Datasheet

MAX8903A–E/G/H/J/N/Y
2A 1-Cell Li+ DC-DC Chargers
for USB and Adapter Power
10
Maxim Integrated
400µs/div
DC CONNECT WITH NO USB
(R
SYS
= 25Ω)
2V/div
MAX8903A toc22
5V/div
1A/div
1A/div
3.6V
3.84V
3.6V
3.44V
C
DC
CHARGING
C
SYS
CHARGING
850mA
-1A
BATTERY
CHARGER
SOFT-START
144mA
0A
V
SYS
V
BAT
I
DC
I
BAT
-I
BAT
= CHARGING
40
µ
s/div
DC DISCONNECT WITH NO USB
(R
SYS
= 25Ω)
2V/div
MAX8903A toc23
5V/div
1A/div
1A/div
3.6V
3.68V
850mA
-1A
144mA
0A
V
SYS
V
BAT
I
DC
I
BAT
3.6V
-I
BAT
= CHARGING
MAX8903A/C/D/H SYS LOAD TRANSIENT
MAX8903A toc24a
0A
20mV/div
AC-COUPLED
500mA/div
V
SYS
4.400V
4.360V
1A
0A
I
SYS
100µs/div
MAX8903A
V
DC
= 10.5V
L = 2.2µH
C
SYS
= 10µF
R
IDC
= 3kI (2A)
DCM = HIGH
CEN = 1
MAX8903B/E SYS LOAD TRANSIENT
MAX8903A toc24b
0A
20mV/div
500mA/div
V
SYS
4.325V
4.305V
1A
0A
I
SYS
100µs/div
MAX8903B
V
DC
= 10.5V
L = 2.2µH
C
SYS
= 22µF
R
IDC
= 3kI (2A)
DCM = HIGH
CEN = 1
MAX8903G SYS LOAD TRANSIENT
MAX8903A toc24c
0A
50mV/div
500mA/div
V
SYS
0A
1A
4.325V
4.305V
I
SYS
100µs/div
V
DC
= 9V
L = 2.2µH
C
SYS
= 22µF
R
IDC
= 3kI (2A)
DCM = 1
CEN = 1
400
µ
s/div
USB CONNECT WITH NO DC
(R
SYS
= 25Ω)
2V/div
MAX8903A toc25
5V/div
500mA/div
500mA/div
3.6V
C
USB
CHARGING
BATTERY
CHARGER
SOFT-START
144mA
V
SYS
V
USB
I
USB
I
BAT
3.5V
3.75V
5V
475mA
-330mA
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)