TI公司的TPS61094是帶旁路開關(guān)的同步雙向降壓/升壓轉(zhuǎn)換器,具有寬輸入電壓范圍和輸出電壓,高達5.5V.當TPS61094工作在降壓模式和給超級電容充電,充電電流和終點電壓可用兩個外接電阻可編程, 當TPS61094工作在升壓模式,輸出電壓可用外接一個電阻編程.在自動降壓或升壓模式(EN = 1, MODE = 1),當輸入電源加電時,器件旁路輸入電壓到輸出,同時能對備份超級電容進行充電.當輸入電源未連接或低于輸出目標電壓, TPS61094進入升壓模式,從備份超級電容調(diào)整輸出電壓.在這種模式, TPS61094消耗60nA靜態(tài)電流.器件支持真關(guān)斷模式(EN= 0, MODE = 1)和強迫旁通模式(EN = 0, MODE = 0).在真關(guān)斷模式, TPS61094完全不連接負載和輸入電源.在支持強迫旁通模式,器件直接通過盤路開關(guān)連接負載到輸入電壓,器件僅消耗4nA電流,以獲得長電池壽命.器件的旁路開關(guān)電阻為 100-mΩ,開關(guān)頻率為1MHz.器件具有輸出短路保護和熱關(guān)斷保護.采用2mmx3mm 12引腳WSON封裝.主要用在氣表和水表,手持醫(yī)療設(shè)備和能量收獲.本文介紹了TPS61094主要特性, 功能框圖,多種典型應(yīng)用電路, 評估模塊TPS61094EVM-066主要特性,電路圖,材料清單和PCB設(shè)計圖.
The TPS61094 is a synchronous bi-directional buck/boost converter with bypass switch. The device provides a power supply solution for smart meter and super capacitor backup power applications.
The TPS61094 has a wide input voltage range and output voltage up to 5.5 V. When the TPS61094 works in Buck mode and charges the supercap, the charging current and the termination voltage are programmable with two external resistors. When the TPS61094 works in Boost mode, the output voltage is programmable with an external resistor.
During automatic Buck or Boost mode (EN = 1, MODE = 1), when the input power supply is applied, the device bypasses the input voltage to the output while it is capable of charging a backup supercap.
When the input power supply is disconnected or lower than the output target voltage, the TPS61094 enters Boost mode and regulates output voltage from a backup supercap. The TPS61094 consumes 60-nA quiescent current in this mode.
The TPS61094 supports True shutdown mode (EN= 0, MODE = 1) and the Forced bypass mode (EN = 0, MODE = 0). In True shutdown mode, the TPS61094 completely disconnects the load from the input supply. When supporting Forced bypass mode, the TPS61094 connects the load to the input voltage directly through a bypass switch and only consumes 4-nA current to achieve long battery life.
TPS61094主要特性:
• Wide voltage range and current range
– 0.7-V to 5.5-V input voltage range
– 1.8-V minimum input voltage for start-up
– Programmable boost output voltages, 2.7-V to 5.4-V setting range
– Programmable buck charging termination voltages, 1.7-V to 5.4-V setting range
– Programmable buck charging output currents, 2.5-mA to 600-mA setting range
• Ultra-low quiescent current
– 60 nA in boost mode or buck charging mode
– 4 nA in forced bypass mode
• High efficiency and power capability
– Minimum 1.4-A inductor valley current limit
– Two 60-mΩ (LS) / 140-mΩ (HS) MOSFETs
– 100-mΩ bypass switch resistance
– 1-MHz switching frequency
– Auto snooze mode operation at light load
– Up to 92.3% efficiency at VIN = 3 V, VOUT = 3.6 V, and IOUT = 10 μA
– Up to 96.3% efficiency at VIN = 3 V, VOUT = 3.6 V, and IOUT = 100 mA
• Four operation modes controlled by the MODE and EN pins
• Rich protection
– Output short-circuit protection
– Thermal shutdown protection
• 2-mm × 3-mm 12-pin WSON package
TPS61094應(yīng)用:
• Gas meter, water meter
• Portable medical equipment
• Energy harvest
圖1. TPS61094典型應(yīng)用電路(1)
圖2. TPS61094典型應(yīng)用電路(2)
圖3. TPS61094功能框圖
圖4. TPS61094鋰電池3.6V帶旁路升壓轉(zhuǎn)換器應(yīng)用電路(1)
圖5. TPS61094 5V輸入3.3V升壓轉(zhuǎn)換器帶自動降壓或升壓功能(2)
評估模塊TPS61094EVM-066
This users guide describes the schematic, layout, bill of materials (BOM), and setup of the evaluation module (EVM) for the TPS61094EVM-066. It can supply the Vout to programed target from 2.7 V~5.4 V with Vin low to 1.8 V. The TPS61094EVM-066 supports four operating modes with different jumpers configuration, including force bypass, true shotdown, force buck, and auto buck or Boost.
圖6. 評估模塊TPS61094EVM-066外形圖
圖7. 評估模塊TPS61094EVM-066電路圖
評估模塊TPS61094EVM-066材料清單:
圖8. 評估模塊TPS61094EVM-066 PCB設(shè)計圖:頂層布局
圖9. 評估模塊TPS61094EVM-066 PCB設(shè)計圖:內(nèi)層1布局
圖10. 評估模塊TPS61094EVM-066 PCB設(shè)計圖:內(nèi)層2布局
圖11. 評估模塊TPS61094EVM-066 PCB設(shè)計圖:底層布局 |
