1.2MHz Low-Cost,
High-Performance Chargers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, adapter = 19V, battery = 10V, ISET = 1.05V, V CTL = GND, T A = +25 ° C, unless otherwise noted.)
5.50
5.45
5.40
5.35
5.30
LDO LOAD REGULATION
5.50
5.45
5.40
5.35
5.30
LDO LINE REGULATION
4.205
4.204
4.203
4.202
4.201
4.200
4.199
4.198
4.197
4.196
4.195
V AA LOAD REGULATION
0
5
10
15
20
25
30
35
40
8
10
12
14
16
18
20
22
24
26
0
0.2
0.4
0.6
0.8
1.0
LDO CURRENT (mA)
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
HIGH-SIDE MOSFET OFF-TIME AND
V AA vs. TEMPERATURE
SWITCHING FREQUENCY vs. BATTERY VOLTAGE
4.2005
1.6
MAX17005 toc13
6
V IN = 20V
4.2000
4.1995
1.4
1.2
5
4.1990
1.0
SWITCHING FREQUENCY
4
4.1985
4.1980
4.1975
4.1970
4.1965
0.8
0.6
0.4
0.2
0
HIGH-SIDE MOSFET OFF-TIME
3
2
1
0
-60
-40
-20
0
20
40
60
80
100
0
2
4
6
8
10
12
14
16
18
ADAPTER CURRENT
TEMPERATURE ( ° C)
BATTERY VOLTAGE (V)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
vs. ADAPTER VOLTAGE
400
350
300
250
200
150
100
50
0
BATTERY LEAKAGE
ADAPTER REMOVAL
MAX17005 toc16
5.00V
5.00V
5.00V
0
5
10
15
20
0
2
4
6
8
10 12 14 16 18 20
200ms/div
ADAPTER VOLTAGE (V)
BATTERY VOLTAGE (V)
8
_______________________________________________________________________________________
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