AX3123

AX3123 23V, 1.8A, 1.4MHz Asynchronous Step-Down DC/DC Converter  GENERAL DESCRIPTION The AX3123 is a monolithic step-down switch mode converter with a built-in power MOSFET. It achieves 1.8A output current over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-by-cycle current limit and over temperature protection. The AX3123 requires a minimum number of available standard external components. The AX3123 is available in SOT-23-6L, TSOT-23-6L packages.  FEATURES 1.8A Output Current 180mΩ Internal Power MOSFET Switch Stable with Low ESR Output Ceramic Capacitors Up to 92% Efficiency Fixed 1.4MHz Frequency Current Mode Operation Over-Temperature Protection with Hiccup-Mode Cycle-by-Cycle Over Current Protection Wide 4.5V to 23V Operating Input Range Output Adjustable from 0.805V to 15V 10μA Shutdown Current Miniature Packages: SOT-23-6L and TSOT-23-6L 1/13 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.0 Apr.17, 2012 AX3123  BLOCK DIAGRAM VIN EN UVLO & POR 950K ISEN Internal Regulator VCC OVP OTP VCC BS Oscillator Current Comparator OVP OTP UVLO Current Limit High-Side MOSFET PWM Control Driver Logic SW S R FB Error Amplifier CCOMP 0.805V RCOMP GND 2/13 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.0 Apr.17, 2012 AX3123  PIN ASSI...