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

Same part, different packaging or reel option.

LM3478MAX
LM3478MAXMM
LM3478MAXMMX

CAD (KiCad official)

Symbol: LM3478MAX
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lm3478max.step`	122 KB	You want the bare part, or you mark your own boards.
`lm3478max-etched.step`	1.7 MB	You want the part with `LM3478MAX` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 436 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (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