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MAX1679

Maxim
Part Number MAX1679
Manufacturer Maxim
Description Single-Cell Li Battery Charger for Current-Limited Supply
Published May 6, 2005
Detailed Description 19-1545; Rev 0; 9/99 KIT ATION EVALU E L B AVAILA Single-Cell Li+ Battery Charger for Current-Limited Supply General D...
Datasheet PDF File MAX1679 PDF File

MAX1679
MAX1679

Overview
19-1545; Rev 0; 9/99 KIT ATION EVALU E L B AVAILA Single-Cell Li+ Battery Charger for Current-Limited Supply General Description Features o Simple Stand-Alone Application Circuit o Lowest Power Dissipation o 8-Pin µMAX Package Saves Space o No Inductor Required o 0.
75% Overall System Accuracy o Continuous Voltage and Temperature Protection o Safely Precharges Near-Dead Cells o Programmable Safety Timeout o Top-Off Charging to Achieve Full Battery Capacity o Automatic Power-Down when Power Source is Removed MAX1679 The MAX1679 battery charger for a single lithium-ion (Li+) cell comes in a space-saving 8-pin µMAX package.
This simple device, in conjunction with a current-limited wall cube and a PMOS transistor, allows safe and fast charging of a single Li+ cell.
The MAX1679 initiates charging in one of three ways: battery insertion, charger power-up, or external manipulation of the THERM pin.
Charging terminates when the average charging current falls to approximately 1% of the fast-charge current, or when the on-chip counter times out.
Key safety features include continuous voltage and temperature monitoring, a programmable charger timeout, and a 5mA 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 MAX1679 evaluation kit (MAX1679EVKIT) is available to help reduce design time.
Ordering Information PART MAX1679EUA TEMP.
RANGE -40°C to +85°C PIN-PACKAGE 8 µMAX Applications Single-Cell Li+ Portable Applications Self-Charging Battery Packs PDAs Cell Phones Cradle Chargers CURRENTLIMITED VOLTAGE SOURCE LED IN GATE BATT BATTERY IN GATE CHG TSEL 1 2 3 4 8 BATT THERM GND ADJ THERMISTOR 7 6 5 TIMER RANGE SELECT PFET Typical Operating Circuit Pin Configuration TOP VIEW CHG MAX1679 TSEL THERM GND ADJ MAX1679 µMAX __________________________...


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