MAX1969EUI+ Maxim Integrated Products, MAX1969EUI+ Datasheet - Page 15

• Manufacturer Part Number: MAX1969EUI+
• Description: IC DRVR POWER 28-TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1969EUI+

• Applications: Thermoelectric Cooler
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP Exposed Pad, 28-eTSSOP, 28-HTSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

TRANSISTOR COUNT: 2959
PROCESS: BiCMOS
The MAX1968/MAX1969 typically drive a thermoelectric
cooler inside a thermal control loop. TEC drive polarity
and power are regulated based on temperature informa-
tion read from a thermistor, or other temperature-mea-
suring device to maintain a stable control temperature.
Temperature stability of 0.01°C can be achieved with
carefully selected external components.
There are numerous ways to implement the thermal
loop. Figures 1 and 2 show a design that employs preci-
sion op amps, along with a DAC or potentiometer to set
the control temperature. The loop may also be imple-
mented digitally, using a precision A/D to read the ther-
mistor or other temperature sensor, a microcontroller to
implement the control algorithm, and a DAC (or filtered
PWM signal) to send the appropriate signal to the
MAX1968/MAX1969 CTLI input. Regardless of the form
taken by the thermal control circuitry, all designs are
similar in that they read temperature, compare it to a
set-point signal, and then send an error-correcting sig-
nal to the MAX1968/MAX1969 that moves the tempera-
ture in the appropriate direction.
Applications Information
______________________________________________________________________________________
Power Drivers for Peltier TEC Modules
Chip Information
Pages changed at Rev 2: 1, 9, 15, 16
TOP VIEW
NOTE: GND IS CONNECTED TO THE UNDERSIDE METAL SLUG.
PGND2
PGND2
PV
PV
FREQ
GND
CTLI
ITEC
OS2
V
REF
LX2
LX2
DD
LX2
DD 2
DD
2
10
11
12
13
14
1
2
3
4
5
6
7
8
9
TSSOP-EP
MAX1968
MAX1969
Pin Configuration
Revision History
28
27
26
25
24
23
22
21
20
19
18
17
16
15
MAXV
MAXIP
MAXIN
COMP
PGND1
LX1
PGND1
LX1
PV
LX1
PV
SHDN
CS
OS1
DD 1
DD 1
15