Datasheet
V
DD
STEP RESPONSE
MAX1968 toc18
10ms/div
1A
0V
I
TEC
20mA/div
V
DD
2V/div
CTLI STEP RESPONSE
MAX1968 toc17
1ms/div
I
TEC
2A/div
1.5V
0A
V
CTLI
1V/div
STARTUP AND SHUTDOWN WAVEFORMS
MAX1968 toc16
2ms/div
0V
0A
0A
I
TEC
500mA/div
V
CTLI
= 2V
I
DD
200mA/div
V
SHDN
5V/div
REFERENCE LOAD REGULATION
V
DD
= 5V
LOAD CURRENT (mA)
REFERENCE VOLTAGE CHANGE (mV)
0.80.60.2 0.40-0.2
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
-0.4 1.0
SINK
SOURCE
MAX1968 toc15
REFERENCE LOAD REGULATION
V
DD
= 3.3V
MAX1968 toc14
LOAD CURRENT (mA)
REFERENCE VOLTAGE CHANGE (mV)
0.80.60.2 0.40-0.2
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
-1.4
-0.4 1.0
SINK
SOURCE
REFERENCE VOLTAGE CHANGE
vs. TEMPERATURE
MAX1968 toc13
TEMPERATURE (°C)
REFERENCE VOLTAGE CHANGE (mV)
804020-20
-4
-2
-1
0
1
2
-5
-40
-3
060
REFERENCE VOLTAGE CHANGE
vs. V
DD
MAX1968 toc12
V
DD
(V)
REFERENCE VOLTAGE CHANGE (mV)
5.04.54.03.5
-3.0
-2.5
-1.5
-1.0
0
0.5
1.0
-3.5
3.0 5.5
-2.0
-0.5
SWITCHING FREQUENCY CHANGE
vs. V
DD
MAX1968 toc11
V
DD
(V)
SWITCHING FREQUENCY CHANGE (kHz)
5.04.54.03.5
5
10
15
20
25
30
35
0
3.0 5.5
FREQ = 500kHz
SWITCHING FREQUENCY
vs. TEMPERATURE
MAX1968 toc10
TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)
806020 400-20
470
490
510
530
550
570
590
610
630
650
450
-40
FREQ = 500kHz
V
CTLI
= 1.5V
R
TEC
= 1Ω
MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(V
DD
= 5V, V
CTLI
= 1V, V
FREQ
= GND, R
LOAD
= 1Ω, circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)