The FAN6520B makes simple work out of implementing a complete control and protection scheme for a DC-DC stepdown converter.

Designed to drive N-channel MOSFETs in a synchronous buck topology, the FAN6520B integrates the control, output adjustment, monitoring and protection functions into a single 8-lead package.

The FAN6520B is easy to use, employs a single feed-back loop, and voltage-mode control with fast transient response. The output voltage can be precisely regulated to as low as 0.8V, with a maximum tolerance of ±1.5% over temperature and line voltage variations. A fixed frequency oscillator reduces design complexity, while balancing typical application cost. The error amplifier features a 15MHz gain-bandwidth product and an 8V/µs slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty cycles range from 0% to 100%.

The FAN6520B is rated for operation from 0° to +70°C with the FAN6520BI rated from -40° to +85°C.

• Accepts 1.5V to 5V forV_IN

• Output Range 0.8V to V_IN
  • 0.8V Internal Reference
  • ±1.5% Over Line Voltage and Temperature
• Drives N-Channel MOSFETs
• Simple Single-Loop Control Design
  • Voltage-Mode PWM Control
• Fast Transient Response
  • High-Bandwidth Error Amplifier
  • Full 0% to 100% Duty Cycle
• Small Converter Size
  • 300kHz Fixed Frequency Oscillator
  • Internal Soft-Start
  • 8-Lead SOIC

• Power Supplies for PC Subsystems and Peripherals
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• DSP, Memory
• Low-Voltage Distributed Power Supplies
• ACPI Power Control
• 5V Input DC-DC Regulator