LM5019MRX

@@ -0,0 +1,51 @@+# LM5019MRX++**Texas Instruments** · DC-DC Converters · SO-8-EP++LM5019MRX from Texas Instruments, in a SO-8-EP. 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 | RTN | power_in | Ground return of the integrated circuit. Also the reference for all internal analog and power domains. The exposed pad must be tied to this pin. |+| 2 | VIN | power_in | Input supply pin. Operating input voltage range is 7.5 V to 100 V. Feeds the internal high-voltage startup regulator and the high-side power MOSFET. |+| 3 | UVLO | input | Input to the undervoltage lockout comparator. A resistor divider from VIN sets the UVLO threshold; an internal current source provides programmable hysteresis when UVLO > 1.225 V. Pulling UVLO below 0.66 V forces shutdown. |+| 4 | RON | input | On-time programming pin. A resistor from RON to VIN sets the high-side switch on-time as a function of VIN, giving nearly constant switching frequency. Minimum recommended on-time is 100 ns at maximum VIN. |+| 5 | FB | input | Feedback pin, connected to the inverting input of the internal regulation comparator. Internal reference is 1.225 V; set output voltage with an external divider from VOUT to FB to RTN. |+| 6 | VCC | power_out | Output of the internal high-voltage series pass regulator, regulated at 7.6 V. Provides bias for the gate drivers and internal circuitry. Bypass with a 1.0-uF ceramic capacitor to RTN. |+| 7 | BST | power_in | Bootstrap capacitor pin for the high-side gate driver. Connect a 0.01-uF ceramic capacitor between BST and SW. The BST capacitor is refreshed from VCC through an internal diode while SW is low. |+| 8 | SW | output | Switching node between the integrated high-side and low-side power MOSFETs. Connect to the output inductor and to the bottom plate of the bootstrap capacitor. Absolute max SW to RTN is -1.5 V (steady) / -5 V (100-ns transient). |+| EP | EP | power_in | Exposed thermal pad on the underside of the package. Must be electrically connected to the RTN pin and tied to the system ground plane for reduced thermal resistance. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SO-8-EP |+| Category | PMIC |+| Pins | 9 |++## Ordering variants++- `LM5019MRXMR`+- `LM5019MRXMRX`+- `LM5019MRXSD`+- `LM5019MRXSDX`++## CAD (KiCad official)++- Symbol: `LM5019MRX`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SO-8-EP (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](docs/lm5019mrx-datasheet.pdf) (35 pp, sha256 `994feed72dee9bcb`, 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/lm5019mrx-datasheet.pdf)

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