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MAX1811ESA/T |MAX1811ESATMAXN/a2500avaiUSB-Powered Li+ Charger
MAX1811ESA+ |MAX1811ESAMAXIMN/a125avaiUSB-Powered Li+ Charger
MAX1811ESA-T |MAX1811ESATMAXN/a34avaiUSB-Powered Li+ Charger


MAX1811ESA/T ,USB-Powered Li+ ChargerApplications Ordering InformationPDAs and PalmtopsPART TEMP RANGE PIN-PACKAGEDigital Still Cameras ..
MAX1811ESA+ ,USB-Powered Li+ ChargerELECTRICAL CHARACTERISTICS(V = 4.5V, EN = IN, T = 0°C to +85°C, unless otherwise noted.)IN APARAMET ..
MAX1811ESA-T ,USB-Powered Li+ ChargerFeaturesThe MAX1811 is a single-cell lithium-ion (Li+) battery♦ Charges Single-Cell Li+ Batteries D ..
MAX1812EUB ,Dual USB Switch with Fault BlankingApplications Ordering InformationUSB Ports PART TEMP. RANGE PIN-PACKAGEUSB HubsMAX1812EUB -40°C to ..
MAX1812EUB ,Dual USB Switch with Fault Blankingfeatures to ensure  +4.0V to +5.5V Input Voltage Rangethat the USB port is protected. Built-in the ..
MAX1812EUB ,Dual USB Switch with Fault Blankingapplications. Each channel is guar- Guaranteed 500mA Load per Channelanteed to supply 500mA and me ..
MAX4674EUE+ ,3V/5V, 4 Ohm, Wideband Quad 2:1 Analog Multiplexerfeatures a low 4Ω max 6Ω max (+3V Supply)on-resistance (R ), 0.4Ω max R matching betweenON ON♦ Guar ..
MAX4674EUE+T ,3V/5V, 4 Ohm, Wideband Quad 2:1 Analog Multiplexerfeatures fast turn-on (t ) and turn-off 0.8Ω maxON(t ) times of 18ns and 6ns, respectively, and is ..
MAX4675EUT+T ,3Ω Single SPST Analog SwitchesApplications_______________Ordering InformationReed Relay ReplacementTEMP. PIN- SOTPARTRANGE PACKAG ..
MAX4678EPE ,2 / Quad / SPST / CMOS Analog SwitchesELECTRICAL CHARACTERISTICS–Dual Supplies(V+ = +5V ±10%, V- = -5V ±10%, V = +2.7V to V+, GND = 0, V ..
MAX4678EPE+ ,2Ω, Quad, SPST, CMOS Analog SwitchesApplicationsMAX4678EPE -40°C to +85°C 16 DIPReed Relay Replacement Avionics MAX4679EUE -40°C to +85 ..
MAX4678EUE ,2 / Quad / SPST / CMOS Analog SwitchesApplicationsMAX4678EPE -40°C to +85°C 16 DIPReed Relay Replacement Avionics MAX4679EUE -40°C to +85 ..


MAX1811ESA/T-MAX1811ESA+-MAX1811ESA-T
USB-Powered Li+ Charger
AVAILABLE
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 AccuracyMinimal External Components Input Diode Not RequiredAutomatic IC Thermal RegulationPreconditions Near-Depleted CellsConvenient Power SO-8 Package (1.4W)P2
USB-Powered Li+ Charger

GND
BATTIN
CHGSELI
GND
SELV
TOP VIEW
MAX1811
Pin Configuration

MAX1811
SELI
SELV4.35V TO 6.5V
4.2V
4.1V
OFF
100mA
500mA
BATT
GND
CHG
TO IN
TO LOAD
SINGLE
Li+
CELL
CHG
LOGIC OUT
LED
Typical Operating Circuit
Ordering Information

8 SO
PIN-PACKAGETEMP RANGE

-40°C to +85°CMAX1811ESA
PART
P2
MAX1811
USB-Powered Li+ Charger
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 (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
PARAMETERCONDITIONSMINTYPMAXUNITS

