Rainbow-electronics MAX1508 Manual de usuario descargar pdf (Pagina 6)

MAX1508

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

LUVLO

INOVLO

INOK

REFOK

LOK

REFOK

REF

LOGIC

TEMPERATURE

SENSOR

REF

IREF

ISET

0.47µF

BATT

200kΩ

GND

100°C

BATT

CHG

ACOK

VI/O

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 (V

BATT

exceeds +2.5V), the charging current

ramps up in 3ms to the full charging current. This

reduces the inrush current on the input supply.

Figure 1. Functional Diagram

1 2 3 4 5 6 7 8 9 10 11

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Rainbow-electronics MAX1508 Manual de usuario Pagina 6

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