"The TPS51220 is a dual synchronous buck regulator controller with 2 LDOs. It is optimized for 5-V/3.3-V system controller, enabling designers to cost effectively complete 2-cell to 4-cell notebook system power supply. The TPS51220 supports high efficiency, fast transient response and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 V to 28 V, and output voltages from 1 V to 12 V. Two types of control schemes can be chosen depending on the application. Peak current mode supports stability operation with lower ESR capacitor and output accuracy. The D-CAP mode supports fast transient response. The high duty (99%) operation and the wide input/output voltage range supports flexible design for small mobile PCs and a wide variety of other applications. The fixed frequency can be adjusted from 200 kHz to 1 MHz by a resistor, and each channel runs 180° out of phase. The TPS51220 can also synchronize to the external clock, and the interleaving ratio can be adjusted by its duty. The TPS51220 is available in the 32 pin 5x5 QFN package and is specified from –40°C to 85°C.

Features

• Input Voltage Range: 4.5 V to 28 V
• Powergood Output for Each Channel
• Output Voltage Range: 1 V to 12 V
• OCL/OVP/UVP/UVLO Protections (OVP Disable Option)
• Selectable Light Load Operation (Continuous / Auto Skip / Out-Of-Audio™ Skip)
• Thermal Shutdown (Non-Latch)
• Programmable Droop Compensation • Output Discharge Function (Disable Option)
• Voltage Servo Adjustable Soft Start • Integrated Boot Strap MOSFET Switch
• 200 kHz to 1 MHz Fixed Frequency PWM • QFN-32 (RHB)
• Selectable Current/ D-CAP™ Mode Architecture
• 180° Phase Shift Between Channels
• Resistor or Inductor DCR Current Sensing

Applications:

• Notebook Computer System and I/O Bus
• Point of Load in LCD TV, MFP