component
LM25118Q1MHX
Public Made by Adomby adom
Texas Instruments AC-DC Controllers And Regulators, 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
markdownLM25118Q1MHX
Texas Instruments · AC-DC Controllers And Regulators · HTSSOP-20-EP
LM25118Q1MHX 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 with recommended operating range of 3 V to 42 V. |
| 2 | UVLO | input | Undervoltage lockout input; regulator enters standby mode below 1.23 V and normal mode above 1.23 V with fixed 5 µA sourced current from pin. |
| 3 | RT | input | Oscillator frequency setting pin; connect resistor between this pin and AGND for recommended frequency range of 50 kHz to 500 kHz. |
| 4 | EN | input | Enable input; regulator enters low power mode drawing less than 10 µA when below 0.5 V and requires above 3 V for normal operation. |
| 5 | RAMP | input | Ramp capacitor connection; external capacitor between this pin and AGND sets the ramp slope for emulated current mode control. |
| 6 | AGND | power_in | Analog ground reference. |
| 7 | SS | input | Soft-start pin; external capacitor and internal 10 µA current source set the error amplifier reference rise time, held low when VCC <3.7 V or when UVLO/EN low or thermal shutdown active. |
| 8 | FB | input | Feedback signal input from regulated output connected to the inverting input of the internal error amplifier. |
| 9 | COMP | output | Error amplifier output; connect loop compensation network between this pin and FB pin. |
| 10 | VOUT | input | Output voltage monitor input for emulated current mode control; connect directly to regulated output. |
| 11 | SYNC | input | Synchronization clock input for switching regulator frequency synchronization to external clock. |
| 12 | CS | input | Current sense input; connect to the diode side of the current sense resistor. |
| 13 | CSG | power_in | Current sense ground reference; connect to ground side of the current sense resistor. |
| 14 | PGND | power_in | Power ground connection. |
| 15 | LO | output | Boost MOSFET gate drive output; connect to gate of external boost MOSFET. |
| 16 | VCC | power_out | Regulated bias supply output from internal regulator; locally decouple to PGND using low ESR/ESL capacitor placed as close to controller as possible. |
| 17 | VCCX | power_in | Optional external bias supply input; when voltage exceeds 3.9 V, internal VCC regulator is disabled and VCC connected to VCCX, otherwise connect to AGND if not used. |
| 18 | HB | power_in | High-side gate driver bootstrap supply; connect bootstrap capacitor between HB and HS with capacitor placed close to controller. |
| 19 | HO | output | High-side (buck) MOSFET gate drive output; connect to high-side MOSFET gate through short, low inductance path. |
| 20 | HS | input | High-side MOSFET source pin; connect to source terminal of high-side buck MOSFET and bootstrap capacitor. |
| 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:
LM25118Q1MHX - 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:
lm25118q1mhx-etched.step/lm25118q1mhx-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm25118q1mhx.step/lm25118q1mhx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (41 pp, sha256
39d708876b7ff442, 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 0.3, 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).