TPS51222RTVR

固定频率， 99 ％占空比峰值电流模式笔记本系统功率控制器 Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller

DESCRIPON

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