MAX712CSE データシートの表示（PDF） - Maxim Integrated
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MAX712CSE Datasheet PDF : 17 Pages
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NiCd/NiMH Battery
Fast-Charge Controllers
Linear-Mode, High Series Cell Count
The absolute maximum voltage rating for the BATT+ pin
is higher when the MAX712/MAX713 are powered on. If
more than 11 cells are used in the battery, the BATT+
input voltage must be limited by external circuitry when
DC IN is not applied (Figure 15).
Efficiency During Discharge
The current-sense resistor, RSENSE, causes a small
efficiency loss during battery use. The efficiency loss is
significant only if RSENSE is much greater than the
battery stack’s internal resistance. The circuit in Figure
16 can be used to shunt the sense resistor whenever
power is removed from the charger.
Status Outputs
Figure 17 shows a circuit that can be used to indicate
charger status with logic levels. Figure 18 shows a
circuit that can be used to drive LEDs for power and
charger status.
11
10
HIGH PEAK
9
8
120Hz
7
RIPPLE
LOW PEAK
6
5
0
200 400 600 800 1000
LOAD CURRENT (mA)
Figure 11. Sony CD Player AC Adapter AC-96N Load
Characteristic, 9VDC 600mA
MAX712/713
5.0
40
4.9
ΔV
Δt
CUTOFF
38
4.8
36
4.7
34
V
4.6
32
4.5
30
T
4.4
28
4.3
4.2
0
30
60
TIME (MINUTES)
26
24
90
Figure 13. 3 NiMH Cells Charged with MAX712
18
16
14
HIGH PEAK
12
LOW PEAK
10
8
0
120Hz
RIPPLE
200 400
600
800
LOAD CURRENT (mA)
Figure 12. Panasonic Modem AC Adapter KX-A11 Load
Characteristic, 12VDC 500mA
5.0
4.9
ΔV
Δt
CUTOFF
4.8
4.7
V
4.6
4.5
T
4.4
MAX712/713
40
38
36
34
32
30
28
4.3
4.2
0
30
60
TIME (MINUTES)
26
24
90
Figure 14. NiMH Cells Charged with MAX713
14 ______________________________________________________________________________________
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