Analog Devices ADN8831 Thermoelectric Cooler (TEC) Controller is a monolithic TEC controller with two integrated, zero drift, rail-to-rail comparators, and a unique PWM driver. This highly integrated device controls the TEC in a laser module used in optical communications systems. The PWM driver works with an analog driver to control external selected MOSFETs in an H-bridge. By sensing the thermal detector feedback from the TEC, ADN8831 can drive a TEC to settle the programmable temperature of a laser diode or a passive component attached to the TEC module. ADN8831 provides greater than 90% efficiency and lower than 1% ripple noise together to complete a TEC control function. Additionally, ADN8831 features system-supervising functions such as real temp monitoring, temp lock indication, current limit, switching frequency and phase changeability. ADN8831's wave lock input allows optical equipment designers to build a dual TEC control loop by using both thermistor and wavelockers. With a 5mm x 5mm tiny chip-scale package, optical equipment designers can save valuable board space in TEC temperature control, DWDM optical transceiver modules, optical fiber amplifiers, optical networking systems, and instruments requiring TEC temperature control.