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TMI3181A

Public Made by Adom

by adom

TMI DC-DC Converters, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TMI3181A

TMI · DC-DC Converters · SOT-23-5

TMI3181A from TMI, in a SOT-23-5. 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 EN input Chip enable: drive above the EN high threshold to turn the part on and below the EN low threshold to turn it off; do not leave floating.
2 GND power_in Ground pin.
3 LX passive Power switch output, the switch node connection to the inductor.
4 VIN power_in Power supply input (2.5V to 6.5V), must be closely decoupled to GND with a 10µF or greater ceramic capacitor.
5 FB input Output voltage feedback pin, regulated to 0.6V reference through an external resistor divider.

Key specifications

Parameter Value
Manufacturer TMI
Package SOT-23-5
Category Power Supply Chip
Pins 5

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Input Voltage Range VIN 2.5 6.5 V VIN=5V, VOUT=1.2V, TA=25°C 4
Quiescent Current IQ 3 8 µA VEN=2.0V, VFB=VREFx105% 4
Shutdown Current 0.01 0.1 µA VEN=0V 4
Regulated Feedback Voltage VFB 0.588 0.6 0.612 V TA = 25°C 4
EN Rising Threshold Voltage 0.6 0.9 1.2 V VIN=5V 4
EN Leakage Current 0.01 0.5 µA 4
LX Leakage Current 0.01 1 µA VEN=0V, VIN=VLX=5V 4
OVP Threshold 7 V 4
OVP Hysteresis 0.24 V 4
UVLO Threshold 2.38 V 4
UVLO Hysteresis 0.28 V 4
Oscillation Frequency 1.2 MHz VFB=100% x VREF 4
Oscillation Frequency (short) 400 kHz VFB=0V 4
On Resistance of PMOS 0.3 Ω ILX=100mA 4
On Resistance of NMOS 0.15 Ω ILX=-100mA 4
Peak Current Limit 1.5 A normal operation 4
Peak Current Limit 1.2 A Hiccup mode 4
EN Hysteresis 0.12 V 4
Soft Start Time 270 µs 10% VOUT to 90% VOUT 4
Discharge Resistance on LX pin 200 Ω VEN=0V, VLX=0.1V 4
Thermal Shutdown Threshold 160 °C Note 4: guaranteed by design 4
Thermal Shutdown Hysteresis 25 °C Note 4: guaranteed by design 4
Input Supply Voltages -0.3 7 V 2
EN, LX Voltages -0.3 7 V 2
LX Voltage (<10ns transient) -3 7.5 V <10ns transient 2
LX Voltage (<5ns transient) -4 8 V <5ns transient 2
PG, FB Voltage -0.3 6 V 2
Storage Temperature Range -65 150 °C 2
Junction Temperature TJ -40 150 °C Note 2 2
Power Dissipation PD 600 mW 2
Lead Temperature Soldering 260 °C 10sec 2
Voltage Range VIN VIN 2.5 6.5 V 3
Operating Junction Temperature Range TJ -40 125 °C 3
Junction-to-ambient thermal resistance θJA 200 °C/W Measured on JESD51-7, 4-layer PCB 3
Junction-to-case thermal resistance θJC 65 °C/W Measured on JESD51-7, 4-layer PCB 3

CAD (KiCad official)

  • Symbol: TMI3181A
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: tmi3181a-etched.step / tmi3181a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tmi3181a.step / tmi3181a.glb are the bare package body.

Provenance

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

  • Datasheet: TMI datasheet (18 pp, sha256 8d8fc69e9a9aefac, retrieved 2026-10-22, tier: lcsc)
  • 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