# LM5021MMX-2

**Texas Instruments** · AC-DC Controllers And Regulators · VSSOP-8-0.65mm

LM5021MMX-2 from Texas Instruments, in a VSSOP-8-0.65mm. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | COMP | input | Control input for PWM and Hiccup comparators with 5kΩ internal pull-up resistor for opto-coupler biasing. |
| 2 | VIN | power_in | Input voltage to start-up regulator with 36V internal zener diode clamp. |
| 3 | VCC | power_out | 8.5V nominal regulated output of linear bias supply regulator for controller and gate drive. |
| 4 | OUT | output | MOSFET gate driver output capable of 0.3A peak source current and 0.7A peak sink current. |
| 5 | GND | power_in | Ground return. |
| 6 | CS | input | Current sense input with 0.5V threshold for cycle-by-cycle current limiting and 90ns leading edge blanking. |
| 7 | RT | output | Oscillator timing resistor pin accepting external resistor to ground for frequency setting and external clock synchronization pulses. |
| 8 | SS | output | Soft-start and hiccup timing pin driven by internal 22µA current source for startup ramp control. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8-0.65mm |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM5021MMX-2`
- Footprint: `Package_SO:VSSOP-8_2.3x2mm_P0.5mm`
- 3D model: VSSOP-8-0.65mm (KiCad packages3D, STEP)
- 3D model files: `lm5021mmx-2-etched.step` / `lm5021mmx-2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm5021mmx-2.step` / `lm5021mmx-2.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/cn/lit/gpn/lm5021) (38 pp, sha256 `039278930e2432ef`, retrieved 2026-09-22, 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 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-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/lm5021mmx-2-datasheet.pdf)