DESCRIPTION
●The TPS51222 is a dual synchronous buck regulator controller with two 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 TPS51222 supports high efficiency, fast transient response, and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 V to 32 V, and output voltages from 1 V to 12 V. Peak current mode supports stability operation with lower ESR capacitor and output accuracy. The high duty cycle (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 TPS51222 can also synchronize to the external clock, and the interleaving ratio can be adjusted by its duty. The TPS51222 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 32 V
●• Output Voltage Range: 1 V to 12 V
●• Selectable Light Load Operation (Continuous / Auto Skip / Out-Of-Audio™ Skip)
●• Programmable Droop Compensation
●• Voltage Servo Adjustable Soft Start
●• 200-kHz to 1-MHz Fixed-Frequency PWM
●• Current Mode Architecture
●• 180° Phase Shift Between Channels
●• Resistor or Inductor DCR Current Sensing
●• Current Monitor Output for Each Channel
●• Adaptive Zero Crossing Circuit
●• Powergood Output for Each Channel
●• OCL/OVP/UVP/UVLO Protections
●• Thermal Shutdown (Non-Latch)
●• Output Discharge Function
●• Integrated Boot Strap MOSFET Switch
●• QFN-32 (RTV) Package
●APPLICATIONS
●• Notebook Computer System and I/O Bus
●• Point of Load in LCD TV, MFP
