Rainbow-electronics MAX8903A Manuale Utente Scaricare il pdf (Pagina 8)

MAX8903A

2A 1-Cell Li+ DC-DC Charger for USB*

and Adapter Power

8 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

= +25°C, unless otherwise noted.)

200

s/div

USB RESUME

5V/div

MAX8903A toc28

500mA/div

2V/div

500mA/div

475mA

-475mA

3.6V

3.8V

BATTERY

CHARGER

SOFT-START

USB

CHARGING

USUS

USB

SYS

BAT

400μs/div

DC CONNECT WITH NO USB

SYS

= 25Ω)

2V/div

MAX8903A toc22

5V/div

1A/div

3.6V

3.84V

3.6V

3.44V

CHARGING

SYS

CHARGING

850mA

-1A

BATTERY

CHARGER

SOFT-START

144mA

SYS

BAT

-I

BAT

= CHARGING

40μs/div

DC DISCONNECT WITH NO USB

SYS

= 25Ω)

2V/div

MAX8903A toc23

5V/div

1A/div

3.6V

3.68V

850mA

-1A

144mA

SYS

BAT

3.6V

-I

BAT

= CHARGING

100

s/div

SYS LOAD TRANSIENT

(0 TO 1A)

50mV/div

AC COUPLED

MAX8903A toc24

500mA/div

SYS

400

s/div

USB CONNECT WITH NO DC

SYS

= 25Ω)

2V/div

MAX8903A toc25

5V/div

500mA/div

3.6V

USB

CHARGING

BATTERY

CHARGER

SOFT-START

144mA

SYS

USB

BAT

3.5V

3.75V

475mA

-330mA

100μs/div

USB DISCONNECT WITH NO DC

SYS

= 25Ω)

2V/div

MAX8903A toc26

5V/div

500mA/div

3.6V

475mA

SYS

USB

BAT

144mA

-330mA

200

s/div

USB SUSPEND

5V/div

MAX8903A toc27

500mA/div

2V/div

500mA/div

475mA

-475mA

USUS

USB

SYS

BAT

3.7V

DC CONNECT WITH

USB CONNECTED (R

SYS

= 25Ω)

MAX8903A toc21

200

s/div

SYS

USB

BAT

2V/div

500mA/div

3.6V

347mA

-I

BAT

= CHARGING

475mA

-335mA

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

MAX8903A 1

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