MAX1879EUA+-MAX1879EUA+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1879EUA+T ,Simple, Efficient, 1-Cell Li+ Pulse ChargerELECTRICAL CHARACTERISTICS(V = V = +10V, V = +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnect ..
MAX187ACWE ,+5V, Low-Power, 12-Bit Serial ADCsELECTRICAL CHARACTERISTICS(VDD = +5V ±5%; GND = 0V; unipolar input mode; 75ksps, fCLK = 4.0MHz, ext ..
MAX187ACWE+ ,+5V, Low-Power, 12-Bit Serial ADCsMAX187/MAX18919-0196; Rev 0; 10/93+5V, Low-Power, 12-Bit Serial ADCs__________________
MAX187AEPA+ ,+5V, Low-Power, 12-Bit Serial ADCsApplicationsMAX187BC/D 0°C to +70°C Dice* ±1Portable Data LoggingOrdering Information continued on ..
MAX187AEWE ,+5V, Low-Power, 12-Bit Serial ADCsELECTRICAL CHARACTERISTICS(VDD = +5V ±5%; GND = 0V; unipolar input mode; 75ksps, fCLK = 4.0MHz, ext ..
MAX187AEWE+ ,+5V, Low-Power, 12-Bit Serial ADCsFeaturesThe MAX187/MAX189 serial 12-bit analog-to-digital ' 12-Bit Resolution1converters (ADCs) ope ..
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 ..
MAX481ESA+T ,±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 ..
MAX481MJA ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversMAX481/MAX483/MAX485/MAX487–MAX491/MAX148719-0122; Rev 5; 2/96Low-Power, Slew-Rate-LimitedRS-485/RS ..
MAX4820EUP ,+3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel InterfaceApplications*For maximum heat dissipation, packages have an exposed pad(EP) on the bottom. Solder e ..
MAX4820EUP+ ,+3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel InterfaceELECTRICAL CHARACTERISTICS(V = +3V to +5.5V, V = V , T = -40°C to +85°C, unless otherwise noted. Ty ..

MAX1879EUA+-MAX1879EUA+T
Simple, Efficient, 1-Cell Li+ Pulse Charger
General Description
The 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.
Applications
Single-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 Charger
19-2061; Rev 0; 5/01
EVALUATION KIT AVAILABLE
Ordering Information
PART TEMP. RANGEPIN-PACKAGE
MAX1879EUA -40°C to +85°C8-µMAX
BATT
GND
1-CELL
Li+
BATTERY
THERMADJ
GATE
CURRENT-
LIMITED
AC WALL
ADAPTER
PULSE WIDTH
SELECT INPUT
CHG
LED
THERMISTOR
MAX1879
TSEL
GND
ADJTSEL
BATT
THERMGATE
μMAX
TOP VIEW
MAX1879
CHG
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.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Input Voltage (Note 1)VINExternal PMOS FET off4.422V
Undervoltage Lockout Trip PointBATT rising2.12.22.3V
Undervoltage Lockout Trip-Point
HysteresisBATT falling60mV
Fast-Charge Qualification
Threshold
BATT rising, transition from precharge to
full current2.4252.52.575V
Fast-Charge Restart ThresholdBATT falling, transition from Done to
Prequalification state (Note 2)3.924.004.08V
Fast-Charge Reset Threshold
Delay(Note 3)1ms
Precharge Source CurrentVBATT = 2V5 812mA
BATT Regulation Voltage4.16854.20004.2315V
BATT Regulation Adjust Range4.04.2V
ADJ Source Impedance9.81010.2kΩ
ADJ Output VoltageNo load on ADJ1.3931.4001.407V
BATT Removal Detection
ThresholdBATT rising4.87555.125V
BATT Removal Detection
Threshold HysteresisBATT falling125mV
BATT Input Current (Note 4)VIN ≤ VBATT - 0.3V0.11.5µA
BATT Input Current, Fast-Charge
StateIBATTVBATT = 4.0V9001500µA
BATT Input Current, Done StateIBATTVBATT = 4.25V, VIN present85200µA
IN Input Current, Fast-Charge
StateIINVBATT = 4.0V, VIN = 4.0V50500µA
IN Input Current, Done StateIINVBATT = 4.25V, VIN = 22V7001200µA
Timer Accuracy-10+10%
CHG Output Leakage CurrentV CHG = 22V, CHG = high-1+1µA
CHG Output Sink CurrentV CHG = 1.0V, CHG = low456mA
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.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
THERM Sense Current (for hot
qualification)346352.9360µA
THERM Sense Current (for cold
qualification)47.848.849.8µA
THERM Sense Voltage Trip Point1.3791.401.421V
GATE Source CurrentVIN = 10V, VGATE = 8V75100125µA
GATE Sink CurrentVIN = 10V, VGATE = 8V192531µA
GATE Drive Current at Battery
RemovalVBATT = 5.1V, gate driven high184060mA
ELECTRICAL CHARACTERISTICS
(VIN= VCHG= +10V, VBATT= +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnected, THERM = 10kΩto GN, TA= -40°C to
+85°C, unless otherwise noted.) (Note 5)
PARAMETERSYMBOLCONDITIONSMINMAXUNITS
Input Voltage (Note 1)VINExternal PMOS FET off4.622V
