MAX1507 Maxim Integrated Products, MAX1507 Datasheet - Page 6

• Manufacturer Part Number: MAX1507
• Description: Linear Li Battery Charger
• Manufacturer: Maxim Integrated Products

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Linear Li+ Battery Charger with Integrated Pass FET
and Thermal Regulation in 3mm x 3mm Thin DFN
The MAX1507 charger uses voltage, current, and ther-
mal-control loops to charge a single Li+ cell and to pro-
tect the battery (Figure 1). When a Li+ battery with a
cell voltage below 2.5V is inserted, the MAX1507
charger enters the prequalification stage where it
precharges that cell with 10% of the user-programmed
fast-charge current. The CHG indicator output is driven
low (Figure 2) to indicate entry into the prequalification
Figure 1. Functional Diagram
6
_______________________________________________________________________________________
0.47µF
ISET
CHG
VL
IN
Detailed Description
N
IREF
REF
VL
IN
V
V
REFOK
INOVLO
LUVLO
IN
INOK
OUTPUT DRIVER,
CURRENT SENSE,
AND LOGIC
REFOK
V
LOK
state. Once the cell has passed 2.5V, the charger soft-
starts before it enters the fast-charge stage. The fast-
charge current level is programmed through a resistor
from ISET to ground. As the battery voltage approach-
es 4.2V, the charging current is reduced. If the battery
current drops to less than 10% of the fast-charging cur-
rent, the CHG indicator goes high impedance, signal-
ing the battery is fully charged. At this point the
MAX1507 enters a constant voltage-regulation mode to
ON
IN
BATT
LOGIC
TEMPERATURE
MAX1507
GND
SENSOR
V
REF
+90°C
+100°C
+130°C
200kΩ
TEMP
BATT
EN
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