# LM2841XMK-ADJL

**Texas Instruments** · DC-DC Converters · TSOT-23-6

LM2841XMK-ADJL from Texas Instruments, in a TSOT-23-6. 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 | CB | input | SW FET gate bias voltage; connect the CBOOT capacitor between CB and SW, with CB voltage above SW limited to 7 V absolute maximum. |
| 2 | GND | power_in | Ground connection for the device. |
| 3 | FB | input | Feedback pin set by the divider VOUT = VFB(1 + R1/R2) with VFB of 0.765 V; resistors must be from 100 Ω to 10 kΩ to avoid input bias errors. |
| 4 | SHDN | input | Logic-level shutdown input that disables the device when pulled to GND and enables it when pulled high; if unused tie to VIN and do not allow it to float. |
| 5 | VIN | power_in | Power input voltage pin with a 4.5-V to 42-V normal operating range. |
| 6 | SW | output | Power FET output connected to the inductor, diode, and CBOOT capacitor, with SW voltage rated to 45 V absolute maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSOT-23-6 |
| Category | Power Management (PMIC) |
| Pins | 6 |

## 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 | VIN | 4.5 |  | 42 | V | Recommended operating range | 4 |
| Operating junction temperature | TJ | -40 |  | 125 | °C |  | 4 |
| SW voltage | VSW |  |  | 42 | V |  | 4 |
| VIN absolute maximum | VIN | -0.3 |  | 45 | V |  | 4 |
| SHDN voltage | VSHDN | -0.3 |  |  | V | (VIN + 0.3 V) < 45 V | 4 |
| SW voltage absolute maximum | VSW | -0.3 |  | 45 | V |  | 4 |
| CB voltage above SW voltage | VCB |  |  | 7 | V |  | 4 |
| FB voltage | VFB | -0.3 |  | 5 | V |  | 4 |
| Maximum junction temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Junction-to-ambient thermal resistance | RθJA |  | 121 |  | °C/W |  | 4 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 94 |  | °C/W |  | 4 |
| Quiescent current | IQ |  | 16 | 40 | µA | SHDN = 0 V, TJ = -40°C to 125°C | 5 |
| Quiescent current device on not switching | IQ |  | 1.3 | 1.75 | mA | Device ON, not switching, TJ = -40°C to 125°C | 5 |
| Quiescent current device on no load | IQ |  | 1.35 | 1.85 | mA | Device ON, no load, TJ = -40°C to 125°C | 5 |
| Switch ON resistance | RDSON |  | 0.9 | 1.6 | Ω | See (4), TJ = -40°C to 125°C | 5 |
| Switch leakage current | ILSW |  | 0 | 0.5 | µA | VIN = 42 V, TJ = -40°C to 125°C | 5 |
| Switch current limit LM2841 | ICL | 525 |  | 900 | mA | LM2841(5), TJ = -40°C to 125°C for max | 5 |
| Feedback pin bias current | IFB |  | 0.1 | 1 | µA | LM284[0,1,2](6), TJ = -40°C to 125°C for max | 5 |
| FB pin reference voltage | VFB | 0.747 | 0.765 | 0.782 | V | TJ = -40°C to 125°C for min and max | 5 |
| Minimum ON-time | tON(min) |  | 100 | 150 | ns | See (7), TJ = -40°C to 125°C for max | 5 |
| Minimum OFF-time X option | tOFF(min) |  | 110 | 370 | ns | X option, TJ = -40°C to 125°C for max | 5 |
| Switching frequency X option | fSW | 325 | 550 | 750 | kHz | X option, VFB = 0.5 V, TJ = -40°C to 125°C for min and max | 5 |
| Maximum duty cycle X option | DMAX | 88 | 94 |  | % | X option, TJ = -40°C to 125°C for min | 5 |
| Undervoltage lockout on threshold | VUVP |  | 3.7 | 4.4 | V | On threshold, TJ = -40°C to 125°C for max | 6 |
| Undervoltage lockout off threshold | VUVP | 3.25 | 3.5 |  | V | Off threshold, TJ = -40°C to 125°C for min | 6 |
| Shutdown threshold device ON | VSHDN |  | 1 | 2.3 | V | Device ON, TJ = -40°C to 125°C for max | 6 |
| Shutdown threshold device OFF | VSHDN | 0.3 | 0.9 |  | V | Device OFF, TJ = -40°C to 125°C for min | 6 |
| Shutdown pin input bias current VSHDN = 2.3 V | ISHDN |  | 0.05 | 1.5 | µA | VSHDN = 2.3 V, TJ = -40°C to 125°C for max | 6 |
| Shutdown pin input bias current VSHDN = 0 V | ISHDN |  | 0.02 | 1.5 | µA | VSHDN = 0 V, TJ = -40°C to 125°C for max | 6 |

## 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 |  | to the FB pin, and away from the inductor to minimize coupling noise into the feedback pin. The input bypass capacitor CIN must be placed close to the VIN pin. This reduces copper trace resistance, wh | 16 |

## CAD (KiCad official)

- Symbol: `LM2841XMK-ADJL`
- Footprint: `Package_TO_SOT_SMD:TSOT-23-6`
- 3D model: TSOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `lm2841xmk-adjl-etched.step` / `lm2841xmk-adjl-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2841xmk-adjl.step` / `lm2841xmk-adjl.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/lit/ds/symlink/lm2841.pdf) (28 pp, sha256 `8a38a14f123a248e`, retrieved 2026-11-05, tier: manufacturer)
- **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/lm2841xmk-adjl-datasheet.pdf)