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LM25118MHX

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by adom

Texas Instruments DC-DC Converters, HTSSOP-20-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM25118MHX

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm25118mhx.step / lm25118mhx.glb are 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, 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