TI 公司的bq25046 是5W(1.1A/5V)无接触充电应用的电源集成电路,适用于有线和无线电源应用,具有5V稳压输出和集成的3.3V/15mA LDO,输入电压额定值30V,15V过压保护阈值, 能给MSP430BQ1010 MCU直接供电,主要用在无线电源,智能手机,PDA,MP3播放器和低功率手持设备.本文介绍了bq25046主要特性,方框图,典型应用和无线电源系统方框图, 作无接触电源接收器的应用电路以及bqTESLA无线电源系评估套件HPA688EVM主要特性,电路图和材料清单(BOM).
bq25046：1.1A, Single-Input 5-V Power Supply IC for Contactless Charging Applications
The bq25046 is a highly integrated linear power supply IC targeted at both wired and wireless power applications. With an accurate 5-V regulated output and integrated 3.3-V LDO, the bq25046 is an ideal solution for wireless power supply solutions up to 5 W.
The bq25046 integrates several functions which enable a wireless charging solution within a small area and low component count. These include a 3.3-V LDO which drives an MSP430BQ1010 wireless controller, high-accuracy current sense for calculating receiver-side power usage, 100mA/400mA current limits enable robust communication at all load current levels, and integrated pass FET acts as load disconnect switch and 5-V regulator to protect downstream circuitry.

bq25046主要特性:
30V Input Rating, with 15V Over-Voltage Protection (OVP) Threshold
Integrated Charge Current Sense for Wireless Power Transfer
Efficiency Monitoring
3.3V, 15mA integrated Low Dropout Linear Regulator (VDD3.3)
Supplies Power to MSP430BQ1010 Directly
2% Output Voltage Regulation
Pin Selectable 100mA and 400mA Current Limit Enables Robust Communication
in Wireless Power Systems at any Output Current Level
Soft-Start Feature to Reduce Inrush Current
Status Indication – Power Good (PG) and Output Enabled (CHG)
Available in Small 2mm × 3mm DFN-10 Package
bq25046应用:
Wireless Power Applications
Smart Phones
PDAs
MP3 Players
Low-Power Handheld Devices

图1.bq25046方框图

图2.bq25046典型应用电路

图3.bq25046用作无接触电源接收器的应用电路

图4.无线电源系统方框图

The bqTESLA™ wireless power evaluation kit from Texas Instruments is a high-performance, easy-to-use development kit for the design of wireless power solutions. Consisting of a single-channel transmitter and direct-charge receiver and associated magnetics, the kit enables designers to speed the development of their end-applications. The bq500110EVM evaluation module (EVM) provides all basic functions of WPC 1.0-compliant wireless charger pad. The EVM is intended to be used with bq25046EVM or any other WPC 1.0-compliant receiver.

This transmitter EVM is a complete transmitter-side solution that powers a bqTESLA™ receiver. The bq500110EVM requires single 19-V at 0.5 A power supply to operate and combines on the single printed-circuit board the transmitter electronics, input power socket, LED indicators, and the transmitting coil. The open design allows easy access to key points of the electrical schematic. The board has installed connectors for optional JTAG and serial interfaces that can be helpful to advanced users.



图5. bqTESLA无线电源系评估套件外形图

bqTESLA无线电源系评估套件主要特性:
Single-Channel Transmitter Featuring bq500110
5V Power Supply Receiver Featuring bq25046 and MSP430bq1010
Enables Designers to Speed Development of End Applications
No Additional Software Development Required
Allows for True Plug-and-Play Functionality
Designed for Compatibility with Qi Standard

bq500110EVM-688 性能指标:


图6.HPA688EVM 电路图(1)

图7.HPA688EVM 电路图(2)

图8.HPA688EVM 电路图(3)
bq500110EVM-688评估板材料清单: