L6610 is a control and housekeeping IC developed by BCD technology; it is a switching power supply for desktop computers or servers in the secondary side, in the presence of standard voltage rails, (+3.3 V, ± 5V, ± 12V) by the main converter and Auxiliary converters are generated by the power lines. Typical application circuits are shown on the front page. The main function of housekeeping is to control and supervise the main body and the voltages generated by the auxiliary converter: it senses these voltages, regulates the main controller and sends a feedback signal upon detection of undervoltage (UV), overvoltage (OV) or overcurrent (OC) conditions, report such failures and take appropriate action to protect the system. However, a special feature of this IC is its digital programming ability to enable precise trimming of the output voltage rail during production through software testing, without the use of any external discrete trimming components or the need for manual intervention on the PSU. It is also possible to program some monitoring functions and select how the UV and OC conditions are handled in the main inverter: whether to latch mode (messages are locked and released only by forced restart of the IC) or bounce mode (a try to restart the converter automatically after a 1 second wait). A key feature of this IC is its very low contribution external component count. In addition to the extensive use of on-board programmable switches to prevent the need for external trim components, ICs embed voltage references, error amplifiers, and housekeeping circuits that are often required.