component
L4978
Public Made by Adomby adom
STMicroelectronics DC-DC Converters, DIP-8. Pinout cross-checked by two models against the datasheet, 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
markdownL4978
STMicroelectronics · DC-DC Converters · DIP-8
L4978 from STMicroelectronics, in a DIP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground. |
| 2 | SS_INH | input | Active-low logic input that disables the device (sleep mode) when grounded (driven by open collector/drain); a capacitor to ground sets the soft start time. |
| 3 | OSC | passive | An external resistor from the unregulated input voltage and a capacitor to ground set the switching frequency (line feed forward obtained automatically), up to 300kHz. |
| 4 | OUT | output | Step-down regulator output (switch node of the internal power D-MOS). |
| 5 | VCC | power_in | Unregulated DC input voltage, operating range 8V to 55V (absolute maximum 58V). |
| 6 | BOOT | passive | A capacitor connected between this pin and OUT drives the internal DMOS transistor; maximum bootstrap voltage 70V. |
| 7 | COMP | output | Error amplifier output used for frequency compensation. |
| 8 | FB | input | Step-down feedback input; connecting directly gives 3.3V output, an external resistive divider is required for higher output voltages. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | DIP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
L4978 - Footprint:
Package_DIP:DIP-8_W7.62mm - 3D model: DIP-8 (KiCad packages3D, STEP)
- 3D model files:
l4978-etched.step/l4978-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);l4978.step/l4978.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (13 pp, sha256
12d64e9c104d08a2, retrieved 2026-10-01, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).