About the article

Simple LiPo Charger

For 2 to 3 cells

Simple LiPo Charger
Lithium-polymer batteries are becoming increasingly common in new electronics equipment. They are superior in terms of both size and weight compared to NiCd and NiMH batteries. However, the charging method for LiPo cells is completely different from other battery types. In this article we present a simple but effective charger for this type of battery.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

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
C1,C5 = 10µF 25V radial
C2,C3,C4,C6,C9 = 100nF
C7 = 1µF 25V radial
C8 = 2µF2 25V radial
C10,C11 = 680nF
L1 = suppressor coil 35µH >2A (e.g. Digikey # M5727-ND)
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
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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