Datasheet MAX1811 (Maxim)

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MAX1811 USB-Powered Li+ Charger General Description Features
The MAX1811 is a single-cell lithium-ion (Li+) battery ● Charges Single-Cell Li+ Batteries Directly from charger that can be powered directly from a USB port* or USB Port from an external supply up to 6.5V. It has a 0.5% overall ● 0.5% Overall Charging Accuracy battery regulation voltage accuracy to allow maximum utilization of the battery capacity. ● Minimal External Components The charger uses an internal FET to deliver up to 500mA ● Input Diode Not Required charging current to the battery. The device can be ● Automatic IC Thermal Regulation configured for either a 4.1V or 4.2V battery, using the ● Preconditions Near-Depleted Cells SELV input. The SELI input sets the charge current to either 100mA or 500mA. An open-drain output (CHG) ● Convenient Power SO-8 Package (1.4W) indicates charge status. The MAX1811 has preconditioning that soft-starts a
Ordering Information
near-dead battery cell before charging. Other safety features include continuous monitoring of voltage and
PART TEMP RANGE PIN-PACKAGE
current and initial checking for fault conditions before MAX1811ESA -40°C to +85°C 8 SO charging. The MAX1811 is available in a small 1.4W thermally enhanced 8-pin SO package.
Applications
● PDAs and Palmtops ● Digital Still Cameras ● MP3 Players ● Cell Phones ● Two-Way Pagers ● Hand-Held Computers
Typical Operating Circuit Typical Operating Circuit
TO LOAD TOP VIEW BATT 4.35V TO 6.5V IN SINGLE 4.2V
MAX1811
Li+ CELL SELV 1 8 CHG SELV 4.1V SELI 2 7 EN ON TO IN
MAX1811
LED OFF EN GND 3 6 GND 500mA CHG IN 4 5 BATT 100mA SELI CHG GND LOGIC OUT
SO
19-2024; Rev 3; 4/19