# LM3429Q1MH

**Texas Instruments** · LED Drivers · HTSSOP-14

LM3429Q1MH from Texas Instruments, in a HTSSOP-14. 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 voltage pin (VIN range 4.5 V to 75 V); bypass with a 100 nF capacitor to AGND as close to the device as possible. |
| 2 | COMP | input | Compensation pin; connect a capacitor to AGND to set the loop compensation. |
| 3 | CSH | input | Current sense high pin; connect a resistor to AGND to set signal current, or a current source or potentiometer to AGND for analog dimming. |
| 4 | RCT | input | Resistor-capacitor timing pin; connect a resistor from the switch node and a capacitor to AGND to set the switching frequency. |
| 5 | AGND | power_in | Analog ground that provides the ground return for CSH, COMP and RCT; connect to PGND through the DAP copper pad. |
| 6 | OVP | input | Overvoltage protection pin; connect a resistor divider from the output or input to program OVLO, with a 1.24 V turn-off threshold and 20 µA hysteresis current source. |
| 7 | nDIM | input | Dual-function PWM dimming and input UVLO pin with a 1.24 V turn-on threshold and 20 µA hysteresis current source. |
| 8 | NC | unconnected | No connection; leave open. |
| 9 | PGND | power_in | Power ground for GATE; connect to AGND through the DAP copper pad to provide the ground return. |
| 10 | GATE | output | Gate drive output; connect to the gate of the external N-channel FET. |
| 11 | VCC | power_out | Internal regulator output; bypass with a 2.2 µF-3.3 µF ceramic capacitor to PGND. |
| 12 | IS | input | Main switch current sense; connect to the drain of the main N-channel MOSFET for RDS(ON) sensing, or to a sense resistor installed in the source of the same device. |
| 13 | HSP | input | LED current sense positive; connect through a series resistor to the LED current sense resistor. |
| 14 | HSN | input | LED current sense negative; connect through a series resistor to the LED current sense resistor. |
| 15 | DAP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | HTSSOP-14 |
| Category | LED Drivers |
| Pins | 15 |

## CAD (KiCad official)

- Symbol: `LM3429Q1MH`
- Footprint: `Package_SO:TSSOP-14-1EP_4.4x5mm_P0.65mm`
- 3D model: HTSSOP-14 (KiCad packages3D, STEP)
- 3D model files: `lm3429q1mh-etched.step` / `lm3429q1mh-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm3429q1mh.step` / `lm3429q1mh.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lm3429-q1) (65 pp, sha256 `3e1d13598a9c0c70`, 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](docs/lm3429q1mh-datasheet.pdf)