# LM5022MMX

**Texas Instruments** · DC-DC Converters · VSSOP-10-0.5mm

LM5022MMX from Texas Instruments, in a VSSOP-10-0.5mm. 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 | Source input voltage pin that feeds the start-up regulator and operates from 6 V to 60 V. |
| 2 | FB | input | Inverting input to the internal voltage error amplifier, whose non-inverting input connects to a 1.25-V reference. |
| 3 | COMP | bidirectional | Error amplifier output and PWM comparator input, with control loop compensation components connected between this pin and FB. |
| 4 | VCC | power_out | Output of the internal high-voltage linear regulator that must be bypassed to GND with a ceramic capacitor. |
| 5 | OUT | output | Gate driver output that connects to the external MOSFET gate and provides 1-A peak current capability. |
| 6 | GND | power_in | System ground. |
| 7 | UVLO | input | Input undervoltage lockout set through a resistor divider from the input voltage, with a 20-µA current source providing hysteresis. |
| 8 | CS | input | Current sense input for the switch current used in current mode control and cycle-by-cycle current limiting. |
| 9 | RT/SYNC | input | Oscillator frequency adjust pin where an external resistor to GND sets the frequency, and which also accepts an AC-coupled synchronization input. |
| 10 | SS | input | Soft-start pin where an external capacitor to ground is charged by a 10-µA current source to create the start-up ramp voltage. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-10-0.5mm |
| Category | Power Management ICs |
| Pins | 10 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VIN to GND |  | -0.3 |  | 65 | V |  | 4 |
| VCC to GND |  | -0.3 |  | 16 | V |  | 4 |
| RT/SYNC to GND |  | -0.3 |  | 5.5 | V |  | 4 |
| OUT to GND |  | -1.5 |  |  | V | for < 100 ns | 4 |
| All other pins to GND |  | -0.3 |  | 7 | V |  | 4 |
| Junction temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Supply voltage |  | 6 |  | 60 | V |  | 4 |
| External voltage at VCC |  | 7.5 |  | 14 | V |  | 4 |
| Junction temperature (operating) | TJ | -40 |  | 125 | °C |  | 4 |
| Junction-to-ambient thermal resistance | RθJA |  | 161.5 |  | °C/W | DGS (VSSOP) 10 pins | 4 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 56 |  | °C/W | DGS (VSSOP) 10 pins | 4 |
| Junction-to-board thermal resistance | RθJB |  | 81.3 |  | °C/W | DGS (VSSOP) 10 pins | 4 |
| Junction-to-top characterization parameter | ψJT |  | 5.7 |  | °C/W | DGS (VSSOP) 10 pins | 4 |
| Junction-to-board characterization parameter | ψJB |  | 80 |  | °C/W | DGS (VSSOP) 10 pins | 4 |
| FB pin voltage | VFB | 1.225 | 1.25 | 1.275 | V |  | 5 |
| VCC regulation | VCC | 6.6 | 7 | 7.4 | V | 10 V ≤ VIN ≤ 60 V, ICC = 1 mA | 5 |
| Supply current | ICC |  | 3.5 | 4 | mA | OUT Pin Capacitance = 0, VCC = 10 V | 5 |
| VCC current limit | ICC-LIM | 15 |  | 35 | mA | VCC = 0 V | 5 |
| Dropout voltage across bypass switch | VIN - VCC |  |  | 200 | mV | ICC = 0 mA, ƒSW < 200 kHz, 6 V ≤ VIN ≤ 8.5 V | 5 |
| Startup regulator leakage | IVIN |  | 150 | 500 | µA | VIN = 60 V | 5 |
| Shutdown current | IIN-SD |  | 350 | 450 | µA | VUVLO = 0 V, VCC = Open Circuit | 5 |
| COMP pin current sink capability | ICOMP | 5 |  | 17 | mA | VFB = 1.5 V, VCOMP = 1 V | 5 |
| Shutdown threshold | VSD | 1.22 | 1.25 | 1.28 | V |  | 5 |
| Shutdown hysteresis current source | ISD-HYS | 16 | 20 | 24 | µA |  | 5 |
| Current limit threshold voltage | VCS | 0.45 | 0.5 | 0.55 | V |  | 5 |
| CS pin sink impedance | RCS | 40 |  | 75 | Ω | Blanking active | 5 |
| Soft-start current source | ISS | 7 | 10 | 13 | µA |  | 5 |
| Soft start to COMP offset | VSS-OFF | 0.35 | 0.55 | 0.75 | V |  | 5 |
| Oscillator frequency | fSW | 170 | 200 | 230 | kHz | RT to GND = 84.5 kΩ | 6 |
| Oscillator frequency | fSW | 525 | 600 | 675 | kHz | RT to GND = 27.4 kΩ | 6 |
| Oscillator frequency | fSW | 865 | 990 | 1115 | kHz | RT to GND = 16.2 kΩ | 6 |
| Maximum duty cycle | DMAX |  | 90 | 95 | % |  | 6 |
| COMP pin open circuit voltage | VCOMP-OC | 4.3 | 5.2 | 6.1 | V | VFB = 0 V | 6 |
| COMP pin short circuit current | ICOMP-SC | 0.6 | 1.1 | 1.5 | mA | VCOMP = 0 V, VFB = 1.5 V | 6 |
| Slope compensation amplitude | VSLOPE | 83 | 110 | 137 | mV |  | 6 |
| Output high saturation voltage (VCC, VOUT) | VSAT-HI | 0.25 |  | 0.75 | V | IOUT = 50 mA | 6 |
| Output low saturation voltage (VOUT) | VSAT-LO | 0.25 |  | 0.75 | V | IOUT = 100 mA | 6 |

## CAD (KiCad official)

- Symbol: `LM5022MMX`
- Footprint: `Package_SO:MSOP-10_3x3mm_P0.5mm`
- 3D model: VSSOP-10-0.5mm (KiCad packages3D, STEP)
- 3D model files: `lm5022mmx-etched.step` / `lm5022mmx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm5022mmx.step` / `lm5022mmx.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/lm5022.pdf) (41 pp, sha256 `81fac7aadae5194f`, retrieved 2026-11-05, 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/lm5022mmx-datasheet.pdf)