USB-Powered Li+ Charger
Charging from AC Adapters
The MAX1811 also operates from sources other than
USB ports. The full charging input voltage range is
4.35V to 6.5V. When charging in the 500mA mode with
an AC adapter, rely on the thermal loop to limit the
power dissipation by limiting the charge current at
higher input voltages if limited PC board area is avail-
able to dissipate heat.
Capacitor Selection
Use a minimum of 2.2µF placed close to BATT for prop-
er stability. Bypass IN to GND with a 4.7µF capacitor.
Use a larger input bypass capacitor for high input volt-
ages or high charging current to reduce supply noise.
Chip Information
TRANSISTOR COUNT: 1907
PROCESS: BiCMOS
*UNDER TRANSIENT CONDITIONS, SUPPLY AT HUB CAN DROP FROM 4.00V TO 4.070V.
