# ETA1485E8A

**etasolution** · DC-DC Converters · ESOP-8

ETA1485E8A from etasolution, in a ESOP-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 | BST | passive | Bootstrap pin for the high-side gate drive; connect a 10nF capacitor from this pin to SW. |
| 2 | IN | power_in | Supply voltage input (3.6V to 18V operating range, 20V absolute maximum); bypass with a 22μF ceramic capacitor to GND. |
| 3 | SW | output | Switch node connecting the internal power MOSFETs to the external inductor, which connects between SW and the regulator output. |
| 4 | GND | power_in | Ground reference for the device. |
| 5 | FB | input | Feedback input (0.923V reference); connect an external resistor divider from the output to FB and GND to set VOUT. |
| 6 | COMP | passive | Regulator compensation node; connect a series RC network to GND. |
| 7 | EN | input | Enable input: drive high to enable the part and low to disable it (EN input low maximum 0.6V, high minimum 1.3V). |
| 8 | SS | passive | Soft-start pin; connect a 0.1μF capacitor from this pin to GND. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | etasolution |
| Package | ESOP-8 |
| Category | Power Management (PMIC) |
| Pins | 9 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Voltage Range |  | 3.6 |  | 18 | V |  | 2 |
| FB Feedback Voltage |  | 0.904 | 0.923 | 0.942 | V |  | 2 |
| IN Voltage |  | -0.3 |  | 20 | V |  | 2 |
| SW, EN Voltage (max VIN+0.3V) |  | -0.3 |  |  | V |  | 2 |
| BST Voltage (max SW+6V) |  | -0.3 |  |  | V |  | 2 |
| FB Voltage |  | -0.3 |  | 6 | V |  | 2 |
| Operating Temperature Range |  | -40 |  | 85 | °C |  | 2 |
| Storage Temperature Range |  | -55 |  | 150 | °C |  | 2 |
| Input UVLO Rising |  |  | 3.55 |  | V | Hysteresis=140mV | 2 |
| Input Supply Current |  |  | 1 |  | mA | VFB =1.0V | 2 |
| Input Shutdown Current |  |  | 6 |  | μA |  | 2 |
| FB Input Current |  |  | 0.01 |  | μA |  | 2 |
| Error Amp Transconductance |  |  | 800 |  | μS |  | 2 |
| Current Sense Transresistance |  |  | 0.2 |  |  |  | 2 |
| Switching Frequency |  |  | 340 |  | KHz |  | 2 |
| High side Switch On Resistance |  |  | 120 |  | m | ISW =200mA | 2 |
| Low side Switch On Resistance |  |  | 100 |  | m | ISW =200mA | 2 |
| High side Switch Current Limit |  |  | 3.5 |  | A |  | 2 |
| SW Leakage Current |  |  | 10 |  | μA | VIN=12V,VSW=0 or 12V, EN= GND | 2 |
| EN Input Current |  |  | 1 |  | μA |  | 2 |
| EN Input Low Voltage |  |  | 0.6 |  | V |  | 2 |
| EN Input High Voltage |  |  | 1.3 |  | V |  | 2 |
| Thermal Shutdown |  |  | 150 |  | °C | Hysteresis=40°C | 2 |

## CAD (KiCad official)

- Symbol: `ETA1485E8A`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `eta1485e8a-etched.step` / `eta1485e8a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `eta1485e8a.step` / `eta1485e8a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [etasolution datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603065706628071424) (5 pp, sha256 `8fddb2bbda78ca14`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-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).

[Datasheet PDF](docs/eta1485e8a-datasheet.pdf)