MAX1968/MAX1969

Power Drivers for Peltier TEC Modules

Maxim Integrated | 13

www.maximintegrated.com

OS2

OS1

CS

LX1

LX2

COMP

ITEC

GND

CTLI

50m

Ω

100k

Ω

50k

Ω

100k

Ω

100k

Ω

1

μF

1

μF

1

μF

1

μF

1

μF

1

μF

PGND1

PGND2

REF

MAXIP

FREQ

MAXIN

MAXV

MAX1968

3V TO

5.5V

TO REF

NTC

THERMISTOR

0.01

μF

10k

Ω

3.3

μH

SHDN

3.3

μH

10

μF

ON

OFF

U3A

U3B

510k

Ω

100k

Ω

10k

Ω

U2

TO REF

10

μF

0.022

μF

240k

Ω

10k

Ω

TEMPERATURE

SET POINT*

*SEE FIGURE 2

FOR TEMPERATURE

SET POINT SET BY A DAC

0.1

μF

0.1

μF

10k

Ω

1

μF

MAX4477

MAX4477

MAX4475

Figure 1. Typical Application Circuit for MAX1968. Circuit is configured for both cooling and heating with an NTC thermistor. Current

flowing from OS2 to OS1 is cooling.