TPS54628DDA

The TPS54628 is an adaptive on-time D-CAP2 mode synchronous buck converter. It helps system designers implement a complete power bus regulator set for various end equipment using a cost-effective, low component count, low standby current solution. The main control loop uses D-CAP2 mode control, which provides fast transient response without external compensation components. Adaptive on-time control enables seamless transitions between PWM mode under heavy load conditions and Eco-mode operation under light load. Eco-mode allows the TPS54628 to maintain high efficiency at light loads. Proprietary circuitry also enables the device to support low ESR output capacitors such as polymer organic semiconductor capacitors (POSCAP) or SP-CAP, as well as ultra-low ESR ceramic capacitors. The operating input voltage ranges from 4.5V to 18V VIN. The output voltage is adjustable between 0.76V and 5.5V. An adjustable soft-start time is featured. The device is available in an 8-pin DDA package and is designed for operation over a -40°C to 85°C temperature range.

Applications

• Wide application in low-voltage systems
• Digital TV power supplies
• HD Blu-ray Disc players
• Network home terminal equipment
• Digital set-top boxes (STB)

Key features

• D-CAP2 mode for fast transient response
• Low output ripple, compatible with ceramic output capacitors
• Wide input voltage range: 4.5V to 18V
• Output voltage range: 0.76V to 5.5V
• High-efficiency integrated FET
• Optimized for low duty cycle applications
• -36mΩ (high-side) and 28mΩ (low-side)
• High efficiency in shutdown, quiescent current below 10μA
• High accuracy initial bandgap reference
• Adjustable soft-start
• Pre-bias soft-start
• 650kHz switching frequency (fSW)
• Cycle-by-cycle overcurrent limiting
• Automatic skip Eco-mode for high efficiency at light load