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MAX1679EUA-MAX1679EUA+
Single-Cell Li Battery Charger for Current-Limited Supply
General DescriptionThe 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 charg-
ing of a single Li+ cell.
The MAX1679 initiates charging in one of three ways:
battery insertion, charger power-up, or external manip-
ulation 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 time-
out, 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 avail-
ableto help reduce design time.
ApplicationsSingle-Cell Li+ Portable Applications
Self-Charging Battery Packs
PDAs
Cell Phones
Cradle Chargers
FeaturesSimple Stand-Alone Application CircuitLowest Power Dissipation8-Pin μMAX Package Saves Space No Inductor Required0.75% Overall System AccuracyContinuous Voltage and Temperature ProtectionSafely Precharges Near-Dead CellsProgrammable Safety TimeoutTop-Off Charging to Achieve Full Battery CapacityAutomatic Power-Down when Power Source is
Removed
MAX1679
Single-Cell Li+ Battery Charger
for Current-Limited Supplyypical Operating Circuit
Pin Configuration
Ordering Information
MAX1679
Single-Cell Li+ Battery Charger
for Current-Limited Supply
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.)
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, 10sec)............................+300°C
ABSOLUTE MAXIMUM RATINGSStresses 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.
Single-Cell Li+ Battery Charger
for Current-Limited Supply
MAX1679
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 GND, TA
= -40°C
to +85°C, unless otherwise noted.)
MAX1679
Single-Cell Li+ Battery Charger
for Current-Limited Supply
ELECTRICAL CHARACTERISTICS (continued)(VIN= VCHG= +10V, VBATT= +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnected, THERM = 10kΩto GND, TA
= -40°C
to +85°C, unless otherwise noted.)
Note 1:The input voltage range is specified with the external PFET off. When charging, the PFET turns on and the input voltage
(the output voltage of the constant-current power source) drops to very near the battery voltage. When the PFET is on, VIN
may be as low as 2.5V.
Note 2:BATT Input Current is the supply current to the device. When VINis removed, the MAX1679 shuts down and the input current
is less than 1μA, even if there is an external RADJresistor (ADJ to GND).
Single-Cell Li+ Battery Charger
for Current-Limited Supply
MAX1679TIMER PERIOD vs.
AMBIENT TEMPERATURE
MAX1679 toc01
TEMPERATURE (°C)
TIMER PERIOD
Typical Operating Characteristics(VIN= VCHG= +10V, VBATT= +4.2V, THERM = 10kΩto GND, TA= +25°C, unless otherwise noted.)
Pin Description
MAX1679
Single-Cell Li+ Battery Charger
for Current-Limited SupplyFigure 1. Functional Diagram
