AX3484 – 340kHz Synchronous Rectified Step-Down Converter

AX3484 Datasheet PDF learn more.

Part number : AX3484

Functions : This is a kind of semiconductor. 340kHz Synchronous Rectified Step-Down Converter.

Pin arrangement :

Package information :

Manufacturer : AXElite

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AX3484 Datasheet PDF

The texts in the PDF file :

AX3484 3A, 23V, 340kHz Synchronous Rectified Step-Down Converter  GENERAL DESCRIPTION The AX3484 is a monolithic synchronous buck regulator. The device integrates two 100mΩ MOSFETs, and provides 3A of continuous load current over a wide input voltage of 4.75V to 23V. Current mode control provides fast transient response and Cycle-by-Cycle current limit. An adjustable soft-start prevents inrush current at turn-on, and in shutdown mode the supply current drops to 1μA. This device, available in an 8-pin SOP with exposed pad package, provides a very compact solution with minimal external components.  FEATURES – 3A Output Current – Wide 4.75V to 23V Operating Input Range – Integrated 100mΩ Power MOSFET Switches – Output adjust from VFB to 20V – Up to 95% Efficiency – Programmable Soft-Start – Stable with Low ESR Ceramic Output Capacitors VÛmw`R•yÑb€ – Fixed 350KHz Frequency – Cycle-by-Cycle Over Current Protection – Thermal shutdown and short circuit protections w.goftechm  BLOCK DIAGRAM CURRENT SENSE AMPLIFIER OSCILLATOR FB 5 90/350KHz 1 BS RAMP CLK 2 IN + 5V  + SS 8 0.925V S R Q Q M1 100mΩ + + ERROR AMPLIFIER 6μA – CURRENT COMPARATOR M2 100mΩ 3 SW 4 GND COMP 6 EN IN EN 7 7V Zener + 1.5V INTERNAL REGULATORS SHUTDOWN COMPARATOR 5V – 1/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.1 Sep.05, 2011 AX3484  PIN ASSIGNMENT The package of AX3484 is SOP-8L-EP; the pin assignment is given by: ( Top View ) BS IN SW GND 1 2 3 4 SOP-8L-EP GND 6 5 8 7 SS EN COMP FB

Description

High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel BS MOSFET switch. Connect a 0.01μF or greater capacitor from SW to BS to power the high side switch. Power Input. IN supplies the power to the IC, as well as the step-down converter IN switches. Drive IN with a 4.75V to 23V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC. See [ … ]

AX3484 PDF File



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