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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1679 Datasheet

Single-Cell Li Battery Charger for Current-Limited Supply

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MAX1679 pdf
19-1545; Rev 0; 9/99
EVAALVUAAILTAIOBNLEKIT
Single-Cell Li+ Battery Charger
for Current-Limited Supply
General Description
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 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-
able to help reduce design time.
Applications
Single-Cell Li+ Portable Applications
Self-Charging Battery Packs
PDAs
Cell Phones
Cradle Chargers
Pin Configuration
TOP VIEW
IN 1
GATE 2
CHG 3
TSEL 4
MAX1679
µMAX
8 BATT
7 THERM
6 GND
5 ADJ
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
PART
MAX1679EUA
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
8 µMAX
Typical Operating Circuit
CURRENT-
LIMITED
VOLTAGE
SOURCE
LED
TIMER
RANGE
SELECT
PFET
IN GATE
CHG BATT
MAX1679
TSEL GND
THERM ADJ
THERMISTOR
BATTERY
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1679 Datasheet

Single-Cell Li Battery Charger for Current-Limited Supply

No Preview Available !

MAX1679 pdf
Single-Cell Li+ Battery Charger
for Current-Limited Supply
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, 10sec) ............................ +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 = V CHG = +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
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage (Note 1)
VIN External PMOS FET off
5 22 V
Input Voltage for Removable
Battery (Note 1)
VIN External PMOS FET off
6 22 V
Undervoltage Lockout Trip Point
VBATT rising
2.1 2.2 2.3
V
Undervoltage Lockout Trip-Point
Hysteresis
VBATT falling
60 mV
Fast-Charge Qualification
Threshold
VBATT rising, transition from precharge to full
current
2.425 2.500 2.575
V
Fast-Charge Restart Threshold
Precharge Source Current
BATT Regulation Voltage
BATT Regulation Adjust Range
ADJ Source Impedance
ADJ Output Voltage
Battery Removal Detection
Threshold
Battery Removal Detection
Threshold Hysteresis
BATT Input Current (Note 2)
BATT Input Current, Fast-
Charge State
BATT Input Current, Done State
IN Input Current, Fast-Charge
State
IN Input Current, Done State
Timer Accuracy
CHG Output Leakage Current
IBATT
IBATT
IIN
IIN
VBATT falling, transition from DONE to
PREQUAL state (Figure 2)
VBATT = 2V
No load on ADJ
VBATT rising
VBATT falling
VIN VBATT -0.3V
VBATT = 4V
VBATT = 4.25V
VBATT = 4V, VIN = 4V
VBATT = 4.25V, VIN = 22V
See Table 3
V CHG = 22V, CHG = high
3.783 3.89 4.00
4
4.1685
4.0
9.8
1.393
5
4.2000
10
1.400
6
4.2315
4.2
10.2
1.407
4.875 5.0 5.125
125
0.1 1
900 1500
500 1000
30 100
250 600
-10 +10
-1 +1
V
mA
V
V
k
V
V
%
mV
µA
µA
µA
µA
µA
%
µA
2 _______________________________________________________________________________________


Part Number MAX1679
Description Single-Cell Li Battery Charger for Current-Limited Supply
Maker Maxim
Total Page 12 Pages
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