AP1501-3.3

@@ -0,0 +1,45 @@+# AP1501-3.3++**UMW** · DC-DC Converters · TO-263-5++AP1501-3.3 from UMW, in a TO-263-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VIN | power_in | Positive input supply for the IC switching regulator (4.5V to 40V operating, 45V abs max). A suitable input bypass capacitor (e.g. 680µF) must be present at this pin to minimize voltage transients and supply the switching currents needed by the regulator. |+| 2 | Output | output | Internal switch node. The voltage at this pin switches between (+VIN − VSAT) and approximately −0.5V, with a duty cycle of approximately VOUT/VIN. Drives the external inductor and catch diode. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be kept to a minimum. Rated to deliver 3A load current. |+| 3 | GND | power_in | Circuit ground / power return. |+| 4 | Feedback | input | Output voltage feedback input. Senses the regulated output voltage to close the internal feedback loop. On the fixed 3.3V version this pin connects directly to the output rail (internal divider sets 3.3V nominal). Abs max −0.3V to +40V. |+| 5 | ON/OFF | input | TTL-level shutdown input, active-high (active is 'Low' or floating for ON). Pulling this pin below ~1.3V (or leaving it open/tied to GND) turns the regulator ON; pulling above ~1.3V (up to 25V) shuts the regulator down, dropping quiescent current to ~80µA. Abs max −0.3V to +40V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | UMW |+| Package | TO-263-5 |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++- `AP1501-3.3T5L`+- `AP1501-3.3D2T`++## CAD (KiCad official)++- Symbol: `AP1501-3.3`+- Footprint: `Package_TO_SOT_SMD:TO-263-2`+- 3D model: TO-263-5 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [UMW datasheet](docs/ap1501-3-3-datasheet.pdf) (28 pp, sha256 `d716270a9a304615`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ap1501-3-3-datasheet.pdf)

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