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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1811 Datasheet

USB-Powered Li+ Charger

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MAX1811 pdf
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1811 Datasheet

USB-Powered Li+ Charger

No Preview Available !

MAX1811 pdf
USB-Powered Li+ Charger
ABSOLUTE MAXIMUM RATINGS
IN, BATT, SELI, CHG, EN to GND ..............................-0.3V to 7V
SELV to GND ...............................................-0.3V to (VIN + 0.3V)
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 17.5mW/°C above +70°C)....................1.4W
Short-Circuit Duration.................................................Continuous
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Maximum Die Temperature..............................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = 4.5V, EN = IN, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
Input Supply Voltage
Input Undervoltage Lockout
Input Undervoltage Lockout Hysteresis
Input Supply Current
Charging Headroom
Precondition Threshold
Precondition Threshold Hysteresis
CHG Output Leakage Current
CHG Output Low Voltage
Charging Current
BATT Regulation Voltage
BATT Leakage Current (Input
Power Removed)
BATT Shutdown Current
Logic Input Low Voltage (EN, SELI, SELV)
Logic Input High Voltage (EN, SELI, SELV)
Logic Input Leakage Current (EN, SELI)
Logic Input Leakage Current (SELV)
Thermal Regulation
CONDITIONS
IIN rising
Operating, EN = IN, no load
Shutdown, EN = GND
SELI = GND (100mA mode),
VIN = 4.35V
SELI = IN (500mA mode)
BATT rising, transition from precondition to
charge mode
VIN = VCHG = 6.5V
ISINK = 10mA
VSELI = VIN = 5.5V, VBATT = 2.7V
SELI = GND, VIN = 5.5V, VBATT = 2.7V
VBATT = 2V, SELI = GND or IN
SELV = GND, IBATT = 0
SELV = IN, IBATT = 0
VBATT = 4.2V, EN = IN = GND
EN = GND, VBATT = 4.2V
VIN = 4.35V to 6.5V
VIN = 4.35V to 6.5V
VIN = 0 to 6.5V; VSELI, VEN = 6.5V or GND
VIN = 0 to 6.5V, VSELV = VIN or GND
Die temperature beyond which charging
current is reduced
MIN
4.35
3.75
TYP
50
0.9
2.5
100
200
MAX
6.50
4.05
2.0
5.0
UNITS
V
V
mV
mA
µA
mV
2.3 2.5 2.7
V
20
4.08
4.18
80
0.1
455
85
43
4.10
4.20
1.0
0.4
500
100
70
4.12
4.22
mV
µA
V
mA
V
1 5 µA
0.1 2 µA
0.8 V
2.0 V
1 µA
1 µA
125 °C
2 _______________________________________________________________________________________


Part Number MAX1811
Description USB-Powered Li+ Charger
Maker Maxim
Total Page 8 Pages
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