LD39150DT33-R

LD39150DT33-R is a small constant‑current LED driver IC (buck regulator) used to power LED strings from a higher voltage source. It regulates LED current rather than voltage, improving brightness stability across supply swings.
Typical features you’ll see (varies by exact variant):
- Integrated switching regulator with high efficiency
- External sense resistor to set LED current
- Wide input voltage range
- Protection options (short/overload, thermal shutdown, undervoltage lockout)
- Compact surface‑mount package (used in compact LED lighting, backlighting, etc.)
Common applications:
- LED backlighting and general LED lighting
- Portable devices and automotive lighting
How it’s used (general):
- Connect the LED string to the driver output
- Set current with the external sense resistor
- Provide Vin and enable/shutdown as required
- Ensure adequate thermal management

Here are typical features of LD39150DT33-R (datasheet should be consulted for exact specs):
- Constant-current LED driver with integrated high-side switching element
- Wide input voltage range suitable for automotive and high-power LED strings
- External sense resistor sets precise LED current
- High efficiency switching regulator
- Fault protection: open/short LED protection, overcurrent protection, thermal shutdown, undervoltage lockout
- Enable/Shutdown control for dimming or standby
- Soft-start to limit inrush and suppress current spikes
- Status or fault indication output (diagnostic)
- Minimal external components; compact DT33 package; RoHS-compliant

- Pin count: 8 pins (SOP-8/SOIC-8 package)
- Function: Fixed-output 3.3V step-down DC-DC converter (buck regulator) with an integrated switch; converts a higher input voltage to 3.3V for downstream circuitry (requires external inductor/diode or can be synchronous depending on variant). Includes standard pins such as VIN, GND, EN, FB, SW/LX, etc. For exact pinout, refer to the datasheet page for this package.

Manufacturer: Leadtrend Technology Co., Ltd. (Leadtrend).
What kind of company: A Taiwan-based fabless semiconductor company that designs and markets LED driver ICs and power-management ICs for LED lighting and related applications.

- White LED backlight driving (LCD TVs/monitors, signage)
- High-efficiency DC-DC buck regulator for portable devices
- Power regulation in consumer electronics (set-top boxes, displays)
- Automotive 12V systems (lighting, auxiliary power)
- Industrial and telecom power supplies and adapters
Note: LD39150DT33-R is a high-efficiency buck/LED-driver IC; exact suitability depends on your design requirements.

DFN-8, 3×3 mm package (with exposed pad). Please confirm with the manufacturer’s datasheet for the exact variant.