4
Continue slowly increasing the battery simulator power supply until the charge current drops to
approximately 70mA (7mV on the charge current DVM), then read the charger output voltage on
the DVM. This reading is the charger float voltage which will be either 4.1V or 4.2V ± 40mV
depending on which version of the demoboard is being evaluated. The program pin voltage will
indicate approximately 150mV, indicating 10% of the full programmed current.
Shutdown - Remove the SHDN jumper JP1. The charger will shut down dropping the charge
current to 0mA. Quiescent current from the input supply will remain. Replace the jumper.
Sleep Mode - with input power removed, the LTC1734 enters a sleep mode dropping the battery
drain current to near 0µA. To verify battery drain current, remove the input supply voltage or
shut the supply off, replace the 0.1Ω current sense resistor with a 1kΩ, and set the battery
simulator power supply to approximately 4V. The charge current DVM will now read battery
drain current with 1mV/µA.
Note; Athough it would take more time, this charger can also be evaluated using a
rechargeable Li-Ion battery instead of the battery simulator. If an actual battery is
used, keep the DC resistance between the charger and the battery to a
minimum, as this will affect the charge current in the constant voltage mode.
