TPS51221中文資料適用于筆記本電腦電源的 3V 至 28V 同步雙路輸出峰值電流模式降壓控制器數(shù)據(jù)手冊TI規(guī)格書

描述 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.

特性 Features

? Input Voltage Range: 4.5 V to 28 V
? Selectable Light Load Operation (Continuous / Auto Skip / Out-Of-Audio? Skip)
? Voltage Servo Adjustable Soft Start
? Current Mode Architecture
? Resistor or Inductor DCR Current Sensing
? OCL/OVP/UVP/UVLO protections
? Thermal Shutdown (Non-latch)
? Integrated Boot Strap MOSFET Switch
? APPLICATIONS
? Point of load in LCD TV, MFP

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

簡介

TPS51221屬于集成電路（IC）的線性穩(wěn)壓器控制器。由TI制造生產(chǎn)的TPS51221穩(wěn)壓器 - 線性 + 開關(guān)此產(chǎn)品族中的產(chǎn)品用于構(gòu)建執(zhí)行 DC-DC 轉(zhuǎn)換或電壓調(diào)節(jié)功能的電路，采用的是開關(guān)模式和線性穩(wěn)壓器功能的組合。雖然具體的拓撲各不相同，但此類產(chǎn)品的主要目的是將開關(guān)模式技術(shù)的效率優(yōu)勢與線性穩(wěn)壓技術(shù)的低噪聲特性結(jié)合在一起。