Texas Instruments LM3423Q1MHX/NOPB, Automotive AEC-Q100 DC DC Controller, 1-output, SEPIC/Buck/Boost, 2MHz, 4.5V-75V, Analog/PWM Dimming, 20-HTSSOP.
| Parameter | Value |
|---|---|
| Type | DC DC Controller |
| Series | Automotive, AEC-Q100 |
| Mounting | Surface Mount |
| Voltage | 4.5V |
| Frequency | 2MHz |
| I/O channels | 1 |
| Operating temperature | -40°C ~ 125°C (TJ) |
| Dimming | Analog, PWM |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Topology | SEPIC, Step-Down (Buck), Step-Up (Boost) |
| Case | 20-PowerTSSOP (0.173\", 4.40mm Width) |
| Internal switch | No |
The LM3423Q1MHX/NOPB: This controller supports SEPIC, buck, and boost topologies — so one BOM position can serve a constant-current LED string whether the input rail is below, above, or overlapping the LED forward voltage. Dimming is handled by both analog and PWM methods — analog dimming adjusts the current sense threshold linearly, while PWM dimming switches the LED string at a duty cycle that preserves colour temperature.
The TLC69611RTWR is a linear LED driver with 16 outputs and PWM dimming, but it is a different device class — linear vs. switching controller — and its 3.0 V supply and 85°C temperature limit do not match the 75 V input range or 125°C junction rating of the LM3423Q1MHX/NOPB. No direct pin-compatible second-source exists; the LM3423Q1MHX/NOPB is a unique controller for automotive high-brightness LED strings.