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MAX1508 Datasheet(PDF) 6 Page - Maxim Integrated Products

Part No. MAX1508
Description  Linear Li Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOKin 3mm x 3mm TDFN
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX1508 Datasheet(HTML) 6 Page - Maxim Integrated Products

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Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
6
_______________________________________________________________________________________
MAX1508
OUTPUT DRIVER,
CURRENT SENSE,
AND LOGIC
VLUVLO
VINOVLO
IN
ON
INOK
REFOK
VLOK
REFOK
REF
VL
N
LOGIC
TEMPERATURE
SENSOR
VREF
IREF
IN
ISET
VL
0.47
µF
BATT
EN (EN)
200k
GND
IN
100
°C
BATT
CHG
IN
N
ACOK
VI/O
MAX1508 AND
MAX1508Z ONLY
( ) ARE FOR MAX1508Y ONLY
CHG Charge Indicator Output
CHG is an open-drain current source for indicating
charge status. Table 1 describes the state of CHG dur-
ing different stages of operation.
CHG is a nominal 12mA current source suitable for dri-
ving a charge-indication LED. If the MAX1508 is used
in conjunction with a microprocessor, a pullup resistor
to the logic I/O voltage allows CHG to indicate charge
status to the µP instead of driving an LED.
Soft-Start
An analog soft-start algorithm activates when entering
fast-charge mode. When the prequalification state is
complete (VBATT exceeds +2.5V), the charging current
ramps up in 3ms to the full charging current. This
reduces the inrush current on the input supply. Since
the MAX1508Y and MAX1508Z do not have a prequali-
fication state, they automatically enter soft-start upon
activation.
Figure 1. Functional Diagram


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