Typical operating characteristics – Rainbow Electronics MAX1555 User Manual
Page 4
MAX1551/MAX1555
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
4
_______________________________________________________________________________________
Typical Operating Characteristics
(V
DC
= 5V, V
USB
= 0, I
BAT
= 0, C
BAT
= 1µF, T
A
= +25
°C, unless otherwise noted.)
CHARGE CURRENT
vs. DC VOLTAGE HEADROOM
MAX1551/55 toc01
DC VOLTAGE HEADROOM (V
DC
- V
BAT
) (V)
CHARGE CURRENT (mA)
0.3
0.2
0.1
0
50
100
150
200
250
300
-50
0
0.5
0.4
V
BAT
= 3.8V, V
DC
FALLING
CHARGE CURRENT
vs. USB VOLTAGE HEADROOM
MAX1551/55 toc02
USB VOLTAGE HEADROOM (V
USB
- V
BAT
) (V)
CHARGE CURRENT (mA)
0.4
0.3
0.2
0.1
0
20
40
60
80
100
-20
0
0.5
V
DC
= 0, V
BAT
= 3.8V, V
USB
FALLING
DC CHARGE CURRENT
vs. BATTERY VOLTAGE
MAX1551/55 toc03
BATTERY VOLTAGE (V)
DC CHARGE CURRENT (mA)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
50
100
150
200
250
300
-50
0
4.5
USB CHARGE CURRENT
vs. BATTERY VOLTAGE
MAX1551/55 toc04
BATTERY VOLTAGE (V)
USB CHARGE CURRENT (mA)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
20
40
60
80
100
-20
0
4.5
DC CHARGE CURRENT
vs. AMBIENT TEMPERATURE
MAX1551/55 toc05
TEMPERATURE (
°C)
DC CHARGE CURRENT (mA)
75
65
55
45
35
0
50
100
150
200
250
300
-50
25
85
V
BAT
= 3.8V, V
DC
= 5V
THERMAL LIMIT ACTIVATED
BATTERY TERMINATION VOLTAGE
vs. TEMPERATURE
MAx1551/55 toc06
TEMPERATURE (
°C)
BATTERY TERMINATION VOLTAGE (V)
35
60
10
-15
4.19
4.20
4.21
4.22
4.18
-40
85
BAT OPEN
OFF-BATTERY LEAKAGE CURRENT
vs. DC INPUT VOLTAGE
MAX1551/55 toc07
DC OR USB INPUT VOLTAGE (V)
OFF-BATTERY LEAKAGE CURRENT (
µ
A)
4
3
2
1
0.5
1.0
1.5
2.0
2.5
0
0
5
V
DC
= 0, SWEEPING USB
0 TO 5V OR V
USB
= 0,
SWEEPING DC 0 TO 5V
V
BAT
= 4.2V
USB-TO-DC TRANSITION WAVEFORM
MAX1551/55 toc08
400ms/div
V
USB
5V/div
V
DC
5V/div
0A
0V
0V
0V
BATTERY
CURRENT
200mA/div
V
POK
2V/div