BL8039CB5TR

@@ -0,0 +1,44 @@+# BL8039CB5TR++**BL Shanghai Belling** · DC-DC Converters · SOT-23-5++BL8039CB5TR from BL Shanghai Belling, in a SOT-23-5. 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 | EN | input | Enable input. Drive high (VIH >= 1.2V) to enable the converter; drive low (VIL <= 0.5V) to place the part in shutdown (IQ < 1uA). Do not leave floating. |+| 2 | GND | power_in | Device ground and power return for the internal low-side synchronous NMOS. Tie to the ground plane with a short, wide, low-inductance path. |+| 3 | SW | output | Switch node. Connects to the drains of the internal high-side PMOS and low-side NMOS. Connect the external power inductor (typ. 1uH-2.2uH) between SW and the regulated output. Keep trace short and wide to minimize EMI. |+| 4 | VIN | power_in | Supply input, 2.6V to 5.5V (8V abs max, 6.1V OVP threshold). Bypass with a low-ESR ceramic capacitor (typ. 10uF) placed as close as possible to the pin. |+| 5 | FB | input | Feedback input to the error amplifier, regulated to VREF = 0.6V (+/-2%). Connect an external resistor divider from VOUT to FB and GND to set output between 0.6V and VIN: R_TOP = R_BOTTOM * (VOUT/0.6 - 1). Feedback leakage 0.1uA typ. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | BL Shanghai Belling |+| Package | SOT-23-5 |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++- `BL8039CB5TRCB5TR`++## CAD (KiCad official)++- Symbol: `BL8039CB5TR`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [BL Shanghai Belling datasheet](docs/bl8039cb5tr-datasheet.pdf) (7 pp, sha256 `ae8ae21196a5c32f`, 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/bl8039cb5tr-datasheet.pdf)

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