LM3478MAX

@@ -0,0 +1,50 @@+# LM3478MAX++**Texas Instruments** · DC-DC Converters · SOIC-8++LM3478MAX from Texas Instruments, in a SOIC-8. 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 | ISEN | input | Current sense input pin. Voltage generated across an external sense resistor is fed into this pin. Current sense threshold voltage is typically 156 mV (VIN = 5 V); short-circuit current-limit sense voltage is typically 343 mV. Absolute maximum ISEN pin voltage is 500 mV. |+| 2 | COMP | output | Compensation pin. A resistor-capacitor combination connected to this pin provides compensation for the control loop (error amplifier output). |+| 3 | FB | input | Feedback pin. The output voltage should be adjusted using a resistor divider to provide 1.26 V at this pin (VFB typical 1.26 V, ±2.5% over temperature). Absolute maximum FB pin voltage is 7 V. |+| 4 | AGND | power_in | Analog ground pin. Return for the internal control circuitry and reference. Should be tied to PGND at a single point near the IC. |+| 5 | PGND | power_in | Power ground pin. Return for the internal MOSFET gate driver; carries the peak driver currents (up to 1 A). Route separately from AGND back to a single ground reference point. |+| 6 | DR | output | Drive pin. The gate of the external N-channel MOSFET should be connected to this pin. Internal push-pull driver with 1 A peak capability. Drive voltage swings to VIN (VIN < 7.2 V) or clamped at 7.2 V (VIN ≥ 7.2 V). Absolute maximum VDR is 8 V. |+| 7 | FA/SD | input | Frequency Adjust and Shutdown pin. A resistor connected to this pin sets the oscillator frequency (100 kHz to 1 MHz; RFA = 40 kΩ gives 400 kHz nominal). A high level on this pin for longer than 30 µs will turn the device off; in shutdown the device draws less than 10 µA from the supply. Absolute maximum VFA/SD is 7 V. |+| 8 | VIN | power_in | Power Supply Input pin. Operating range 2.97 V to 40 V (absolute maximum 45 V). Undervoltage lockout at 2.85 V typical with 170 mV hysteresis. Non-switching supply current typically 2.7 mA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `LM3478MAXMA`+- `LM3478MAXMAX`+- `LM3478MAXMM`+- `LM3478MAXMMX`++## CAD (KiCad official)++- Symbol: `LM3478MAX`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm3478max.pdf) (41 pp, sha256 `a36ddadf5018c4d9`, retrieved 2026-08-17, tier: manufacturer)+- **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/lm3478max-datasheet.pdf)

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