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MAX1679EUA+T

P1-P3P4-P6P7-P9P10-P12
MAX1679
Single-Cell Li+ Battery Charger
for Current-Limited Supply
4 _______________________________________________________________________________________
THERM Sense Voltage Trip
Point
1.358 1.442 V
GATE Drive Current at Battery
Removal
20 90 mAV
BATT
= 5.1V, gate driven high
GATE Source/Sink Current 60 140 µAV
IN
= 10V, V
GATE
= 8V
PARAMETER SYMBOL MIN MAX UNITS
THERM Sense Current (for cold
qualification)
47.3 50.3 µA
THERM Sense Current (for hot
qualification)
342 363 µA
CHG Output Sink Current
46mA
V
CHG
= 1.0V, CHG = low
CHG Output Leakage Current
-1 +1 µA
V
CHG
= 22V, CHG = high
Timer Accuracy -15 +15 %See Table 3
IN Input Current, Done State I
IN
700 µAV
BATT
= 4.25V, V
IN
= 22V
CONDITIONS
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
CHG
= +10V, V
BATT
= +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnected, THERM = 10kΩ to GND, T
A
= -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, V
IN
may be as low as 2.5V.
Note 2: BATT Input Current is the supply current to the device. When V
IN
is removed, the MAX1679 shuts down and the input current
is less than 1µA, even if there is an external R
ADJ
resistor (ADJ to GND).
Single-Cell Li+ Battery Charger
for Current-Limited Supply
MAX1679
_______________________________________________________________________________________ 5
0.9900
1.0000
0.9950
1.0100
1.0050
1.0150
1.0200
-40 20 40-20 0 60 80 100
TIMER PERIOD vs.
AMBIENT TEMPERATURE
MAX1679 toc01
TEMPERATURE (°C)
TIMER PERIOD
NORMALIZED TO +25°C
Typical Operating Characteristics
(V
IN
= V
CHG
= +10V, V
BATT
= +4.2V, THERM = 10kΩ to GND, T
A
= +25°C, unless otherwise noted.)
4.0
4.8
4.4
4.6
4.2
5.2
5.0
5.8
5.6
5.4
6.0
51510 20 25
PRECHARGE CURRENT
vs. INPUT VOLTAGE
MAX1679 toc03
V
IN
(V)
PRECHARGE CURRENT (mA)
V
BATT
= 4.1V
V
BATT
= 2V
V
BATT
= 0V
0.9975
0.9985
0.9980
0.9995
0.9990
1.0010
1.0005
1.0000
1.0015
-40 0-20 20 40 60 80 100
NORMALIZED BATT REGULATION VOLTAGE
vs. TEMPERATURE
MAX1679 toc02
TEMPERATURE (°C)
BATT REGULATION VOLTAGE
NORMALIZED TO +25°C
Pin Description
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
.
ADJ5
Ground. See
Layout Guidelines
for information on system grounding. Connect the battery’s negative termi-
nal to GND.
GND6
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.
THERM7
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).
BATT8
Maximum Total Charge-Time Selection. See Table 3 for timer options.TSEL4
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.
CHG
3
PIN
Gate Drive for External PMOS Pass Element. The PMOS device should have a V
GS
threshold of 2.5V or
less. See
Selecting External Components
.
GATE2
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.
IN1
FUNCTIONNAME
6 _______________________________________________________________________________________
MAX1679
Single-Cell Li+ Battery Charger
for Current-Limited Supply
CURRENT-LIMITED
VOLTAGE SOURCE
(800mA)
TRICKLE
CHARGE
(5mA)
TSEL
5mA
IN GATE
CHG
BATT
1nF
ADJ
2.2µF
R
ADJ
SINGLE
Li+
CELL
10kΩ
SEE TABLE 3
FOR TIMEOUT
OPTIONS
TIMER
THERM
1.4V
HOT
QUAL
TEST
CURRENT
COLD
QUAL
TEST
CURRENT
30kHz
OSCILLATOR
REVERSE-CURRENT
PROTECTION DIODE
*
**
NTC THERMISTOR*
BATT REMOVED
STATE
MACHINE
MAX1679
1.4V
5V
1:3
*OPTIONAL
**R
ADJ
= 410kΩ ±1% FOR 4.1V CELL; LEAVE OPEN FOR 4.2V CELL.
PFET
Figure 1. Functional Diagram
P1-P3P4-P6P7-P9P10-P12

MAX1679EUA+T

Mfr. #:
Buy MAX1679EUA+T
Manufacturer:
Maxim Integrated
Description:
Battery Management Battery Charger Current-Limited Sply
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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