MAX1679EUA+ Maxim Integrated Products, MAX1679EUA+ Datasheet - Page 5

• Manufacturer Part Number: MAX1679EUA+
• Description: IC BATT CHRGR 1CELL LITH 8-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX1679EUA+

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 5 V ~ 22 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(V IN = V
PIN
1.0200
1.0150
1.0100
1.0050
1.0000
0.9950
0.9900
1
2
3
4
5
6
7
8
-40
CHG
NORMALIZED TO +25°C
THERM
NAME
GATE
TSEL
BATT
-20
CHG
GND
ADJ
= +10V, V BATT = +4.2V, THERM = 10kΩ to GND, T A = +25°C, unless otherwise noted.)
IN
AMBIENT TEMPERATURE
TIMER PERIOD vs.
0
TEMPERATURE (°C)
_______________________________________________________________________________________
20
Input Voltage from Current-Limited Voltage Source (+22V max). Bypass to GND with a 0.1µF capacitor. The
cell charging current is set by the current limit of the external power supply.
Gate Drive for External PMOS Pass Element. The PMOS device should have a V
less. See Selecting External Components .
Charge Status Indication. CHG is an open-drain, current-limited N-channel MOSFET suitable for directly dri-
ving an LED. Connect a pull-up resistor to BATT to generate a logic-level signal. See Table 2 for CHG out-
put states.
Maximum Total Charge-Time Selection. See Table 3 for timer options.
Battery Regulation Voltage Adjustment. Bypass to GND with a 1000pF capacitor. Connect a resistor from
ADJ to GND to reduce the nominal +4.200V regulation setpoint. See Adjusting the Battery Regulation
Voltage .
Ground. See Layout Guidelines for information on system grounding. Connect the battery’s negative termi-
nal to GND.
Thermistor Temperature-Sensor Input. Connect a thermistor from THERM to GND to prequalify the cell tem-
perature for fast-charge. Drive THERM high (> +1.4V) during Done or Fault states to reset the MAX1679 and
reinitiate the charging sequence. Replace the thermistor with a 10kΩ resistor if temperature sensing is not
required.
Cell Voltage Monitor Input, Trickle-Charge Output, and MAX1679 Power Source. Connect BATT to the posi-
tive terminal of a single Li+ cell. Bypass BATT with a capacitor to ground (1.5µF per amp of charge current).
40
60
80
100
Single-Cell Li+ Battery Charger
1.0015
1.0010
1.0005
1.0000
0.9995
0.9990
0.9985
0.9980
0.9975
NORMALIZED BATT REGULATION VOLTAGE
-40
NORMALIZED TO +25°C
-20
for Current-Limited Supply
vs. TEMPERATURE
0
TEMPERATURE (°C)
20
Typical Operating Characteristics
FUNCTION
40
60
80
100
6.0
5.8
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
5
GS
PRECHARGE CURRENT
Pin Description
10
vs. INPUT VOLTAGE
threshold of 2.5V or
V
IN
15
(V)
V
V
V
BATT
BATT
BATT
20
= 0V
= 4.1V
= 2V
25
5