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A4490 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A4490 Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 16 page Description Designed to provide the power supply requirements of printers, office automation, industrial, and portable equipment, the A4490providesthreehighcurrent,highperformance,switching regulator outputs with independent soft start. 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. A charge pump is used to provide the supply for driving the power switches, ensuring operation at very wide operating duty cycles and avoiding the need for power-draining clamp circuits. Apower-on-reset circuit with user configurable delay indicates when enabled regulators are in specification. The power-on- reset flag also indicates when the input voltage drops below specification, giving the system controller advance warning while the switchers continue to operate down to the shutdown level. Internal diagnostics provide comprehensive protection against overloads, input undervoltages, and overtemperatures. 4490-DS, Rev. 9 Features and Benefits ▪ Three buck converters ▪ 4.5 to 34 V input voltage range ▪ 550 kHz fixed frequency ▪ Multiphase switching ▪ Independent control of each converter ▪ Power-on-reset flag ▪ Internal compensation ▪ 4 × 4 mm QFN Package, small PCB footprint Triple Output Step-Down Switching Regulator Package: 20-contact QFN (suffix ES) A4490 Approximate size Continued on the next page… Microcontroller or Controller Logic VBB GND CP1 CP2 VCP PGND PORZ ENB1 ENB2 ENB3 CPOR VREG1 VREG2 VREG3 VDD A4490 VBB2 LX2 FB2 VBB3 LX3 FB3 VBB1 LX1 FB1 Typical Application |
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