# TD1583

**Techcode Semicon** · DC-DC Converters · SOP-8

TD1583 from Techcode Semicon, 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 | Not connected (datasheet lists this pin as Not Connect with no function). |
| 2 | Vin | power_in | Supply input for the regulator, which operates from 3.6V to 28V DC, and Vin should be bypassed to GND with a suitably large capacitor to eliminate input noise. |
| 3 | SW | output | Power switch output node that supplies power to the output, switching between (VIN - VSAT) and approximately -0.5V, with absolute maximum VSW of -0.3 to Vin V. |
| 4 | GND | power_in | Ground pin that should be placed outside the Schottky diode to output capacitor ground path so switching current spikes do not induce noise into the IC. |
| 5 | FB | input | Feedback input that senses the output through an external resistor divider, with a feedback threshold of 1.222V and absolute maximum VFB of -0.3 to Vin V. |
| 6 | NC | unconnected | Not connected (datasheet lists this pin as Not Connect with no function). |
| 7 | EN | input | Digital enable input that turns the regulator on when driven high and off when driven low, with a threshold of about 0.7V to 1.3V and absolute maximum VEN of -0.3 to 12 V. |
| 8 | NC | unconnected | Not connected (datasheet lists this pin as Not Connect with no function). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Techcode Semicon |
| 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 |
|---|---|---|---|---|---|---|---|
| Input voltage | VIN | 3.6 |  | 28 | V |  | 5 |
| Shutdown Supply Current | ISTBY |  | 30 | 90 | uA | VEN=0V | 5 |
| Supply Current | ICC |  | 3.6 | 4 | mA | VEN=2V, VFB=1.3V | 5 |
| Feedback Voltage | VFB | 1.185 | 1.222 | 1.26 | V | VIN = 3.6V to 28V | 5 |
| Feedback Bias Current | IFB |  | 0.1 | 0.5 | uA | VFB=1.3V | 5 |
| Switch Current Limit | ILIM | 4 |  | 5 | A |  | 5 |
| Oscillator Frequency | FOSC | 320 | 380 | 440 | KHz |  | 5 |
| EN Pin Threshold | VEN | 0.7 | 1.2 | 1.7 | V | VIN =12V, VFB=0V | 5 |
| EN Pin Input Leakage Current (IH) | IH |  | -0.1 | -1 | uA | VEN=2.5V | 5 |
| EN Pin Input Leakage Current (IL) | IL |  | -3 | -10 | uA | VEN=0.5V | 5 |
| Input Voltage (recommended operating) | VIN | 3.6 |  | 28 | V |  | 4 |
| Operating Junction Temperature | TJ | -40 |  | 125 | ºC |  | 4 |
| Operating Ambient Temperature | TA | -10 |  | 85 | ºC |  | 4 |
| Input Voltage (absolute maximum) | VIN | -0.3 |  | 28 | V |  | 4 |
| Feedback Pin Voltage | VFB | -0.3 |  |  | V |  | 4 |
| Enable Pin Voltage | VEN | -0.3 |  | 12 | V |  | 4 |
| Switch Pin Voltage | VSW | -0.3 |  |  | V |  | 4 |
| Operating Junction Temperature (absolute maximum) | TJ |  |  | 150 | ºC |  | 4 |
| Storage Temperature | TSTG | -65 |  | 150 | ºC |  | 4 |
| Lead Temperature (Soldering, 10 sec) | TLEAD |  |  | 260 | ºC | 10 sec soldering | 4 |
| ESD (HBM) |  |  |  | 2000 | V | HBM | 4 |
| Maximum junction temperature (stated in text) | TJ |  |  | 145 | ºC |  | 14 |
| Frequency of Current Limit or Short Circuit Protection | FOSC1 |  | 42 |  | KHz | VFB=0V | 5 |
| Internal PMOS RDSON | RDSON |  | 80 |  | mΩ | VIN =12V, VFB=0V, VEN=12V, Iout=3A | 5 |
| Max Duty Cycle | DMAX |  | 100 |  | % | VFB=0V, ISW=0.1A | 5 |
| Thermal Shutdown | TOTSD |  | 165 |  | ºC |  | 5 |
| Thermal Resistance-Junction to Ambient | RθJA |  | 85 |  | ºC / W |  | 4 |
| Thermal Resistance-Junction to Case | RθJC |  | 45 |  | ºC / W |  | 4 |

## CAD (KiCad official)

- Symbol: `TD1583`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `td1583-etched.step` / `td1583-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `td1583.step` / `td1583.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Techcode Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588883980715876352) (16 pp, sha256 `55f1cfb197588f19`, retrieved 2026-10-09, 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/td1583-datasheet.pdf)