A tiny Battery charger 5V 800mA
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"
A tiny Battery charger 5V 800mA
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Please review the designer's notes (e.g., PCB thickness) and select the appropriate options.
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davidepost
Apr 13,2019
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