Datasheet

Integrated Temperature
Controllers for Peltier Modules
ELECTRICAL CHARACTERISTICS
(V
DD
= PV
DD
1 = PV
DD
2 = V
SHDN
= 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 5)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
Input Supply Range V
DD
3 5.5 V
V
DD
= 5V, I
TEC
= 0 to ±3A,
V
OUT
= V
OS1
-V
OS2
(MAX1978)
-4.3 +4.3
V
DD
= 5V, I
TEC
= 0 to 6A,
V
OUT
= V
OS1
(MAX1979)
4.3
V
DD
= 3V, I
TEC
= 0 to ±3A,
V
OUT
= V
OS1
- V
OS2
(MAX1978)
-2.3 +2.3
Output Voltage Range V
OUT
V
DD
= 3V, I
TEC
= 0 to 6A,
V
OUT
= V
OS1
(MAX1979)
2.3
V
MAX1978 ±3
Maximum TEC Current I
TEC
(
MAX
)
MAX1979 6
A
Reference Voltage V
REF
V
DD
= 3V to 5.5V, I
REF
= 150µA 1.475 1.515 V
Reference Load Regulation ∆V
REF
V
DD
= 3V to 5.5V,
I
REF
= 10µA to -1mA
5mV
V
MAXI_
= V
REF
135 160
V
OS1
< V
CS
V
MAXI_
= V
REF
/3 40 60
V
MAXI_
= V
REF
135 160
Current-Sense Threshold
V
OS1
> V
CS
V
MAXI_
= V
REF
/3 40 60
mV
V
DD
= 5V 50
No-Load Supply Current
I
DD(NO
LOAD) V
DD
= 3.3V 30
mA
Shutdown Supply Current I
DD-SD
SHDN = GND, V
DD
= 5V (Note 3) 3 mA
V
DD
rising 2.4 2.8
UVLO Threshold V
UVLO
V
DD
falling 2.25 2.75
V
FREQ = GND 450 650
Switching Frequency Internal
Oscillator
f
SW-INT
FREQ = V
DD
800 1200
kHz
OS1, OS2, CS Input Current
I
OS1
, I
OS2
,
I
CS
0 or V
DD
-100 +100 µA
SHDN, FREQ Input Current
I
SHDN
,
I
F REQ
0 or V
DD
-5 +5 µA
SHDN, FREQ Input Low Voltage V
IL
V
DD
= 3V to 5.5V
0.25
✕
V
DD
V
SHDN, FREQ Input High Voltage V
IH
V
DD
= 3V to 5.5V
0.75
✕
V
DD
V
MAX1978/MAX1979
Maxim Integrated
5