component

MT3540-F25

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-f25: 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-f25-etched.fit.json mt3540-f25: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
mt3540-f25-etched.glb mt3540-f25: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
mt3540-f25-etched.step mt3540-f25: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
mt3540-f25.glb Publish 0.1.0 · Ray
mt3540-f25.kicad_mod Publish 0.1.0 · Ray
mt3540-f25.kicad_sym Publish 0.1.0 · Ray
mt3540-f25.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-f25.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-f25: specified limits as data (metadata.characteristics, 26 rows from the datasheet) · Ray
README.md mt3540-f25: specified limits as data (metadata.characteristics, 26 rows from the datasheet) · Ray

MT3540-F25

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

MT3540-F25 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 power_out Power switch output. Drain of the internal NMOS power switch (RDS(on) ≈ 0.5Ω, 1.5A current limit). Connects to the boost inductor and the anode of the Schottky rectifier; can swing between GND and 28V.
2 GND power_in Device ground and return for the internal power MOSFET. Tie to a solid ground plane close to the input/output capacitor grounds for best noise and thermal performance.
3 FB input Feedback input to the internal error amplifier. Regulates to VFB = 1.25V (MT3540-F25 variant). Drive with a resistor divider from VOUT: VOUT = 1.25V × (1 + R1/R2). Input bias current ≈ -10nA (typ).
4 EN input Regulator on/off control. Drive high (VIH ≥ 1.5V) to enable the converter; drive low (VIL ≤ 0.4V) to shut it down (IQ ≈ 0.1µA). Tie to VIN for always-on / automatic startup. Do not leave floating. Absolute max -0.3V to 6V.
5 VIN power_in Input supply pin, 2.5V to 5.5V operating range (absolute max 6V). Must be locally bypassed with a low-ESR ceramic capacitor (≥1µF, 10µF typical) placed close to the pin. UVLO ≈ 2.2V with 100mV hysteresis.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • 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
Under Voltage Lockout 2.2 2.45 V VIN=VEN=3.7V, TA=25°C (table default) 3
Shutdown Current 0.1 1 µA VEN = 0V 3
Quiescent Current (PFM) 40 60 µA VFB=1.4V, No switch 3
Quiescent Current (PWM) 0.6 1 mA VFB=1V, switch 3
Maximum Duty Cycle 90 % VFB = 0V 3
EN Input High Voltage 1.5 V 3
EN Input Low Voltage 0.4 V 3
FB Voltage (MT3540-F25, VFB=1.25V) 1.225 1.25 1.275 V VIN=VEN=3.7V, TA=25°C (table default) 3
FB Input Bias Current -50 -10 nA VFB = 1.2V 3
SW On Resistance 0.5 Ω 3
SW Current Limit 1.5 A VIN= 4.2V, Duty cycle=50% 3
SW Leakage 1 μA VSW = 20V 3
Switching Frequency 1.2 MHz 3
UVLO Hysteresis 100 mV 3
Thermal Shutdown 155 ℃ 3
Input Supply Voltage (absolute maximum) -0.3 6 V 2
EN, FB Voltages (absolute maximum) -0.3 6 V 2
SW Voltage (absolute maximum) -0.3 30 V 2
Power Dissipation 0.6 W 2
Junction Temperature 160 °C 2
Operating Temperature Range -40 85 °C 2
Storage Temperature Range -65 150 °C 2
ESD HBM (Human Body Model) 2 kV 2
Thermal Resistance junction-to-case θJC 130 °C/W 2
Thermal Resistance junction-to-ambient θJA 250 °C/W 2

CAD (KiCad official)

  • Symbol: MT3540-F25
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: mt3540-f25-etched.step / mt3540-f25-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mt3540-f25.step / mt3540-f25.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
mt3540-f25.step 85 KB You want the bare part, or you mark your own boards.
mt3540-f25-etched.step 1.8 MB You want the part with MT3540-F25 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 452 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 883fdc668f7ca165, 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