component

MT3540

Public Made by Adom

by adom

Aerosemi DC-DC Converters, 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 mt3540: 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
mt3540-etched.fit.json mt3540: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
mt3540-etched.glb mt3540: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
mt3540-etched.step mt3540: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
mt3540.glb Publish 0.1.0 · Ray
mt3540.kicad_mod Publish 0.1.0 · Ray
mt3540.kicad_sym Publish 0.1.0 · Ray
mt3540.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
mt3540.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 mt3540: specified limits as data (metadata.characteristics, 26 rows from the datasheet) · Ray
README.md mt3540: specified limits as data (metadata.characteristics, 26 rows from the datasheet) · Ray

MT3540

Aerosemi · DC-DC Converters · SOT-23-5

MT3540 from Aerosemi, 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 SW output Power switch output - drain of the internal 0.5Ω, 1.5A N-channel power MOSFET. Connect the boost inductor and Schottky rectifier here. Node swings between GND and up to 28V; absolute max 30V. Keep the SW copper area small to minimize EMI.
2 GND power_in Ground return for the IC and the internal power MOSFET source. Tie to a solid ground plane for heat sinking and low-noise operation.
3 FB input Feedback input to the internal error amplifier. Regulates to VREF = 1.20V (MT3540), 1.23V (-F23) or 1.25V (-F25). Set VOUT with a resistor divider: VOUT = VREF × (1 + R1/R2). Bias current ≈ −10nA (max −50nA). Absolute max −0.3V to 6V.
4 EN input Enable / on-off control. VIH ≥ 1.5V turns the converter on; VIL ≤ 0.4V shuts it down (IQ ≈ 0.1µA). Tie to VIN for automatic startup when unused. Absolute max −0.3V to 6V.
5 VIN power_in Input supply pin, 2.5V to 5.5V (absolute max 6V). UVLO ≈ 2.2V with 100mV hysteresis. Must be locally bypassed with a low-ESR ceramic capacitor (1µF or larger, X5R/X7R) close to the pin.

Key specifications

Parameter Value
Manufacturer Aerosemi
Package SOT-23-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • MT3540
  • MT3540-F23
  • MT3540-F25

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Operating Input Voltage 2.5 5.5 V 3
FB Voltage (MT3540, VFB=1.20V) VFB 1.176 1.2 1.224 V 3
Under Voltage Lockout 2.2 2.45 V 3
Quiescent Current (PFM) 40 60 µA VFB=1.4V, No switch 3
Quiescent Current (PWM) 0.6 1 mA VFB=1V, switch 3
Current (Shutdown) 0.1 1 µA VEN = 0V 3
FB Input Bias Current -50 -10 nA VFB = 1.2V 3
SW Leakage 1 µA VSW = 20V 3
EN Input High Voltage 1.5 V 3
EN Input Low Voltage 0.4 V 3
Maximum Duty Cycle 90 % VFB = 0V 3
Switching Frequency 1.2 MHz 3
SW On Resistance 0.5 Ω 3
SW Current Limit 1.5 A VIN= 4.2V, Duty cycle=50% 3
Under Voltage Lockout Hysteresis 100 mV 3
Thermal Shutdown 155 ℃ 3
Input Supply Voltage (absolute max) VIN -0.3 6 V 2
EN, FB Voltages (absolute max) -0.3 6 V 2
SW Voltage (absolute max) VSW -0.3 30 V 2
Power Dissipation PD 0.6 W 2
Junction Temperature TJ 160 °C 2
Storage Temperature Range -65 150 °C 2
ESD HBM (Human Body Model) 2 kV 2
Operating Temperature Range -40 85 °C 2
Thermal Resistance θJC θJC 130 °C/W 2
Thermal Resistance θJA θJA 250 °C/W 2

CAD (KiCad official)

  • Symbol: MT3540
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: mt3540-etched.step / mt3540-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mt3540.step / mt3540.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
mt3540.step 85 KB You want the bare part, or you mark your own boards.
mt3540-etched.step 1.3 MB You want the part with MT3540 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 329 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: Aerosemi datasheet (8 pp, sha256 e4331b29563556e7, 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