Undervoltage Lockout Trip PointBATT rising2.052.35V
Fast-Charge Qualification
Threshold
BATT rising, transition from precharge to
full current2.352.65V
Fast-Charge Restart ThresholdBATT falling, transition from Done to
Prequalification state (Note 2)3.884.12V
Precharge Source CurrentVBATT = 2V4.512mA
BATT Regulation Voltage4.1374.263V
BATT Regulation Adjust Range4.04.2V
ADJ Source Impedance9.810.2kΩ
ADJ Output VoltageNo load on ADJ1.3831.417V
BATT Removal Detection
ThresholdBATT rising4.855.15V
BATT Input Current (Note 4)VIN ≤ VBATT - 0.3V1.5µA
BATT Input Current, Fast-Charge
StateIBATTVBATT = 4.0V1500µA
BATT Input Current, Done StateIBATTVBATT = 4.25V, VIN present300µA
IN Input Current, Fast-Charge
StateIINVBATT = 4.0V, VIN = 4.0V600µA
IN Input Current, Done StateIINVBATT = 4.25V, VIN = 22V1500µA
CHG Output Leakage CurrentV CHG = 22V, CHG = high-1+1µA
CHG Output Sink CurrentV CHG = 1.0V, CHG = low46mA
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)
PARAMETERSYMBOLCONDITIONSMINMAXUNITS
THERM Sense Current (for hot
qualification)342363µA
THERM Sense Current (for cold
qualification)47.350.3µA
THERM Sense Voltage Trip Point1.3581.442V
GATE Source CurrentVIN = 10V, VGATE = 8V60140µA
GATE Sink CurrentVIN = 10V, VGATE = 8V1535µA
GATE Drive Current at Battery
RemovalVBATT = 5.1V, gate driven high1590mA
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
NORMALIZED TO +25°C
MAX1879 toc02
TEMPERATURE (°C)
NORMALIZED REGULATION VOLTAGE
NORMALIZED BATTERY REGULATION
VOLTAGE vs. TEMPERATURE
NORMALIZED TO +25°C
MAX1879 toc03
VIN (V)
PRECHARGE CURRENT (mA)
PRECHARGE CURRENT
vs. INPUT VOLTAGE
VBATT = 0
VBATT = 2V
Typical Operating Characteristics
(VIN= CHG= +10V, VBATT= +4.2V, THERM = 10kΩto GND, TA= +25°C, unless otherwise noted.)
Pin Description
PINNAMEFUNCTIONINInput Voltage from Current-Limited Voltage Source (+22V max). Bypass to GND with a 0.1µF capacitor.GATEGate Drive for External PMOS Pass Element. The PMOS device should have a VGS threshold less than
2.5V. See Selecting External Components.CHG
Charge Status Indication. A CHG low indicates that the MAX1879 is charging a battery. CHG goes high
when the on/off duty cycle falls to 1/8, indicating that the battery is charged to approximately 95% of full
capacity. CHG is an open-drain current-limited N-channel MOSFET suitable for directly driving an LED.
Connect a pullup resistor to the logic supply to generate a logic-level signal. CHG blinks at 2Hz during the
Prequalification state (2.2V < VBATT < 2.5V) and during a temperature fault.TSELMinimum ON/OFF Pulse Width Selection (Table 2)ADJ
Battery Regulation Voltage Adjustment. Bypass to GND with a 1000pF capacitor. Connect a resistor from
ADJ to GND to reduce the nominal +4.200V regulation set point. See Adjusting the Battery Regulation
Voltage.GNDGround. See Layout Guidelines for information on system grounding. Connect the battery’s negative
terminal to GND.THERM
Thermistor Temperature-Sensor Input. Connect an NTC thermistor (10kΩ at +25°C) from THERM to GND to
allow prequalification of the cell temperature for fast-charge. Replace the thermistor with a 10kΩ resistor if
temperature sensing is not required.BATT
Cell Voltage Monitor Input, Precharge Current Output, and MAX1879 Power Source. Connect BATT to the
positive terminal of a single Li+ cell. Bypass BATT with a capacitor to ground (1.5µF per amp of charge
current).
MAX1879
Simple, Efficient, 1-Cell Li+ Pulse Charger
CURRENT-LIMITED
VOLTAGE SOURCE
(800mA)
PRECHARGE
CURRENT
(8mA)
TSEL
5mAGATE
CHG
BATT
1nF
ADJ2.2μF
RADJSINGLE
Li+
CELL
10kΩ
SEE TABLE 2
FOR PULSE-WIDTH
OPTIONS
TIMER
THERM
1.4V
HOT
QUAL
TEST
CURRENT
COLD
QUAL
TEST
CURRENT
30kHz
OSCILLATOR
REVERSE-CURRENT
PROTECTION DIODE
NTC THERMISTOR*
BATT REMOVED
STATE
MACHINE
1.4V
1:3
*OPTIONAL—REPLACE WITH 10kΩ RESISITOR IF NOT SENSING TEMPERATURE.
**RADJ = 410kΩ ±1% FOR 4.1V CELL; LEAVE OPEN FOR 4.2V CELL.
PFET
MAX1879
Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX1879EUA+ \|MAX1879EUA	MAXIM	N/a	250	avai	Simple, Efficient, 1-Cell Li+ Pulse Charger
MAX1879EUA+ \|MAX1879EUA	MAXIM/DALLAS	N/a	50	avai	Simple, Efficient, 1-Cell Li+ Pulse Charger
MAX1879EUA+T	MAXIM	N/a	2750	avai	Simple, Efficient, 1-Cell Li+ Pulse Charger