The ISL85005 and ISL85005A are monolithic, synchronous buck regulators with integrated 5A, 18V high-side and low-side FETs. These devices provide an integrated bootstrap diode for the high-side gate driver to reduce the external parts count. These devices also have a wide input voltage range to support applications with input voltage from multi-cell batteries or regulated 5V and 12V power rails. The ISL85005 and ISL85005A regulate the output voltage with current mode control and have an internal oscillator. The switching frequency of the ISL85005 is internally set as 500kHz, and can be synchronized to an external clock signal with frequency ranges from 300kHz to 2MHz. The ISL85005A has a fixed 500kHz switching frequency. The ISL85005 has a fixed 2. 3ms soft-start, while the ISL85005A features programmable soft-start to limit inrush current during startup. With the SS pin floating, the soft-start time of ISL85005A is also 2. 3ms. The ISL85005 can be configured in either forced Continuous Conduction Mode (CCM) or Diode Emulation Mode (DEM). DEM enables high efficiency at light-load conditions. The ISL85005A always operates in forced CCM. The ISL85005 and ISL85005A have built-in protections including input UVLO protection, input and output overvoltage protection, high-side cycle-by-cycle current limit, low-side forward current limit and reverse current limit, and thermal shutdown.


  • 4.5V to 18V input voltage range
  • Internal 5A, 18V high-side and low-side MOSFET switches
  • ±1%, 0.8V feedback voltage reference
  • Integrated bootstrap diode with undervoltage detection
  • Current mode control with internal slope compensation
  • Internal or external compensation options
  • Default internally set 500kHz switching frequency
  • Synchronization capability to external clock (ISL85005)
  • Diode Emulation Mode (DEM) and Forced CCM (FCCM) options (ISL85005)
  • Adjustable soft-start time (ISL85005A)
  • Output Power-Good (PG) indicator
  • Input Undervoltage Lockout (UVLO), input and output overvoltage protection
  • High-side cycle-by-cycle current limit, low-side forward and reverse overcurrent protection, and thermal shutdown
  • Small 12-pin 3mmx4mm Dual Flat No-Lead (DFN) package with EPAD for enhanced thermal performance



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12V Sync Buck Regulator Family Delivers Up to 14A

Find out how Intersil's high efficient, compact 12V synchronous buck regulator family can meet your power requirements for 12V rails in industrial and infrastructure applications.


12V Synchronous Buck Regulator Family

Today I would like to introduce one of the most efficient and compact synchronous buck regulator families in the marketplace today.

There are many 12V rails in industrial applications today that need a buck converter to step the voltage down to a lower voltage and deliver up to 14A. Some of these applications often require a very efficient and compact solution. The highly integrated buck regulators listed here allow the users to meet all these requirements.

The ISL85009, ISL85012 and ISL85014 are pin compatible, very efficient and are able to deliver up to 14A. In applications that need less than 5A, Renesas offers ISL85003 and ISL85005 that are pin compatible. The ISL85009, ISL85012 and ISL85014 can operate from 3.8V to 18V input voltage, and the output voltage can be set as low as 0.6V. This family is highly integrated. The high-side and low-side FETs, with a bootstrap diode and compensation circuits are all integrated which helps to reduce the size, cost and bill of material.

This family is also highly reliable. It has high-side and low-side overcurrent protection, input and output overvoltage protection, over-temperature protection and negative current protection all integrated in the IC. This family also provides full feature sets and design flexibility to customers.

For instance, the selectable OCP scheme feature gives flexibility to the power supply designer to choose between hiccup and latch-off OCP mode, depending on their application requirements. Finally, the ISL85009, ISL85012 and ISL85014 are pin compatible, highly efficient and capable of delivering up to 14A in a very small 3.5mm x 3.5mm TQFN package.

As you see in the efficiency curve here, the ISL85009 provides one of the most efficient solution in the marketplace today. To support our customers with this family, we have developed several evaluation and demo boards.

Supporting tools such as iSim model, PowerCompass, schematic and Gerber files are all available online for this family on our website.