Interactive web site of Télécom ParisTech's ELECINF344/ELECINF381 Robotics and Embedded Systems classes (a.k.a. ROSE, 2012 session).


New USB charger schematics ready

Now I hope that this is done, for now. I chose the LTC4055 from Linear, which, besides having a Li-ion charger from USB power, it can also seamlessly switchover the source power from battery and the USB line, thus allowing the robot to be used also while recharging. The LTC4055 datasheet says that the output current is only 900µA, but, according to some feedback I got from asking to the professors and to stackexchange, I’m almost sure that this figure must be wrong (probably they meant 900mA). A design note from linear proposes a circuit that can balance the load from the USB power and the battery, which means that we can not only use the robot while it is recharging, but also to draw some power from the battery if the USB power is not enough to power the robot.

Gabriel Teixeira

Possibly related posts:

  1. USB charger plus power source done and undone
  2. Tutobot : schematics for the PCB
  3. Tutobot: power supply for the motors
  4. Tutobot – Components
  5. Teachers give their advice on Tutobot

1 comment to New USB charger schematics ready

  • You probably want to write “we chose” (instead of “I chose”), as this is a group project and the decision to include a particular component must be assumed (and defended if needed) by every group member.