FAN6520A Datasheet | Fairchild Semiconductor

Features - Output Range: 0.8V to VIN Description The FAN6520A simplifies implementing a plete control and protection scheme for a DC-DC stepdown converter. Designed to drive N-channel MOSFETs in a synchro-nous buck topology, the FAN6520A integrates the control, output adjustment, monitoring, and protection functions into a single 8-lead package. The FAN6520A 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 plexity, while balancing typical application cost. The error amplifier features a 15MHz gainbandwidth 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. - - - - - - 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 Lossless, Programmable, Over-Current Protection - Uses Upper MOSFET’s RDS(ON) Small Converter Size - 300k Hz 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 Ordering Information Part Number FAN6520AM FAN6520AMX FAN6520AIM FAN6520AIMX Temperature Range 0°C to 70°C 0°C to 70°C - 40°C...