MD8942

@@ -0,0 +1,41 @@+# MD8942++**Shanghai Mingda Microelectronics** · DC-DC Converters · SOT-23-6L++MD8942 from Shanghai Mingda Microelectronics, in a SOT-23-6L. 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 providing gate-drive bias for the internal high-side switch FET. Connect a bootstrap capacitor (Cboot) between BST and SW. Absolute max BST-to-SW voltage is 6V; internally charged to ~5V from VCB through a diode. |+| 2 | GND | power_in | Device ground connection. Should be connected as close as possible to the output capacitor to avoid high current switching paths and to serve as the reference for feedback and enable. |+| 3 | FB | input | Feedback input to the internal error amplifier. Set the output voltage via a resistor divider from VOUT to FB using VOUT = VFB × (1 + R2/R1), where VFB is typically 0.794V. Absolute max -0.3V to 6V. |+| 4 | EN | input | Enable input, active-high logic. Pulling EN above the ~1V rising threshold enables the chip; pulling below the falling threshold (~0.84V, 160mV hysteresis) shuts it down. Floating EN disables the chip (internal 430kΩ pull-down to GND). Internal zener clamps EN to ~5V, absolute max 6V, sink current limit 100µA. |+| 5 | VIN | power_in | Input supply pin. Operating range 4V to 36V, standoff input voltage 42V. Bypass with a low-ESR ceramic input capacitor (typ. 10µF) placed as close as possible to VIN and GND. |+| 6 | SW | output | Switch node - the output of the internal high-side and low-side power MOSFETs. Connect to the external inductor and to the bootstrap capacitor's low side. Absolute max -0.3V to VIN(MAX)+0.3V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Shanghai Mingda Microelectronics |+| Package | SOT-23-6L |+| Category | PMIC |+| Pins | 6 |++## CAD (KiCad official)++- Symbol: `MD8942`+- Footprint: `Package_TO_SOT_SMD:SOT-23-6`+- 3D model: SOT-23-6L (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Shanghai Mingda Microelectronics datasheet](docs/md8942-datasheet.pdf) (13 pp, sha256 `758503482648cacf`, 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/md8942-datasheet.pdf)

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