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LM2596S-ADJ-MS
Public Made by Adomby adom
MSKSEMI DC-DC Converters, TO-263-5L. 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
markdownLM2596S-ADJ-MS
MSKSEMI · DC-DC Converters · TO-263-5L
LM2596S-ADJ-MS from MSKSEMI, in a TO-263-5L. 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 | Positive input supply for the IC switching regulator; needs a suitable input bypass capacitor close to the pin, operating supply up to 40V for LM2596 (57V for HV). |
| 2 | Output | output | Internal switch output that swings between (+VIN − VSAT) and approximately −0.5V; keep connected PC board copper area minimal. |
| 3 | Gnd | power_in | Circuit ground. |
| 4 | Feedback | input | Senses the regulated output voltage to complete the feedback loop (1.230V typical reference on the adjustable version); absolute maximum −0.3V to +25V. |
| 5 | ON/OFF | input | Shutdown logic input, active low or floating turns regulator on; pulling above approximately 1.3V (max 25V) shuts it down to about 80 µA standby current. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | TO-263-5L |
| Category | Power Supply Chip |
| 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 (25C) | VFB | 1.193 | 1.23 | 1.267 | V | 4.5V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A, VOUT programmed for 3V, TJ=25C | 5 |
| Feedback Voltage (full temp range) | VFB | 1.18 | 1.28 | V | 4.5V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A, VOUT programmed for 3V, over operating temperature range | 5 | |
| Efficiency | 73 | % | VIN = 12V, VOUT = 3V, ILOAD = 3A | 5 | |||
| Feedback Bias Current (25C) | Ib | 10 | 50 | nA | Adjustable Version Only, VFB = 1.3V | 5 | |
| Feedback Bias Current (full temp range) | Ib | 100 | nA | Adjustable Version Only, VFB = 1.3V | 5 | ||
| Oscillator Frequency (25C) | fO | 127 | 150 | 173 | kHz | Note 6 | 5 |
| Oscillator Frequency (full temp range) | fO | 110 | 173 | kHz | Note 6 | 5 | |
| Saturation Voltage (25C) | VSAT | 1.16 | 1.4 | V | IOUT = 3A (Notes 7, 8) | 5 | |
| Saturation Voltage (full temp range) | VSAT | 1.5 | V | IOUT = 3A (Notes 7, 8) | 5 | ||
| Max Duty Cycle (ON) | DC | 100 | % | Note 8 | 5 | ||
| Min Duty Cycle (OFF) | DC | 0 | % | Note 9 | 5 | ||
| Current Limit (25C) | ICL | 3.6 | 4.5 | 6.9 | A | Peak Current (Notes 7, 8) | 5 |
| Current Limit (full temp range) | ICL | 3.4 | 7.5 | A | Peak Current (Notes 7, 8) | 5 | |
| Output Leakage Current | IL | 50 | µA | Output = 0V (Notes 7, 9) | 5 | ||
| Output Leakage Current | IL | 2 | 30 | mA | Output = −1V (Note 10) | 5 | |
| Quiescent Current | IQ | 5 | 10 | mA | Note 9 | 5 | |
| Standby Quiescent Current (25C) | ISTBY | 80 | 200 | µA | ON/OFF pin = 5V (OFF) (Note 10) | 5 | |
| Standby Quiescent Current (full temp range) | ISTBY | 250 | µA | ON/OFF pin = 5V (OFF) (Note 10) | 5 | ||
| ON/OFF Threshold Voltage Low (Regulator ON) | VIL | 1.3 | 0.6 | V | 5 | ||
| ON/OFF Threshold Voltage High (Regulator OFF) | VIH | 2 | 1.3 | V | 5 | ||
| ON/OFF Pin Input Current (Regulator OFF) | IH | 5 | 15 | µA | VLOGIC = 2.5V (Regulator OFF) | 6 | |
| ON/OFF Pin Input Current (Regulator ON) | IL | 0.02 | 5 | µA | VLOGIC = 0.5V (Regulator ON) | 6 | |
| Thermal Resistance Junction to Case | θJC | 2 | °C/W | TO-220 or TO-263 Package | 5 | ||
| Thermal Resistance Junction to Ambient | θJA | 50 | °C/W | TO-263, 0.5 in2 copper (Note 12) | 5 | ||
| Thermal Resistance Junction to Ambient | θJA | 30 | °C/W | TO-263, 2.5 in2 copper (Note 13) | 5 | ||
| Thermal Resistance Junction to Ambient | θJA | 20 | °C/W | TO-263, 3 in2 copper, double sided (Note 14) | 5 | ||
| Maximum Supply Voltage | 45 | V | LM2596 | 3 | |||
| ON/OFF Pin Input Voltage | -0.3 | 25 | V | 3 | |||
| Feedback Pin Voltage | -0.3 | 25 | V | 3 | |||
| Output Voltage to Ground | -1 | V | Steady State | 3 | |||
| Storage Temperature Range | -65 | 150 | °C | 3 | |||
| ESD Susceptibility | 2 | kV | Human Body Model | 3 | |||
| Maximum Junction Temperature | TJ | 150 | °C | 3 | |||
| Lead Temperature, Vapor Phase | 215 | °C | S Package, 60 sec | 3 | |||
| Lead Temperature, Infrared | 245 | °C | S Package, 10 sec | 3 | |||
| Operating Temperature Range | TJ | -40 | 125 | °C | 3 | ||
| Supply Voltage | 40 | V | LM2596 | 3 |
CAD (KiCad official)
- Symbol:
LM2596S-ADJ-MS - Footprint:
Package_TO_SOT_SMD:TO-263-5_TabPin6 - 3D model: TO-263-5L (KiCad packages3D, STEP)
- 3D model files:
lm2596s-adj-ms-etched.step/lm2596s-adj-ms-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm2596s-adj-ms.step/lm2596s-adj-ms.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MSKSEMI datasheet (19 pp, sha256
0157580195f9795e, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).