[每日电路图] 9、介绍一种低价简单的4.2V锂电池充电及稳压(LDO)电路——RT9193，SD8017

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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