MP4473GL-Z

@@ -0,0 +1,66 @@+# MP4473GL-Z++**Monolithic Power Systems** · DC-DC Converters · QFN-20(3x4)++MP4473GL-Z from Monolithic Power Systems, in a QFN-20(3x4). 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 | AGND | power_in | Analog ground. Quiet reference for the internal analog circuitry; connect to the system ground plane with a low-impedance path. |+| 2 | FREQ | input | Frequency set (CCM). A resistor from FREQ to GND (with VIN sensing) programs the on-time and thus the switching frequency (200kHz-1MHz). Decouple with a 1nF capacitor. |+| 3 | FB | input | Feedback input. Tap of the external resistor divider from VOUT to GND that sets the output voltage; the internal reference is 0.8V (1% tolerance). |+| 4 | SS | bidirectional | Soft-start. An external capacitor programs the soft-start ramp. When EN is HIGH, an 8.5µA internal current source charges the cap and SS ramps 0→VFB; when EN goes LOW, the cap is discharged. |+| 5 | EN | input | Enable input. EN=1 enables the converter. For automatic start-up, tie EN to IN through a 100kΩ resistor. Contains an internal 1MΩ pull-down. |+| 6 | PGOOD | output | Power-good open-drain output. Goes HIGH once VFB ≥ 90% of the nominal reference; there is roughly a 700µs delay from FB reaching 90% to PGOOD asserting HIGH. Requires an external pull-up resistor. |+| 7 | BST | passive | Bootstrap. Connect a 0.1µF-1µF capacitor from BST to SW to form a floating supply for the high-side MOSFET gate driver. |+| 8 | IN | power_in | Supply voltage input, 4.5V-36V operating range. Pins 8, 19, 21, 22, 23 are all tied to IN internally; decouple with CIN close to the device using wide traces and multiple vias. |+| 9 | SW | output | Switch node output. Pins 9, 10, 17, 18, 24, 25 are all tied to SW; connect through the external inductor to VOUT. Use wide traces and multiple vias. |+| 10 | SW | output | Switch node output (see pin 9). |+| 11 | PGND | power_in | Power ground. Return for the low-side power MOSFET and reference for the regulated output. Pins 11-16 all tie to PGND; careful layout is required. |+| 12 | PGND | power_in | Power ground (see pin 11). |+| 13 | PGND | power_in | Power ground (see pin 11). |+| 14 | PGND | power_in | Power ground (see pin 11). |+| 15 | PGND | power_in | Power ground (see pin 11). |+| 16 | PGND | power_in | Power ground (see pin 11). |+| 17 | SW | output | Switch node output (see pin 9). |+| 18 | SW | output | Switch node output (see pin 9). |+| 19 | IN | power_in | Supply voltage input (see pin 8). |+| 20 | VCC | power_out | Internal 5V LDO bias supply output. Decouple with a 1µF capacitor placed as close to the pin as possible; do not use to power external loads. |+| 21 | IN | power_in | Supply voltage input, exposed pad (see pin 8). |+| 22 | IN | power_in | Supply voltage input, exposed pad (see pin 8). |+| 23 | IN | power_in | Supply voltage input, exposed pad (see pin 8). |+| 24 | SW | output | Switch node output, exposed pad (see pin 9). |+| 25 | SW | output | Switch node output, exposed pad (see pin 9). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Monolithic Power Systems |+| Package | QFN-20(3x4) |+| Category | Power Management (PMIC) |+| Pins | 25 |++## Ordering variants++Same part, different packaging or reel option.++- `MP4473GL-Z`++## CAD (KiCad official)++- Symbol: `MP4473GL-Z`+- Footprint: `Package_DFN_QFN:QFN-20-1EP_3x4mm_P0.5mm_EP1.65x2.65mm`+- 3D model: QFN-20(3x4) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Monolithic Power Systems datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8600680804737830912) (None pp, sha256 `f63834b9a4b2c9e3`, 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/mp4473gl-z-datasheet.pdf)

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