# LM21215MHX

**Texas Instruments** · DC-DC Converters · HTSSOP-20-EP

LM21215MHX from Texas Instruments, in a HTSSOP-20-EP. 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 | ILIM | passive | Resistor-programmable current limit pin; a resistor to ground sets the rising current limit ICLR, and shorting this pin to AGND selects the maximum possible current limit. |
| 2 | SS/TRK | passive | Soft-start control pin; an internal 2 µA current source charges an external capacitor to AGND to set the start-up output ramp rate, and the pin also configures the tracking feature. |
| 3 | EN | input | Active-high enable input for the device; if not used it can be left open, as an internal current source pulls it high. |
| 4 | AVIN | power_in | Analog input supply that generates the internal bias, recommended to connect to PVIN through a low-pass RC filter; recommended range is 2.95 V to 5.5 V to GND. |
| 5 | PVIN | power_in | Input voltage to the internal power switches, to be tied together with pins 6 and 7 at the device with low-ESR input capacitance placed as close as possible; recommended range is 2.95 V to 5.5 V to GND. |
| 6 | PVIN | power_in | Input voltage to the internal power switches, to be tied together with pins 5 and 7 at the device with low-ESR input capacitance placed as close as possible; recommended range is 2.95 V to 5.5 V to GND. |
| 7 | PVIN | power_in | Input voltage to the internal power switches, to be tied together with pins 5 and 6 at the device with low-ESR input capacitance placed as close as possible; recommended range is 2.95 V to 5.5 V to GND. |
| 8 | PGND | power_in | Power ground pin for the internal power switches, to be grouped with pins 9 and 10. |
| 9 | PGND | power_in | Power ground pin for the internal power switches, to be grouped with pins 8 and 10. |
| 10 | PGND | power_in | Power ground pin for the internal power switches, to be grouped with pins 8 and 9. |
| 11 | SW | output | Switch node pin, to be tied together locally with pins 12-16 and connected to the filter inductor. |
| 12 | SW | output | Switch node pin, to be tied together locally with pins 11 and 13-16 and connected to the filter inductor. |
| 13 | SW | output | Switch node pin, to be tied together locally with pins 11-12 and 14-16 and connected to the filter inductor. |
| 14 | SW | output | Switch node pin, to be tied together locally with pins 11-13 and 15-16 and connected to the filter inductor. |
| 15 | SW | output | Switch node pin, to be tied together locally with pins 11-14 and 16 and connected to the filter inductor. |
| 16 | SW | output | Switch node pin, to be tied together locally with pins 11-15 and connected to the filter inductor. |
| 17 | PGOOD | output | Open-drain power good indicator output. |
| 18 | COMP | passive | Compensation pin connected to the output of the voltage loop error amplifier. |
| 19 | FB | input | Feedback pin connected to the inverting input of the voltage loop error amplifier; the feedback reference is 0.6 V (±1%). |
| 20 | AGND | power_in | Quiet analog ground for the internal reference and bias circuitry. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | HTSSOP-20-EP |
| Category | Power Management (PMIC) |
| Pins | 21 |

## CAD (KiCad official)

- Symbol: `LM21215MHX`
- Footprint: `Package_SO:TSSOP-20-1EP_4.4x6.5mm_P0.65mm_EP2.15x3.35mm`
- 3D model: HTSSOP-20-EP, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 1.2 mm nominal TSSOP height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `lm21215mhx-etched.step` / `lm21215mhx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm21215mhx.step` / `lm21215mhx.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/lm21215) (40 pp, sha256 `08d986dd316137de`, retrieved 2026-10-12, 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-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/lm21215mhx-datasheet.pdf)