Input Supply Voltage4.356.50V
Input Undervoltage LockoutIIN rising3.754.05V
Input Undervoltage Lockout Hysteresis50mV
Operating, EN = IN, no load0.92.0mAInput Supply CurrentShutdown, EN = GND2.55.0µA
SELI = GND (100mA mode),
VIN = 4.35V100Charging Headroom
SELI = IN (500mA mode)200
Precondition ThresholdBATT rising, transition from precondition to
charge mode2.32.52.7V
Precondition Threshold Hysteresis80mV
CHG Output Leakage CurrentVIN = V CHG = 6.5V0.11.0µA
CHG Output Low VoltageISINK = 10mA0.4V
VSELI = VIN = 5.5V, VBATT = 2.7V455500
SELI = GND, VIN = 5.5V, VBATT = 2.7V85100Charging Current
VBATT = 2V, SELI = GND or IN204370
SELV = GND, IBATT = 04.084.104.12BATT Regulation VoltageSELV = IN, IBATT = 04.184.204.22V
BATT Leakage Current (Input
Power Removed)VBATT = 4.2V, EN = IN = GND15µA
BATT Shutdown CurrentEN = GND, VBATT = 4.2V0.12µA
Logic Input Low Voltage (EN, SELI, SELV)VIN = 4.35V to 6.5V0.8V
Logic Input High Voltage (EN, SELI, SELV)VIN = 4.35V to 6.5V2.0V
Logic Input Leakage Current (EN, SELI)VIN = 0 to 6.5V; VSELI, VEN = 6.5V or GND1µA
Logic Input Leakage Current (SELV)VIN = 0 to 6.5V, VSELV = VIN or GND1µA
Thermal RegulationDie temperature beyond which charging
current is reduced125°C
MAX1811
USB-Powered Li+ Charger
SUPPLY CURRENT
vs. INPUT VOLTAGE (ENABLED)
MAX1811 toc01
VIN (V)
IIN
(mA)
VIN = VEN = VSELV
VSELI = VIN
VSELI = 0
SUPPLY CURRENT vs. INPUT VOLTAGE
(SHUTDOWN)
MAX1811 toc02
VIN (V)
IIN
VIN = VSELV
VEN = 0
CHARGE CURRENT
vs. INPUT VOLTAGE HEADROOM
MAX1811 toc03
VIN - VBATT (V)
IBATT
(mA)VBATT = 4.1V
VSELV = VIN
VSELI = VIN
VSELI = 0
Typical Operating Characteristics

(CHGunconnected, CBATT= 2.2µF, TA = +25°C, unless otherwise noted.)
Note 1:
Specifications to -40°C are guaranteed by design and not production tested.
PARAMETERCONDITIONSMINTYPMAXUNITS

Input Supply Voltage4.356.50V
Input Undervoltage LockoutIIN rising3.754.05V
Operating, EN = IN, no load3mAInput Supply CurrentShutdown, EN = GND6µA
Precondition ThresholdBATT rising, transition from precondition to
charge mode2.32.7V
SELV = GND, IBATT = 04.064.14BATT Regulation VoltageSELV = IN, IBATT = 04.164.24V
BATT Leakage Current (Input
Power Removed)VBATT = 4.2V, IN = GND10µA
BATT Shutdown CurrentEN = GND, VBATT = 4.2V3µA
ELECTRICAL CHARACTERISTICS

(VIN= 4.5V, TA= -40°C to +85°C, unless otherwise noted.) (Note1)
MAX1811
USB-Powered Li+ Charger
Typical Operating Characteristics (continued)

(CHGunconnected, CBATT= 2.2µF, TA = +25°C, unless otherwise noted.)
CHARGE CURRENT
vs. BATTERY CURRENT
MAX1811 toc04
VBATT (V)
IBATT
(mA)
VIN = VEN = VSELV = 5.5V
VSELI = VIN
VSELI = 0
CHARGE CURENT
vs. INPUT VOLTAGE
MAX1811 toc05
VIN (V)
IBATT
(mA)
VBATT = 4.1V
VSELV = VIN
VSELI = VIN
VSELI = 0
BATTERY REGULATION VOLTAGE
vs. TEMPERATURE
MAX1811 toc06
TEMPERATURE (°C)
BATT
(V)VIN = VSELI = VEN = 4.5V
IBATT = 0
VSELV = VIN
VSELV = 0
CHARGE CURRENT
vs. TEMPERATURE
MAX1811 toc07
TEMPERATURE (°C)
IBATT
(mA)
VIN = VSELV = VEN = 5.5V, VBATT = 2.7V
VSELI = VIN
VSELI = 0
CHARGE CURRENT vs. TEMPERATURE
WITH THERMAL REGULATION
MAX1811 toc08
TEMPERATURE (°C)
BATT
(mA)
VIN = VSELV = VEN = 6.5V, VBATT = 2.7V
VSELI = VIN
VSELI = 0
THERMAL CONTROL
LOOP IN OPERATION
MAX1811
USB-Powered Li+ Charger
Pin Description
PINNAMEDESCRIPTION
SELVBattery Regulation Voltage-Select Input. A low (< 0.8V) selects a 4.1V battery regulation set point. A high
(> 2.0V) selects a 4.2V battery regulation set point.SELI
Battery Regulation Current-Select Input. A low (< 0.8V) selects a 100mA maximum battery regulation
current. A high (> 2.0V) selects a 500mA maximum battery regulation current. SELI is not diode clamped
to IN, and the voltage at VSELI can exceed the voltage at VIN.
3, 6GNDGround. Connect pins 3 and 6 to a large copper trace for maximum power dissipation.INInput Supply Voltage. Bypass with a 4.7µF capacitor to GND.BATTLi+ Battery Connection. Bypass with a capacitor no less than 2.2µF to GND. High impedance in
shutdown.
7ENEnable Input. A high (> 2.0V) enables the device. A low (< 0.8V) disables the device and places it into
shutdown mode. BATT is high impedance when disabled.CHGCharging Indicator Open-Drain Output. CHG pulls low while the device is in charge mode (2.5V
< VBATT < BATT Regulation Voltage).
CURRENT
LOOP
CURRENT-
SENSE
CIRCUIT
MAX
DETECTOR
CIRCUIT
VOLTAGE
SELECTOR
CURRENT
SELECTORREGULATOR
VOLTAGE
LOOP
THERMAL
LOOP
OVERCURRENT
DETECTOR
BATT
4.7V
BATTERY
OVERVOLTAGE
DETECTORSELI
BIAS
GNDSELV
MAX1811
CHG
(2.5V, 4.2V)
Figure 1. Functional Diagram
MAX1811
USB-Powered Li+ Charger
USB*
PORT
4.35V TO 5.5V
MAX1811
SYSTEM
LOAD
BATT
SINGLE
Li+
CELL
*WHEN USING WALL ADAPTER, IN VOLTAGE RANGE IS FROM 4.35V TO 6.5V.
Figure 2. System Configuration
Detailed Description
Charger-Control Circuitry

