Datasheet

MAX8903A–E/G/H/J/N/Y
2A 1-Cell Li+ DC-DC Chargers
for USB and Adapter Power
9
Maxim Integrated
MAX8903A/B/C/G/H
CHARGE PROFILE—1400mAh BATTERY
USB INPUT—500mA CHARGE
TIME (min)
V
BAT
(V)
I
BAT
(A)
180160120 14040 60 80 10020
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0
0 200
V
BAT
I
BAT
MAX8903A toc18
MAX8903A/MAX8903B/MAX8903C
I
USB
SET TO 500mA
I
BAT
SET TO 2A
200ns/div
MAX8903A/B/C/D/E/H/J/N/Y DC SWITCHING
WAVEFORMS—LIGHT LOAD
20mV/div
AC-COUPLED
MAX8903A toc19
500mA/div
0A
5V/div
0V
V
OUT
V
LX
I
LX
R
SYS
= 44
Ω
MAX8903G DC SWITCHING
WAVEFORMS—LIGHT LOAD
MAX8903A toc19a
10V/div
0A
50mV/div
AC-COUPLED
0V
1A/div
V
SYS
V
LX
I
LX
1µs/div
V
DC
= 9V, L = 2.2µH
C
SYS
= 22µF,
R
SYS
= 44I
MAX8903A/B/C/D/E/H/J/N/Y DC SWITCHING
WAVEFORMS—HEAVY LOAD
MAX8903A toc20
200ns/div
V
LX
V
OUT
I
LX
5V/div
0V
20mV/div
AC-COUPLED
500mA/div
0A
R
SYS
= 5Ω
MAX8903G DC SWITCHING
WAVEFORMS—HEAVY LOAD
MAX8903A toc20a
10V/div
0A
50mV/div
AC-COUPLED
0V
1A/div
V
SYS
V
LX
I
LX
1µs/div
V
DC
= 9V, L = 2.2µH
C
SYS
= 22µF, R
SYS
= 5I
CEN = 1
DC CONNECT WITH
USB CONNECTED (R
SYS
= 25Ω)
MAX8903A toc21
200
µ
s/div
I
DC
V
SYS
I
USB
I
BAT
2V/div
500mA/div
500mA/div
500mA/div
0A
3.6V
347mA
-I
BAT
= CHARGING
475mA
-335mA
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)