ISL8105A - 1V to 12V Single-Phase Synchronous Buck Converter PWM Controller with Integrated MOSFET Gate Drivers

The ISL8105 is a simple single-phase PWM controller for a synchronous buck converter that operates from 1V to 12V input voltage range. The IC can be operated from +5V to +12V bias voltage. With integrated linear regulator, boot diode, and gate drivers, the ISL8105 reduces external component count and board space requirements. These make the IC suitable for a wide range of applications.

Utilizing voltage-mode control, the output voltage can be precisely regulated to as low as 0.6V. The 0.6V internal reference features a maximum tolerance of ±1.5% over the industrial temperature range and line voltage variations. Two fixed oscillator frequency versions are available; 300 kHz (ISL8105 for high efficiency applications) and 600kHz (ISL8105A for fast transient applications).6 The ISL8105 features the capability of safe start-up with prebiased load. It also provides overcurrent protection by monitoring the on resistance of the bottom-side MOSFET to inhibit PWM operation appropriately. During start-up interval, the resistor connected to BGATE/BSOC pin is employed to program overcurrent protection condition. This approach simplifies the implementation and does not deteriorate converter efficiency.

• Wide Input Voltage Range: +1 to +12V Input Voltage
  • +5V to +12V Bias Voltage
  • 0.6V to V_IN Output Voltage Range
• 0.6V Internal Reference Voltage with ±1.5% tolerance.
• Integrated MOSFET Gate Drivers that Operate from VBias (+5V to +12V)
  • Bootstrapped High-side Gate Driver with Integrated Boot Diode
• Simple Voltage-Mode PWM Control
• Fixed Operating Frequency
  • 300kHz for ISL8105
  • 600kHz for ISL8105A
• Fixed Internal Soft-Start with Pre-biased Load Capability
• Lossless, Programmable Overcurrent Protection
  • Uses Bottom-side MOSFET’s rDS(ON)
• Enable/Disable Function Using COMP/EN Pin
• Overcurrent Protection for Sourcing and Sinking Currents
• Pb-Free Plus Anneal Available (RoHS Compliant)

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