# LM4576R-5.0

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

LM4576R-5.0 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 | Positive input supply for the step-down regulator; a suitable input bypass capacitor (Cin) must be present to minimize voltage transients and supply the switching currents, with the datasheet giving a 40V maximum operating supply voltage and 45V absolute maximum. |
| 2 | VOUT | power_out | Emitter of the internal output switch with a typical saturation voltage VSAT of 1.4V, and the PCB area connected to this pin should be kept to a minimum to reduce coupling to sensitive circuitry. |
| 3 | GND | power_in | Circuit ground pin; refer to the datasheet's printed circuit board layout information for its connection. |
| 4 | FEEDBACK | input | Senses the regulated output voltage to close the feedback loop through the internal R1/R2 divider on fixed versions, and on the adjustable version it is the direct error amplifier input with R1/R2 connected externally (adjustable output range 1.23V to 37V). |
| 5 | ON/OFF | input | Logic-level shutdown input where a voltage above the typical 1.4V threshold (up to +Vin) shuts the regulator off, while a voltage below 1.4V or an open pin leaves the regulator on, with total input supply current dropping to approximately 60uA when off. |
| 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 (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 TJ=25°C | VOUT | 4.8 | 5 | 5.2 | V | 8V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A, TJ=25℃ | 6 |
| Output Voltage TJ=-40 to +125°C | VOUT | 4.75 |  | 5.25 | V | 8V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A, TJ=-40℃ ~ +125℃ | 6 |
| Oscillator Frequency TJ=25°C | FOSC | 255 | 300 | 345 | KHz | TJ=25℃ | 7 |
| Oscillator Frequency TJ=-40 to +125°C | FOSC | 230 |  | 370 | KHz | TJ=-40 to +125℃ | 7 |
| Saturation Voltage TJ=25°C | VSAT |  | 1.4 | 1.6 | V | IOUT=3.0A, TJ=25℃ | 7 |
| Saturation Voltage TJ=-40 to +125°C | VSAT |  |  | 1.8 | V | IOUT=3.0A, TJ=-40 to +125℃ | 7 |
| Max Duty Cycle | D/C | 93 | 98 |  | % | Max Duty Cycle ("0") | 7 |
| Current Limit TJ=25°C | ICL | 4 | 5.7 | 6.9 | A | Peak current, TJ=25℃ | 7 |
| Current Limit TJ=-40 to +125°C | ICL | 3.5 |  | 7.5 | A | Peak current, TJ=-40 to +125℃ | 7 |
| Output Leakage Current, Output = 0V | IL |  | 0.4 | 2 | mA | Output = 0V | 7 |
| Output Leakage Current, Output = -0.8V | IL |  | 10 | 30 | mA | Output = -0.8V | 7 |
| Quiescent Current | IQ |  | 5 | 10 | mA | TJ=25℃ | 7 |
| Standby Quiescent Current | ISTBY |  | 60 | 200 | µA | ON/OFF Pin = 5.0V ("off"), TJ=25℃ | 7 |
| ON/OFF Pin Logic Input Level High TJ=25°C | VIH | 2.2 | 1.4 |  | V | VOUT=0V, TJ=25℃ | 7 |
| ON/OFF Pin Logic Input Level High TJ=-40 to +125°C | VIH | 2.4 |  |  | V | VOUT=0V, TJ=-40 to +125℃ | 7 |
| ON/OFF Pin Input Current High (Regulator OFF) | IIH |  | 12 | 30 | µA | ON/OFF Pin = 5.0V (Regulator OFF), TJ=25℃ | 7 |
| ON/OFF Pin Input Current Low (Regulator ON) | IIL |  | 0 | 10 | µA | ON/OFF Pin = 0V (Regulator ON), TJ=25℃ | 7 |
| Maximum Supply Voltage | VIN |  |  | 45 | V |  | 5 |
| On/Off Pin Input Voltage | VON/OFF | -0.3 |  |  | V | -0.3V ≤ V ≤ +Vin | 5 |
| FB Pin Voltage | VFB | -0.3 |  |  | V | -0.3V ≤ V ≤ +Vin | 5 |
| Output Voltage to Ground (Steady-State) | VOUT | -0.8 |  |  | V | Steady-state | 5 |
| Thermal Resistance Junction to Ambient (TO-263-5L) | θJA |  | 70 |  | ℃/W | TO-263-5L | 5 |
| Thermal Resistance Junction to Case (TO-263-5L) | θJC |  | 5 |  | ℃/W | TO-263-5L | 5 |
| Maximum Junction Temperature | TJ |  |  | 150 | ℃ |  | 5 |
| Storage Temperature Range | TSTG | -65 |  | 150 | ℃ |  | 5 |
| Operating Junction Temperature Range | TJ | -40 |  | 125 | ℃ |  | 5 |
| Maximum Supply Voltage (operating) | VIN |  |  | 40 | V |  | 5 |
| Output Current | IOUT |  |  | 3 | A |  | 5 |

## CAD (KiCad official)

- Symbol: `LM4576R-5.0`
- Footprint: `Package_TO_SOT_SMD:TO-263-5_TabPin6`
- 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files: `lm4576r-5-0-etched.step` / `lm4576r-5-0-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4576r-5-0.step` / `lm4576r-5-0.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HTC Korea TAEJIN Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588913158627344384) (9 pp, sha256 `15b8d92e46dd03cc`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/lm4576r-5-0-datasheet.pdf)