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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1879 Datasheet

Simple / Efficient / 1-Cell Li+ Pulse Charger

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MAX1879 pdf
19-2061;
Rev
0; 5/01
EVALUATION
KIT
AVAILABLE
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
Features
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
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
PART
MAX1879EUA
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
8-µMAX
TOP VIEW
Pin Configuration
IN 1
GATE 2
CHG 3
TSEL 4
MAX1879
8 BATT
7 THERM
6 GND
5 ADJ
µMAX
Typical Operating Circuit
CURRENT-
LIMITED
AC WALL
ADAPTER
LED
PULSE WIDTH
SELECT INPUT
IN GATE
CHG BATT
MAX1879
TSEL GND
THERM
ADJ
THERMISTOR
1-CELL
Li+
BATTERY
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1879 Datasheet

Simple / Efficient / 1-Cell Li+ Pulse Charger

No Preview Available !

MAX1879 pdf
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
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
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.
ELECTRICAL CHARACTERISTICS
(VIN = VCHG = +10V, VBATT = +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnected, THERM = 10kto GND, TA = 0°C to
+85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Input Voltage (Note 1)
Undervoltage Lockout Trip Point
SYMBOL
VIN
CONDITIONS
External PMOS FET off
BATT rising
MIN TYP MAX UNITS
4.4 22 V
2.1 2.2 2.3 V
Undervoltage Lockout Trip-Point
Hysteresis
BATT falling
60 mV
Fast-Charge Qualification
Threshold
BATT rising, transition from precharge to
full current
2.425
2.5 2.575
V
Fast-Charge Restart Threshold
BATT falling, transition from Done to
Prequalification state (Note 2)
3.92 4.00 4.08
V
Fast-Charge Reset Threshold
Delay
(Note 3)
1 ms
Precharge Source Current
BATT Regulation Voltage
BATT Regulation Adjust Range
ADJ Source Impedance
ADJ Output Voltage
VBATT = 2V
No load on ADJ
5
4.1685
4.0
9.8
1.393
8
4.2000
10
1.400
12
4.2315
4.2
10.2
1.407
mA
V
V
k
V
BATT Removal Detection
Threshold
BATT rising
4.875 5 5.125 V
BATT Removal Detection
Threshold Hysteresis
BATT falling
125 mV
BATT Input Current (Note 4)
BATT Input Current, Fast-Charge
State
IBATT
VIN VBATT - 0.3V
VBATT = 4.0V
0.1 1.5 µA
900 1500 µA
BATT Input Current, Done State
IN Input Current, Fast-Charge
State
IBATT
IIN
VBATT = 4.25V, VIN present
VBATT = 4.0V, VIN = 4.0V
85 200 µA
50 500 µA
IN Input Current, Done State
Timer Accuracy
CHG Output Leakage Current
CHG Output Sink Current
IIN VBATT = 4.25V, VIN = 22V
VCHG = 22V, CHG = high
VCHG = 1.0V, CHG = low
700 1200 µA
-10 +10 %
-1 +1 µA
4 5 6 mA
2 _______________________________________________________________________________________


Part Number MAX1879
Description Simple / Efficient / 1-Cell Li+ Pulse Charger
Maker Maxim
Total Page 11 Pages
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