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FAN6520A-FAN6520AM-FAN6520AMX
Single Synchronous Buck PWM Controller
Features Output Range 0.8V to V 0.8V Internal Reference ±1.5% Over Line V oltage and Temperature Drives N-Channel MOSFETs Simple Single-Loop Control Design oltage-Mode PWM Control
•Fast Transient Response High-Bandwidth Error Amplifier Full 0% to 100% Duty Cycle Lossless, Programmable Over-current Protection Uses Upper MOSFET’s R
DS(ON) Small Converter Size 300kHz Fixed Frequency Oscillator Internal Soft-Start 8-Lead SOIC
Applications•Power Supplies for PC Subsystems and Peripherals MCH, GTL, and AGP Supplies Cable Modems, Set Top Boxes, and DSL Modems DSP, Memory
•Low-Voltage Distributed Power Supplies
General DescriptionThe FAN6520A 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 FAN6520A integrates the control, output
adjustment, monitoring and protection functions into a single
8-lead package.
The FAN6520A is easy to use, employs a single feedback
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 IC monitors the drop across the upper MOSFET and
inhibits PWM operation appropriately to protect against
over-current conditions. This approach simplifies the
implementation and improves efficiency by eliminating
the need for a current sense resistor.
The FAN6520A is rated for operation from 0° to +70°C with
the FAN6520AI rated from –40° to +85°C.
