Buck regulator for high-current LED strings
The STMicroelectronics LED2001PUR is a monolithic step-down (buck) DC-DC regulator designed to drive a single LED string at up to 4 A continuous output current. Its 850 kHz switching frequency allows the use of a small inductor and output capacitor, shrinking the total solution footprint for space-constrained lighting modules. The input voltage range spans 3 V to 18 V, covering common automotive battery rails (12 V nominal) and industrial 5 V or 12 V supplies. The internal power switch eliminates the need for an external MOSFET, simplifying the BOM and layout.
PWM dimming and thermal performance
PWM dimming input enables brightness control with a wide duty-cycle range — the regulator responds to the PWM signal by turning the output on and off, achieving linear dimming without colour shift. The 850 kHz switching frequency is high enough to keep the PWM dimming frequency outside the audible range. The 8-VFQFPN (4x4) package with exposed pad provides a low thermal resistance path to the PCB copper plane. The junction temperature range of -40°C to 150°C suits automotive under-hood and high-ambient industrial lighting applications where heat dissipation is critical.
Active lifecycle and compliance
Sourced through independent distribution channels; current pricing and lead time are confirmed at RFQ against your BOM quantity. No pin-compatible direct replacement is listed — the part is the primary STMicroelectronics offering in this current class.