Datasheet

MAX8677C
1.5A Dual-Input USB/AC Adapter Charger
and Smart Power Selector
8 _______________________________________________________________________________________
USB DISCONNECT WITH NO DC
(R
SYS
= 20Ω)
MAX8677C toc24
200μs/div
V
USB
I
USB
V
SYS
I
BAT
500mA/div
1A/div
5V/div
5V/div
10V/div
0A
-300mA
475mA
120mA
3V
3V
0V
0V
3.6V
3.7V
5V
V
UOK
V
CHG
USB SUSPEND
MAX8677C toc25
200μs/div
V
USUS
I
USB
V
SYS
I
BAT
500mA/div
500mA/div
5V/div
5V/div
-500mA
0A
0A
3V
0V
0V
3.6V
3.7V
500mA
3V
V
CHG
USB RESUME
MAX8677C toc26
200μs/div
V
USUS
I
USB
V
SYS
I
BAT
500mA/div
500mA/div
5V/div
5V/div
0A
0A
3V
3V
0V
0V
3.6V
4.35V
3.7V
-500mA
500mA
V
CHG
C
USB
CHARGING
BATTERY
CHARGER SOFT-START
Pin Description
PIN NAME FUNCTION
1 PREQ
Charge Prequal Output. Active-low, open-drain output pulls low when the charger enters the prequal state.
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
DC current limit is set with PEN1, PEN2, USUS, and R
PSET
. See Table 2. Both DC pins must be connected
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
DC Input Limit Control. If PEN1 is high, the DC input current limit is 3000/R
PSET
. If PEN1 is low, the DC limit is set
by PEN2 and USUS. See Table 2.
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)