component
LM25118MHX
Public Made by Adomby adom
Texas Instruments DC-DC Converters, HTSSOP-20-EP. Pinout cross-checked by two models against the datasheet, 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
markdownLM25118MHX
Texas Instruments · DC-DC Converters · HTSSOP-20-EP
LM25118MHX 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 | VIN | power_in | Input supply voltage rated 3V to 42V (minimum 5V for startup). |
| 2 | UVLO | input | Undervoltage lockout threshold input; below 1.23V enters standby mode, above 1.23V enables normal operation; 5µA internal pull-up current. |
| 3 | RT | input | Oscillator frequency-setting resistor connected to AGND; recommended range 50kHz to 500kHz. |
| 4 | EN | input | Enable input; below 0.5V enters shutdown mode drawing less than 10µA, above 3V enables normal operation. |
| 5 | RAMP | input | Ramp capacitor connection for emulated current-mode control; current source magnitude depends on VIN and VOUT. |
| 6 | AGND | power_in | Analog ground reference for low-current signal paths including RT, RAMP, SS, FB, and COMP pins. |
| 7 | SS | input | Soft-start capacitor input charged by internal 10µA current source; held low when VCC under-threshold, UVLO low, EN low, or thermal shutdown active. |
| 8 | FB | input | Feedback signal input to inverting terminal of internal error amplifier with 1.23V reference. |
| 9 | COMP | output | Error amplifier output; loop compensation network connects between this pin and FB pin. |
| 10 | VOUT | input | Output voltage monitor for emulated current-mode control; connect directly to regulated output. |
| 11 | SYNC | input | Synchronization input for external clock; threshold 1.3V falling edge, minimum pulse width 15ns. |
| 12 | CS | input | Current sense input connected to diode side of current sense resistor; 60µA bias current source. |
| 13 | CSG | input | Current sense ground connected to ground side of sense resistor; 60µA bias current source. |
| 14 | PGND | power_in | Power ground for high-current switching paths and inductor current return. |
| 15 | LO | output | Boost MOSFET gate drive output; peak source 2.2A, peak sink 2.7A; rise 16ns, fall 14ns. |
| 16 | VCC | power_out | Bias regulator output nominally 7V; 35mA source limit; bypass with 0.1µF to 1µF low-ESR ceramic capacitor to PGND. |
| 17 | VCCX | power_in | Optional external bias supply 3.85V to 15V; when greater than 3.85V disables internal VCC regulator. |
| 18 | HB | power_in | High-side gate driver supply; bootstrap capacitor (0.1µF to 0.47µF) connected between HB and HS; rated -0.3V to 16V relative to HS. |
| 19 | HO | output | Buck MOSFET gate drive output; peak source 2.2A, peak sink 3.5A; rise 14ns, fall 12ns. |
| 20 | HS | input | High-side MOSFET source pin connection; bootstrap capacitor return and high-side gate driver reference. |
| 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:
LM25118MHX - 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:
lm25118mhx-etched.step/lm25118mhx-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm25118mhx.step/lm25118mhx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (45 pp, sha256
e7032a33be01a68b, retrieved 2026-10-01, 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, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).