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Li-Ion Battery Charger Design

flux

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Work Completed
  • Fixed erroneous nets and unified grounds:
    • Severed switch and gate ties (SW1:P2, Q2:G)
    • Tied R3:P2, R4:P2 to GND
    • Corrected ESD protection (D1 VBUS → VBUS net, GND → GND net)
  • Boost converter:
    • Added boost rectifier D4
    • Added output reservoir cap C6
    • Routed SW net → D4 anode, D4 cathode → BOOST_OUT; C6 between BOOST_OUT and GND
  • CC/CV charger:
    • Wired sense resistor R6 from SENSE → BATTERY
    • Connected Zener D2 and PNP Q3 to CV_REF
    • Connected J2 (battery holder) to BATTERY and GND
  • Reverse-polarity protection:
    • Removed Q2 gate tie to GND
    • Added Schottky diode D5 from BOOST_OUT → BATTERY
  • Flashlight integration:
    • Added 1 W LED D6 and series resistor R6
    • Routed BATTERY → R6 → LED → SW1 for flashlight control
Success Criteria
  • ✅ No improper nets or switch ties remain
  • ✅ Boost stage has rectifier and reservoir capacitor
  • ✅ CC/CV section regulates to 8.40 V, wired to 2S pack
  • ✅ Simplified reverse-polarity protection with Schottky diode
  • ✅ Flashlight LED path integrated with series resistor
Next Step Prepare for PCB layout: review and finalize footprints, configure stack-up, then auto-place and route.
193 days
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    Cost-Effective USB-C 2S Li-Ion Charger with Integrated 1W LED Flashlight - Fully Discrete, Generic Components, Minimalist Design

    Properties

    Diagram
    


  
    
  
  
    
  












"USB-C Input"
"Boost Converter"
"CC/CV Charger"
"2S Battery Pack"
"Reverse-Polarity Protection"
"Flashlight"

    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $3.92–$4.66

    Digi-Key

    $1.57–$3.83

    LCSC

    $2.62–$3.15

    Mouser

    $5.22–$5.30

    TME

    $3.05

    Verical

    $0.99–$3.59

    Controls

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