QX9920

@@ -0,0 +1,42 @@+# QX9920++**QX Micro Devices** · LED Drivers · SOT-23-6L++QX9920 from QX Micro Devices, 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 | DRV | output | Gate drive output for the external N-channel power MOSFET. Provides the gate switching signal generated by the internal RS latch / off-time logic. Maximum pin current 100mA; leave floating when no external MOSFET is used. |+| 2 | VSS | power_in | Device ground / power return. Connects to the negative rail of the supply. |+| 3 | EN | input | Chip enable input, active high. Logic-high threshold 0.4*VOUT, logic-low ≤0.3V, input current 0.1µA at logic high. A PWM signal on EN dims the LED brightness. |+| 4 | VDD | power_in | Internal circuit supply pin. Operating range 2.5V to 6V (absolute range noted as 2V-6.5V in pin table). Typically fed from VIN through a series resistor with a 2.5V-5.5V zener clamp when VIN exceeds this range. |+| 5 | TOFF | input | External MOSFET off-time setting pin. Off-time set by an R (ROFF) and C (COFF) network to VDD/GND per TOFF = 0.51 * (100kΩ·ROFF / (ROFF+100kΩ)) * (COFF + 12pF). If left unconnected, internal off-time defaults to 612ns. |+| 6 | CS | input | Current-sense feedback input. Connect to the top of the source-sense resistor Rcs on the external MOSFET source. Internal reference is 250mV (240-260mV), so LED current I_LED = 250mV / Rcs. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | QX Micro Devices |+| Package | SOT-23-6L |+| Category | LED-drv |+| Pins | 6 |++## CAD (KiCad official)++- Symbol: `QX9920`+- 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:** [QX Micro Devices datasheet](docs/qx9920-datasheet.pdf) (7 pp, sha256 `48a3c3d1a329b82e`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **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/qx9920-datasheet.pdf)

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