Overview
The TPS54383, produced by Texas Instruments, is a dual-output, non-synchronous step-down (buck) converter. This device is designed to support a wide range of applications requiring efficient and reliable power conversion. The TPS54383 integrates multiple key components, including an internally-compensated error amplifier, current mode pulse width modulator (PWM), switch MOSFET, internal bootstrap switch for high-side gate drive, and comprehensive fault protection circuitry. This integration minimizes the need for external components, simplifying the design process and reducing the overall footprint of the power supply system.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 4.5 | 28 | V | |
| Output Voltage Range | 0.8 | 90% of Input | V | |
| Switching Frequency (TPS54383) | 255 | 300 | 375 | kHz |
| Switching Frequency (TPS54386) | 510 | 600 | 750 | kHz |
| Output Current (per Channel) | 3 | A | ||
| Internal High-Side MOSFET Resistance | 85 | 165 | mΩ | |
| Soft-Start Time | 1.5 | 2.1 | 2.7 | ms |
| Thermal Shutdown Temperature | 148 | °C | ||
| Package Type | 14-Pin PowerPAD™ HTSSOP |
Key Features
- Dual PWM outputs 180° out-of-phase for reduced input ripple and improved efficiency.
- Internally-compensated error amplifier and current mode PWM controller.
- Internal bootstrap switch for high-side gate drive.
- Comprehensive fault protection including cycle-by-cycle current limit, output undervoltage detection, hiccup timeout, and thermal shutdown.
- Three selectable levels of overcurrent protection for Channel 2.
- 0.8-V 1.5% voltage reference.
- 2.1-ms internal soft-start time.
- Ratiometric or sequential startup modes selectable by a single pin.
- Pulse-by-pulse overcurrent protection and thermal shutdown at +148°C.
Applications
- Set Top Box
- Digital TV
- Power for DSP (Digital Signal Processors)
- Consumer Electronics
Q & A
- What is the input voltage range of the TPS54383?
The input voltage range is from 4.5 V to 28 V.
- What are the switching frequencies available for the TPS54383 and TPS54386?
The TPS54383 operates at 300 kHz, while the TPS54386 operates at 600 kHz.
- What is the maximum output current per channel?
The maximum output current per channel is 3 A.
- How does the overcurrent protection work on the TPS54383?
The device features cycle-by-cycle current limit with three selectable levels of overcurrent protection for Channel 2 and a fixed current limit for Channel 1.
- What are the startup modes available for the TPS54383?
The device supports ratiometric or sequential startup modes, selectable by a single pin.
- What is the thermal shutdown temperature of the TPS54383?
The thermal shutdown temperature is +148°C.
- What type of package does the TPS54383 come in?
The TPS54383 comes in a 14-Pin PowerPAD™ HTSSOP package.
- Does the TPS54383 have internal compensation?
- What is the soft-start time of the TPS54383?
The soft-start time is approximately 2.1 ms.
- Can the outputs be powered from different sources?
