MAX1968EUI Maxim Integrated Products, MAX1968EUI Datasheet - Page 9

• Manufacturer Part Number: MAX1968EUI
• Description: Other Power Management
• Manufacturer: Maxim Integrated Products

Specifications of MAX1968EUI

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

19, 21, 23
6, 8, 10
18, 20
22, 24
9, 11
PIN
5, 7
12
13
14
15
16
17
25
26
27
28
—
1
2
3
4
PGND2
PGND1
MAXIN
PV
PV
MAXIP
NAME
COMP
SHDN
MAXV
FREQ
GND
CTLI
ITEC
OS2
OS1
V
REF
LX2
LX1
CS
EP
DD
DD
DD
2
1
_______________________________________________________________________________________
Analog Supply Voltage Input
Analog Ground
TEC Current Control Input. Sets differential current into the TEC. Center point is 1.50V (no TEC current).
The current is given by:
I
1.50V Reference Output. Bypass REF to GND with a 1µF ceramic capacitor.
Power Ground 2. Internal synchronous rectifier ground connections. Connect all PGND pins together at
power ground plane.
Inductor Connection. Connect all LX2 pins together. For MAX1969, connect LX1 and LX2 pins together.
Power 2 Inputs. Must be same voltage as V
Switching Frequency Select. High = 1MHz, Low = 500kHz.
TEC Current Monitor Output. The ITEC output voltage is a function of the voltage across the TEC current-
sense resistor. V
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.
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 / R
Shutdown Control Input. Active-low shutdown control.
Power 1 Inputs. Must be same voltage as V
Inductor Connection. Connect all LX1 pins together. For MAX1969, connect all LX1 and LX2 pins together.
Power Ground 1. Internal synchronous rectifier ground connections. Connect all PGND pins together at
power ground plane.
Current Control-Loop Compensation. For most designs connect a 0.01µF capacitor from COMP to GND.
Maximum Negative TEC Current. Connect MAXIN to REF to set default negative current limit
-150mV / R
M axi m um P osi ti ve TE C C ur r ent. C onnect M AX IP to RE F to set d efaul t p osi ti ve cur r ent l i m i t + 150m V / R
(See the Setting Max Positive and Negative TEC Current section).
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 V
Exposed Pad. Internally connected to GND. Connect to a large ground plane to maximize thermal
performance.
TEC
Power Drivers for Peltier TEC Modules
= (V
OS1
SENSE
- V
CS
ITEC
. For MAX1969, connect MAXIN to MAXIP.
) / R
= 1.50V + (V
SENSE
= (V
SENSE
CTLI
OS1
and is bipolar.
- 1.50) / (10 x R
- V
CS
DD
DD
MAXV
) x 8.
. Connect all PV
. Connect all PV
.
FUNCTION
SENSE
). When (V
DD
DD
2 inputs together at the V
1 inputs together at the V
CTLI
- V
REF
) > 0, V
Pin Description
OS2
DD
DD
> V
power plane.
power plane.
OS1
S E N S E
> V
CS
.
.
9