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TI公司的TPS62730是高頻超低功耗同步降壓DC/DC轉換器，非常適合用在低功耗小于1GHz和2.4GHz RF收發器。TPS62730輸入電壓從1.9V到3.9V，超低功耗旁路模式的功耗為30nA，DC/DC轉換器靜態電流25uA，開關頻率高達3MHz,DC/DC效率高達95%，輸出峰值電流高達100mA，主要用在CC2540藍牙低功耗系統級解決方案，低功耗無線應用和RF4CE表。本文介紹了TPS62730主要特性，功能方框圖，典型應用電路以及TPS62730EVM-726評估模塊主要特性，電路圖和材料清單。 The TPS62730 is a high frequency synchronous step down DC-DC converter optimized for ultra low power wireless applications. The device is optimized to supply TI’s Low Power Wireless sub 1GHz and 2.4GHz RF transceivers and System-On-Chip-solutions. The TPS62730 reduces the current consumption drawn from the battery during TX and RX mode by a high efficient step down voltage conversion. It provides up to 100mA output current and allows the use of tiny and low cost chip inductors and capacitors. With an input voltage range of 1.9V to 3.9V the device supports Li-primary battery chemistries such as Li-SOCl2, Li-SO2, Li-MnO2 and also two cell alkaline batteries. The TPS62730 features an Ultra Low Power bypass mode with typical 30nA current consumption to support sleep and low power modes of TI’s CC2540 Bluetooth Low Energy and CC430 System-On-Chip solutions. TPS62730主要特性： Input Voltage Range VIN from 1.9V to 3.9V Typ. 30nA Ultra Low Power Bypass Mode Typ. 25 µA DC/DC Quiescent Current Internal Feedback Divider Disconnect Typ. 2.1Ω Bypass Switch between VIN and VOUT Automatic Transition from DC/DC to Bypass Mode Up To 3MHz switch frequency Up to 95% DC/DC Efficiency Open Drain Status Output STAT Output Peak Current up to 100mA Fixed Output Voltage 2.1V Small External Output Filter Components 2.2µH/ 2.2µF Optimized For Low Output Ripple Voltage Small 1 × 1.5 × 0.6mm3 SON Package 12 mm2 Minimum Solution Size TPS62730應用： CC2540 Bluetooth Low Energy System-On-Chip Solution Low Power Wireless Applications RF4CE, Metering 
圖1。TPS62730功能方框圖
圖2。TPS62730典型應用電路圖
圖3。TPS62730用于CC2540的電路圖
圖4。TPS62730用于CC430的電路圖 TPS62730EVM-726評估模塊 The TPS62730EVM-726 evaluation module (EVM) helps designers evaluate the operation and performance of the TPS62730 step-down converter. The user’s guide describes the TPS62730 evaluation module, how to perform a stand-alone evaluation or interface with a host or system. The converter is designed to deliver up to 100 mA of continuous current to the output. The converter can be switched into bypass mode by grounding the ON/BYP pin or automatically with the input voltage falling to the output regulation voltage. The TPS62730 device is a high-frequency synchronous stepdown dc-dc converter optimized for ultralow-power wireless applications. The device is optimized to supply TI’s low-power wireless sub-1-GHz and 2.4-GHz RF transceivers. The TPS62730 reduces the current consumption drawn from the battery during TX and RX modes by a highly efficient stepdown voltage conversion. It provides up to 100-mA output current and allows the use of tiny and low-cost chip inductors and capacitors. This device supports most Li-ion primary battery chemistries, with an input range of 1.9 V to 3.9 V dc. The TPS62730 features an ultralow-power bypass mode with a typical 30 nA current consumption to support low-power modes of modern RF transceivers. In this bypass mode, the input is connected the VOUT pin via an internal 2-Ω bypass FET. The device automatically enters bypass mode when the input (battery) voltage falls to the bypass transition threshold. TPS62730EVM-726評估模塊主要特性： Input Voltage Range V IN from 1.9V to 3.9V Typ. 30nA Ultra Low Power Bypass Mode Typ. 25 µA DC/DC Quiescent Current Internal Feedback Divider Disconnect Typ. 2.5Ω Bypass Switch between V IN and VOUT Automatic Transition from DC/DC to Bypass Mode Up To 3MHz switch frequency Up to 95% DC/DC Efficiency Open Drain Status Output STAT Output Peak Current up to 100mA Fixed Output Voltage Options 2.1V, 2.05V and 1.9V Small External Output Filter Components 2.2µH/ 2.2µFv Optimized For Low Output Ripple Voltage Small 1 × 1.5 × 0.6mm3 SON Package 12 mm2 Minimum Solution Size
圖5。TPS62730EVM-726評估模塊外形圖
圖6。TPS62730EVM-726評估模塊電路圖和建立圖
圖7。TPS62730EVM-726評估模塊電路圖 TPS62730EVM-726評估模塊材料清單：
詳情請見： http://focus.ti.com/lit/ds/symlink/tps62730.pdf 和 http://focus.ti.com/lit/ug/slvu455/slvu455.pdf |
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