component
LM5021MMX-1
Public Unreviewedby Ray
Texas Instruments AC-DC Controllers and Regulators, VSSOP-8-0.65mm. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLM5021MMX-1
Texas Instruments · AC-DC Controllers and Regulators · VSSOP-8-0.65mm
LM5021MMX-1 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 the PWM and Hiccup comparators. Internally pulled up through a 5 kΩ resistor to allow biasing an opto-coupler transistor for isolated feedback. Open-circuit voltage ~5.1 V, short-circuit current ~1.1 mA. |
| 2 | VIN | power_in | Input to the start-up regulator. Directly connected to the rectified high-voltage bus. Internally clamped to 36 V (typ) by a zener diode; recommended operating range 8-30 V, absolute max 30 V to GND with 5 mA clamp current. |
| 3 | VCC | power_out | Output of the internal linear bias supply regulator, nominally 8.5 V (regulator current limit ~22 mA). Supplies the controller and gate driver sections. Requires an external bypass capacitor to GND. Regulator enables at ~7 V and disables at ~5.8 V. |
| 4 | OUT | output | MOSFET gate driver output. High-current push-pull driver to the external power MOSFET gate, with source/sink capability of 0.3 A / 0.7 A respectively. |
| 5 | GND | power_in | Ground return for the device. All bypass and timing components should reference this pin with a short, low-inductance path. |
| 6 | CS | input | Current sense input for current-mode control and over-current protection. Cycle-by-cycle current limit threshold ~0.5 V. If CS exceeds 0.5 V above the OUT-off level (>~0.5 V during a leading edge), OUT is switched low. CS is held low for 90 ns after OUT switches high to blank the leading-edge current spike (internal sinking impedance ~35 Ω). Absolute max 1.25 V. |
| 7 | RT/SYNC | bidirectional | Oscillator timing resistor pin and synchronization input. An external resistor from RT to GND sets the oscillator frequency (e.g. 44.2 kΩ → 150 kHz, 13.3 kΩ → 500 kHz). Also accepts synchronization pulses from an external clock (sync threshold ~3.2 V). |
| 8 | SS | output | Soft-start and hiccup timing pin. An external capacitor combined with the internal 22 µA current source sets the soft-start ramp. The same capacitor controls the hiccup-mode period during persistent overload. Open-circuit voltage ~5.2 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8-0.65mm |
| Category | PMIC |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
LM5021MMX-1LM5021MMX-1MM-1LM5021MMX-1N-1
CAD (KiCad official)
- Symbol:
LM5021MMX-1 - Footprint:
Package_SO:VSSOP-8_2.3x2mm_P0.5mm - 3D model: VSSOP-8-0.65mm (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (37 pp, sha256
c6cf9f41dac472b2, retrieved 2026-08-17, 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:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).