Description
Designed to provide the power supply requirements of printers, office automation, industrial, and portable equipment, the A4491 provides three high current, high performance, switching regulator outputs in a single package, saving space, cost and component count.
High frequency switching allows selection of inexpensive inductors and small ceramic output capacitors. The turn-on cycles of the regulators are interleaved to minimize stresses on the input capacitors and to reduce EMI. Independent Enable pins simplify power sequencing and shutdown capabilities, and a power-on-reset (POR) circuit with user configurable delay indicates when enabled regulators are in specification.
Features and Benefits
▪ Three buck converters in a single package
▪ 4.5 to 23 V input voltage range
▪ 550 kHz fixed frequency
▪ Multiphase switching for smaller components and lower EMI
▪ Independent control of each converter for sequencing and shutdown control
▪ Power-on-reset flag with adjustable delay
▪ Internal compensation to minimize components and simply design
▪ 4 × 4 mm QFN Package, small PCB footprint
Applications:
▪ Photo, inkjet, and portable printers
• Set-top boxes
• Tablet computing
• Other Consumer Electronics applications
• Point-of-sale applications
• Security systems
• Gaming machines
• Other Industrial applications
(Picture:Pinout / Diagram)
