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MAX1969EUI Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1969EUI Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 16 page 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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