AX3811A Datasheet | AXElite

AX3811A High Efficiency Fast Response, 2A, 18V Input Synchronous Step-Down Regulator  GENERAL DESCRIPTION AX3811A develops high efficiency synchronous stepdown DC-DC converter capable of delivering 2A load current. AX3811A operates over a wide input voltage range from 4.35V to 18V and integrates main switch and synchronous switch with very low R DS(ON) to minimize the conduction loss. AX3811A adopts the instant PWM architecture to achieve fast transient responses for high step down applications and high efficiency at light loads. In addition, it operates at pseudo-constant frequency of 500 k Hz under heavy load conditions to minimize the size of inductor and capacitor.  Features Low RDS(ON) for internal switches (top/bottom):140/130 mΩ 4.35-18V input voltage range 2A load current capability Instant PWM architecture to achieve fast transient responses Internal softstart limits the inrush current - 2% 0.6V reference - Ro HS pliant and Halogen Free - pact package: SOT23-6 Applications - Set Top Box - Portable TV - Access Point Router - DSL Modem - LCD TV 1/10 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.2 Nov.04, 2013  PIN ASSIGNMENT The package of AX3811A is SOT-23-6L; the pin assignment is given by: Name Description Boot-Strap pin. Supply high side gate driver. Decouple this pin to LX pin with 0.1u F ceramic cap. Ground pin Output feedback pin. Connect this pin to the center point of the output resistor divider (as shown in Figure 1) to program the output voltage: Vout=0.6- (1+R1/R2) Enable control. Pull high to turn on. Do not float. Input pin. Decouple this pin to GND pin with at least 10u F ceramic cap Inductor pin. Connect this pin to the switching node of inductor (Top View) BS 1 GND 2 FB 3 6 LX 5 IN 4 EN BS GND FB EN IN LX SOT-23-6L  ORDER/MARKING INFORMATION Order Information Top Marking AX3811A X X Package Type Packing C: SOT-23-6L Blank: Tube A : Taping N BX Y Z Lot Number Code Week Code...