MAXIM MAX1811 User Manual
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)
♦ Protected by U.S. Patent # 6,507,172
MAX1811
USB-Powered Li+ Charger
________________________________________________________________ Maxim Integrated Products 1
Pin Configuration
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
Typical Operating Circuit
19-2024; Rev 2; 6/03
Ordering Information
8 SO
PIN-PACKAGETEMP RANGE
-40°C to +85°CMAX1811ESA
PART
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.
* Protected by U.S. Patent # 6,507,172
TOP VIEW
SELV
1
2
GND
3
4
87CHG
MAX1811
SO
ENSELI
GND
6
BATTIN
5
MAX1811
USB-Powered Li+ Charger
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= 4.5V, EN = IN, TA= 0°C to +85°C, unless otherwise noted.)
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.
IN, BATT, SELI, CHG, EN to GND ..............................-0.3V to 7V
SELV to GND ...............................................-0.3V to (V
IN
+ 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
Input Supply Voltage 4.35 6.50 V
Input Undervoltage Lockout IIN rising 3.75 4.05 V
Input Undervoltage Lockout Hysteresis 50 mV
Input Supply Current
Charging Headroom
Precondition Threshold
Precondition Threshold Hysteresis 80 mV
CHG Output Leakage Current VIN = V
CHG Output Low Voltage I
Charging Current
BATT Regulation Voltage
BATT Leakage Current (Input
Power Removed)
BATT Shutdown Current EN = GND, V
Logic Input Low Voltage (EN, SELI, SELV) VIN = 4.35V to 6.5V 0.8 V
Logic Input High Voltage (EN, SELI, SELV) V
Logic Input Leakage Current (EN, SELI) V
Logic Input Leakage Current (SELV) V
Thermal Regulation
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating, EN = IN, no load 0.9 2.0 mA
Shutdown, EN = GND 2.5 5.0 µA
SELI = GND (100mA mode),
= 4.35V
V
IN
SELI = IN (500mA mode) 200
BATT rising, transition from precondition to
charge mode
= 6.5V 0.1 1.0 µA
CHG
= 10mA 0.4 V
SINK
V
= V
SELI
= 5.5V, V
IN
SELI = GND, V
V
= 2V, SELI = GND or IN 20 43 70
BATT
SELV = GND, I
SELV = IN, I
V
BATT
= 4.35V to 6.5V 2.0 V
IN
= 0 to 6.5V; V
IN
= 0 to 6.5V, V
IN
BATT
= 4.2V, EN = IN = GND 1 5 µA
Die temperature beyond which charging
current is reduced
100
2.3 2.5 2.7 V
= 2.7V 455 500
BATT
= 5.5V, V
IN
= 0 4.08 4.10 4.12
BATT
= 2.7V 85 100
BATT
= 0 4.18 4.20 4.22
= 4.2V 0.1 2 µA
BATT
, VEN = 6.5V or GND 1 µA
SELI
= VIN or GND 1 µA
SELV
125 °C
mV
mA
V
MAX1811
USB-Powered Li+ Charger
_______________________________________________________________________________________ 3
Typical Operating Characteristics
(CHG unconnected, C
BATT
= 2.2µF, TA = +25°C, unless otherwise noted.)
Note 1: Specifications to -40°C are guaranteed by design and not production tested.
ELECTRICAL CHARACTERISTICS
(VIN= 4.5V, TA= -40°C to +85°C, unless otherwise noted.) (Note1)
Input Supply Voltage 4.35 6.50 V
Input Undervoltage Lockout IIN rising 3.75 4.05 V
Input Supply Current
Precondition Threshold
BATT Regulation Voltage
BATT Leakage Current (Input
Power Removed)
BATT Shutdown Current EN = GND, V
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating, EN = IN, no load 3 mA
Shutdown, EN = GND 6 µA
BATT rising, transition from precondition to
charge mode
SELV = GND, I
SELV = IN, I
= 4.2V, IN = GND 10 µA
V
BATT
= 0 4.06 4.14
BATT
= 0 4.16 4.24
BATT
= 4.2V 3 µA
BATT
2.3 2.7 V
V
SUPPLY CURRENT
vs. INPUT VOLTAGE (ENABLED)
1.0
VIN = VEN = V
0.9
0.8
0.7
0.6
(mA)
0.5
IN
I
0.4
0.3
0.2
0.1
0
01234567
SELV
V
= V
SELI
IN
V
= 0
SELI
VIN (V)
MAX1811 toc01
SUPPLY CURRENT vs. INPUT VOLTAGE
4.5
4.0
VEN = 0
3.5
3.0
2.5
(µA)
IN
I
2.0
1.5
1.0
0.5
0
0231 4567
VIN = V
(SHUTDOWN)
SELV
VIN (V)
MAX1811 toc02
CHARGE CURRENT
vs. INPUT VOLTAGE HEADROOM
500
450
V
400
350
300
(mA)
250
BATT
I
200
150
100
50
0
0 1.00.5 1.5 2.0 2.5 3.0
= V
SELI
IN
V
= 0
SELI
VIN - V
(V)
BATT
MAX1811 toc03
V
= 4.1V
BATT
= V
V
SELV
IN
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