component
LM2576S-3.3
Public Made by Adomby adom
UMW 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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README
markdownLM2576S-3.3
UMW · DC-DC Converters · TO-263-5
LM2576S-3.3 from UMW, 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 | Input supply voltage: operating range is 4.5V to 40V for LM2576 (4.5V to 60V for LM2576HV), with absolute maximum supply voltage of 45V for LM2576 (63V for LM2576HV). |
| 2 | Output | output | Switching output that drives the inductor and catch diode, rated for 3A guaranteed output current, with output voltage to ground (steady state) not below -1V. |
| 3 | GND | power_in | Ground reference pin; single-point or ground-plane grounding is recommended for best regulation and minimal ground-loop noise. |
| 4 | Feedback | input | Output voltage feedback input that regulates to the internal 1.23V reference, with feedback bias current of 100/500 nA maximum. |
| 5 | ON/OFF | input | TTL shutdown input that is active when low or floating and turns the regulator off when driven high (VIH 2.2/2.4V min, VIL 1.0/0.8V max), with about 50 µA standby current in shutdown. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| 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 |
|---|---|---|---|---|---|---|---|
| Output voltage, 3.3V version (VIN=12V, ILOAD=0.5A) | VOUT | 3.234 | 3.3 | 3.366 | V | VIN=12V, ILOAD=0.5A, Circuit of Figure 2 | 5 |
| Output voltage, 3.3V version (line and load, LM2576) | VOUT | 3.135 | 3.3 | 3.465 | V | 6V≤VIN≤40V, 0.5A≤ILOAD≤3A, Circuit of Figure 2 | 5 |
| Oscillator frequency | fO | 47 | 52 | 58 | kHz | Unless otherwise specified: VIN=12V (3.3V version), ILOAD=500mA | 8 |
| Saturation voltage | VSAT | 1.4 | 2 | V | IOUT=3A (Note 4) | 8 | |
| Max duty cycle (ON) | DC | 93 | 98 | % | Unless otherwise specified: VIN=12V (3.3V version), ILOAD=500mA | 8 | |
| Current limit | ICL | 3.5 | 5.8 | 7.5 | A | Unless otherwise specified: VIN=12V (3.3V version), ILOAD=500mA | 8 |
| Feedback bias current | IB | 50 | 500 | nA | Unless otherwise specified: VIN=12V (3.3V version), ILOAD=500mA | 8 | |
| Standby quiescent current | ISTBY | 50 | 200 | µA | ON/OFF pin=5V (OFF) | 8 | |
| ON/OFF pin logic input level high | VIH | 2.4 | 1.4 | V | VOUT=0V | 9 | |
| ON/OFF pin logic input level low | VIL | 1.2 | 0.8 | V | VOUT=Nominal Output Voltage | 9 | |
| ON/OFF pin input current high | IIH | 12 | 30 | µA | ON/OFF Pin=5V(OFF) | 9 | |
| ON/OFF pin input current low | IIL | 0 | 10 | µA | ON/OFF Pin=0V(ON) | 9 | |
| Minimum supply voltage (LM2576) | 45 | V | 4 | ||||
| ON/OFF pin input voltage | -0.3 | V | Printed as -0.3 ≤ V ≤ +VIN | 4 | |||
| Output voltage to ground (steady state) | -1 | V | Steady state | 4 | |||
| Storage temperature range | -65 | 150 | °C | 4 | |||
| Maximum junction temperature | 150 | °C | 4 | ||||
| Minimum ESD rating | 2 | kV | C=100pF, R=1.5kΩ | 4 | |||
| Lead temperature (soldering) | 260 | °C | Soldering, 10 seconds | 4 | |||
| Operating junction temperature range (LM2576) | TJ | -40 | 125 | °C | Temperature Range (LM2576/LM2576HV) | 4 | |
| Supply voltage (LM2576) | 4.5 | 40 | V | 4 |
CAD (KiCad official)
- Symbol:
LM2576S-3.3 - Footprint:
Package_TO_SOT_SMD:TO-263-5_TabPin6 - 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files:
lm2576s-3-3-etched.step/lm2576s-3-3-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm2576s-3-3.step/lm2576s-3-3.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UMW datasheet (18 pp, sha256
10275fb18a78ad8b, retrieved 2026-10-17, 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).