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LGS4084HB6-4.35

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by Ray

Legend Si Battery Management, SOT-23-6. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Datasheet

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Contents

README

markdown

LGS4084HB6-4.35

Legend Si · Battery Management · SOT-23-6

LGS4084HB6-4.35 from Legend Si, in a SOT-23-6. 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 charging status indicator. Sinks up to 5mA to drive an LED to the negative electrode; pulls low during charging and goes high-impedance when charge completes.
2 GND power_in Chip ground reference for all internal circuitry.
3 BAT power_out Battery charging output. Connects to the positive terminal of the Li-ion cell; requires at least 10µF ceramic capacitor to GND. Float voltage is 4.35V on the '-4.35' suffix variant.
4 VCC power_in Charger input supply, 4V-24V nominal (surge tolerance to 28V), OVP threshold 6.5V. Requires at least 10µF ceramic bypass capacitor placed close to VCC/GND.
5 FULL output Open-drain full-charge status indicator. Sinks up to 5mA; pulls low when the battery has reached the CV cutoff current and is fully charged, high-impedance otherwise.
6 PROG passive Constant-current program pin. Connect a 1% resistor R_PROG from PROG to GND to set charging current: I_BAT = 1000 / R_PROG for I≥300mA; I_BAT = 900 / R_PROG for I<300mA. Example: 2K → 500mA, 9K → 100mA.

Key specifications

Parameter Value
Manufacturer Legend Si
Package SOT-23-6
Category PMIC
Pins 6

Ordering variants

Same part, different packaging or reel option.

  • LGS4084HB6-4.35

The extractor listed these alongside LGS4084HB6-4.35, but they are different parts with different electrical characteristics. Do not order them as substitutes.

  • LGS4084HB6-4.20
  • LGS4084HB6-4.35HB5-4.20
  • LGS4084HB6-4.35HB5-4.35

CAD (KiCad official)

  • Symbol: LGS4084HB6-4.35
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-23-6 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Legend Si datasheet (15 pp, sha256 6bed6065a39eb63b, 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