Low-Cost, Multichemistry Battery-
Charger Building Block
MAX172
Typical Operating Characteristics (continued)
(Circuit of Figure 1a, V
= 20V, T = +25°C, unless otherwise noted.)
A
DCIN
OUTPUT V/I CHARACTERISTICS
BATT VOLTAGE ERROR vs. VCTL
0.050
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
V
V
= 0V
= 3.3V
VCTL
ICTL
CELL = 4
= 3.3V
0.045
0.040
0.035
0.030
0.025
0.020
0.015
0.010
0.005
0
CELL = 4
V
REFIN
NO LOAD
CELL = 3
CELL = 2
0
500 1000 1500 2000 2500 3000 3500 4000
BATT CURRENT (mA)
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
VCTL/REFIN (%)
CURRENT SETTING ERROR vs. ICTL
ICHG ERROR vs. BATT LOAD CURRENT
4.0
5
4
V
= 3.3V
V
V
= 0V
= 3.3V
REFIN
VCTL
ICTL
3.5
3.0
2.5
2.0
1.5
1.0
CELL = 4
3
2
1
0
V
> 2V
BATT
0.5
0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
ICTL/REFIN (%)
0
500 1000 1500 2000 2500 3000 3500 4000
BATT LOAD CURRENT (mA)
_______________________________________________________________________________________
9
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
