It use a MCP7386 (U4) for recharging the battery and a LTC3402EMS (U2) for converting the voltage up to 5V.

I decide to make it for a little cam recorder that use a raspberry pi zero.


The connector makes available the following voltages:

1: +Vbat, the positive terminal of the battery

2: SW1, terminal for an external switch for detaching the battery from the boost converter and consequently turn off the power supply. It's connected to the same terminal as the Vbat.

3: SW2, the other terminal for the external switch.

4: +5V the output voltage of the boost converter

5: GND

6: GND


The diodes D1, D2, D5 are used for showing the status of the battery.

The connector J4 is a mini USB connector for providing the voltage and recharge the battery.


The BOM is the following:


"RefDes","Value","Pattern"

"C19","100nF","CAP_0603"

"C20","470nF","CAP_0603"

"C21","100nF","CAP_0603"

"C22","10uF","CAP_1206"

"C23","100u","CAPAE-5.3x5.3h7"

"C24","100nF","CAP_0603"

"C25","100nF","CAP_0603"

"C27","100u","CAPAE-5.3x5.3h7"

"C28","100nF","CAP_0603"

"D1","","DIO_0603"

"D2","","DIO_0603"

"D3","","SMB"

"D4","","DIO_0603"

"D5","","DIO_0603"

"D6","","SMB"

"D7","","SMB"

"J4","","934"

"J5","","HDR-1x6T/2.54/15x2"

"L1","","SRP7030F"

"Q1","","SOT23"

"R13","6.19k","RES_0603"

"R14","7.3k","RES_0603"

"R15","10k","RES_0603"

"R16","6.19k","RES_0603"

"R23","6.19k","RES_0603"

"R24","2.2k","RES_0603"

"R25","1.19k","RES_0603"

"R26","0R","RES_0603"

"R27","10k","RES_0603"

"R30","10k","RES_0603"

"R31","6.19k","RES_0603"

"R32","6.19k","RES_0603"

"R33","6.19k","RES_0603"

"R34","6.19k","RES_0603"

"TP1","","TESTPOINT"

"TP2","","TESTPOINT"

"TP3","","TESTPOINT"

"U4","","SOJ-16/8.65x1.27"

"U5","","MSOP-10"


Apr 13,2019
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