MAX712CPE Maxim Integrated Products, MAX712CPE Datasheet - Page 13

IC BATT FASTCHRG NICD/NIMH 16DIP

MAX712CPE

Manufacturer Part Number
MAX712CPE
Description
IC BATT FASTCHRG NICD/NIMH 16DIP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX712CPE

Function
Charge Management
Battery Type
Nickel Cadmium (NiCd), Nickel Metal-Hydride (NiMH)
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
16-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Figure 9a. Temperature Comparators
Figure 9b. Alternative Temperature Comparator Configuration
NOTE: FOR ABSOLUTE TEMPERATURE CHARGE CUTOFF, T2 AND T3 CAN BE
REPLACED BY STANDARD RESISTORS.
NOTE: FOR ABSOLUTE TEMPERATURE CHARGE CUTOFF, T2 AND T3 CAN BE
REPLACED BY STANDARD RESISTORS.
+2.0V
+2.0V
COLD
COLD
HOT
HOT
MAX712
MAX713
MAX712
MAX713
______________________________________________________________________________________
BATT-
TEMP
TLO
REF
THI
BATT-
TEMP
TLO
REF
THI
CONTACT WITH
R3
R4
0.022μF
IN THERMAL
BATTERY
TEMPERATURE
AMBIENT
T2
0.022μF
T1
0.022μF
TEMPERATURE
AMBIENT
R5
TEMPERATURE
TEMPERATURE
T3
AMBIENT
CONTACT WITH
R5
IN THERMAL
AMBIENT
BATTERY
0.022μF
T3
1μF
R3
R4
T1
T2
1μF
Fast-Charge Controllers
Some battery packs come with a temperature-detect-
ing thermistor connected to the battery pack’s negative
terminal. In this case, use the configuration shown in
Figure 9b. Thermistors T2 and T3 can be replaced by
standard resistors if absolute temperature charge cut-
off is acceptable. All resistance values in Figures 9a
and 9b should be chosen in the 10kΩ to 500kΩ range.
Figures 13 and 14 show the results of charging 3 AA,
1000mAh, NiMH batteries from Gold Peak (part no.
GP1000AAH, GP Batteries (619) 438-2202) at a 1A rate
using the MAX712 and MAX713, respectively. The
Typical Operating Circuit is used with Figure 9a’s
thermistor configuration .
DC IN = Sony AC-190 +9VDC at 800mA AC-DC adapter
PGM0 = V+, PGM1 = REF, PGM2 = REF, PGM3 = REF
R1 = 200Ω, R2 = 150Ω, R
C1 = 1µF, C2 = 0.01µF, C3 = 10µF, V
R3 = 10kΩ, R4 = 15kΩ
T1, T2 = part #14A1002 (Alpha Sensors: 858-549-4660) R5
omitted, T3 omitted, TLO = BATT-
Figure 10. Sony Radio AC Adapter AC-190 Load Characteristic,
9VDC 800mA
__________Applications Information
NiCd/NiMH Battery
11
10
9
8
7
6
0
200
Battery-Charging Examples
LOAD CURRENT (mA)
SENSE
400
LOW PEAK
HIGH PEAK
600
= 0.25Ω
120Hz RIPPLE
LIMIT
800
= REF
1000
13

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