# LT3970EMS#TRPBF

**Analog Devices** · DC-DC Converters · MSOP-10

LT3970EMS#TRPBF from Analog Devices, in a MSOP-10. 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 | FB | input | Feedback pin regulated to 1.21V; connect the feedback resistor divider tap here (LT3970 adjustable version). |
| 2 | EN | input | Shutdown when low and active when high, with a 1V rising and 0.97V falling hysteretic threshold; tie to VIN if unused, and ground it if VIN is below 4.2V. |
| 3 | VIN | power_in | Supplies current to the internal circuitry and the internal power switch; must be locally bypassed. |
| 4 | GND | power_in | Ground pin that must be soldered to the PCB. |
| 5 | GND | power_in | Ground pin that must be soldered to the PCB. |
| 6 | SW | output | Output of the internal power switch; connect to the inductor. |
| 7 | BOOST | passive | Provides a drive voltage higher than the input voltage to the internal bipolar NPN power switch. |
| 8 | BD | input | Anode of the boost diode, which also supplies current to the internal regulator when BD is above 3.2V. |
| 9 | PG | output | Open-drain output of an internal comparator that stays low until FB is within 10% of final regulation; valid when VIN is above 4.2V and EN is high. |
| 10 | RT | passive | A resistor tied between RT and ground sets the switching frequency. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | MSOP-10 |
| Category | Power Management ICs |
| Pins | 10 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | resistance further. In the MSOP package, the copper lead | 18 |

## CAD (KiCad official)

- Symbol: `LT3970EMS#TRPBF`
- Footprint: `Package_SO:MSOP-10_3x3mm_P0.5mm`
- 3D model: MSOP-10 (KiCad packages3D, STEP)
- 3D model files: `lt3970ems-trpbf-etched.step` / `lt3970ems-trpbf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lt3970ems-trpbf.step` / `lt3970ems-trpbf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Analog Devices datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/lt3970.pdf) (24 pp, sha256 `e25978555387c0ba`, retrieved 2026-10-30, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/lt3970ems-trpbf-datasheet.pdf)