component
SIT2596S-ADJ
Public Made by Adomby adom
SIT DC-DC Converters, TO-263-5. 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
markdownSIT2596S-ADJ
SIT · DC-DC Converters · TO-263-5
SIT2596S-ADJ from SIT, in a TO-263-5. 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 | VIN | power_in | DC voltage input with a maximum of 40V and a minimum of 4.5V. |
| 2 | Output | power_out | Switching tube emitter open output that connects to the inductor and free-wheeling diode to form the step-down circuit, with output up to 37V and minimum 1.2V. |
| 3 | Ground | power_in | Ground connection. |
| 4 | Feed Back | input | Stabilized sample voltage input, generally connected to the output voltage, compared against the internal 1.23V reference to regulate the output. |
| 5 | ON/OFF | input | Enable control: above 1.3V (maximum 25V) turns the output off to 0V, below 1.3V the output is at its rated value, and it may be left open or tied to GND if not used. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | SIT |
| Package | TO-263-5 |
| Category | Power Management (PMIC) |
| Pins | 6 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Feedback voltage | VFB | 1.193 | 1.23 | 1.267 | V | 4.5V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A, VOUT = 3V | 7 |
| Feedback bias current | ID | 15 | 50 | nA | VFB = 1.3V | 7 | |
| Efficiency | η | 73 | % | VOUT = 3V, ILOAD = 3A | 7 | ||
| Oscillator frequency | fO | 127 | 150 | 173 | kHz | 7 | |
| Saturation voltage | VSAT | 1.26 | 1.4 | V | IOUT = 3A (Note 1,2) | 7 | |
| Max duty cycle (ON) | DC | 100 | % | (Note 2) | 7 | ||
| Min duty cycle (OFF) | DC | 0 | % | (Note 3) | 7 | ||
| Current limit | ICL | 3.4 | 4.5 | 6 | A | Peak current (Note 1,2) | 7 |
| Output leakage current | IL | 25 | μA | Output =0V (Note 1, 3) | 7 | ||
| Output leakage current | IL | 1 | 10 | mA | Output = -1V, VIN = 40V | 7 | |
| Quiescent current | IQ | 5 | 10 | mA | (Note 3) | 7 | |
| Standby quiescent current | ISTBY | 100 | 200 | μA | ON/OFF pin = 5V (OFF), VIN = 40V | 7 | |
| ON/OFF pin logic input threshold voltage | VIH | 0.6 | V | Low (regulator ON) | 7 | ||
| ON/OFF pin logic input threshold voltage | VIL | 2 | V | High (regulator OFF) | 7 | ||
| ON/OFF pin input current | IH | 5 | 15 | μA | VLOGIC = 2.5V (regulator OFF) | 7 | |
| ON/OFF pin input current | IL | 5 | μA | VLOGIC = 0.5V (regulator ON) | 7 | ||
| Thermal resistance junction to package surface | RθJC(top) | 2 | ℃/W | Chip junction to package surface | 6 |
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 | close to the IC, at the same time, the capacitor pin should be short, the connected copper wire should be | 9 |
CAD (KiCad official)
- Symbol:
SIT2596S-ADJ - Footprint:
Package_TO_SOT_SMD:TO-263-5_TabPin6 - 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files:
sit2596s-adj-etched.step/sit2596s-adj-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sit2596s-adj.step/sit2596s-adj.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: SIT datasheet (30 pp, sha256
19aef5d637633418, retrieved 2026-10-27, 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).