component
LM5118MHX
Public Made by Adomby adom
Texas Instruments DC-DC Converters, TSSOP-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
markdownLM5118MHX
Texas Instruments · DC-DC Converters · TSSOP-20-EP
LM5118MHX from Texas Instruments, in a TSSOP-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 to the controller; 3 V to 75 V operating range with 5 V minimum for startup. |
| 2 | UVLO | input | Undervoltage lockout input; regulator enters standby mode when below 1.23 V, resumes normal operation when above 1.23 V. |
| 3 | RT | input | Oscillator frequency-setting pin; connect resistor to AGND to set switching frequency from 50 kHz to 500 kHz. |
| 4 | EN | input | Enable input; below 0.5 V enters shutdown drawing less than 10 µA from VIN, above 3 V enables normal operation. |
| 5 | RAMP | input | Ramp control signal pin; external capacitor to AGND sets ramp slope for emulated current mode control. |
| 6 | AGND | power_in | Analog ground reference. |
| 7 | SS | input | Soft start input; external capacitor and 10-µA current source set error amplifier reference rise time. |
| 8 | FB | input | Feedback signal input from regulated output; connect to inverting input of internal error amplifier. |
| 9 | COMP | output | Error amplifier output; connect loop compensation network between COMP and FB. |
| 10 | VOUT | input | Output voltage monitor input for emulated current mode control; connect directly to regulated output. |
| 11 | SYNC | input | Synchronization input for switching regulator to external clock with falling edge threshold of 1.3 V. |
| 12 | CS | input | Current sense input; connect to the diode side of current sense resistor with cycle-by-cycle threshold of -125 mV in buck mode. |
| 13 | CSG | input | Current sense ground input; connect to ground side of current sense resistor. |
| 14 | PGND | power_in | Power ground reference. |
| 15 | LO | output | Boost MOSFET gate drive output with peak source current 2.2 A and sink current 2.7 A; connect to external boost MOSFET gate. |
| 16 | VCC | power_out | Bias regulator output supplying 7 V (typical) for controller and gate drivers with 35 mA sourcing current limit. |
| 17 | VCCX | power_in | Optional external bias supply input; disables internal VCC regulator when above 3.85 V. |
| 18 | HB | input | High-side gate driver bootstrap supply node with 15 V rating; connect bootstrap capacitor between HB and HS. |
| 19 | HO | output | Buck MOSFET gate drive output with peak source current 2.2 A and sink current 3.5 A; connect to high-side buck MOSFET gate. |
| 20 | HS | input | Buck 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 | TSSOP-20-EP |
| Category | Power Management (PMIC) |
| Pins | 21 |
CAD (KiCad official)
- Symbol:
LM5118MHX - Footprint:
Package_SO:TSSOP-20-1EP_4.4x6.5mm_P0.65mm_EP2.15x3.35mm - 3D model: TSSOP-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:
lm5118mhx-etched.step/lm5118mhx-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm5118mhx.step/lm5118mhx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (48 pp, sha256
a7cd61394358d330, 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).