The ISL95873 is a Single-Phase Synchronous-Buck PWM controller featuring Renesas' proprietary R4™ Technology. The R4™ modulator has integrated compensation, fast transient performance, accurate switching frequency control, and excellent light-load efficiency. These technology advances, together with integrated MOSFET drivers and a Schottky bootstrap diode, allow for a high-performance regulator that is highly compact and needs few external components. Differential remote sensing of the output voltage is an additional feature. For maximum efficiency, the converter automatically enters diode-emulation mode (DEM) during light-load conditions, such as system standby. The ISL95873 accepts a wide 3. 3V to 25V input voltage range, making it ideal for systems that run on battery or AC-adapter power sources. It also is a low-cost solution for applications requiring tracking of an external reference voltage during soft-start. When the external reference level meets the internal reference voltage, the ISL95873 switches from the external reference to the internal reference. The external reference is only used during soft-start.


  • External reference tracking
  • R4™ modulator technology
  • Internal compensation
  • Fast, optimal transient response
  • Input voltage range: 3.3V to 25V
  • Output voltage range: 0.5V to 3.3V
  • Precision voltage regulation
  • ±0.5% System accuracy over -10°C to +100°C
  • Output voltage remote sense
  • Fixed 300kHz PWM frequency in continuous conduction
  • Proprietary frequency control loop
  • Automatic diode emulation mode for highest efficiency
  • Power-good monitor for soft-start and fault detection


  • Compact buck regulators requiring external tracking


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