A4490: three-way output step-down switching regulator

A4490 for printer, office automation, industrial and portable power supply equipment, provide three way large current, high performance and switch voltage regulator output, equipped with independent soft start.

High frequency switch supports the use of low-cost output inductor and small ceramic capacitors.The turn - on cycles of The regulators are interleaved to minimize stresses on The input capacitors and to reduce EMI. The open cycle of mutual crisscross of voltage regulator, to maximize reduce stress on The input capacitor, and to reduce EMI.Charge pump is used to supply power to the power switch, ensure stable operation of large operation under the work cycle and avoid using the power absorbing clamp circuit.

When activate stabilizer in requirements specification limits, indicating with user configurable delay electric reset on the logo.When the input voltage drop below specifications, instructions on electric reset flag, to continue in work in switch is off, to the system controller warned in advance.

Internal diagnosis to provide comprehensive overload, input under voltage and over temperature protection.The A4490 The 20 - contact, 4 mm * 4 mm, 0.75 mm nominal total height QFN packages, bare bonding pad in order to enhance heat dissipation.Its packaging are lead-free products, fog and with 100% of tin plating.

application

• Pictures, inkjet, and portable printers
• industrial
• Handheld devices
• Portable applications

• Three step-down converter
• 4.5 to 34 V input voltage range
• Fixed frequency of 550 kHz
• Multiphase switch
• The converter control independently
• Electric reset on the logo
• Internal compensation
• 4 x 4 mm QFN packages, small PCB