TPS51221 - 固定频率 99% 占空比峰值电流模式笔记本系统功率双路控制器

TPS51221是TI德州仪器公司的一款控制器（外部开关）产品，TPS51221是固定频率 99% 占空比峰值电流模式笔记本系统功率双路控制器，本站介绍了TPS51221的封装应用图解、特点和优点、功能等，并给出了与TPS51221相关的TI元器件型号供参考。

TPS51221 - 固定频率 99% 占空比峰值电流模式笔记本系统功率双路控制器 - 控制器（外部开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The TPS51221 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 TPS51221 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. Peak current mode supports stability operation with lower ESR capacitor and output accuracy. The high duty (99%) operation and 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 1MHz by a resistor, and each channel runs 180° out of phase. The TPS51221 can also synchronize to the external clock, and the interleaving ratio can be adjusted by its duty. The TPS51221 is available in the 32-pin 5×5 QFN package and is specified from -40°C to 85°C.

产品特性

Input Voltage Range: 4.5 V to 28 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
Powergood Output for each channel
OCL/OVP/UVP/UVLO protections
Current Monitor Output for CH1
Thermal Shutdown (Non-latch)
Output Discharge Function (Disable option)
Integrated Boot Strap MOSFET Switch
QFN32 (RTV)
APPLICATIONS
- Notebook Computer System and I/O Bus
- Point of load in LCD TV, MFP

Out-Of-Audio, PowerPAD are trademarks of Texas Instruments.

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