BL9342

@@ -0,0 +1,41 @@+# BL9342++**BL Shanghai Belling** · DC-DC Converters · SOT-23-6++BL9342 from BL Shanghai Belling, in a SOT-23-6. 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 | BST | passive | Bootstrap pin. Positive supply for the internal floating high-side MOSFET driver. Connect a bypass capacitor (typ. 100 nF) between BST and SW; capacitor is charged from an internal regulator to ~5 V. |+| 2 | GND | power_in | Ground. Route as close as possible to the output capacitor return and away from high-current switching paths. |+| 3 | FB | input | Feedback input to the internal error amplifier. An external resistor divider from VOUT to GND sets the regulated output voltage, compared against the internal 0.794 V (typ. 0.8 V) reference. Recommended R1 ≈ 124 kΩ for optimal loop response. |+| 4 | EN | input | Enable input, active high. VIH ≥ 1.6 V (typ. 2.0 V) turns the chip on; pulling below the threshold shuts it down. Hysteresis 0.6 V. Internally pulled to GND so floating EN disables the part; do not leave floating in operation. |+| 5 | VIN | power_in | Power supply input, 4.2 V to 40 V (absolute max 43 V). Supplies all internal control circuitry and the integrated high-side power MOSFET. Decouple to GND with a low-ESR capacitor (e.g. 4.7 µF/50 V) placed close to the pin to minimise switching spikes. |+| 6 | SW | output | Switch node output from the internal high-side power MOSFET (RDS(on) ≈ 500 mΩ). Connect the inductor here and place a low-VF Schottky freewheeling diode from SW to GND close to the pin. Rated up to VIN (max 40 V). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | BL Shanghai Belling |+| Package | SOT-23-6 |+| Category | PMIC |+| Pins | 6 |++## CAD (KiCad official)++- Symbol: `BL9342`+- Footprint: `Package_TO_SOT_SMD:SOT-23-6`+- 3D model: SOT-23-6 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [BL Shanghai Belling datasheet](docs/bl9342-datasheet.pdf) (10 pp, sha256 `f05713c35e4f834e`, 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/bl9342-datasheet.pdf)

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