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AP3586A：降压控制器

Description

The AP3586A/B/C is a compact synchronous -rectified buck controller specifically designed to operate from 5V or 12V supply voltage and deliver high-quality output voltage as low as 0.6V (AP3586A) or 0.8V (AP3586B/C). This device operates at fixed 300kHz (AP3586A/B) or 200kHz (AP3586C) frequency and provides an optimal level of integration to reduce size and cost of the power supply. This controller integrates internal MOSFET drivers that support 12V+12V bootstrapped voltage for highefficiency power conversion. The bootstrap diode is built-in to simplify the circuit design and minimize external part count. This controller provides single feedback loop, voltage-mode control with fast transient response. The error amplifier features a 10MHz gain-bandwidth product and 6V/μs slew rate which enables high converter bandwidth for fast transient performance. Other features include internal soft-start, under voltage protection, over current protection and shutdown function. With afore-mentioned functions, this part provides customers a compact, high efficiency, well-protected and cost-effective solutions. The AP3586A/B/C is available in SOIC-8 and PSOP-8 packages.

Application

• Subsystem Power Supplies
• PCI, AGP, Graphics Cards, Digital TV
• SSTL-2 and DDR/2/3 SDRAM Bus Termination Supply
• Cable Modems, Set Top Boxes, and DSL Modems
• Industrial

Features

• Supply Voltage: 5V/12V
• VIN Input Range: 3.3V to 12V
• 0.6V/0.8V to 82% of VIN Output Range
• Internal Reference: 0.6V/0.8V
• Simple Single-loop Control
• Voltage-mode PWM Control
• Duty Cycle: 0% to 82%
• Fast Transient Response
• 10MHz High-bandwidth Error Amplifier with 6V/μs Slew Rate
• Fixed Oscillator Frequency: 300kHz/200kHz
• Lossless, Programmable Over Current Protection (Uses Lower MOSFET RDS(ON) )
• Start-up into Pre-biased Load
• Built-in Thermal Shutdown
• Built-in Soft-start
• Over Current Protection
• Over Voltage Protection
• Under Voltage Protection
• Integrated Boot Diode

SO-8