MAX1811ESA-T Maxim Integrated Products, MAX1811ESA-T Datasheet - Page 7

• Manufacturer Part Number: MAX1811ESA-T
• Description: Battery Management USB-Powered Li+ Charger
• Manufacturer: Maxim Integrated Products

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.
Use a minimum of 2.2µF placed close to BATT for prop-
er stability. Bypass IN to GND with a 4.7µF capacitor.
Figure 3. USB Voltage Specification
*UNDER TRANSIENT CONDITIONS, SUPPLY AT HUB CAN DROP FROM 4.00V TO 4.070V.
POWERED HUB
HOST OR
0.000V
4.750V
_______________________________________________________________________________________
Charging from AC Adapters
0.015V
4.735V
Capacitor Selection
0.110V
4.640V
REFERENCED
TO SOURCE
0.125V
4.625V
4.500V
BUS-POWERED
USB-Powered Li+ Charger
HUB
REFERENCED
TO HUB
*4.400V
0.000V
Use a larger input bypass capacitor for high input volt-
ages or high charging current to reduce supply noise.
TRANSISTOR COUNT: 1907
PROCESS: BiCMOS
Figure 4. Charging from a USB Port
100mA
4.35V TO 6.5V
4.1V
OFF
0.003V
500mA
4.397V
10kΩ
4.2V
ON
SELI
IN
SELV
EN
MAX1811
0.002V
4.378V
Chip Information
BATT
CHG
GND
GND
4.375V
0.025V
4.350V
LOW-POWER
FUNCTION
LED
TO LOAD
CHG
LOGIC OUT
SINGLE
Li+
CELL
TO IN
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