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TC5091B

Public Unreviewed

by Ray

Shenzhen Fuman Battery Management, UDFN-4-EP(1x1). Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

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TC5091B

Shenzhen Fuman · Battery Management · UDFN-4-EP(1x1)

TC5091B from Shenzhen Fuman, in a UDFN-4-EP(1x1). 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 VDD power_in Power supply input. Connect to the positive terminal of the battery (cell +). Absolute maximum -0.3V to +10V; operating range 1.5V to 6V. Sense node for overcharge (VOC=4.3V) and overdischarge (VOD=2.8V) detection.
2 GND power_in Ground/return. Connect to the negative terminal of the battery (cell −). All voltages are referenced to GND. Pins 2 and 3 are both GND and should be tied together on the PCB.
3 GND power_in Ground/return (second GND pin, internally common with pin 2). Connect to the negative terminal of the battery (cell −).
4 VM input Charge/discharge current sense input and pack negative terminal (P−). Monitors the voltage across the internal N-MOSFET (VM to GND) to detect overcurrent discharge (VEDI=+60mV), overcurrent charge (VECI=−60mV), short-circuit (ISHORT≈12A), and charger connection (VCHG). Allowed input voltage VDD−6V to VDD+0.3V.

Key specifications

Parameter Value
Manufacturer Shenzhen Fuman
Package UDFN-4-EP(1x1)
Category PMIC
Pins 4

CAD (KiCad official)

  • Symbol: TC5091B
  • Footprint: Package_DFN_QFN:UDFN-4-1EP_1x1mm_P0.65mm_EP0.48x0.48mm
  • 3D model: UDFN-4-EP(1x1) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
tc5091b.step 64 KB You want the bare part, or you mark your own boards.
tc5091b-etched.step 1.4 MB You want the part with TC5091B already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 335 faces against 41 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 (8 pp, sha256 7aa656ee83425e0b, retrieved 2026-08-17, 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: 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