ADI公司的ADP5301是超低功耗降壓調節器,具有業界最高的超輕負載電源轉換效率，可延長便攜式設備的電池壽命,額定效率為90%,靜態電流僅為180 nA,工作電壓2.15V to 6.50V,非常適合物聯網(IoT)應用,包括無線傳感器網絡和可穿戴設備如健身手環和智能手表.本文介紹了ADP5301主要特性,框圖,應用電路圖,以及評估板ADP5301-EVALZ主要特性,電路圖,材料清單和PCB設計文件圖.
The ADP5301 is high efficiency, ultralow quiescent current step-down regulator that draws only 180 nA quiescent current to regulate the output at no load. The ADP5301 runs from an input startup voltage range of 2.15 V to 6.50 V, allowing the use of multiple alkaline or NiMH, Li-Ion cells, or other power sources. The output voltage is selectable from 0.8 V to 5.0 V by an external VID resistor and factory fuse. The total solution requires only four tiny external components. The ADP5301 can operate between hysteresis mode and PWM mode via the SYNC/MODE pin.
The regulator in hysteresis mode achieves excellent efficiency at a power of less than 1 mW and provides up to 50 mA of output current. The regulator in PWM mode produces a lower output ripple and supplies up to 500 mA of output current. The flexible configuration capability during operation of the device enables very efficient power management to meet both the longest battery life and low system noise requirements. The ADP5301 contains a VOUTOK flag, which monitors the output voltage and runs at a 2 MHz switching frequency in PWM mode. SYNC/MODE can synchronize to an external clock from 1.2 MHz to 2.5 MHz. Other key features in the ADP5301 include separate enabling, QOD, and safety features such as overcurrent protection (OCP), thermal shutdown (TSD), and input undervoltage lockout (UVLO). The ADP5301 is available in 9-ball, 1.65 mm × 1.87 mm WLCSP rated for a −40℃ to +125℃ junction temperature range.
ADP5301主要特性：
Input start-up voltage range: 2.15 V to 6.50 V
Operates down to 2.00 V voltage
Ultralow 180 nA quiescent current with no load
Selectable output voltage of 1.2 V to 3.6 V or 0.8 V to 5.0 V
±1.5% output accuracy over full temperature range in PWM mode
Selectable hysteresis mode or PWM operation mode
Output current Up to 50 mA in hysteresis mode
Up to 500 mA in PWM mode
VOUTOK flag monitors the output voltage
100% duty cycle operation mode
2 MHz switching frequency with optional synchronization input from 1.2 MHz to 2.5 MHz
Quick output discharge (QOD) option
UVLO, OCP, and TSD protection
9-ball, 1.65 mm × 1.87 mm
WLCSP −40℃ to +125℃ junction temperature
ADP5301應用:
Energy (gas and water) metering
Portable and battery-powered equipment
Medical applications
Keep-alive power supplies
圖1.ADP5301框圖
圖2.采用兩節堿性電池/NiMH電池ADP5301應用電路圖
評估板ADP5301-EVALZ
The ADP5301 is an ultralow power, synchronous, step-down dc-to-dc regulator with a load switch in a 9-ball WLFCSP package. The ADP5301 runs from input voltages of 2.15 V to 6.50 V and requires minimal external components to provide a high efficiency solution with integrated power switch, synchronous rectifier, and internal compensation. The ADP5301-EVALZ evaluation board provides an easy way to evaluate the device. This user guide describes how to quickly set up the board to collect performance data. Complete information about the ADP5301 is available in the ADP5301 data sheet, which should be consulted in conjunction with this user guide when using the evaluation board.
圖3.評估板ADP5301-EVALZ外形圖
圖4.評估板ADP5301-EVALZ電路圖
評估板ADP5301-EVALZ材料清單:
圖5.評估板ADP5301-EVALZ PCB設計圖(1)
圖6.評估板ADP5301-EVALZ PCB設計圖(2)
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