1 Features

• D-CAP2™ Mode Enables Fast Transient Response
• Low Output Ripple and Allows Ceramic Output Capacitor
• Wide V_IN Input Voltage Range: 4.5 V to 18 V
• Output Voltage Range: 0.76 V to 7 V
• Highly-Efficient Integrated FETs Optimized
  for Lower Duty Cycle Applications
  • 155 mΩ (High-Side) and 108 mΩ (Low-Side)
• High Efficiency, Less Than 10 μA at Shutdown
• High Initial Bandgap Reference Accuracy
• Adjustable Soft-Start
• Prebiased Soft-Start
• 700-kHz Switching Frequency (f_SW)
• Cycle-By-Cycle Overcurrent Limit

2 Applications

• Wide Range of Applications for Low-Voltage System
  • Digital TV Power Supply
  • High-Definition Blu-ray Disc™ Players
  • Networking Home Terminals
  • Digital Set Top Boxes (STB)

3 Description

The TPS54227 device is an adaptive ON-time D-CAP2 mode synchronous buck converter. The TPS54227 enables system designers to complete the bus regulators for a suite of various end equipment with a cost-effective, low component count, low standby current solution. The main control loop for the TPS54227 uses the D-CAP2 mode control which provides a fast transient response with no external compensation components. The TPS54227 also has a proprietary circuit that enables the device to adopt to both low equivalent series resistance (ESR) output capacitors, such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors. The device operates from 4.5-V to 18-V VIN input. The output voltage can be programmed between 0.76 V and 7 V. The device also features an adjustable soft-start time. The TPS54227 is available in the 8-pin HSOP package and 10-pin VSON, and is designed to operate from –40°C to 85°C.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

TPS54227 Transient Response