# LM2578AN

**Texas Instruments** · DC-DC Converters · PDIP-8

LM2578AN from Texas Instruments, in a PDIP-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 | -INPUT | input | Inverting comparator input with an internal 1.0V reference; the feedback input used for buck, boost and inverting configurations. |
| 2 | +INPUT | input | Non-inverting comparator input with an internal 1.0V reference; any external voltage applied above the reference must be limited to less than 5 mA. |
| 3 | OSC | passive | Oscillator pin where a single external timing capacitor sets the switching frequency from <1 Hz to 100 kHz, fOSC = 8x10^-5/C1. |
| 4 | GND | power_in | Ground; the emitter must not be pulled more than 1V below this pin (0.6V for TJ >= 100°C). |
| 5 | EMITTER | output | Emitter of the 750 mA output transistor, which must not be driven more than 1V below ground and is rated -1V to +50V. |
| 6 | COLLECTOR | output | Collector of the 750 mA output transistor, rated -0.3V to +50V with saturation voltage under 0.9V. |
| 7 | CURRENT LIMIT | input | Cycle-by-cycle current limit terminal referenced to either VIN or ground, activating when pulled 110 mV away from either. |
| 8 | VIN | power_in | Supply input operating from 2V to 40V, with total supply voltage rated at 50V maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | PDIP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM2578AN`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: PDIP-8 (KiCad packages3D, STEP)
- 3D model files: `lm2578an-etched.step` / `lm2578an-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2578an.step` / `lm2578an.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lm2578a) (33 pp, sha256 `6b628780505f380b`, retrieved 2026-10-07, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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).

[Datasheet PDF](docs/lm2578an-datasheet.pdf)