component
LM25118MHE
Public Made by Adomby adom
Texas Instruments DC-DC Controllers, 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
markdownLM25118MHE
Texas Instruments · DC-DC Controllers · HTSSOP-20-EP
LM25118MHE 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, operating range 3V to 42V (5V minimum for startup). |
| 2 | UVLO | input | Undervoltage lockout threshold monitor; below 1.23V disables regulator, use external divider to set VIN threshold. |
| 3 | RT | input | Oscillator frequency setting; connect resistor to AGND for 50kHz to 500kHz switching frequency. |
| 4 | EN | input | Enable input; below 0.5V enters shutdown with <10µA quiescent current, above 3V enables normal operation. |
| 5 | RAMP | input | Ramp slope control; connect external capacitor to AGND for emulated current mode control. |
| 6 | AGND | power_in | Analog ground reference for low-signal circuits. |
| 7 | SS | input | Soft-start control; external capacitor sets error amplifier reference rise time and is discharged on fault. |
| 8 | FB | input | Feedback signal input; compared against 1.23V reference for output voltage regulation. |
| 9 | COMP | output | Error amplifier output; connect loop compensation network between COMP and FB pins. |
| 10 | VOUT | input | Output voltage monitor input; connect directly to regulated output for emulated current mode control. |
| 11 | SYNC | input | Synchronization input; external clock at frequency greater than internal oscillator frequency locks switching. |
| 12 | CS | input | Current sense input; voltage across external sense resistor determines cycle-by-cycle current limit threshold. |
| 13 | CSG | power_in | Current sense ground; Kelvin-connect ground side of external sense resistor for accurate current measurement. |
| 14 | PGND | power_in | Power ground return path for high-current switching circuits and external MOSFET/diode grounds. |
| 15 | LO | output | Low-side boost MOSFET gate driver output; supplies 2.7A sink and 2.2A source current. |
| 16 | VCC | power_in | Bias regulator output; 7V typical at high VIN or tracks VIN at low VIN, 35mA maximum sourcing capability. |
| 17 | VCCX | power_in | Optional external bias supply input; voltage greater than 3.85V disables internal regulator and reduces IC power dissipation. |
| 18 | HB | input | Bootstrap capacitor positive node; place 0.1µF to 0.47µF ceramic capacitor between HB and HS for high-side gate drive supply. |
| 19 | HO | output | High-side buck MOSFET gate driver output; supplies 3.5A sink and 2.2A source current. |
| 20 | HS | input | High-side buck MOSFET source reference node; connect to MOSFET source and bootstrap capacitor, maintain HB-HS below 15V. |
| 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:
LM25118MHE - 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:
lm25118mhe-etched.step/lm25118mhe-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm25118mhe.step/lm25118mhe.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-4-6(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).