# TMI4054

**TMI** · Battery Management · SOT-23-5

TMI4054 from TMI, 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 | CHAG | output | Charge-status indicator pin that is pulled low while charging and goes high-impedance when charging terminates. |
| 2 | GND | power_in | IC ground pin. |
| 3 | BAT | power_out | Connects to the positive terminal of the single-cell Li-ion battery being charged. |
| 4 | VIN | power_in | IC power input pin; the datasheet's surge tests show the input tolerating up to 10V, but no absolute maximum rating is stated in the text. |
| 5 | PROG | passive | Charge-current programming pin; the charge current is set by the resistor connected from this pin, with R_PROG values of 1.5kΩ to 30kΩ tabulated. |

## Key specifications

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

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Programmable charge current (maximum) |  |  |  | 800 | mA | Feature bullet: up to 800mA programmable charge current (set by PROG resistor) | 3 |
| Battery standby current |  |  |  | 1 | µA | Feature bullet: <1µA battery quiescent current; no test conditions printed | 3 |
| Preset charge voltage accuracy |  | -1 |  | 1 | % | Feature bullet: accuracy of ±1% on the 4.2V preset charge voltage | 3 |

## CAD (KiCad official)

- Symbol: `TMI4054`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `tmi4054-etched.step` / `tmi4054-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tmi4054.step` / `tmi4054.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588906225199427584) (15 pp, sha256 `bf597d1791a044e9`, retrieved 2026-10-18, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/tmi4054-datasheet.pdf)