# LM25005MHX

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

LM25005MHX 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 | VCC | power_out | Bias regulator output regulated to 7V (typical) with decoupling capacitor 0.1µF to 1µF required. |
| 2 | SD | input | Shutdown/UVLO input where voltage below 0.7V shuts down regulator, 0.7V to 1.225V is standby mode, above 1.225V enables normal operation, with internal 5µA pull-up when open. |
| 3 | VIN | power_in | Input power supply voltage with nominal operating range of 7V to 42V. |
| 4 | VIN | power_in | Input power supply voltage with nominal operating range of 7V to 42V. |
| 5 | SYNC | tri_state | Oscillator synchronization input/output using open-drain architecture with 15ns minimum pulse width for external clock synchronization or multi-device phasing. |
| 6 | COMP | output | Error amplifier output connected to feedback compensation network between this pin and FB pin. |
| 7 | FB | input | Feedback signal input to error amplifier inverting input with 1.225V reference threshold for output voltage regulation. |
| 8 | RT | input | Oscillator frequency setting input controlled by external resistor to AGND with recommended operating frequency range of 50kHz to 500kHz. |
| 9 | RAMP | input | Ramp generator input controlled by external capacitor (50pF to 2nF) connected between this pin and AGND setting slope compensation. |
| 10 | AGND | power_in | Analog ground reference providing internal bias reference for control functions. |
| 11 | SS | input | Soft start input controlled by external capacitor and internal 10µA current source setting ramp rate, held low during standby/UVLO/thermal shutdown. |
| 12 | OUT | input | Output voltage sensing input directly connected to regulated VOUT for feedback control loop. |
| 13 | PGND | power_in | Power ground reference for integrated gate driver and current sense resistor low side. |
| 14 | PGND | power_in | Power ground reference for integrated gate driver and current sense resistor low side. |
| 15 | IS | input | Current sense input at freewheeling Schottky diode anode with internal sense resistor providing 0.5V/A current measurement for control loop. |
| 16 | IS | input | Current sense input at freewheeling Schottky diode anode with internal sense resistor providing 0.5V/A current measurement for control loop. |
| 17 | SW | output | Switch node output from internal buck MOSFET source terminal connected to Schottky diode anode and output inductor. |
| 18 | SW | output | Switch node output from internal buck MOSFET source terminal connected to Schottky diode anode and output inductor. |
| 19 | PRE | tri_state | Bootstrap capacitor pre-charge open-drain output connected to SW pin, conducting 250ns per cycle before buck switch on-time for light load pre-charging. |
| 20 | BST | power_in | Bootstrap capacitor supply input with 22nF ceramic capacitor charged from VCC through internal bootstrap diode during buck switch off-time. |
| 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 Supply Chip |
| Pins | 21 |

## CAD (KiCad official)

- Symbol: `LM25005MHX`
- 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: `lm25005mhx-etched.step` / `lm25005mhx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm25005mhx.step` / `lm25005mhx.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/lm25005) (39 pp, sha256 `cd8d34f54f429d0e`, retrieved 2026-10-05, 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-4-5-20251001` (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/lm25005mhx-datasheet.pdf)