消費類電子電路圖設計中往往會涉及到4.2V鋰離子電池充電電路、及4.2V轉3.3V的LDO穩壓電路，這里分享一種簡單、便宜的設計方案：
RT9193
- 300mA,Ultra-Low Noise,Ultra-Fast CMOS LDO Regulator.
- <0.01uA Standby Current When Shutdown.
- 2.5V~5.5V Input Voltage.
SD8017
- 4.2V Li-Ion電池恆流恆壓充電芯片.
- 可編程充電電流，最大可達800mA.
- 20uA Supply Current in Shutdown.
- 5-Lead SOT-23.
- When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET.
- After the charging is completed, this pin is pulled low by internal N-channel MOSFET
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