MAX1968EUI datasheet(9/16 Pages) MAXIM

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Power Drivers for Peltier TEC Modules

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Pin Description

NAME

FUNCTION

VDD

Analog Supply Voltage Input

GND

Analog Ground. Connect to underside metal slug.

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.

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.

FREQ

Switching Frequency Select. High = 1MHz, Low = 500kHz.

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.

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.

OS1

Output Sense 1. OS1 senses one side of the differential TEC voltage. OS1 is a sense point, not a power

output.

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.

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.

COMP

Current Control-Loop Compensation. For most designs connect a 0.01µF capacitor from COMP to GND.

MAXIN

Maximum Negative TEC Current. Connect MAXIN to REF to set default negative current limit

-150mV / RSENSE. For MAX1969, connect MAXIN to GND.

MAXIP

Maximum Positive TEC Current. Connect MAXIP to REF to set default positive current limit +150mV / RSENSE.

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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