Single-Phase Buck PWM Controller with High Speed MOSFET Driver and Pre-Biased Load Capability

Product Status: Mass Production


The ISL6540A is an improved version of the ISL6540 single-phase voltage-mode PWM controller with input voltage feed-forward compensation to maintain a constant loop gain for optimal transient response, especially for applications with a wide input voltage range. Its integrated high speed synchronous rectified MOSFET drivers and other sophisticated features provide complete control and protection for a DC/DC converter with minimum external components, resulting in minimum cost and less engineering design efforts.

The output voltage of the converter can be precisely regulated with an internal reference voltage of 0.591V, and has an improved system tolerance of ±0.68% over commercial temperature and line load variations. An external voltage can be used in place of the internal reference for voltage tracking/DDR applications.

The ISL6540A has an internal linear regulator or external linear regulator drive options for applications with only a single supply rail. The internal oscillator is adjustable from 250kHz to 2MHz. The integrated voltage margining, programmable pre-biased soft-start, differential remote sensing amplifier, and programmable input voltage POR features enhance the ISL6540A value.


  • VIN and Power Rail Operation from +3.3V to +20V
  • Fast Transient Response - 0 to 100% Duty Cycle
  • 15MHz Bandwidth Error Amplifier with 6V/µs Slew Rate
  • Voltage-Mode PWM Leading and Trailing-Edge Modulation Control
  • Input Voltage Feedforward Compensation
  • 2.9V to 5.5V High Speed 2A/4A MOSFET Gate Drivers
  • Tri-state for Power Stage Shutdown
  • Internal Linear Regulator (LR) - 5.5V Bias from VIN
  • External LR Drive for Optimal Thermal Performance
  • Voltage Margining with Independently Adjustable Upper and Lower Settings for System Stress Testing and Over Clocking
  • Reference Voltage I/O for DDR/Tracking Applications
  • Improved 0.591V Internal Reference with Buffered Output
  • ±0.68%/±1.0% Over Commercial/Industrial Range
  • Source and Sink Overcurrent Protections
  • Low-and High-Side MOSFET rDS(ON) Sensing
  • Overvoltage and Undervoltage Protections
  • Small Converter Size - QFN package
  • Oscillator Programmable from 250kHz to 2MHz
  • Differential Remote Voltage Sensing with Unity Gain
  • Programmable Soft-Start with Pre-Biased Load Capability
  • Power-Good Indication with Programmable Delay
  • EN Input with Voltage Monitoring Capability
  • Pb-Free (RoHS Compliant)


 Block Diagram


Basic Information
Production Status
Mass Production
iSim Model
Input Voltage Min (V)
Input Voltage Max (V)
Output Voltage Min (V)
Output Voltage Max (V)
Output Current Max (A)
VBIAS (min)
2.9 V
VBIAS (max) (V)
Qualification Level
Bias Voltage Range (V)
2.9 to 5.5
Can Sample
Temperature Range
-40 to +85

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