component
MT3540-F25
Public Made by Adomby adom
Aerosemi DC-DC Converters, SOT-23-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
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
markdownMT3540-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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mt3540-f25.step/mt3540-f25.glbare 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).