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TMI3343

Public Made by Adom

by adom

TMI DC-DC Converters, ESOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TMI3343

TMI · DC-DC Converters · ESOP-8

TMI3343 from TMI, in a ESOP-8. 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 BS passive High-side gate driver bootstrap pin supplying the high-side LDMOS gate driver; connect a 100nF capacitor between BS and SW.
2 IN power_in Power input pin, operating range 4.5V to 30V.
3 SW power_out Switch pin connected to the external inductor.
4 GND power_in Ground pin.
5 FB input Feedback pin with 0.8V reference threshold (784-816mV), used to set the output voltage through a resistor divider.
6 COMP passive External compensation pin for the peak current mode error amplifier output.
7 EN input Logic-high enables the IC and logic-low disables it into micro-power shutdown; must not be left floating and EN sink current must stay below 1mA.
8 SS passive Soft-start and tracking pin; an external capacitor sets the internal reference rise time and the pin voltage overrides the internal reference.
9 GND power_in Ground exposed pad; connect to the power ground copper area with copper and vias.

Key specifications

Parameter Value
Manufacturer TMI
Package ESOP-8
Category Power Supply Chip
Pins 9

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 Supply Voltage, SW -0.3 33 V 2
LX to GND (20ns transient) -5 35 V 20ns transient 2
BS to SW Voltage -0.3 6 V 2
All Other Pins (FB, EN, SS, COMP) Voltage -0.3 6 V 2
PG to GND -0.3 14 V 2
Junction Temperature TJ -40 150 °C 2
Storage Temperature Range -50 150 °C 2
Lead Temperature (Soldering, 10s) 260 °C Soldering, 10s 2
ESD Human Body Model VESD -2000 2000 V HBM for all pins, JEDEC JS-001 3
Voltage Range VIN 4.5 30 V 3
Junction-to-ambient thermal resistance θJA 60 °C/W 3
Input Voltage Range VIN 4.5 30 V VIN=12V, VOUT=5V, TA = 25°C 4
Under Voltage Lockout VUVLO 4.3 V VIN rising 4
UVLO Hysteresis VUVLO_HY 0.35 V 4
Input OVP Voltage VINOVP 32 V 4
Input Quiescent Current IQ 0.38 0.48 mA VFB=1V 4
Input Supply Current IIN 0.45 mA No load 4
Shutdown Current ISD 3 10 μA EN = 0V 4
Feedback Threshold Voltage VFBTH 784 800 816 mV PWM operation 4
FB Pin input current IFB -50 50 nA 4
EN Rising Threshold 1 1.15 1.3 V 4
EN Hysteresis 100 mV 4
EN sink current IEN_Sink 1 mA 4
Soft start Time TSS 1.2 ms CSS=NC 4
Soft start Time TSS 3.5 ms CSS=10nF 4
Current limit cycle-by-cycle ILIM_MAX 4.2 A 4
SW leakage ISW_LEAK 10 μA 4
Switch On-Resistance (high side) RDSONH 120 mΩ 4
Switch On-Resistance (low side) RDSONL 80 mΩ 4
Switching Frequency FSW 340 kHz 4
Minimum Turn-on Time TON_MIN 200 ns Guaranteed by design 4
Hiccup on Time 2 ms Guaranteed by design 4
Hiccup Time Before Restart 64 ms 4
Maximum Duty-cycle DMAX 91 % 4
Thermal Shutdown Threshold TSDN 160 °C Guaranteed by design 4
Thermal Shutdown Hysteresis TSDN_HY 10 °C Guaranteed by design 4

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts copper 3) Return FB, COMP and SS/RT to signal GND pin, and connect the signal GND to power GND at a single point for best noise immunity. Connect exposed pad to power ground copper area with copper and 9

CAD (KiCad official)

  • Symbol: TMI3343
  • Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm
  • 3D model: ESOP-8 (KiCad packages3D, STEP)
  • 3D model files: tmi3343-etched.step / tmi3343-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tmi3343.step / tmi3343.glb are the bare package body.

Provenance

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

  • Datasheet: TMI datasheet (15 pp, sha256 3bb21f4c0028d0af, 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