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LM25116MHX

Public Made by Adom

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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Contents

README

markdown

LM25116MHX

Texas Instruments · DC-DC Converters · HTSSOP-20-EP

LM25116MHX 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 Supply voltage input rated 6 V to 42 V; serves as chip supply and input monitor for internal VCC regulator.
2 UVLO input Undervoltage lockout input; regulator enters standby mode when UVLO < 1.215 V and resumes operation when UVLO > 1.215 V.
3 RT/SYNC input Oscillator frequency set by external resistor to AGND for 50 kHz to 1 MHz range, or AC-coupled synchronization input for external clock.
4 EN input Enable input; regulator draws less than 10 µA when EN < 0.5 V and operates normally when EN > 3.3 V.
5 RAMP input Ramp control input; external capacitor connected to AGND sets the ramp slope for emulated current mode control.
6 AGND power_in Analog ground reference; connect to PGND through exposed pad ground connection under the LM25116.
7 SS input Soft start input; external capacitor and internal 10 µA current source set the soft-start time constant for error amplifier reference rise.
8 FB input Feedback signal from regulated output connected to error amplifier inverting input; regulation threshold is 1.215 V.
9 COMP output Error amplifier output; loop compensation network connected between COMP and FB pin.
10 VOUT input Output voltage monitor; connect directly to the regulated output voltage.
11 DEMB input Low-side MOSFET source voltage monitor for diode emulation; tie to ground for pre-biased load or use series resistor for synchronous operation.
12 CS input Current sense amplifier positive input; connect to top of current sense resistor or drain of low-side MOSFET for RDS(ON) sensing.
13 CSG power_in Current sense amplifier ground input; connect to bottom of sense resistor or source of low-side MOSFET for RDS(ON) current sensing.
14 PGND power_in Power ground; connect to AGND through exposed pad ground connection under the LM25116.
15 LO output Low-side gate driver output; connect to low-side MOSFET gate through short, low inductance path; rated for 3.5 A peak sink current.
16 VCC power_in Regulated bias supply voltage nominally 7.4 V; locally decouple with low ESR/ESL capacitor placed close to controller.
17 VCCX power_in Optional external bias supply input rated 4.75 V to 15 V; disables internal regulator when VCCX > 4.5 V; must be connected to ground if unused.
18 HB power_in High-side bootstrap supply rated 4.75 V to 15 V above SW; connect to bootstrap diode cathode and bootstrap capacitor positive terminal.
19 HO output High-side gate driver output; connect to high-side MOSFET gate through short, low inductance path; rated 1 A peak source and 2.2 A peak sink current.
20 SW output Switch node output; connect to bootstrap capacitor negative terminal and high-side MOSFET source; rated -3 V to 45 V.
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: LM25116MHX
  • 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: lm25116mhx-etched.step / lm25116mhx-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm25116mhx.step / lm25116mhx.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (45 pp, sha256 c0f0378591e92c69, 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