TPS51221集成电路（IC）的线性稳压器控制器规格书PDF中文资料

TPS51221属于集成电路（IC）的线性稳压器控制器。由德州仪器制造生产的TPS51221稳压器 - 线性 + 开关此产品族中的产品用于构建执行 DC-DC 转换或电压调节功能的电路，采用的是开关模式和线性稳压器功能的组合。虽然具体的拓扑各不相同，但此类产品的主要目的是将开关模式技术的效率优势与线性稳压技术的低噪声特性结合在一起。

1FEATURES

2· 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

DESCRIPTION

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.