component
LM2670SX-3.3
Public Made by Adomby adom
Texas Instruments DC-DC Converters, TO-263-7. 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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README
markdownLM2670SX-3.3
Texas Instruments · DC-DC Converters · TO-263-7
LM2670SX-3.3 from Texas Instruments, in a TO-263-7. 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 | Switch_output | output | Source of the internal high-side FET and the switch node; connect to the inductor and the external Schottky diode cathode, with the ground-switch voltage limited to -1 V DC (short negative excursions to -10 V for 20 ns are allowed) and an absolute maximum of VIN. |
| 2 | Input | input | Supply input connected to the high-side FET drain, which must be kept within 8 V to 40 V (absolute maximum 45 V) and bypassed by a capacitor placed close to this pin. |
| 3 | CBOOST/CB | input | Bootstrap capacitor connection that is wired between this pin and the Switch_output pin to drive the internal MOSFET gate above VIN; the BOOST pin voltage is limited to VSW + 8 V. |
| 4 | GND | power_in | Power ground pin connected to system ground, which must be kept as close as practical to the CIN and COUT ground returns. |
| 5 | SYNC | input | Synchronization input for an external clock that must be higher than the internal oscillator frequency and lie in the 280 kHz to 400 kHz range; when left open the regulator switches at its internal 225 kHz to 280 kHz oscillator frequency. |
| 6 | Feedback/FB | input | Feedback sense input that connects to the output for the fixed-output versions or to the midpoint of the feedback divider for the ADJ version, and it must be shielded from inductor flux coupling. |
| 7 | ON/OFF | input | Enable input where a level above 1.4 V turns the regulator on and a level below 0.8 V shuts it down to a standby current of 50 µA, with a driven high level not to exceed the 6 V absolute maximum and the pin left open when unused. |
| 8 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TO-263-7 |
| Category | Power Management (PMIC) |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
LM2670SX-3.3 - Footprint:
Package_TO_SOT_SMD:TO-263-7_TabPin8 - 3D model: TO-263-7 (KiCad packages3D, STEP)
- 3D model files:
lm2670sx-3-3-etched.step/lm2670sx-3-3-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm2670sx-3-3.step/lm2670sx-3-3.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (42 pp, sha256
0dc7dd45c243f2c8, retrieved 2026-10-08, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).