“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 5×5 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