Texas Instruments LM3503SQX-44/NOPB, DC-DC Regulator, Step-Up (Boost), 44V Output, 1 MHz, 2 Outputs, 750 mA Switch, 16-WFQFN, -40°C to 85°C.
| Parameter | Value |
|---|---|
| Type | DC DC Regulator |
| Mounting | Surface Mount |
| Voltage - output | 44V |
| Supply voltage | 5.5V |
| Current - output (Channel) | 750mA (Switch) |
| Frequency | 1MHz |
| I/O channels | 2 |
| Operating temperature | -40°C~85°C(TA) |
| Dimming | Analog, PWM |
| Package | Tape & Reel (TR) |
| Topology | Step-Up (Boost) |
| Applications | Backlight |
| Case | 16-WFQFN Exposed Pad |
| Internal switch | Yes |
This is a step-up (boost) DC-DC regulator for backlight applications, delivering a regulated output up to 44 V. Two independent outputs are provided, each with analog and PWM dimming capability. This allows separate brightness control for dual-zone backlighting or driving two LED strings with different current profiles from a single IC.
Housed in a 16-lead WFQFN with exposed pad (4 mm × 4 mm body).
No official successor part is listed by Texas Instruments. For a pin-compatible alternative, evaluate other devices in the LM3503 family (base product number LM3503) that may still be in production — verify the output voltage option and package variant against your BOM. For new designs, consider a current-production boost LED driver from TI's catalog with similar 44 V output and dual-channel dimming capability.