Datasheet

MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
______________________________________________________________________________________ 13
OS2
OS1
CS
LX1
LX2
COMP
ITEC
GNDCTLI
50mΩ
100kΩ50kΩ
100kΩ
100kΩ
1μF
1μF
1μF
1μF
1μF
1μF
V
DD
PV
DD
1
PV
DD
2
PGND1
PGND2
REF
MAXIP
FREQ
MAXIN
MAXV
MAX1968
3V TO
5.5V
TO REF
NTC
THERMISTOR
0.01μF
10kΩ
R
THERM
3.3μH
SHDN
3.3μH
10μF
ON
OFF
V
DD
U3A
U3B
510kΩ
100kΩ 10kΩ
U2
TO REF
10μF
0.022μF
240kΩ
10kΩ
TEMPERATURE
SET POINT*
*SEE FIGURE 2
FOR TEMPERATURE
SET POINT SET BY A DAC
0.1μF
0.1μF
V
DD
10kΩ
1μF
MAX4477
MAX4477
MAX4475
Figure 1. Typical Application Circuit for MAX1968. Circuit is configured for both cooling and heating with an NTC thermistor. Current
flowing from OS2 to OS1 is cooling.