MAX1879EUA ,Simple / Efficient / 1-Cell Li+ Pulse ChargerELECTRICAL CHARACTERISTICS(V = V = +10V, V = +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnect ..
MAX1879EUA ,Simple / Efficient / 1-Cell Li+ Pulse ChargerApplicationsOrdering InformationSingle-Cell Li+ Powered PortablesPART TEMP. RANGE PIN-PACKAGESelf- ..
MAX1879EUA ,Simple / Efficient / 1-Cell Li+ Pulse ChargerFeaturesThe MAX1879 single-cell lithium-ion (Li+) battery charger Simple Design Minimizes Heatutil ..
MAX1879EUA+ ,Simple, Efficient, 1-Cell Li+ Pulse ChargerApplicationsOrdering InformationSingle-Cell Li+ Powered PortablesPART TEMP. RANGE PIN-PACKAGESelf- ..
MAX1879EUA+ ,Simple, Efficient, 1-Cell Li+ Pulse ChargerFeaturesThe MAX1879 single-cell lithium-ion (Li+) battery charger♦ Simple Design Minimizes Heatutil ..
MAX1879EUA+T ,Simple, Efficient, 1-Cell Li+ Pulse ChargerELECTRICAL CHARACTERISTICS(V = V = +10V, V = +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnect ..
MAX481EPA+ ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversApplicationsMAX481EESA -40°C to +85°C 8 SOIndustrial-Control Local Area Networks MAX483ECPA 0°C to ..
MAX481ESA ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversGeneral Description ________
MAX481ESA ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversFeaturesThe MAX481, MAX483, MAX485, MAX487–MAX491, and' In µMAX Package: Smallest 8-Pin SOMAX1487 a ..
MAX481ESA ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversFeaturesThe MAX481, MAX483, MAX485, MAX487–MAX491, and' In µMAX Package: Smallest 8-Pin SOMAX1487 a ..
MAX481ESA+ ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversApplications:MAX491E, and MAX1487E are low-power transceivers forMAX3430: ±80V Fault-Protected, Fai ..
MAX481ESA+ ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversELECTRICAL CHARACTERISTICS(V = 5V ±5%, T = T to T , unless otherwise noted.) (Notes 1, 2)CC A MIN M ..
MAX1879EUA
Simple / Efficient / 1-Cell Li+ Pulse Charger
General DescriptionThe MAX1879 single-cell lithium-ion (Li+) battery charger
utilizes an efficient pulse-charging architecture to minimize
power dissipation in portable devices. This architecture
combines the efficiency of switch-mode chargers with the
simplicity and low cost of linear chargers. This simple
device, in conjunction with a current-limited wall cube and
a PMOS transistor, allows safe and fast charging of a sin-
gle Li+ cell.
The MAX1879 initiates charging in one of three ways: bat-
tery insertion, charger power-up, or toggling the THERM
pin. Key safety features include continuous voltage and
temperature monitoring, a preset charger time-out, and an
8mA precharge current mode to charge near-dead cells.
Automatic detection of input power removal shuts down
the device, minimizing current drain from the battery. An
overall system accuracy of 0.75% ensures that the cell
capacity is fully utilized without cycle life degradation.
The MAX1879 is offered in a space-saving 8-pin µMAX
package. An evaluation kit (MAX1879EVKIT) is available
to help reduce design time.
ApplicationsSingle-Cell Li+ Powered Portables
Self-Charging Battery Packs
PDAs
Cell Phones
Cradle Chargers
FeaturesSimple Design Minimizes HeatLow Component Count, No InductorBattery-Full Indicator0.75% Accurate Battery Regulation1.5µA (max) Battery Current Drain with Wall Cube
RemovedRestart Charging at 4.0VContinuous Overvoltage and Overtemperature
ProtectionSafely Precharges Near-Dead CellsAutomatic Power-Down when Power Source is
RemovedCharges 1 Cell from as Low as 4.5VPin-Compatible Upgrade to MAX1679
MAX1879
Simple, Efficient, 1-Cell Li+ Pulse Charger19-2061; Rev 0; 5/01
Ordering Information
Typical Operating CircuitPin Configuration
IN, CHG, GATE to GND..........................................-0.3V to +26V
BATT, TSEL, THERM, ADJ to GND...........................-0.3V to +6V
GATE to IN................................................................-6V to +0.3V
THERM, ADJ to BATT...............................................-6V to +0.3V
GATE Continuous Current................................................-10mA
Continuous Power Dissipation (TA= +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C)............330mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range............................-65°C to +150°C
Lead Temperature (soldering, 10s)................................+300°C
MAX1879
Simple, Efficient, 1-Cell Li+ Pulse Charger
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= VCHG= +10V, VBATT= +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnected, THERM = 10kΩto GND, TA
= 0°C to
+85°C, unless otherwise noted. Typical values are at TA= +25°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.
MAX1879
Simple, Efficient, 1-Cell Li+ Pulse Charger
ELECTRICAL CHARACTERISTICS (continued)(VIN= VCHG= +10V, VBATT= +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnected, THERM = 10kΩto GND, TA
= 0°C to
+85°C, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS(VIN= VCHG= +10V, VBATT= +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnected, THERM = 10kΩto GN, TA
= -40°C to
MAX1879
Simple, Efficient, 1-Cell Li+ Pulse Charger
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VCHG= +10V, VBATT= +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnected, THERM = 10kΩto GND,= -40°C to +85°C, unless otherwise noted.) (Note 5)
Note 1:The input voltage range is specified with the external PMOS FET off. When charging, the PMOS FET turns on, and the input
voltage (the output voltage of the current-limited source) drops to very near the battery voltage. When the PFET is on, VIN
may be as low as 2.5V.
Note 2:Restart Threshold tracks battery regulation voltage adjustment.
Note 3:Glitches less than 1ms do not cause a restart.
Note 4:This current is less than 1.5µA, even if an external RADJresistor is connected from ADJ to GND.
Note 5:Specifications to -40°C are guaranteed by design and not production tested.
MAX1879
Simple, Efficient, 1-Cell Li+ Pulse Charger
MAX1879 toc01
NORMALIZED TIMER PERIOD
TEMPERATURE (°C)
NORMALIZED TIMER PERIOD
vs. AMBIENT TEMPERATURE
MAX1879 toc02
TEMPERATURE (°C)
NORMALIZED REGULATION VOLTAGE
NORMALIZED BATTERY REGULATION
VOLTAGE vs. TEMPERATURE
MAX1879 toc03
VIN (V)
PRECHARGE CURRENT (mA)
PRECHARGE CURRENT
vs. INPUT VOLTAGE
Typical Operating Characteristics
(VIN= CHG= +10V, VBATT= +4.2V, THERM = 10kΩto GND, TA= +25°C, unless otherwise noted.)
MAX1879
Simple, Efficient, 1-Cell Li+ Pulse Charger
Functional Diagram
