A8586-2中文资料Wide Input Voltage, Adjustable Frequency, 3.5 Amp Buck Regulator数据手册Allegro规格书

描述 Description

The A8586 is a high frequency step-down switching regulatorwith an integrated high-side power MOSFET. It provides up3.5 A output current. The A8586 can achieve fast transientresponse utilizing current mode control and simple externalcompensation.

The wide input range of 3.8 V to 36 V makes the A8586 suitablefor a wide range of step-down applications, including those inan automotive input environment. Battery driven applicationsbenefit from the low 30 μA operational quiescent current.

The A8586 provides maintains high efficiency across a wideload range by the use of pulse frequency modulation (PFM)as the load reduces. This in turn reduces switching and gatedriver losses at light load. A8586-1 and A8586-2 are optionsthat disable the PFM function. A8586-1 also disables thedithering feature. These can be useful when low output rippleand minimum output capacitance is required.

Frequency fold back helps prevent inductor current runawayduring startup and provides enhanced dropout performance.Extensive protection features of the A8586 include pulse-by-pulsecurrent limit, hiccup mode short circuit protection, open/short freewheeling diode protection, BOOT open/short voltageprotection, VIN undervoltage lockout, and thermal shutdown.

The A8586 and A8586-2 are designed to aid in EMC/EMIdesign by including frequency dithering, soft freewheel diodeturn off, and well controlled switch node slew rates. A 4 MHzoscillator allows the A8586 to switch outside EMI sensitivefrequencies bands such as the AM band or ADSL bands.

The A8586 is available in industry standard DFN10 or SOIC8packages.

Applications

High Voltage Power ConversionAutomotive SystemsIndustrial Power SystemDistributed Power SystemsBattery Powered Systems

特性 Features

• Automotive AEC-Q100 qualified
• Supply voltage from 3.8 V to 36 V
• Output voltage adjustable from 0.8 V to 30 V
• Maximized duty cycle for low dropout operation
• Low 30 μA operational quiescent current
• 150 mΩ integrated MOSFET switch
• Programmable switching frequency up to 4 MHz
• Improved EMC with frequency dithering (A8586 and A8586-2) and controlled switch node rise and fall times
• Ceramic capacitor stable
• Internal soft start
• Over current protection