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