ZHCSD59F June 2012 – November 2017 LM34926
PRODUCTION DATA.
The LM34926 step-down switching regulator features all the functions needed to implement a low-cost, efficient, isolated bias supply. This high-voltage regulator contains 100-V, N-channel buck and synchronous switches, is easy to implement, and is provided in thermally enhanced SO PowerPAD-8 and WSON-8 packages. The regulator operation is based on a constant on-time control scheme using an on-time inversely proportional to VIN. This control scheme does not require loop compensation. Current limit is implemented with forced off-time inversely proportional to VOUT. This scheme ensures short circuit protection while providing minimum foldback. The simplified block diagram of the LM34926 device is shown in Functional Block Diagram.
The LM34926 device can be applied in numerous applications to efficiently regulate down higher voltages. This regulator is well suited for 48-V telecom and automotive power bus ranges. Protection features include: thermal shutdown, undervoltage lockout, minimum forced off-time, and an intelligent current limit.