Datasheet

MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
14 ______________________________________________________________________________________
V
DD
LX1
LX2
GND
3V TO
5.5V
PV
DD
1
PV
DD
2
PGND1
PGND2
REF
MAXIP
MAXIN
MAXV
CS
OS1
OS2
SHDN
ITEC
COMP
FREQ
CTLI
ON
OFF
MAX1969
TO REF
V
DD
U3A
U3B
U2
to REF
510k Ω
100kΩ 10kΩ
1μF
50k
Ω 100k Ω
2.5μH
25mΩ
100k
Ω
100k Ω
4.7μF
10μF
R
THERM
10kΩ
0.01μF
0.1μF
10k Ω 1μF
V
DD
240k Ω
TEMPERATURE
SET POINT*
*SEE FIGURE 1 FOR TEMPERATURE
SET POINT SET BY A POTENTIOMETER
DAC
V
DD
DAC
INPUTS
1μF
1μF
1μF
0.1μF
0.022μF
10μF
MAX4475
MAX4477
MAX4477
MAX5144
NTC
THERMISTOR
Figure 2. Typical Application Circuit for MAX1969. MAXIN sets the maximum TEC current. Circuit configured for cooling with NTC
thermistor. Current always flows from CS to OS2.