消费类电子电路图设计中往往会涉及到4.2V锂离子电池充电电路、及4.2V转3.3V的LDO稳压电路，这里分享一种简单、便宜的设计方案：
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电池恒流恒压充电芯片.
- 可编程充电电流，最大可达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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