MAX1978ETM+ Maxim Integrated Products, MAX1978ETM+ Datasheet - Page 10

• Manufacturer Part Number: MAX1978ETM+
• Description: IC CNTRLR INT TEMP 48TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1978ETM+

• Applications: Thermoelectric Cooler
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFN Exposed Pad
• Output Voltage Range: - 4.3 V to + 4.3 V
• Output Current: 6 A
• Input Voltage Range: 3 V to 5.5 V
• Input Current: 30 mA
• Power Dissipation: 2105 mW
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Ic Output Type: Current
• Sensing Accuracy Range: ± 1%
• Supply Current: 30mA
• Supply Voltage Range: 3V To 5.5V
• Sensor Case Style: QFN
• No. Of Pins: 48
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Temperature Sensing Range: -40°C To +85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Integrated Temperature
Controllers for Peltier Modules
10
28, 31, 33
27, 30
32, 34
PIN
23
24
36
37
38
39
40
41
44
45
46
47
48
—
______________________________________________________________________________________
PGND1
MAXIN
NAME
PV
COMP
MAXIP
AOUT
MAXV
FREQ
ITEC
AIN-
CTLI
V
OS1
LX1
REF
CS
EP
DD
DD
1
Undedicated Chopper-Stabilized Amplifier Inverting Input
Undedicated Chopper-Stabilized Amplifier Output
Power 1 Inputs. Must be same voltage as V
Bypass to PGND1 with a 10µF ceramic capacitor.
Inductor 1 Connection. Connect all LX1 pins together. Connect LX1 to LX2 when using the MAX1979.
Power Ground 1. Internal synchronous-rectifier ground connections. Connect all PGND pins together at
power ground plane.
Switching-Frequency Select. Low = 500kHz, high = 1MHz.
TEC Current Monitor Output. The ITEC output voltage is a function of the voltage across the TEC current-
sense resistor. V
Current-Control Loop Compensation. For most designs, connect a 10nF capacitor from COMP to GND.
Maximum Positive TEC Current. Connect MAXIP to REF to set default positive current limit +150mV/R
Maximum Negative TEC Current. Connect MAXIN to REF to set default negative current limit -150mV /
R
Maximum Bipolar TEC Voltage. Connect an external resistive divider from REF to GND to set the maximum
voltage across the TEC. The maximum TEC voltage is 4
Analog Supply Voltage Input. Bypass to GND with a 10µF ceramic capacitor.
TEC Current-Control Input. Sets differential current into the TEC. Center point is 1.50V (no TEC current).
Connect to INTOUT when using the thermal control loop. I
R
1.5V Reference Voltage Output. Bypass REF to GND with a 1µF ceramic capacitor.
Current-Sense Input. The current through the TEC is monitored between CS and OS1. The maximum TEC
current is given by 150mV/R
Output Sense 1. OS1 senses one side of the differential TEC voltage. OS1 is a sense point, not a power
output.
Exposed Pad. Solder evenly to the PCB ground plane to maximize thermal performance.
SENSE
SENSE
. Connect MAXIN to MAXIP when using the MAX1979.
). When (V
ITEC
CLTI
= 1.50V + (V
- V
REF
SENSE
) > 0, V
OS1
and is bipolar for the MAX1978. The MAX1979 TEC current is unipolar.
OS2
- V
> V
CS
DD
)
OS1
✕
. Connect all PV
8.
> V
FUNCTION
CS
.
✕
V
TEC
MAXV
Pin Description (continued)
DD
= (V
.
1 inputs together at the V
OS1
- V
CS
)/R
SENSE
= (V
CTLI
DD
power plane.
- 1.50)/(10
SENSE
✕
.