# SM5308

**HICHON** · Battery Management ICs · ESOP-8

SM5308 from HICHON, 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 | VIN | power_in | DC 5V charging input pin; the datasheet gives an input voltage range of 4.65 V to 5.5 V (absolute maximum -0.3 V to 6 V). |
| 2 | LED1 | output | LED display driver pin for the battery-level indicator, with a stated LED display drive current of 6 mA per LED output (IL1/IL2/IL3). |
| 3 | LED2 | output | LED display driver pin for the battery-level indicator, with a stated LED display drive current of 6 mA per LED output (IL1/IL2/IL3); in MCU status-read mode it outputs a square wave whose frequency encodes the IC state. |
| 4 | LED3 | output | LED display driver pin for the battery-level indicator, with a stated LED display drive current of 6 mA per LED output (IL1/IL2/IL3). |
| 5 | KEY | bidirectional | Key input pin multiplexed with the lighting LED drive, with a stated lighting LED drive current of 17 mA; leave it floating when no key is used. |
| 6 | BAT | power_in | Boost input pin connected to the positive terminal of the lithium battery, with a stated battery operating voltage of 3.0 V to 4.4 V. |
| 7 | SW | output | DC-DC switching pin that must connect to the inductor through R10 and C8 placed close to the pin, per the PCB layout notes. |
| 8 | VOUT | power_out | 5 V boost output pin with a stated DC output voltage of 5.0 V and a boost output current capability of up to 2.4 A. |
| 9 | Power PAD | power_in | Exposed thermal pad connected to ground (GND) that must make good contact with the PCB ground for heat dissipation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HICHON |
| Package | ESOP-8 |
| Category | Power Supply Chip |
| 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 |
|---|---|---|---|---|---|---|---|
| VIN input voltage (charge input) | VIN | 4.65 | 5 | 5.5 | V |  | 4 |
| Battery operating voltage | VBAT | 3 |  | 4.4 | V |  | 4 |
| VIN pin voltage | VIN | -0.3 |  | 6 | V |  | 3 |
| All other pins voltage |  | -0.3 |  | 5.5 | V | All other pins | 3 |
| Operating junction temperature range (TJ) | TJ | -40 |  | 125 | ℃ |  | 3 |
| Storage temperature range (TSTG) | TSTG | -40 |  | 150 | ℃ |  | 3 |
| Human body model ESD rating (HBM) |  |  |  | 2 | KV | Human body model (HBM) | 3 |

## CAD (KiCad official)

- Symbol: `SM5308`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `sm5308-etched.step` / `sm5308-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sm5308.step` / `sm5308.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HICHON datasheet](docs/sm5308-datasheet.pdf) (11 pp, sha256 `55afbb1178ff403f`, retrieved 2026-10-21, 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/sm5308-datasheet.pdf)