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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REF
69.8kΩ
1%
AIN+
AOUT
80.6kΩ
1%
AIN-
20kΩ
1%
MAX1978
BFB-
MAX1979
x50
FB-
V
FB+
Figure 3. Thermistor Voltage Monitor
Design Procedure
Inductor Selection
Small surface-mount inductors are ideal for use with the
MAX1978/MAX1979. Select the output inductors so that
the LC resonant frequency of the inductance and the
output capacitance is less than 1/5 the selected switch-
ing frequency. For example, 3.0µH and 1µF have a res-
onance at 92kHz, which is adequate for 500kHz
operation.
1
=
f
LC
¡
2π
LC
where:
f
= resonant frequency of output filter.
LC
Capacitor Selection
Decouple each power-supply input (V
PV
2) with a 10µF ceramic capacitor close to the sup-
DD
ply pins. If long supply lines separate the source sup-
ply from the MAX1978/MAX1979, or if the source
supply has high output impedance, place an additional
______________________________________________________________________________________
Integrated Temperature
Controllers for Peltier Modules
22µF to 100µF ceramic capacitor between the V
power plane and power ground. Insufficient supply
bypassing can result in supply bounce and degraded
accuracy.
Include a compensation capacitor to ensure current-
105kΩ
power control-loop stability. Select the capacitor so that
1%
the unity-gain bandwidth of the current-control loop is
less than or equal to 10% the resonant frequency of the
output filter:
1µF
C
COMP
REF
where:
10kΩ
f
= unity-gain bandwidth frequency
BW
g
= loop transconductance, typically 100µA/V
m
C
= value of the compensation capacitor
COMP
R
= TEC series resistance
TEC
SETPOINT
R
= sense resistor
SENSE
Consider TEC parameters to guarantee a robust
design. These parameters include maximum positive
current, maximum negative current, and the maximum
voltage allowed across the TEC. These limits should be
used to set MAXIP, MAXIN, and MAXV voltages.
Setting Max Positive and Negative TEC Current
MAXIP and MAXIN set the maximum positive and nega-
tive TEC currents, respectively. The default current limit
is ±150mV / R
nected to REF. To set maximum limits other than the
defaults, connect a resistor-divider from REF to GND to
set V
MAXI_
V
is related to ITEC by the following equations:
MAXI_
where I
TECP(MAX)
and I
TECN(MAX)
Positive TEC current occurs when CS is less than OS1:
Filter Capacitors
, PV
1, and
DD
DD
I
TEC
I
TEC
Compensation Capacitor
⎛
⎞
⎛
×
g
24
R
m
SENSE
≥
⎟ ×
⎜
⎜
×
+
⎝
⎠
⎝
f
2π (
R
R
BW
SENSE
TEC
Setting Voltage and Current Limits
when MAXIP and MAXIN are con-
SENSE
. Use resistors in the 10kΩ to 100kΩ range.
V
= 10 (I
R

MAXIP
TECP(MAX)
SENSE
V
= 10 (I

R
MAXIN
TECN(MAX)
SENSE
is the maximum positive TEC current
is the maximum negative TEC current.
R
= CS - OS1 when I

SENSE
TEC

R
= OS1 - CS when I
SENSE
TEC
DD
⎞
⎟
⎠
)
)
)
< 0.
> 0.
15

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