1.5A Dual-Input USB/AC Adapter Charger

and Smart Power Selector

8

_______________________________________________________________________________________

USB DISCONNECT WITH NO DC

Ω)

MAX8677A toc24

200

µs/div

500mA/div

1A/div

5V/div

5V/div

5V/div

10V/div

0A

-300mA

475mA

120mA

3V

3V

0V

0V

3.6V

4.3V

5V

USB SUSPEND

MAX8677A toc25

200

µs/div

500mA/div

500mA/div

5V/div

5V/div

2V/div

-500mA

0A

0A

3V

0V

0V

4V

4.6V

500mA

5V

USB RESUME

MAX8677A toc26

200

µs/div

500mA/div

500mA/div

5V/div

5V/div

2V/div

0A

0A

3V

3V

0V

0V

4V

4.6V

-500mA

500mA

BATTERY

CHARGER

SOFT-START

Pin Description

PIN

NAME

FUNCTION

1

DONE

Charge Done Output. Active-low, open-drain output pulls low when the charger enters the DONE state. No

charging current flows when DONE is low. See Figure 5.

2, 3

DC

DC Power Input. DC is capable of delivering up to 2A to SYS. DC supports both AC adapter and USB inputs. The

together externally.

4

CEN

Charger Enable Input. Connect CEN to GND to enable battery charging when a valid source is connected at DC

or USB. Connect to VL or drive high with a logic signal to disable battery charging.

5

PEN1

by PEN2 and USUS. See Table 2.

Typical Operating Characteristics (continued)