# LM4576DP-5.0

**HTC Korea TAEJIN Tech** · DC-DC Converters · SOIC-8-EP

LM4576DP-5.0 from HTC Korea TAEJIN Tech, in a SOIC-8-EP. 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 LM4576 step-down switching regulator, which needs a suitable input bypass capacitor (Cin) to minimize voltage transients and supply switching currents. |
| 2 | VOUT | power_out | Emitter of the internal output switch with a typical saturation voltage VSAT of 1.4V, and the PCB area on this pin should be kept to a minimum to reduce coupling to sensitive circuitry. |
| 3 | FEEDBACK | input | Senses the regulated output voltage through the internal divider R1/R2 to the error amplifier; in the adjustable version it is the direct error amplifier input and R1/R2 are external to set the output voltage. |
| 4 | ON/OFF | input | Logic-level shutdown input with a typical threshold of 1.4V, where a voltage above this value (up to +Vin) shuts the regulator off and a voltage below 1.4V or an open pin leaves it on. |
| 5 | N.C. | unconnected | No connect. |
| 6 | GND | power_in | Circuit ground pin; the exposed pad of the SOP8-PP package should be externally connected to this GND. |
| 7 | N.C. | unconnected | No connect. |
| 8 | N.C. | unconnected | No connect. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HTC Korea TAEJIN Tech |
| Package | SOIC-8-EP |
| Category | Power Management ICs |
| Pins | 9 |

## 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 | VOUT | 4.8 | 5 | 5.2 | V | 8V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A, TJ=25℃ | 6 |
| Output Voltage | VOUT | 4.75 |  | 5.25 | V | 8V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A, TJ= -40℃ ~ +125℃ | 6 |
| Oscillator Frequency | FOSC | 255 | 300 | 345 | KHz | TJ=25℃ | 7 |
| Oscillator Frequency | FOSC | 230 |  | 370 | KHz | TJ= -40 to +125℃ | 7 |
| Current Limit (Peak Current) | ICL | 4 | 5.7 | 6.9 | A | TJ= 25℃ | 7 |
| Current Limit (Peak Current) | ICL | 3.5 |  | 7.5 | A | TJ= -40 to +125℃ | 7 |
| Saturation Voltage | VSAT |  | 1.4 | 1.6 | V | IOUT=3.0A, TJ= 25℃ | 7 |
| Saturation Voltage | VSAT |  |  | 1.8 | V | IOUT=3.0A, TJ= -40 to +125℃ | 7 |
| Max Duty Cycle | D/C | 93 | 98 |  | % | Feedback pin removed from output and connected to 0V | 7 |
| Output Leakage Current | IL |  | 0.4 | 2 | mA | Output = 0V | 7 |
| Output Leakage Current | 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 | VIH | 2.2 |  |  | V | TJ=25℃ | 7 |
| ON/OFF Pin Logic Input Level High | VIH | 1.4 |  |  | V | TJ= -40 to +125℃ | 7 |
| ON/OFF Pin Logic Input Level Low | VIL |  |  | 1.2 | V | VOUT=Nominal Output Voltage, TJ=25℃ | 7 |
| ON/OFF Pin Logic Input Level Low | VIL |  |  | 0.8 | V | VOUT=Nominal Output Voltage, TJ= -40 to +125℃ | 7 |
| ON/OFF Pin Input Current High | IIH |  | 12 | 30 | µA | ON/OFF Pin = 5.0V (Regulator OFF), TJ=25℃ | 7 |
| ON/OFF Pin Input Current Low | IIL |  | 0 | 10 | µA | ON/OFF Pin = 0V (Regulator ON), TJ=25℃ | 7 |
| Efficiency | η |  | 75 |  | % | VIN=12V, ILOAD=3A, VOUT=5V | 6 |
| 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 |  | 5 |
| Storage Temperature Range | TSTG | -65 |  | 150 | ℃ |  | 5 |
| Maximum Junction Temperature | TJ |  |  | 150 | ℃ |  | 5 |
| Operating Junction Temperature Range | TJ | -40 |  | 125 | ℃ |  | 5 |
| Maximum Supply Voltage | VIN |  |  | 40 | V |  | 5 |
| Output Current | IOUT |  |  | 3 | A |  | 5 |

## CAD (KiCad official)

- Symbol: `LM4576DP-5.0`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm`
- 3D model: SOIC-8-EP (KiCad packages3D, STEP)
- 3D model files: `lm4576dp-5-0-etched.step` / `lm4576dp-5-0-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4576dp-5-0.step` / `lm4576dp-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](docs/lm4576dp-5-0-datasheet.pdf) (9 pp, sha256 `80f5b11e87d5dda2`, retrieved 2026-10-28, 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/lm4576dp-5-0-datasheet.pdf)