- Thermal shutdown to protect against overheating.
- Force continuous conduction mode (FCCM) during light load conditions to maintain constant switching frequency.
Applications
The TPS54308DDCR is suitable for a wide range of applications, including:
- Industrial power supplies requiring high efficiency and reliability.
- Automotive systems where a wide input voltage range is necessary.
- Consumer electronics needing compact and efficient power conversion solutions.
- Audio equipment where maintaining a constant switching frequency is crucial to avoid noise.
- General-purpose DC-DC conversion in various electronic devices.
Q & A
- What is the input voltage range of the TPS54308DDCR?
The input voltage range is 4.5 V to 28 V.
- What is the maximum output current of the TPS54308DDCR?
The maximum output current is up to 3 A.
- What is the switching frequency of the TPS54308DDCR?
The switching frequency is fixed at 350 kHz.
- What type of MOSFETs are integrated into the TPS54308DDCR?
The device integrates two n-channel MOSFETs with resistances of 85 mΩ and 40 mΩ for the high-side and low-side, respectively.
- What is the quiescent current of the TPS54308DDCR when not switching?
The quiescent current is 300 µA (typical) when the device is not switching.
- What is the shutdown current of the TPS54308DDCR?
The shutdown current is 2 µA (typical).
- Does the TPS54308DDCR have overcurrent protection?
- What is the thermal shutdown temperature of the TPS54308DDCR?
The thermal shutdown temperature is 165 °C (rising).
- What package type is the TPS54308DDCR available in?
The device is available in the SOT-23-THN (6 pins) package.
- Does the TPS54308DDCR operate in continuous conduction mode during light load conditions?
