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LM20343MH

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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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LM20343MH

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

LM20343MH 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 SS/TRK input Soft-start or tracking control input: an internal 4.5 µA current source charges an external capacitor to set the soft-start rate, and leaving it open activates an internal 1 ms soft-start ramp.
2 FB input Feedback input connected to the inverting input of the internal transconductance error amplifier, which compares against an internal 800 mV reference.
3 PGOOD output Open-drain power good output indicating the output is regulating within tolerance, with a 10 kΩ to 100 kΩ pull-up resistor recommended if used.
4 COMP passive Output of the internal error amplifier and input to the PWM; the loop compensation network connects between COMP and AGND.
5 VIN power_in Input supply voltage with a nominal operating range of 4.5 V to 36 V.
6 VIN power_in Input supply voltage with a nominal operating range of 4.5 V to 36 V.
7 SW power_out Switch node: drain of the internal synchronous rectifier power NMOSFET and source of the internal control power NMOSFET.
8 SW power_out Switch node: drain of the internal synchronous rectifier power NMOSFET and source of the internal control power NMOSFET.
9 GND power_in Ground, the internal reference for the power MOSFETs.
10 GND power_in Ground, the internal reference for the power MOSFETs.
11 GND power_in Ground, the internal reference for the power MOSFETs.
12 AGND power_in Analog ground, the internal reference for the regulator control functions.
13 SW power_out Switch node: drain of the internal synchronous rectifier power NMOSFET and source of the internal control power NMOSFET.
14 SW power_out Switch node: drain of the internal synchronous rectifier power NMOSFET and source of the internal control power NMOSFET.
15 VIN power_in Input supply voltage with a nominal operating range of 4.5 V to 36 V.
16 VIN power_in Input supply voltage with a nominal operating range of 4.5 V to 36 V.
17 BOOT passive Boost input for the bootstrap capacitor, which is charged from VCC through an internal diode and connected from SW to BOOT to power the control MOSFET gate driver.
18 VCC power_out Output of the high-voltage linear regulator that tracks VIN up to about 7.2 V and regulates to approximately 5.5 V, requiring a 0.1 µF to 1 µF ceramic decoupling capacitor; it is an output only.
19 EN input Enable or UVLO input: an external voltage divider sets the line undervoltage lockout threshold, and an internal 2 µA pull-up enables the regulator if the pin is left unconnected.
20 RT passive Internal oscillator frequency adjust input, normally biased at 550 mV, with an external resistor between RT and AGND setting the oscillator frequency.
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: LM20343MH
  • 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: lm20343mh-etched.step / lm20343mh-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm20343mh.step / lm20343mh.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (33 pp, sha256 6a04da8b548e29a8, retrieved 2026-10-11, tier: lcsc)
  • 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