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LM3492QMHX

Public Made by Adom

by adom

Texas Instruments LED Drivers, HTSSOP-20-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Contents

README

markdown

LM3492QMHX

Texas Instruments · LED Drivers · HTSSOP-20-EP

LM3492QMHX 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 EN input Internally pulled up; connect to a voltage higher than 1.63 V to provide precision enable for the device (EN rising threshold 1.55 V to 1.71 V).
2 VIN power_in Supply pin for the device; input range is 4.5 V to 65 V.
3 SW input Switch node, internally connected to the drain of the integrated MOSFET; SW to GND is rated −0.3 V to 67 V (−2 V transient for under 100 ns).
4 SW input Switch node, internally connected to the drain of the integrated MOSFET; SW to GND is rated −0.3 V to 67 V (−2 V transient for under 100 ns).
5 VOUT input Output voltage sense for nearly constant switching frequency control; VIN, RT and VOUT to GND are rated −0.3 V to 67 V.
6 RT input An external resistor from the VOUT pin to this pin sets the switching frequency, programmable from 200 kHz to 1 MHz.
7 FB input Output voltage feedback through a resistor divider; the pin voltage is from 1.05 V to 2.5 V and FB to GND is rated −0.3 V to 5 V.
8 GND power_in Analog signal ground.
9 IOUT2 input Input of the channel 2 current regulator; the regulated current is programmable via the IREF pin (50 mA to 200 mA).
10 IOUT1 input Input of the channel 1 current regulator; the regulated current is programmable via the IREF pin (50 mA to 200 mA).
11 CDHC input External capacitor sets the dynamic headroom control sensitivity; a 120 µA internal source charges it at start-up to provide soft start.
12 IREF input An external resistor from this pin to ground programs the regulated current of channels 1 and 2; IREF pin voltage is 1.231 V to 1.281 V.
13 COMM bidirectional Open-drain bidirectional logic pin for power-good, overtemperature, IOUT overvoltage and undervoltage indications and command sending; VCOMM-LOW is at most 0.7 V at 5 mA.
14 LGND power_in Ground of the current regulator; must be connected to the GND pin for normal operation, as LGND and GND are not internally connected.
15 DIM1/CLK bidirectional Controls ON/OFF of the channel 1 current regulator; internally pulled low by 5 µA, and also serves as the clock for latching COMM input/output data.
16 DIM2 input Controls ON/OFF of the channel 2 current regulator; internally pulled low by 5 µA (DIM voltage HIGH 1.17 V, LOW 0.7 V).
17 PGND power_in Integrated MOSFET ground; must be connected to the GND pin for normal operation, and PGND and GND are not internally connected.
18 PGND power_in Integrated MOSFET ground; must be connected to the GND pin for normal operation, and PGND and GND are not internally connected.
19 VCC power_out LDO regulator output nominally regulated to 5.5 V; connect a capacitor larger than 0.47 µF between VCC and GND.
20 ILIM input Connect an external resistor from ILIM to VCC to reduce the peak current limit; connect ILIM to ground for the maximum current limit.
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 Nixie Tube Driver/LED Driver
Pins 21

CAD (KiCad official)

  • Symbol: LM3492QMHX
  • 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: lm3492qmhx-etched.step / lm3492qmhx-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm3492qmhx.step / lm3492qmhx.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (34 pp, sha256 7ea739bbe0afd383, retrieved 2026-10-08, 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