MAX8903A View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX8903A Datasheet PDF : 20 Pages
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2A 1-Cell Li+ DC-DC Charger for USB*
and Adapter Power
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
SYS VOLTAGE
vs. DC VOLTAGE
5.0
4.5
4.0
3.5
3.0
VDC RISING
2.5
2.0
1.5
VDC FALLING
1.0
0.5
0
0 2 4 6 8 10 12 14 16 18
DC VOLTAGE (V)
VL VOLTAGE vs. DC VOLTAGE
6
5
4
3
2
1
0
0 2 4 6 8 10 12 14 16 18
DC VOLTAGE (V)
SYS VOLTAGE
vs. SYS OUTPUT CURRENT, DC INPUT
4.50
4.40
VDC = 5.75V
4.30
4.20
4.10
USB AND DC UNCONNECTED
4.00
VBATT = 4V
3.90
3.80
0
0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5
SYS OUTPUT CURRENT (A)
CHARGE PROFILE—1400mAh BATTERY
ADAPTER INPUT—1A CHARGE
6.0
1.2 MAX8903A toc17
5.5
5.0
IDC SET TO 1A
IBAT SET TO 2A VBAT
1.0
4.5
4.0
0.8
3.5
3.0
0.6
2.5
2.0
IBAT
0.4
1.5
1.0
0.2
0.5
0
0.0
0 20 40 60 80 100 120 140
TIME (min)
SYS VOLTAGE
vs. SYS OUTPUT CURRENT, USB INPUT
4.400
4.395
VUSB = 5V
4.390
4.385
4.380
4.375
4.370
4.365
4.360
4.355
0 50 100 150 200 250 300 350 400 450 500
SYS OUTPUT CURRENT (mA)
CHARGE PROFILE—1400mAh BATTERY
USB INPUT—500mA CHARGE
5.0
MAX8903A toc18 0.500
4.5
0.450
4.0
0.400
3.5
3.0
VBAT
0.350
0.300
2.5
IBAT
0.250
2.0
0.200
1.5
0.150
1.0
0.100
0.5
IUSB SET TO 500mA
IBAT SET TO 2A
0
0.050
0
0 20 40 60 80 100 120 140 160 180 200
TIME (min)
DC SWITCHING WAVEFORMS—LIGHT LOAD
MAX8903A toc19
VOUT
20mV/div
AC-COUPLED
DC SWITCHING
WAVEFORMS—HEAVY LOAD
MAX8903A toc20
20mV/div
VOUT
AC-COUPLED
VLX
5V/div
0V
VLX
5V/div
0V
ILX
ILX
500mA/div
500mA/div
0A
RSYS = 44Ω
RSYS = 5Ω
0A
200ns/div
200ns/div
_______________________________________________________________________________________ 7
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