bl8531ccb5tr50

@@ -0,0 +1,46 @@+# BL8531CCB5TR50++**BL Shanghai Belling** · DC-DC Converters · SOT-23-5++BL8531CCB5TR50 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 | CE | input | Chip Enable, active high. VCEH ≥ 0.8V enables the controller; VCEL ≤ 0.3V puts the device into standby (Istandby ≤ 1uA). Absolute maximum: -0.3V to (VOUT+0.3V). |+| 2 | OUT | power_in | Output-voltage sense and internal power-supply pin. The chip's switch current flows from this pin through the die to GND, so this pin is fed from the boost output rail (up to 12V absolute max, typical trimmed values 2.5-6.0V). A 1nF ceramic filter cap between OUT and GND is recommended close to the pin for a stable sense reference. |+| 3 | NC | unconnected | No internal connection. Leave floating or tie to a convenient net per board layout. |+| 4 | GND | power_in | Ground reference and return for the internal switch current. Route the OUT filter capacitor's ground terminal close to this pin. |+| 5 | EXT | output | PFM driver output for the external switching transistor (NMOSFET gate or NPN base). Sources up to ~41mA (IEXTH) and sinks up to ~31mA (IEXTL) at nominal Vout=5.0V, with a fixed 400kHz oscillator and 70-80% on-side duty cycle. Absolute maximum swing: -0.3V to (VOUT+0.3V). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | BL Shanghai Belling |+| Package | SOT-23-5 |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++- `BL8531CCB5TR50`+- `BL8531CCB5TR50CB3TR`+- `BL8531CCB5TR50CC3TR`++## CAD (KiCad official)++- Symbol: `BL8531CCB5TR50`+- 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/bl8531ccb5tr50-datasheet.pdf) (None pp, sha256 `728fb85b6bf28bac`, 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/bl8531ccb5tr50-datasheet.pdf)

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