Simple LiPo Charger
For 2 to 3 cells
Materials
Gerber file
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Component list
R1 = 49k?9 1%
R2 = 12k?4 1%
R3 = 270?
R4 = 11k?3 1%
R5 = 4k?87 1%
R6,R8,R9,R14,R18 = 1k?
R7 = 1? 2W
R10 = 301k? 1%
R11 = 174k? 1%
R12 = 1k?5 1%
R13 = 10?
R15 = 121k? 1%
R16 = 60k?4 1%
R17 = 30k?1 1%
R19 = 1k? 1%
R20 = 27k?
R21 = 4k?7
Capacitors:
C1,C5 = 10µF 25V radial
C2,C3,C4,C6,C9 = 100nF
C7 = 1µF 25V radial
C8 = 2µF2 25V radial
C10,C11 = 680nF
Inductors:
L1 = suppressor coil 35µH >2A (e.g. Digikey # M5727-ND)
Semiconductors:
D1 = 1N5400 (e.g., Digikey # 1N5400RLOSCT-ND)
D2,D3 = 31DQ04 (e.g., Digikey # 31DQ04-ND)
D4 = LED, red, low-current
D5 = LED, green, low-current
IC1 = LT1510CN (Linear Technology, www.linear.com)
IC2 = TLC272CP (e.g., Digikey # 296-1824-5-ND)
IC3 = LM385BLP-2.5 (e.g., Digikey # 296-9559-5-ND)
T1 = BC557
Miscellaneous:
S1,S2 = switch, on/off
K1 = 2-way PCB terminal block, lead pitch 5mm
K2 = 10-way (2x5) pinheader with 1 jumper
Bt1 = 2 PCB solder pins (battery connection)
1 wire link
Enclosure, e.g., Hammond type 1591B
PCB, ref. 050010-1 available from ThePCBShop
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