What the LT1076IQ#PBF is and where it fits
The Analog Devices LT1076IQ#PBF is a monolithic switching regulator that can be configured as a step-down (buck), step-up (boost), or flyback converter, delivering up to 2A at the switch. It operates from an 8V to 45V input rail and produces an adjustable output from 2.5V up to 35V. The 100kHz switching frequency is a deliberate choice — fast enough to keep inductor size reasonable for 2A designs, slow enough to avoid the tight layout and snubbing that 500kHz+ parts demand. The TO-263-6 (D²Pak) package with exposed tab handles the thermal load of continuous 2A switching without heroic heatsinking, provided the tab is soldered to a copper plane. This part is aimed at industrial power supplies, battery chargers, distributed power architectures, and isolated flyback rails where the input voltage is a regulated bus or a multi-cell battery stack.
2A switch current — what it means for your rail
The 2A switch current rating is the peak current the internal power switch can handle cycle-by-cycle. In a buck converter, that translates to about 1.2A to 1.5A continuous output at 12V in / 5V out, depending on inductor ripple and duty cycle. In a flyback, the 2A peak limits the output power to roughly 10W to 15W at typical telecom voltages. If your load demands more than that, you step up to an external-switch controller or a higher-current monolithic part like the LT1370 (6A switch). The 2A rating also sets the input capacitor ripple current requirement — plan for at least 1.5A RMS rating on the input cap.
100kHz switching — layout and inductor choices
The 100kHz switching period allows use of standard ferrite core inductors without saturation concerns.
Package and mounting — TO-263-6 (D²Pak)
The TO-263-6 (D²Pak) package has five leads plus the tab, which is the switch node and primary thermal path.
Lifecycle and sourcing posture
The LT1076IQ#PBF carries an Active product status and is ROHS3 compliant. That means it remains a viable choice for both new designs and production replenishment without near-term obsolescence risk.