IR claims industry’s smallest PFC boost IC in 5-pin SOT-23

-July 31, 2013

International Rectifier announced the introduction of the IRS2505LTRPBF a power factor correction (PFC) boost IC in a 5-pin SOT23 package for switch mode power supply (SMPS), LED drivers, fluorescent and HID electronic ballast applications.


The IRS2505L extends IR’s µPFCTM PFC control IC family and features a novel control system that can implement a PFC controller with only five pins. The IC may be configured to operate in critical conduction boost PFC, buck or flyback configuration.


The part incorporates a free-running frequency oscillator with on- and off-time control of the boost power MOSFET. The on-time feature is used to maintain an accurate and constant DC bus output voltage while providing a sinusoidal-shaped AC mains input current for high power factor and ultra-low total harmonic distortion. The off-time is determined by the inductor current zero-crossing detection circuit that does not require a secondary winding.


Application diagram showing relatively simple design


The IC  offers wide input voltage and load range, regulated DC bus output voltage and programmable DC bus voltage level. Protection features include DC bus over-voltage protection, programmable MOSFET over-current protection and integrated ESD protection on all pins. Micro-power start-up current, 20.8V internal Zener clamp on VCC and latch immunity on all inputs & outputs are also featured.


Timing diagram





Part Number



Standby Current




SOT23 5-L

7.9V – 20.8V


4.1V +/-1.9%

50/450 mA




Pricing for the IRS2505L begins at US $0.25 each in quantities of 10,000-units.


A datasheet is available on the International Rectifier website at

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