The voltage/current regulator consists of a voltage con-
trol loop, a current control loop, and a thermal control
loop (Figure 1). Use the SELV input to set the battery
regulation voltage to a 4.1V or 4.2V single Li+ cell. The
current and thermal loops are internally compensated
and require no external compensation. The outputs
from all loops drive an internal linear regulator. The
thermal loop modulates the current loop by limiting the
charge current if the die temperature exceeds +125°C.
The MAX1811 is in current mode when the BATT volt-
age is below the regulation set point and in voltage
mode when the BATT voltage is near the regulation set
point. The CHGoutput indicates whether the part is in
current mode (CHG= low) or voltage mode (CHG=
high impedance). Battery voltages less than 2.5V acti-
vate a 43mA preconditioning mode (CHG= high
impedance). Normal charging resumes when the bat-
tery voltage exceeds 2.5V.
System Configuration

The MAX1811 is designed to operate seamlessly with a
universal serial bus (USB) port. In a typical design, the
USB connects to the MAX1811 input, and the MAX1811
drives the load and charges the battery when enabled.
Charge-Current Selection

The MAX1811 charges a single cell Li+ battery in either
100mA or 500mA modes. The MAX1811 expects the
system to poll the USB host to determine if the USB is
capable of providing 100mA or 500mA and regulates
the charging current accordingly (Figure 2). This is to
maintain compatibility with both powered and unpow-
ered USB hosts. A powered USB host is capable of
providing 500mA, and an unpowered USB hub is limit-
ed to only 100mA.
Drive SELI low to set the charge current to the 100mA
mode. Use a 10kΩpulldown resistor to ground on SELI,
if necessary, to ensure that the MAX1811 defaults to
the 100mA mode in the event that no logic signal is
present. Drive SELI high to increase the charge current
to the 500mA mode only if the polled USB port can pro-
vide the required current.
Thermal-Control Circuitry

The thermal loop limits the MAX1811 die temperature to
+125°C by reducing the charging current as neces-
sary. The MAX1811 can operate normally with the ther-
mal loop active. This is not a fault condition and can be
used continuously. The power dissipated by the inter-
nal power FET is determined by (VIN- VBATT) ✕ICHG.
The power dissipation rating for the thermally enhanced
8-pin SO package is 1.4W at +50°C ambient (assuming
a 1in2PC board radiating area), which is the maximum
ambient temperature at which most Li+ battery manu-
facturers allow charging. The 1.4W power dissipation
may never be reached due to the MAX1811’s thermal
regulation loop.
Applications Information
USB Output Voltage

The minimum voltage to a USB-powered device may
be as low as 4.35V when cable and connector drops
are considered (Figure 3). The MAX1811 is optimized
for operation at these low input voltage levels. USB
hubs may also provide as much as 5.5V. At high input
voltages (5.5V) and low cell voltages (2.7V), the
MAX1811’s thermal loop may limit the charge current
until the cell voltage rises.
MAX1811
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