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LM2594M-3.3
Public Made by Adomby adom
HGSEMI DC-DC Converters, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LM2594M-3.3
HGSEMI · DC-DC Converters · SOP-8
LM2594M-3.3 from HGSEMI, in a SOP-8. 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 | NC | unconnected | No function; this pin is a no-function (NC) pin per the datasheet pin table. |
| 2 | NC | unconnected | No function; this pin is a no-function (NC) pin per the datasheet pin table. |
| 3 | NC | unconnected | No function; this pin is a no-function (NC) pin per the datasheet pin table. |
| 4 | FEEDBACK | input | Voltage feedback pin that monitors the output voltage through a resistor divider network and regulates it, with a feedback threshold voltage of 1.23V. |
| 5 | ON_OFF | input | Enable/shutdown pin: a high level shuts the chip off and a low level enables it, with thresholds of 1.4V (high, control off) and 0.8V (low, control on), and the pin defaults to low when floating. |
| 6 | GND | power_in | Ground pin that should be routed on the ground return path away from the Schottky diode output point to keep switching-current spike noise out of the regulator. |
| 7 | VIN | power_in | Supply input that requires a DC supply of 4.5V to 40V (60V for the HV versions), with a large-value capacitor connected between VIN and ground to suppress supply noise. |
| 8 | OUTPUT | output | Power switch output pin that is the switching node supplying the output load. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
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 regulation voltage (LM2594-3.3) | VOUT | 3.168 | 3.3 | 3.432 | V | VIN=4.75V～40V, ILOAD=0.2A～1A | 3 |
| Input operating voltage (LM2594) | VIN | 4.5 | 40 | V | 4 | ||
| Standby current | ISTBY | 80 | 200 | uA | VON_OFF=5V | 4 | |
| Quiescent operating current | IQ | 2 | 10 | mA | VON_OFF=0V, VFB=VIN | 4 | |
| Operating frequency | FOSC | 127 | 150 | 173 | kHz | 4 | |
| Current limit | IL | 3.6 | 4.8 | 6.9 | A | VFB=0 | 4 |
| ON/OFF pin threshold voltage (control-off, high level) | VON_OFF | 1.4 | V | 4 | |||
| ON/OFF pin threshold voltage (control-on, low level) | VON_OFF | 0.8 | V | 4 | |||
| ON/OFF pin leakage current (OFF) | IH | 5 | 30 | µA | VON_OFF=2.5V(OFF) | 4 | |
| ON/OFF pin leakage current (ON) | IL | 0.2 | 10 | µA | VON_OFF=0.5V(ON) | 4 | |
| Saturation voltage | VCE | 1.3 | 1.5 | V | VFB=0V, LOUT=1A | 4 | |
| Maximum duty cycle | DMAX | 100 | % | CFB=0V | 4 | ||
| Input voltage (recommended, LM2594) | VIN | 5 | 40 | V | 2 | ||
| Operating junction temperature (recommended) | TJ | -40 | 125 | ℃ | 2 | ||
| Input supply voltage (absolute maximum, LM2594) | VIN | 40 | V | 2 | |||
| Feedback pin voltage (absolute maximum) | VFB | -0.3 | V | upper limit printed as VIN | 2 | ||
| ON/OFF pin voltage (absolute maximum) | VON_OFF | -0.3 | V | upper limit printed as VIN | 2 | ||
| Power switch output pin voltage (absolute maximum) | VOUT PUT | -0.3 | V | upper limit printed as VIN | 2 | ||
| Operating junction temperature (absolute maximum) | TJ | -40 | 125 | ℃ | 2 | ||
| Storage temperature | TSTG | -65 | 150 | ℃ | 2 | ||
| Lead soldering temperature | TLEAD | 260 | ℃ | 10 s | 2 | ||
| ESD capability (human body model) | ESD | 2000 | V | Human body model | 2 | ||
| Thermal resistance junction-to-ambient | RJA | 150 | ℃/W | 4 |
CAD (KiCad official)
- Symbol:
LM2594M-3.3 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
lm2594m-3-3-etched.step/lm2594m-3-3-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm2594m-3-3.step/lm2594m-3-3.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HGSEMI datasheet (12 pp, sha256
373bc39e42880ae7, retrieved 2026-10-17, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).
# LM2594M-3.3
**HGSEMI** · DC-DC Converters · SOP-8
LM2594M-3.3 from HGSEMI, in a SOP-8. 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 | NC | unconnected | No function; this pin is a no-function (NC) pin per the datasheet pin table. |
| 2 | NC | unconnected | No function; this pin is a no-function (NC) pin per the datasheet pin table. |
| 3 | NC | unconnected | No function; this pin is a no-function (NC) pin per the datasheet pin table. |
| 4 | FEEDBACK | input | Voltage feedback pin that monitors the output voltage through a resistor divider network and regulates it, with a feedback threshold voltage of 1.23V. |
| 5 | ON_OFF | input | Enable/shutdown pin: a high level shuts the chip off and a low level enables it, with thresholds of 1.4V (high, control off) and 0.8V (low, control on), and the pin defaults to low when floating. |
| 6 | GND | power_in | Ground pin that should be routed on the ground return path away from the Schottky diode output point to keep switching-current spike noise out of the regulator. |
| 7 | VIN | power_in | Supply input that requires a DC supply of 4.5V to 40V (60V for the HV versions), with a large-value capacitor connected between VIN and ground to suppress supply noise. |
| 8 | OUTPUT | output | Power switch output pin that is the switching node supplying the output load. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
## 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 regulation voltage (LM2594-3.3) | VOUT | 3.168 | 3.3 | 3.432 | V | VIN=4.75V～40V, ILOAD=0.2A～1A | 3 |
| Input operating voltage (LM2594) | VIN | 4.5 | | 40 | V | | 4 |
| Standby current | ISTBY | | 80 | 200 | uA | VON_OFF=5V | 4 |
| Quiescent operating current | IQ | | 2 | 10 | mA | VON_OFF=0V, VFB=VIN | 4 |
| Operating frequency | FOSC | 127 | 150 | 173 | kHz | | 4 |
| Current limit | IL | 3.6 | 4.8 | 6.9 | A | VFB=0 | 4 |
| ON/OFF pin threshold voltage (control-off, high level) | VON_OFF | 1.4 | | | V | | 4 |
| ON/OFF pin threshold voltage (control-on, low level) | VON_OFF | | | 0.8 | V | | 4 |
| ON/OFF pin leakage current (OFF) | IH | | 5 | 30 | µA | VON_OFF=2.5V(OFF) | 4 |
| ON/OFF pin leakage current (ON) | IL | | 0.2 | 10 | µA | VON_OFF=0.5V(ON) | 4 |
| Saturation voltage | VCE | | 1.3 | 1.5 | V | VFB=0V, LOUT=1A | 4 |
| Maximum duty cycle | DMAX | | 100 | | % | CFB=0V | 4 |
| Input voltage (recommended, LM2594) | VIN | 5 | | 40 | V | | 2 |
| Operating junction temperature (recommended) | TJ | -40 | | 125 | ℃ | | 2 |
| Input supply voltage (absolute maximum, LM2594) | VIN | | | 40 | V | | 2 |
| Feedback pin voltage (absolute maximum) | VFB | -0.3 | | | V | upper limit printed as VIN | 2 |
| ON/OFF pin voltage (absolute maximum) | VON_OFF | -0.3 | | | V | upper limit printed as VIN | 2 |
| Power switch output pin voltage (absolute maximum) | VOUT PUT | -0.3 | | | V | upper limit printed as VIN | 2 |
| Operating junction temperature (absolute maximum) | TJ | -40 | | 125 | ℃ | | 2 |
| Storage temperature | TSTG | -65 | | 150 | ℃ | | 2 |
| Lead soldering temperature | TLEAD | | | 260 | ℃ | 10 s | 2 |
| ESD capability (human body model) | ESD | 2000 | | | V | Human body model | 2 |
| Thermal resistance junction-to-ambient | RJA | | 150 | | ℃/W | | 4 |
## CAD (KiCad official)
- Symbol: `LM2594M-3.3`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `lm2594m-3-3-etched.step` / `lm2594m-3-3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2594m-3-3.step` / `lm2594m-3-3.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [HGSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8755852903586107392) (12 pp, sha256 `373bc39e42880ae7`, retrieved 2026-10-17, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/lm2594m-3-3-datasheet.pdf)