component
LM3478MM
Public Unreviewedby Ray
Texas Instruments AC-DC Controllers and Regulators, VSSOP-8-0.65mm. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLM3478MM
Texas Instruments · AC-DC Controllers and Regulators · VSSOP-8-0.65mm
LM3478MM from Texas Instruments, in a VSSOP-8-0.65mm. 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. Nominal current sense threshold voltage is 156 mV; short-circuit limit is 343 mV (typ). |
| 2 | COMP | output | Compensation pin. A resistor-capacitor combination connected to this pin provides loop compensation for the error amplifier (Gm = 800 μmho typ). |
| 3 | FB | input | Feedback pin. The output voltage should be adjusted using a resistor divider to provide 1.26 V at this pin. FB pin current is 15 nA typ; abs-max range -0.4 V to 7 V. |
| 4 | AGND | power_in | Analog ground pin. Signal ground reference for the internal analog circuitry; should be connected to PGND at a single point near the device. |
| 5 | PGND | power_in | Power ground pin. Return for the internal push-pull driver stage which delivers up to 1 A peak into the external MOSFET gate. |
| 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 current capability; VDR clamped to 7.2 V when VIN ≥ 7.2 V (else tracks VIN). Abs-max -0.4 V to 8 V. |
| 7 | FA/SD | input | Frequency Adjust and Shutdown pin. A resistor from this pin to ground sets the oscillator frequency (100 kHz to 1 MHz; 40 kΩ ≈ 400 kHz). Pulling this pin high (above shutdown threshold, 1.27 V typ) for longer than 30 μs shuts the device down, drawing <10 μA from the supply. |
| 8 | VIN | power_in | Power supply input pin. Operating range 2.97 V to 40 V (abs-max 45 V). Non-switching supply current 2.7 mA typ; shutdown current ~5 μA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8-0.65mm |
| Category | PMIC |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
LM3478MMLM3478MMXLM3478MMMLM3478MMMX
CAD (KiCad official)
- Symbol:
LM3478MM - Footprint:
Package_SO:VSSOP-8_2.3x2mm_P0.5mm - 3D model: VSSOP-8-0.65mm (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (32 pp, sha256
87ce38ddb225e25f, 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).