IC CNTRLR INT TEMP 48TQFN

 

MAX1978ETM+

Manufacturer Part NumberMAX1978ETM+
DescriptionIC CNTRLR INT TEMP 48TQFN
ManufacturerMaxim Integrated Products
MAX1978ETM+ datasheets

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Specifications of MAX1978ETM+

ApplicationsThermoelectric CoolerVoltage - Supply3 V ~ 5.5 V
Operating Temperature-40°C ~ 85°CMounting TypeSurface Mount
Package / Case48-TQFN Exposed PadOutput Voltage Range- 4.3 V to + 4.3 V
Output Current6 AInput Voltage Range3 V to 5.5 V
Input Current30 mAPower Dissipation2105 mW
Operating Temperature Range- 40 C to + 85 CMounting StyleSMD/SMT
Ic Output TypeCurrentSensing Accuracy Range± 1%
Supply Current30mASupply Voltage Range3V To 5.5V
Sensor Case StyleQFNNo. Of Pins48
Filter TerminalsSMDRohs CompliantYes
Temperature Sensing Range-40°C To +85°CLead Free Status / RoHS StatusLead free / RoHS Compliant
Current - Supply-  
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Integrated Temperature
Controllers for Peltier Modules
Detailed Description
The power stage of the MAX1978/MAX1979
thermoelectric cooler (TEC) temperature controllers
consists of two switching buck regulators that operate
together to directly control TEC current. This configura-
tion creates a differential voltage across the TEC, allow-
ing bidirectional TEC current for controlled cooling and
heating. Controlled cooling and heating allow accurate
TEC temperature control within the tight tolerances of
laser driver specifications.
The voltage at CTLI directly sets the TEC current. The
internal thermal-control loop drives CTLI to regulate
10µF
0.01µF
UNDERTEMP
ALARM
OVERTEMP
ALARM
DC CURRENT
MONITOR
20kΩ
1%
80.6kΩ
1µF
THERMISTOR
VOLTAGE
MONITOR
REF
69.8kΩ
1%
105kΩ
1%
Figure 1. MAX1978 Typical Application Circuit. Circuit is configured for both cooling and heating the NTC thermistor. Current flowing
from OS2 and OS1 is cooling.
12
______________________________________________________________________________________
TEC temperature. The on-chip thermal-control circuitry
can be configured to achieve temperature control sta-
Power Stage
bility of 0.001°C. Figure 1 shows a typical TEC thermal-
control circuit.
Switching regulators like those used in the
MAX1978/MAX1979 inherently create ripple voltage on
each common-mode output. The regulators in the
MAX1978 switch in phase and provide complementary
in-phase duty cycles, so ripple waveforms at the differ-
ential TEC output are greatly reduced. This feature sup-
presses ripple currents and electrical noise at the TEC
to prevent interference with the laser diode while mini-
mizing output capacitor filter size.
V
REF
DD
10µF
10µF
1µF
V
PV
1
PV
2
REF MAXV MAXIN MAXIP
SHDN
DD
DD
DD
COMP
UT
OT
ITEC
MAX1978
BFB-
AIN-
AOUT
AIN+
CTLI
FREQ
GND
PGND2 PGND1
INTOUT
INT-
10µF
0.47µF
100kΩ
0.047µF
1MΩ
Ripple Cancellation
3µH
LX1
CS
0.068Ω
OS1
4.7µF
TEC
OS2
3µH
LX2
1µF
REF
FB-
DIFOUT FB+
10kΩ
100kΩ
20kΩ
1µF
THERMAL
FEEDBACK

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