MAX713ESE Maxim Integrated Products, MAX713ESE Datasheet - Page 14

• Manufacturer Part Number: MAX713ESE
• Description: Display Drivers 4 1-2 digit single c hip A-D converter wi
• Manufacturer: Maxim Integrated Products

NiCd/NiMH Battery
Fast-Charge Controllers
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).
The current-sense resistor, R
efficiency loss during battery use. The efficiency loss is
significant only if R
14
Figure 11. Sony CD Player AC Adapter AC-96N Load
Characteristic, 9VDC 600mA
Figure 13. 3 NiMH Cells Charged with MAX712
______________________________________________________________________________________
Linear-Mode, High Series Cell Count
5.0
4.9
4.8
4.7
4.6
4.4
4.3
4.2
4.5
11
10
9
8
6
5
7
0
0
200
V
Efficiency During Discharge
SENSE
TIME (MINUTES)
LOAD CURRENT (mA)
30
400
ΔV
HIGH PEAK
Δt
CUTOFF
LOW PEAK
T
is much greater than the
600
SENSE
60
120Hz
RIPPLE
800
MAX712/713
, causes a small
1000
90
40
38
36
34
32
28
26
24
30
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.
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.
Figure 12. Panasonic Modem AC Adapter KX-A11 Load
Characteristic, 12VDC 500mA
Figure 14. NiMH Cells Charged with MAX713
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
18
16
14
10
12
8
0
0
LOW PEAK
V
200
LOAD CURRENT (mA)
TIME (MINUTES)
30
ΔV
Δt
RIPPLE
120Hz
400
CUTOFF
T
HIGH PEAK
600
60
Status Outputs
MAX712/713
800
90
40
38
36
34
32
30
28
26
24