MAX1879 Maxim, MAX1879 Datasheet
MAX1879
Manufacturer Part Number
MAX1879
Description
Simple / Efficient / 1-Cell Li+ Pulse Charger
Manufacturer
Maxim
Datasheet
1.MAX1879.pdf
(11 pages)
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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.
19-2061; Rev 0; 5/01
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
TOP VIEW
Single-Cell Li+ Powered Portables
Self-Charging Battery Packs
PDAs
Cell Phones
Cradle Chargers
GATE
TSEL
Simple, Efficient, 1-Cell Li+ Pulse Charger
CHG
IN
________________________________________________________________ Maxim Integrated Products
1
2
4
3
General Description
MAX1879
µMAX
Pin Configuration
Applications
6
8
7
5
BATT
THERM
GND
ADJ
o Simple Design Minimizes Heat
o Low Component Count, No Inductor
o Battery-Full Indicator
o 0.75% Accurate Battery Regulation
o 1.5µA (max) Battery Current Drain with Wall Cube
o Restart Charging at 4.0V
o Continuous Overvoltage and Overtemperature
o Safely Precharges Near-Dead Cells
o Automatic Power-Down when Power Source is
o Charges 1 Cell from as Low as 4.5V
o Pin-Compatible Upgrade to MAX1679
Removed
Protection
Removed
MAX1879EUA
CURRENT-
AC WALL
ADAPTER
LIMITED
PART
SELECT INPUT
PULSE WIDTH
LED
THERMISTOR
Typical Operating Circuit
CHG
TSEL
TEMP. RANGE
-40°C to +85°C
THERM
Ordering Information
IN
MAX1879
ADJ
GATE
BATT
GND
PIN-PACKAGE
8-µMAX
Features
1-CELL
Li+
BATTERY
1
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