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LM26420Q1XMHX

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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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LM26420Q1XMHX

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

LM26420Q1XMHX 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 VINC power_in Supply for the control circuitry and high/low-side gate drivers; it should be RC-filtered to AGND (RF typically 1-10 Ω, CF 0.22-1 µF in X7R/X5R) and must not be lower than VIND1,2 − VTH.
2 EN1 input Logic-high enable input for buck converter 1; do not leave it floating or drive it above VIN + 0.3 V.
3 VIND1 power_in Input power supply for buck converter 1 (recommended VIN range 3 V to 5.5 V).
4 VIND1 power_in Input power supply for buck converter 1 (recommended VIN range 3 V to 5.5 V); pins 3 and 4 are internally the same net.
5 SW1 power_out Output switch node of buck converter 1; connects to the inductor.
6 PGND1 power_in Power ground pin for buck converter 1.
7 PGND1 power_in Power ground pin for buck converter 1; pins 6 and 7 are internally the same net.
8 FB1 input Feedback pin for buck converter 1; connect to an external resistor divider to set the output voltage (VREF = 0.8 V).
9 PG1 output Power-good indicator for buck converter 1; open-drain output that must be pulled up to an external supply through a resistor (typically 10 kΩ to 100 kΩ).
10 DAP passive Die attach pad connection; connect to system ground for low thermal resistance, but this pin cannot be used as the main GND connection.
11 DAP passive Die attach pad connection; connect to system ground for low thermal resistance, but this pin cannot be used as the main GND connection.
12 PG2 output Power-good indicator for buck converter 2; open-drain output that must be pulled up to an external supply through a resistor (typically 10 kΩ to 100 kΩ).
13 FB2 input Feedback pin for buck converter 2; connect to an external resistor divider to set the output voltage (VREF = 0.8 V).
14 PGND2 power_in Power ground pin for buck converter 2.
15 PGND2 power_in Power ground pin for buck converter 2; pins 14 and 15 are internally the same net.
16 SW2 power_out Output switch node of buck converter 2; connects to the inductor.
17 VIND2 power_in Input power supply for buck converter 2 (recommended VIN range 3 V to 5.5 V).
18 VIND2 power_in Input power supply for buck converter 2 (recommended VIN range 3 V to 5.5 V); pins 17 and 18 are internally the same net.
19 EN2 input Logic-high enable input for buck converter 2; do not leave it floating or drive it above VIN + 0.3 V.
20 AGND power_in Signal ground pin; place the bottom feedback resistor as close as possible to this pin.
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: LM26420Q1XMHX
  • 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: lm26420q1xmhx-etched.step / lm26420q1xmhx-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm26420q1xmhx.step / lm26420q1xmhx.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (47 pp, sha256 b25d3310c3924b09, retrieved 2026-10-08, 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, primary claude-haiku-5-5 (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