Datasheet

MAX8677C
1.5A Dual-Input USB/AC Adapter Charger
and Smart Power Selector
______________________________________________________________________________________ 11
MAX8677C
PREQ
1
FLT
R
PU
560kΩ
PREQUAL
C
DC
4.7μF
ADAPTER
24
TO VL
R
PU
3X 560kΩ
FAULT
OUTPUT
USB PWR
OK
DC PWR
OK
TO SYSTEM
LOAD
CHARGE
INDICATOR
1-CELL
Li+
VBUS
TO VL
560kΩ
USB
DC
2
UOK
23
DC
3
DOK
22
CEN
4
OFF
CHARGE ON
SYS
21
PEN1
5
SYS
20
PEN2
6
CHG
19
PSET
R
PSET
R
ISET
10kΩ
7
BAT
18
VL
8
BAT
17
GND
9
USB
16
CT
10
USB
15
ISET
11
TSET
14
THM
12
USUS
13
C
SYS
10μF
C
BAT
4.7μF
C
USB
4.7μF
GND
USB SUSPEND
TO VL: I
TERM
= 15%
OPEN: I
TERM
= 10%
GND: I
TERM
= 5%
500mA
C
L
0.1μF
C
T
0.068μF
NTC
10kΩ
+25°C
100mA
Figure 2. Typical Application Circuit Using Separate DC and USB Connectors
for two-input or single-input operation. Figure 2 is the
typical application circuit using separate DC and USB
connectors. Figure 3 is the typical application circuit
using a Mini 5-style connector or other DC/USB com-
mon connector.
In addition to charging the battery, the MAX8677C also
supplies power to the system through the SYS output.
The charging current is also provided from SYS so that
the set input current limit controls the total SYS current,
which is the sum of the system load current and the
battery-charging current. SYS is powered from either
the DC input pin or the USB input pin. If both the DC
and USB are connected, DC takes precedence.