TPS54428DRCR

The TPS54428 is an adaptive on-time D-CAP2™ mode synchronous buck converter. It helps system designers complete power bus regulator sets for various end equipment through a cost-effective, low component count, low standby current solution. The main control loop employs D-CAP2™ mode control, achieving fast transient response without external compensation components. Adaptive on-time control supports seamless transition between PWM mode under heavy load conditions and Eco-mode™ operation under light load. Eco-mode™ enables the TPS54428 to maintain high efficiency under light load conditions. A proprietary circuit allows the device to use low ESR output capacitors such as polymer organic semiconductor capacitors (POSCAP) or polymer capacitors (SP-CAP), as well as ultra-low ESR ceramic capacitors. The device operates with an input voltage between 4.5V and 18V VIN, with an output voltage adjustable from 0.76V to 7.0V. The device also features an adjustable soft-start time. Available in an 8-pin DDA package and a 10-pin DRC package, designed to operate over an ambient temperature range of -40°C to 85°C.

Applications

• Wide application in low-voltage systems
• Digital TV power supplies
• High-definition 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 7.0V
• High-efficiency integrated FET
• Optimized for low duty cycle applications
• 70mΩ (high-side) and 53mΩ (low-side)
• Shutdown quiescent current under 10μA for high efficiency
• High initial bandgap reference accuracy
• Adjustable soft-start
• Pre-bias soft-start
• 650kHz switching frequency (fSW)
• Cycle-by-cycle overcurrent limiting
• Auto-skip Eco-mode™ for high efficiency at light load