PT4115B89E

@@ -0,0 +1,47 @@+# PT4115B89E++**PowTech CR PowTech Shanghai** · LED Drivers · SOT-89-5++PT4115B89E from PowTech CR PowTech Shanghai, in a SOT-89-5. 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 | SW | output | Switch output. Drain of the internal high-side N-channel MOSFET switch (Rds(on) ~0.4-0.6 Ω, Isw <=1.2 A continuous, absolute max 1.5 A, -0.3 to 45 V). Connects to the inductor (and the freewheel diode cathode) in the buck power stage. |+| 2 | GND | power_in | Signal and power ground. Connect directly to the ground plane; also serves as the return for the internal MOSFET switch current. |+| 3 | DIM | input | Logic-level dimming / enable input. Drive below 0.3 V to disable the current regulator (shutdown, Iq ~95 µA); drive >=2.5 V to enable full LED current. Accepts a DC voltage from 0.5-2.5 V for linear brightness control, or a PWM signal from 100 Hz up to 20 kHz for duty-cycle dimming (5000:1 range). Internally pulled to a 5 V rail via a ~200 kΩ resistor, so the pin may be left floating for always-on operation. Absolute max -0.3 to 6 V. |+| 4 | CSN | input | High-side current-sense input. Connects to the low side of the external sense resistor Rs (which sits between VIN and CSN). The internal comparator regulates the average voltage (VIN - VCSN) to ~100 mV (98 mV A-type / 102 mV B-type), giving ILED_avg ≈ 0.1 V / Rs. Input current ~8 µA; absolute max +0.3 V to -6.0 V with respect to VIN. |+| 5 | VIN | power_in | Input supply pin. Operating range 6 V to 30 V (absolute max -0.3 to 45 V); UVLO ~5.1 V with ~500 mV hysteresis. Must be locally bypassed (typ. 100 µF ceramic/electrolytic to GND close to the pin). Also serves as the high-side reference for the current-sense comparator. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | PowTech CR PowTech Shanghai |+| Package | SOT-89-5 |+| Category | LED-drv |+| Pins | 5 |++## Ordering variants++- `PT4115B89E`+- `PT4115B89E-B`+- `PT4115B89EPT4115BSOH`+- `PT4115B89EPT4115BSOH-B`++## CAD (KiCad official)++- Symbol: `PT4115B89E`+- Footprint: `Package_TO_SOT_SMD:SOT-89-3`+- 3D model: SOT-89-5 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [PowTech CR PowTech Shanghai datasheet](docs/pt4115b89e-datasheet.pdf) (18 pp, sha256 `24a8e87d81cf2d2d`, 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/pt4115b89e-datasheet.pdf)

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