# LMR62421XMFE

**Texas Instruments** · DC-DC Converters · SOT-23-5

LMR62421XMFE from Texas Instruments, in a SOT-23-5. 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 | SW | output | Switch node for boost converter; connect to inductor and output diode. |
| 2 | GND | power_in | Signal and power ground reference pin; place feedback network bottom resistor as close as possible to this pin. |
| 3 | FB | input | Feedback input pin for external resistor divider voltage regulation; operates at nominal feedback voltage of 1.255V (min 1.230V, max 1.280V over −40 to +125°C junction temperature range). |
| 4 | EN | input | Shutdown control input requiring logic high (≥1.8V typical) for operation and logic low (≤0.4V typical) for shutdown; voltage must not exceed VIN + 0.3V. |
| 5 | VIN | power_in | Supply voltage input for power stage and switching regulator with operating voltage range 2.7V to 5.5V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |

## CAD (KiCad official)

- Symbol: `LMR62421XMFE`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `lmr62421xmfe-etched.step` / `lmr62421xmfe-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lmr62421xmfe.step` / `lmr62421xmfe.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/lmr62421) (30 pp, sha256 `7e3326c2cd12601a`, retrieved 2026-09-26, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/lmr62421xmfe-datasheet.pdf)