Targeted for a different set of applications, the LTM8052 can source and sink between 5A to -5A of output current to maintain a regulated output voltage. Maximum source and sink current is determined by the voltage at the control pin. The source/sink feature is suited for bi-directional Peltier driving, charge balancing, and back-bias applications. A bi-directional Peltier drive circuit provides heating or cooling depending on the direction of current flow. The temperature difference between the two sides is determined by the voltage and current provided by two LTM8052s. In the example above the Peltier cools a laser cavity. If heating is desired, simply reverse the voltage across the Peltier by modifying R1 and adjust the current limit as desired. To reduce system thermal rise and improve energy efficiency, the LTM8052 recycles the returned current back into the input rail rather than dissipating the energy into the ground plane.