component

FM4057S52

Public Made by Adom

by adom

Shenzhen Fuman Battery Management, SOT-23-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs fm4057s52: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
fm4057s52-etched.fit.json fm4057s52: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
fm4057s52-etched.glb fm4057s52: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
fm4057s52-etched.step fm4057s52: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
fm4057s52.glb Publish 0.1.0 · Ray
fm4057s52.kicad_mod Publish 0.1.0 · Ray
fm4057s52.kicad_sym Publish 0.1.0 · Ray
fm4057s52.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
fm4057s52.step Publish 0.1.0 · Ray
package.json Publish 0.2.0 · Ray
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
page.json fm4057s52: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray
README.md fm4057s52: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

FM4057S52

Shenzhen Fuman · Battery Management · SOT-23-5

FM4057S52 from Shenzhen Fuman, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 CHRG output Open-drain charge status indicator. Drives an external LED (to VIN through a series resistor): pulled low (LED on) while charging, high-impedance (LED off) when charge terminates.
2 GND power_in Device ground / analog return. Connect directly to the system ground plane.
3 BAT power_out Battery connection and charger output. Sources the constant-current / constant-voltage charge current to the single-cell Li-ion pack. Regulated to 4.2V (S52), with battery-OVP at ~104% of VBAT_FULL and recharge threshold ~4.05V. Bypass with a 10µF ceramic capacitor to GND.
4 VIN power_in Charger power input. Recommended 4.2-6.5V operating range, absolute-max 32V (the part's headline 32V input tolerance). VIN UVLO rising ~4.6V / falling ~4.2V; VIN OVP ~6.5V. A 1µF ceramic bypass to GND is recommended (may be omitted per app circuit).
5 ISET input Charge-current programming pin. A resistor from ISET to GND sets the constant-current charge level: RISET ≈ 3kΩ → 1.0A, 5kΩ → 0.6A, 6kΩ → 0.5A. Precharge current is ~60mA and termination current is ~60mA at RISET=5kΩ.

Key specifications

Parameter Value
Manufacturer Shenzhen Fuman
Package SOT-23-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • FM4057S52
  • FM4057S52BS52
  • FM4057S52S53
  • FM4057S52S54
  • FM4057S52S42
  • FM4057S52S43
  • FM4057S52S44
  • FM4057S52E42
  • FM4057S52BE42
  • FM4057S52E43
  • FM4057S52E44
  • FM4057S52D42
  • FM4057S52D43
  • FM4057S52D44

CAD (KiCad official)

  • Symbol: FM4057S52
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: fm4057s52-etched.step / fm4057s52-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); fm4057s52.step / fm4057s52.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
fm4057s52.step 85 KB You want the bare part, or you mark your own boards.
fm4057s52-etched.step 1.8 MB You want the part with FM4057S52 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 437 faces against 102 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: Shenzhen Fuman datasheet (14 pp, sha256 bfc23830eabbc3b5, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF