# LM2594HVN-ADJ

**Texas Instruments** · DC-DC Converters · PDIP-8

LM2594HVN-ADJ from Texas Instruments, in a PDIP-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 internal connection is made to this pin. |
| 2 | NC | unconnected | No internal connection is made to this pin. |
| 3 | NC | unconnected | No internal connection is made to this pin. |
| 4 | Feedback | input | Senses the regulated output voltage to complete the feedback loop, with the Feedback pin voltage limited to −0.3 V to 25 V. |
| 5 | ON/OFF | input | Pulling this pin below about 1.3 V turns the regulator on and pulling it above 1.3 V (up to a maximum of 25 V) shuts it down, and leaving it open or tying it to ground keeps the regulator on. |
| 6 | Ground | power_in | Circuit ground for the IC. |
| 7 | +VIN | power_in | Positive input supply for the switching regulator, rated 4.5 V to 60 V for the LM2594HV, and it needs a suitable input bypass capacitor. |
| 8 | Output | output | Internal switch output that swings between (+VIN − VSAT) and approximately −0.5 V, and its PCB copper area must be kept to a minimum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | PDIP-8 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply voltage |  |  |  | 60 | V | LM2594HV | 4 |
| ON/OFF pin input voltage |  | -0.3 |  | 25 | V |  | 4 |
| Feedback pin voltage |  | -0.3 |  | 25 | V |  | 4 |
| Output voltage to ground (steady state) |  | -1 |  |  | V | steady state | 4 |
| Lead temperature (P package soldering, 10 s) |  |  |  | 260 | °C | P package soldering, 10 s | 4 |
| Maximum junction temperature |  |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| ESD human-body model | V(ESD) | -2000 |  | 2000 | V | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 | 4 |
| Supply voltage |  | 4.5 |  | 60 | V | LM2594HV | 4 |
| Temperature |  | -40 |  | 125 | °C |  | 4 |
| Junction-to-ambient thermal resistance | RθJA |  | 95 |  | °C/W | P (PDIP) 8 pins, simulated on 4-layer JEDEC board | 4 |
| Feedback voltage | VFB | 1.193 | 1.23 | 1.267 | V | 4.5 V ≤ VIN ≤ VINmax, 0.1 A ≤ ILOAD ≤ 0.5 A, VOUT programmed for 3 V, Circuit of Figure 35, TJ = 25°C | 6 |
| Feedback voltage | VFB | 1.18 |  | 1.28 | V | 4.5 V ≤ VIN ≤ VINmax, 0.1 A ≤ ILOAD ≤ 0.5 A, VOUT programmed for 3 V, Circuit of Figure 35, over full operating temperature range | 6 |
| Feedback bias current | Ib |  | 10 | 50 | nA | Adjustable version only, VFB = 1.3 V, TJ = 25°C | 6 |
| Feedback bias current | Ib |  |  | 100 | nA | Adjustable version only, VFB = 1.3 V, over full operating temperature range | 6 |
| Oscillator frequency | fO | 127 | 150 | 173 | kHz | See(3), TJ = 25°C | 6 |
| Oscillator frequency | fO | 110 |  | 173 | kHz | See(3), over full operating temperature range | 6 |
| Saturation voltage | VSAT |  | 0.9 | 1.1 | V | IOUT = 0.5 A, (4)(5), TJ = 25°C | 6 |
| Saturation voltage | VSAT |  |  | 1.2 | V | IOUT = 0.5 A, (4)(5), over full operating temperature range | 6 |
| Max duty cycle (ON) | DC |  |  | 100 | % | See(5) | 6 |
| Min duty cycle (OFF) | DC | 0 |  |  | % | See(6) | 6 |
| Current limit | ICL | 0.65 | 0.8 | 1.3 | A | Peak current(4)(5), TJ = 25°C | 6 |
| Current limit | ICL | 0.58 |  | 1.4 | A | Peak current(4)(5), over full operating temperature range | 6 |
| Output leakage current | IL |  |  | 50 | μA | Output = 0 V, (4)(6)(7) | 6 |
| Output leakage current | IL |  | 2 | 15 | mA | Output = −1 V, (4)(6)(7) | 6 |
| Quiescent current | IQ |  | 5 | 10 | mA | See(6) | 6 |
| Standby quiescent current | ISTBY |  | 140 | 250 | μA | ON/OFF pin = 5 V (OFF)(7), LM2594HV, TJ = 25°C | 6 |
| Standby quiescent current | ISTBY |  |  | 300 | μA | ON/OFF pin = 5 V (OFF)(7), LM2594HV, over full operating temperature range | 6 |
| ON/OFF pin logic input threshold voltage | VIL |  |  | 0.6 | V | Low (regulator ON), over full operating temperature range | 6 |
| ON/OFF pin logic input threshold voltage | VIH | 2 |  |  | V | High (regulator OFF), over full operating temperature range | 6 |
| ON/OFF pin logic input threshold voltage | VIH |  | 1.3 |  | V | ON/OFF pin logic input | 6 |
| ON/OFF pin input current | IH |  | 5 | 15 | μA | VLOGIC = 2.5 V (regulator OFF) | 6 |
| ON/OFF pin input current | IL |  | 0.02 | 5 | μA | VLOGIC = 0.5 V (regulator ON) | 6 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | copper area connected to this pin must be kept to a minimum. | 3 |

## CAD (KiCad official)

- Symbol: `LM2594HVN-ADJ`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: PDIP-8 (KiCad packages3D, STEP)
- 3D model files: `lm2594hvn-adj-etched.step` / `lm2594hvn-adj-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2594hvn-adj.step` / `lm2594hvn-adj.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm2594hvn-adj.pdf) (44 pp, sha256 `b24b906ae5438bc8`, retrieved 2026-11-02, tier: manufacturer)
- **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/lm2594hvn-adj-datasheet.pdf)