MAX1811 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – USB-Powered Li+ Charger

19-2024; Rev 2; 6/03
USB-Powered Li+ Charger
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.
Features
o Charges Single-Cell Li+ Batteries Directly from
USB Port
o 0.5% Overall Charging Accuracy
o Minimal External Components
o Input Diode Not Required
o Automatic IC Thermal Regulation
o Preconditions Near-Depleted Cells
o Convenient Power SO-8 Package (1.4W)
o Protected by U.S. Patent # 6,507,172
________________________Applications
PDAs and Palmtops
Digital Still Cameras
MP3 Players
Cell Phones
Two-Way Pagers
Hand-Held Computers
PART
MAX1811ESA
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
8 SO
Typical Operating Circuit
4.35V TO 6.5V
4.2V
4.1V
ON
OFF
500mA
100mA
BATT
IN
SELV
MAX1811
EN
CHG
SELI
GND
TO LOAD
SINGLE
Li+
CELL
TO IN
LED
CHG
LOGIC OUT
TOP VIEW
Pin Configuration
SELV 1
SELI 2
GND 3
IN 4
MAX1811
8 CHG
7 EN
6 GND
5 BATT
SO
* Protected by U.S. Patent # 6,507,172
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.