Datasheet

MAX8677C
1.5A Dual-Input USB/AC Adapter Charger
and Smart Power Selector
_______________________________________________________________________________________ 7
CHARGE PROFILE —1400mAh BATTERY
ADAPTER INPUT—1A CHARGE
MAX8677C toc18
V
BAT
(V)
I
BAT
(A)
100 15050
TIME (min)
2.5
3.5
3.0
5.0
5.5
4.5
4.0
6.0
0
2.0
1.5
1.0
0.5
0.6
1.0
0.8
1.2
0.4
0.2
0
0
V
BAT
I
BAT
CHARGE PROFILE —1400mAh BATTERY
USB INPUT—500mA CHARGE
MAX8677C toc19
V
BAT
(V)
I
BAT
(A)
120 140 160 1804020 1008060
TIME (min)
2.0
3.0
2.5
4.0
4.5
3.5
5.0
0
1.5
1.0
0.5
0.25
0.40
0.45
0.30
0.35
0.50
0.15
0.20
0.05
0.10
0
0
V
BAT
I
BAT
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
DC CONNECT WITH USB CONNECTED
(R
SYS
= 25Ω)
MAX8677C toc20
200μs/div
V
SYS
I
DC
I
USB
I
BAT
500mA/div
500mA/div
500mA/div
2V/div
C
DC
CHARGING
C
SYS
CHARGING
3.6V
3.68V
0A
0A
0A
4.35V
500mA
500mA
-335mA
-330mA
NEGATIVE BATTERY CURRENT
FLOWS INTO THE BATTERY
(CHARGING)
BATTERY
CHARGER
SOFT-START
DC CONNECT WITH NO USB
(R
SYS
= 25Ω)
MAX8677C toc21
400μs/div
V
BAT
V
SYS
I
DC
I
BAT
500mA/div
500mA/div
C
DC
CHARGING
C
SYS
CHARGING
3.6V
3.6V
0A
-1A
1.2A
120mA
4.35V
NEGATIVE BATTERY
CURRENT FLOWS INTO
THE BATTERY (CHARGING)
BATTERY
CHARGER
SOFT-START
DC DISCONNECT WITH NO USB
(R
SYS
= 25Ω)
MAX8677C toc22
20μs/div
V
SYS
I
DC
I
BAT
500mA/div
500mA/div
3.6V
0A
0.2A
-1A
1.2A
4.35V
NEGATIVE BATTERY
CURRENT FLOWS INTO
THE BATTERY (CHARGING)
USB CONNECT WITH NO DC
(R
SYS
= 20Ω)
MAX8677C toc23
200μs/div
V
USB
I
USB
V
SYS
I
BAT
500mA/div
500mA/div
5V/div
5V/div
10V/div
C
USB
CHARGING
C
SYS
CHARGING
0V
4.3V
0A
-300mA
500mA
155mA
3V
3V
0V
0V
3.6V
4.35V
5V
BATTERY
CHARGER SOFT-START
V
UOK
V
CHG