# LM2576HVR-3.3

**HTC Korea TAEJIN Tech** · DC-DC Converters · TO-263-5

LM2576HVR-3.3 from HTC Korea TAEJIN Tech, 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 pin; operating supply voltage up to 60V (absolute maximum 63V). |
| 2 | VOUT | output | Switched regulator output voltage pin (3.3V fixed on this version); output to ground steady-state minimum -0.75V. |
| 3 | GND | power_in | Ground pin. |
| 4 | FB/ADJ | input | Output voltage feedback pin (output adjust on the adjustable version); connected to the regulated output on the fixed 3.3V version. |
| 5 | ON/OFF | input | Shutdown control input; TTL-compatible, pin voltage range -0.3V to VIN, high (about 5V) turns the regulator off into standby mode. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HTC Korea TAEJIN Tech |
| Package | TO-263-5 |
| Category | Power Management ICs |
| 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 | VO | 3.234 | 3.3 | 3.366 | V | LM2576HV-3.3, VIN =12V, ILOAD =0.5A | 4 |
| Output Voltage | VO | 3.168 | 3.3 | 3.45 | V | LM2576HV-3.3, 0.5A ≤ ILOAD ≤ 3A, 6V ≤ VIN ≤ 55V | 4 |
| Output Voltage (full temperature range) | VO | 3.135 |  | 3.482 | V | LM2576HV-3.3, 0.5A ≤ ILOAD ≤ 3A, 6V ≤ VIN ≤ 55V | 4 |
| Efficiency |  |  | 75 |  | % | LM2576HV-3.3, VIN =12V, ILOAD =3A | 4 |
| Oscillator Frequency | fO | 47 | 52 | 58 | kHZ | (Note 8) | 4 |
| Oscillator Frequency (full temperature range) | fO | 42 |  | 63 | kHZ | (Note 8) | 4 |
| Saturation Voltage | VSAT |  | 1.4 | 1.55 | V | IO = 3A (Note 4) | 4 |
| Saturation Voltage (full temperature range) | VSAT |  |  | 1.7 | V | IO = 3A (Note 4) | 4 |
| Max Duty Cycle (ON) | DC | 93 | 98 |  | % | (Note 5) | 4 |
| Current Limit | ICL | 4.2 | 5.8 | 6.9 | A | (Note 4, 8) | 4 |
| Current Limit (full temperature range) | ICL | 3.5 |  | 7.5 | A | (Note 4, 8) | 4 |
| Output Leakage Current | IL |  |  | 7.5 | mA | (Notes 6, 7) Output=0V | 5 |
| Quiescent Current | IQ |  | 5 | 10 | mA | (Note 6) | 5 |
| Standby Quiescent Current | ISTBY |  | 50 | 200 | uA | ON/OFF Pin = 5V (OFF), VIN = 60V | 5 |
| ON/OFF Pin Logic Input Level High | VIH | 2.2 | 1.4 |  | V | VO = 0V | 5 |
| ON/OFF Pin Logic Input Level High (full temperature range) | VIH | 2.4 |  |  | V | VO = 0V | 5 |
| ON/OFF Pin Logic Input Level Low | VIL |  | 1.2 |  | V | VO = Nominal Output Voltage | 5 |
| ON/OFF Pin Logic Input Level Low (other values) | VIL |  | 1 | 0.8 | V | VO = Nominal Output Voltage | 5 |
| ON/OFF Pin Input Current High | IIH |  | 12 | 30 | uA | ON/OFF Pin = 5V (OFF) | 5 |
| ON/OFF Pin Input Current Low | IIL |  | 0 | 10 | uA | ON/OFF Pin = 0V (ON) | 5 |
| Input Supply Voltage | VIN |  |  | 63 | V |  | 1 |
| ON/OFF Pin Input Voltage |  | -0.3 |  |  | V | max = +VIN | 1 |
| Output Voltage to Ground (Steady State) |  | -0.75 |  |  | V |  | 1 |
| Lead Temperature (Soldering, 5 sec) | TSOL |  |  | 260 | ℃ |  | 1 |
| Storage Temperature Range | TSTG | -65 |  | 150 | ℃ |  | 1 |
| Maximum Junction Temperature | TJOPR |  |  | 150 | ℃ |  | 1 |
| Supply Voltage | VIN |  |  | 60 | V | Operating Ratings | 2 |
| Operating Junction Temperature Range | TJ | -40 |  | 125 | ℃ | Operating Ratings | 2 |

## CAD (KiCad official)

- Symbol: `LM2576HVR-3.3`
- Footprint: `Package_TO_SOT_SMD:TO-263-5_TabPin6`
- 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files: `lm2576hvr-3-3-etched.step` / `lm2576hvr-3-3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2576hvr-3-3.step` / `lm2576hvr-3-3.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [HTC Korea TAEJIN Tech datasheet](docs/lm2576hvr-3-3-datasheet.pdf) (8 pp, sha256 `d07d513e4d37f22f`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-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).

[Datasheet PDF](docs/lm2576hvr-3-3-datasheet.pdf)