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MAX1969EUI Datasheet(PDF) 9 Page - Maxim Integrated Products

Part # MAX1969EUI
Description  Power Drivers for Peltier TEC Modules
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1969EUI Datasheet(HTML) 9 Page - Maxim Integrated Products

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Power Drivers for Peltier TEC Modules
_______________________________________________________________________________________
9
Pin Description
PIN
NAME
FUNCTION
1
VDD
Analog Supply Voltage Input
2
GND
Analog Ground. Connect to underside metal slug.
3
CTLI
TEC Current Control Input. Sets differential current into the TEC. Center point is 1.50V (no TEC current).
The current is given by:
ITEC = (VOS1 - VCS) / RSENSE = (VCTLI - 1.50) / (10 x RSENSE). When (VCTLI - VREF) > 0, VOS2 > VOS1 > VCS.
4
REF
1.50V Reference Output. Bypass REF to GND with a 1µF ceramic capacitor.
5, 7
PGND2
Power Ground 2. Internal synchronous rectifier ground connections. Connect all PGND pins together at
power ground plane.
6, 8, 10
LX2
Inductor Connection. Connect all LX2 pins together. For MAX1969, connect LX1 and LX2 pins together.
9, 11
PVDD2
Power 2 Inputs. Must be same voltage as VDD. Connect all PVDD2 inputs together at the VDD power plane.
12
FREQ
Switching Frequency Select. High = 1MHz, Low = 500kHz.
13
ITEC
TEC Current Monitor Output. The ITEC output voltage is a function of the voltage across the TEC current-
sense resistor. VITEC = 1.50V + (VOS1 - VCS) x 8.
14
OS2
Output Sense 2. OS2 senses one side of the differential TEC voltage. OS2 is a sense point, not a power
output. For MAX1969, connect OS2 to GND.
15
OS1
Output Sense 1. OS1 senses one side of the differential TEC voltage. OS1 is a sense point, not a power
output.
16
CS
Current-Sense Input. The current through the TEC is monitored between CS and OS1. The maximum TEC
current is given by 150mV / RSENSE and is bipolar.
17
SHDN
Shutdown Control Input. Active-low shutdown control.
18, 20
PVDD1
Power 1 Inputs. Must be same voltage as VDD. Connect all PVDD1 inputs together at the VDD power plane.
19, 21, 23
LX1
Inductor Connection. Connect all LX1 pins together. For MAX1969, connect all LX1 and LX2 pins together.
22, 24
PGND1
Power Ground 1. Internal synchronous rectifier ground connections. Connect all PGND pins together at
power ground plane.
25
COMP
Current Control-Loop Compensation. For most designs connect a 0.01µF capacitor from COMP to GND.
26
MAXIN
Maximum Negative TEC Current. Connect MAXIN to REF to set default negative current limit
-150mV / RSENSE. For MAX1969, connect MAXIN to GND.
27
MAXIP
Maximum Positive TEC Current. Connect MAXIP to REF to set default positive current limit +150mV / RSENSE.
28
MAXV
Maximum Bipolar TEC Voltage. Connect an external resistive-divider from REF to GND to set the maximum
voltage. The maximum TEC voltage is 4 x VMAXV.


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