Understanding IC1 Functionality

I found several charger ICs that fit your requirements for a Li-ion cell with integrated power-path management and status outputs:

Table


Part NamePart UidMPNPackageKey FeaturesDatasheet
BQ21040DBV6dd9569f-3c53-4290-918a-413d824b3689BQ21040DBVSOT-23-60.8 A linear charger, input up to 30 V, open-drain CHG/STAT outputs, thermal regulation, I²C status monitoring.PDF
MP2662GC-XXXX-Pf0b65ee2-deac-457e-a003-342030408b1cMP2662GC-XXXX-PWLCSP-9500 mA switching charger, integrated power-path, seamless battery/system switchover, < 1 μA standby, programmable termination current, thermistor input.PDF
BQ24075RGTT (module)bef207fe-d163-4ea0-b898-afdf21e53f84BQ24075 (module)DFN-10Reference module using BQ24075RGTT, 1 A switch-mode charger, power-path management between VIN, BAT, SYS, dual status flags, battery thermistor, minimal external parts.PDF
Recommendation rationale:
  • BQ21040DBV is compact (SOT-23-6) and provides up to 0.8 A charge current with standard status outputs—great if you can trade efficiency for simplicity.
  • MP2662GC-XXXX-P offers a fully integrated switching approach (higher efficiency, smaller standby current) in a tiny WLCSP.
  • BQ24075 module is ideal if you prefer a turnkey reference design with minimal layout risk and full power-path control.
Let me know if you’d like to dive deeper into any option or see alternative form-factors!
Add MP2662GC
Calc charge resistor
MP2662 capacitors
Layout guidelines
Select thermistor


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PCB Business Card NFC Template ivtQ

PCB Business Card NFC Template ivtQ thumbnail
Change History from V1: -Font Bigger for SMD Footprint and IC designators -Confirmed that V1 worked for LED energy harvesting and NFC write/read
Forked an amazing PCB business card from Mark Wu and added a SMD footprint and silkscreen art.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Digi-Key

$6.27–$8.50

LCSC

$12.81–$13.72

Mouser

$9.67

Controls