Rainbow-electronics MAX8922L Manual do Utilizador descarregar pdf (Página 8)

MAX8922L

Power-OK Indicator (

POK

)

The MAX8922L contains an open-drain POK output that

goes low when V

is greater than V

UVLO

and lower than

OVP

and V

exceeds the battery voltage by 250mV.

Once charging has started, charging is sustained with

inputs as low as 3.5V, as long as the input voltage

remains above the battery voltage by at least 100mV.

POK status should be maintained even though the

charger is disabled by EN/SET. When V

> V

OVP

, POK

is high impedance.

30V Li+ Linear Battery Charger

with GSM Test Mode in 3mm x 2mm TDFN

8 _______________________________________________________________________________________

BAT

< 2.5V

BAT

< 2.2V V

BAT

> 2.5V

CHG

< I

TOP-OFF

STANDBY MODE

CHARGER = OFF

POK = LOW

CHG = HIGH IMPEDANCE

SHUTDOWN

CHARGER = OFF

POK = HIGH IMPEDANCE

CHG = HIGH IMPEDANCE

PREQUALIFICATION

PRECHARGE CURRENT

POK = LOW

CHG = LOW

FAST CHARGE

(PULSE PROGRAMMABLE)

100% CHARGER CURRENT

POK = LOW

CHG = LOW

FULL BATTERY

BAT

= 4.2V

POK = LOW

CHG = HIGH IMPEDANCE

ASYNCHRONOUS

FROM ANYWHERE

EN/SET = LOW

FULL BATTERY CONTINUES

TO REGULATE V

BAT

TO 4.2V

CHARGER LOOP DEFAULT IS OFF;

IF EN/SET = LOW UPON POK.

CHARGER LOOP

ACTIVATES AFTER 4ms

POR DEBOUNCE

PULSE 3

MODE DOES NOT HAVE

PRECHARGE STATE

UVLO

< V

OVP

AND

> V

BAT

+ 250mV

< V

UVLO

OR V

> V

OVP

OR V

BAT

+ 100mV > V

POK = (V

OVP

> V

UVLO

)

AND (V

- V

BAT

) > 250mV

CHG

> I

TOP-OFF

+ HYSTERESIS

< V

UVLO

OR V

> V

OVP

OR V

BAT

+ 100mV > V

ASYNCHRONOUS

FROM ANYWHERE

EN/SET

= HIGH > 4ms

Figure 2. Charger State Diagram

1 2 3 4 5 6 7 8 9 10 11 12 13 14

MAX8922L 1

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