2V to 9V input range — what it means for your rail
The input range from 2V to 9V means this part can run from two alkaline cells, a single Li-ion, or a 5V or 9V regulated bus. The 2V minimum is the start-up voltage — below that the oscillator won't run. At the upper end, 9V is the absolute limit on the input pin; feeding it 12V will damage the switch. For battery-powered designs, the 2V floor lets you drain a 2-cell alkaline pack nearly to empty before the converter drops out. The 9V max also means you cannot use this part to regulate from a 12V rail down to 12V — that's a different topology.
Sourcing and availability
The ADP1109AN-12 is an active, in-production part from Analog Devices. It is sourced through independent distribution and quoted to order against an RFQ. Current pricing and availability are confirmed at quote time — no stock figures or lead-time numbers are published here. For BOM qualification, the active lifecycle means no imminent EOL risk, but the RoHS non-compliance may drive a future redesign if your compliance requirements tighten. If you need a RoHS-compliant boost converter in a similar DIP package, the ADP1111 family is a functional alternative (see FAQ).