# LM2596MD5T-ADJ

**HGSEMI** · DC-DC Converters · TO-252-5

LM2596MD5T-ADJ from HGSEMI, in a TO-252-5. 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 | Supply input requiring a 4.5V to 40V DC supply (60V for HV types), with a large-value capacitor placed between this pin and ground to suppress supply noise. |
| 2 | OUTPUT | output | Power switch output pin, which is the switching node that supplies the output load. |
| 3 | GND | power_in | Ground pin, which should be placed in the layout on the ground path at the output point away from the Schottky diode to keep switching current spikes from adding noise. |
| 4 | FEEDBACK | input | Voltage feedback pin that senses the output voltage through an external resistor divider, with a threshold voltage of 1.23V. |
| 5 | ON_OFF | input | Enable pin where a low level enables the chip and a high level shuts it down, defaulting to low when left floating. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | TO-252-5 |
| 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 (LM2596-ADJ) | VOUT | 1.193 | 1.23 | 1.267 | V | VIN=4.5V～40V, ILOAD=0.2A～3A | 7 |
| Input operating voltage (LM2596) | VIN | 4.5 |  | 40 | V |  | 7 |
| Standby current | ISTBY | 80 |  | 200 | uA | VON_OFF=5V | 7 |
| Quiescent current | IQ | 2 |  | 10 | mA | VON_OFF=0V, VFB=VIN | 7 |
| Oscillator frequency | FOSC | 127 | 150 | 173 | kHz |  | 7 |
| Current limit | IL | 3.6 | 4.8 | 6.9 | A | VFB=0 | 7 |
| Switch pin threshold voltage, high (control off) | VON_OFF | 1.4 |  |  | V |  | 7 |
| Switch pin threshold voltage, low (control on) | VON_OFF |  |  | 0.8 | V |  | 7 |
| Switch pin leakage current (OFF) | IH | 5 |  | 30 | µA | VON_OFF=2.5V(OFF) | 7 |
| Switch pin leakage current (ON) | IL | 0.2 |  | 10 | µA | VON_OFF=0.5V(ON) | 7 |
| Saturation voltage | VCE | 1.3 |  | 1.5 | V | VFB=0V, LOUT=3A | 7 |
| Maximum duty cycle | DMAX |  |  | 100 | % | CFB=0V | 7 |
| Input supply voltage (LM2596) | VIN | 5 |  | 40 | V |  | 5 |
| Operating junction temperature range | TJ | -40 |  | 125 | ℃ |  | 5 |
| Input supply voltage (LM2596) | VIN |  |  | 40 | V |  | 5 |
| Feedback pin voltage | VFB | -0.3 |  |  | V |  | 5 |
| ON_OFF pin voltage | VON_OFF | -0.3 |  |  | V |  | 5 |
| Power switch output pin voltage | VOUT | -0.3 |  |  | V |  | 5 |
| Operating junction temperature | TJ | -40 |  | 125 | ℃ |  | 5 |
| Storage temperature | TSTG | -65 |  | 150 | ℃ |  | 5 |
| Soldering temperature, 10 s (TO-252) | TLEAD |  |  | 260 | ℃ | 10 s, TO-252/SOP/DFN | 5 |
| ESD capability | ESD |  |  | 2000 | V | Human body model | 5 |
| Efficiency (LM2596-ADJ) | Ƞ |  | 73 |  | % | VIN=12V, VOUT=3V, ILOAD=3A | 7 |

## CAD (KiCad official)

- Symbol: `LM2596MD5T-ADJ`
- Footprint: `Package_TO_SOT_SMD:TO-252-5_TabPin6`
- 3D model: TO-252-5 (KiCad packages3D, STEP)
- 3D model files: `lm2596md5t-adj-etched.step` / `lm2596md5t-adj-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2596md5t-adj.step` / `lm2596md5t-adj.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/8756277727903264768) (17 pp, sha256 `986b3081cc1a4676`, retrieved 2026-10-18, 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-sonnet-5-5` (text+vision), consensus `claude-opus-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/lm2596md5t-adj-datasheet.pdf)