MAX1879EUA-T Maxim Integrated Products, MAX1879EUA-T Datasheet
MAX1879EUA-T
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MAX1879EUA-T Summary of contents
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... Battery Current Drain with Wall Cube Removed o Restart Charging at 4.0V o Continuous Overvoltage and Overtemperature Protection o Safely Precharges Near-Dead Cells o Automatic Power-Down when Power Source is Removed o Charges 1 Cell from as Low as 4.5V o Pin-Compatible Upgrade to MAX1679 Applications PART MAX1879EUA CURRENT- LIMITED AC WALL ADAPTER 8 BATT 7 THERM 6 GND 5 ...
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Simple, Efficient, 1-Cell Li+ Pulse Charger ABSOLUTE MAXIMUM RATINGS 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 ...
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Simple, Efficient, 1-Cell Li+ Pulse Charger ELECTRICAL CHARACTERISTICS (continued +10V +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnected, THERM = 10kΩ to GND, T CHG IN BATT +85°C, unless otherwise noted. Typical ...
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Simple, Efficient, 1-Cell Li+ Pulse Charger ELECTRICAL CHARACTERISTICS (continued +10V +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnected, THERM = 10kΩ to GND, CHG IN BATT -40°C to +85°C, ...
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Simple, Efficient, 1-Cell Li+ Pulse Charger = CHG = +10V +4.2V, THERM = 10kΩ to GND BATT NORMALIZED TIMER PERIOD vs. AMBIENT TEMPERATURE 1.020 NORMALIZED TO +25°C 1.015 1.010 1.005 1.000 0.995 0.990 0.985 0.980 ...
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Simple, Efficient, 1-Cell Li+ Pulse Charger CURRENT-LIMITED VOLTAGE SOURCE (800mA) REVERSE-CURRENT PROTECTION DIODE MAX1879 PRECHARGE CURRENT (8mA) TSEL STATE MACHINE SEE TABLE 2 FOR PULSE-WIDTH OPTIONS TIMER 30kHz OSCILLATOR * OPTIONAL—REPLACE WITH 10kΩ RESISITOR IF NOT SENSING TEMPERATURE ...
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Simple, Efficient, 1-Cell Li+ Pulse Charger CHARGING POWER REMOVED (FROM ANY STATE) 8.0mA PRECHARGE: ON PMOS FET: OFF LED: 50% DUTY CYCLE, 2Hz TEMPERATURE NOT OK CHARGE QUALIFICATION V < 2.5V BATT PMOS FET: OFF LED: ON TEMPERATURE NOT OK ...
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Simple, Efficient, 1-Cell Li+ Pulse Charger Detailed Description Initiating a Charge Cycle The MAX1879 initiates fast-charge upon insertion of a battery or application of an external power source (cur- rent-limited AC wall adapter). After charge completion, charging restarts if the ...
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Simple, Efficient, 1-Cell Li+ Pulse Charger from 4.2V, and/or a reverse-current-protection diode can be added in line at the source. If the input is shorted, the MAX1879 will not allow current to flow from BATT back through IN to the ...
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Simple, Efficient, 1-Cell Li+ Pulse Charger with current limiting. In most applications, this will be a small “wall cube” switching converter with an output voltage limit of about 5V or 6V, which is specified as “current-limited” or “constant current.” The ...
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... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...