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TC6291B

Public Made by Adom

by adom

Shenzhen Fuman DC-DC Converters, SOT-23-6. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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TC6291B

Shenzhen Fuman · DC-DC Converters · SOT-23-6

TC6291B from Shenzhen Fuman, in a SOT-23-6. 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 LX output Switch output (drain of internal 0.2Ω, 2A, 16V power MOSFET); LX voltage rating 0 to 16 V.
2 GND power_in IC ground.
3 FB input Inverting input of the error amplifier, referenced to 0.6V (±2%); voltage range 0 to 6 V.
4 EN input Active-high enable input; enable voltage 0.96 V, shutdown below 0.6 V, voltage range 0 to 6 V.
5 VCC power_in IC supply; operating range 2.6 V to 5.5 V, absolute maximum 6 V.
6 OC input Adjustable current limit set by resistor to GND of 36K to 100K (0.5A to 1.5A, IOCP=55000/R3); left floating is the default active limit, no capacitor on this pin.

Key specifications

Parameter Value
Manufacturer Shenzhen Fuman
Package SOT-23-6
Category Power Management ICs
Pins 6

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Reference voltage Vref 0.588 0.6 0.612 V 6
Input voltage range Vcc 2.6 5.5 V 6
Output current limit (fixed) Iocp 2 2.6 A 6
Adjustable current limit Iocp 0.5 1.5 A external resistor: 36K~100K 6
Supply voltage Vcc 0 6 V 2
LX voltage Vlx 0 16 V 2
EN, FB voltage 0 6 V 2
Power dissipation Pd 455 mW SOT23-6@Ta=25℃ 2
Junction temperature Tj 150 ℃ 2
Operating temperature Top -40 85 ℃ 2
Storage temperature Tst -65 150 ℃ 2
Lead temperature 260 ℃ soldering, 10 s 2
Thermal resistance θJA 220 ℃/W SOT23-6 2
Undervoltage lockout Vuvlo 2.2 V 6
UVLO hysteresis 0.1 V 6
Quiescent current Icc 0.17 mA VFB=0.66V, no switching 6
Supply current Icc 1.9 mA VFB=0.55V, switching 6
Shutdown current Icc 0.1 uA Ven=GND 6
Operating frequency Fosc 1.5 MHz Vfb=1.0V 6
Frequency change with voltage ∆f/∆v 5 % Vcc=2.6V~5.5V 6
Maximum duty cycle Tduty 90 % 6
Line regulation 0.05 %/V Vcc=2.6V~5.5V 6
Enable voltage Ven 0.96 V 6
Shutdown voltage Ven 0.6 V 6
Driver on-resistance Rds(on) 0.2 Ω Ilx=2A 6
Over-temperature protection Totp 150 ℃ 6

CAD (KiCad official)

  • Symbol: TC6291B
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-23-6 (KiCad packages3D, STEP)
  • 3D model files: tc6291b-etched.step / tc6291b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tc6291b.step / tc6291b.glb are the bare package body.

Provenance

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

  • Datasheet: Shenzhen Fuman datasheet (12 pp, sha256 1f5d7e05faf4d0b4, retrieved 2026-10-27, 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-sonnet-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