component
TMI3331
Public Made by Adomby adom
TMI DC-DC Converters, ESOP-8. Pinout cross-checked by two models against 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
markdownTMI3331
TMI · DC-DC Converters · ESOP-8
TMI3331 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 | power_in | High-side gate driver bias pin that supplies the high-side LDMOS gate driver, requiring a 100nF capacitor between BS and SW (absolute maximum BS-to-SW voltage is -0.3 to 6 V). |
| 2 | IN | power_in | Power input pin, with a recommended operating voltage range of 8 V to 30 V and an absolute maximum of 36 V for surge conditions. |
| 3 | SW | output | Switch pin that connects to the external inductor; the absolute maximum SW voltage is -0.3 to 36 V. |
| 4 | GND | power_in | Power ground pin for the converter. |
| 5 | FB | input | Output voltage feedback pin that regulates to an internal 0.8 V reference (784 mV to 816 mV), with input current limited to ±50 nA. |
| 6 | CS | input | Output current sense pin for constant current limit; the CC current is set by a resistor Rcs between CS and GND, giving ILIM = 61.7 mV / Rcs, and CS can be tied to GND to use the internal cycle-by-cycle peak current limit. |
| 7 | EN | input | Enable pin, with a logic high threshold of at least 1.5 V and a logic low threshold of at most 0.3 V. |
| 8 | FSW | input | Switching frequency set pin; a resistor sets the frequency from 130 kHz (floating) to 500 kHz (shorted to GND), with RFSW = 300 kΩ giving 310 kHz typical. |
| 9 | GND | power_in | Ground exposed pad that must be connected to the power ground copper area with copper and vias for heat dissipation and noise immunity. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | TMI |
| Package | ESOP-8 |
| Category | Power Management (PMIC) |
| 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 Voltage Range | VIN | 8 | 30 | V | 5 | ||
| Shut-down Current | ISD | 6 | 10 | uA | EN=0V | 5 | |
| Standby Supply Current of TMI3331 | ISTBY | 10 | 15 | mA | VOUT=5V, No Load | 5 | |
| Feedback Threshold Voltage | VFBTH | 784 | 800 | 816 | mV | 5 | |
| FB Pin Input Current | IFB | -50 | 50 | nA | 5 | ||
| Input OVP Voltage | VINOVP | 31.5 | V | 5 | |||
| Output OVP Voltage | VOUTOVP | 10 | 20 | % | 5 | ||
| Input Voltage Range | VIN | 8 | 30 | V | 4 | ||
| Operating Junction Temperature Range | TJ | -40 | 125 | °C | 4 | ||
| IN, SW and EN Voltages | -0.3 | 36 | V | 3 | |||
| BS to SW Voltages | -0.3 | 6 | V | 3 | |||
| All other pins Voltage | -0.3 | 6 | V | 3 | |||
| Junction Temperature | TJ | -40 | 150 | °C | Note 2 | 3 | |
| Storage Temperature | -65 | 150 | °C | 3 | |||
| Package Dissipation | 2 | W | 3 | ||||
| Junction-to-ambient Thermal Resistance | θJA | 60 | °C/W | 3 | |||
| Junction-to-case Thermal Resistance | θJC | 46 | °C/W | 3 | |||
| Under Voltage Lockout | VUVLO | 7.2 | V | VIN rising | 5 | ||
| UVLO Hysteresis | VUVLO_HY | 0.6 | V | 5 | |||
| Quiescent Supply Current | ICCQ | 1 | mA | no load, VFB > 0.83V | 5 | ||
| Soft start Time | TSST | 4 | ms | 5 | |||
| CS Current Limit Voltage | VLIM_CS | 61.7 | mV | 5 | |||
| SW leakage | ISW_LEAK | 10 | uA | 5 | |||
| Maximum Duty Cycle | DDUTY | 90 | % | FS=300kHz | 5 | ||
| Switching Frequency | FS | 310 | kHz | RFSW=300kΩ | 5 | ||
| Switching Frequency | FS | 130 | kHz | FSW pin floating | 5 | ||
| Switching Frequency | FS | 500 | kHz | FSW short to GND | 5 | ||
| Switch On-Resistance (H side) | RON_HS | 80 | mΩ | By design | 5 | ||
| Switch On-Resistance (L side) | RON_LS | 60 | mΩ | By design | 5 | ||
| Short circuit Frequency | FSC | 35 | kHz | VFB=0V | 5 | ||
| Minimum Turn-on Time | TON_MIN | 200 | ns | 5 | |||
| EN High Level Input Voltage | VEN_H | 1.5 | V | 5 | |||
| EN Low Level Input Voltage | VEN_L | 0.3 | V | 5 | |||
| Thermal Shutdown Threshold | TSDN | 155 | °C | Note 3 (guaranteed by design) | 5 | ||
| Thermal Shutdown Hysteresis | TSDN_HY | 20 | °C | Note 3 (guaranteed by design) | 5 |
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 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 vias. | 8 |
CAD (KiCad official)
- Symbol:
TMI3331 - Footprint:
Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm - 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files:
tmi3331-etched.step/tmi3331-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tmi3331.step/tmi3331.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: TMI datasheet (12 pp, sha256
2839d7b5e08d9017, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).