发布者：来自网络 发布时间：2010/1/2 阅读：8363次    关键字： AX3504

AX3504/A     (2015年7月停产) General Description    The AX3504/A is a 1.2MHz constant frequency current mode PWM step-down converter. It is ideal for portable equipment requiring very high current up to 2A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The AX3504/A also can run at 100% duty cycle for low dropout operation, extending battery life in portable systems while light load operation provides very low output ripple for noise sensitive applications. The AX3504/A can supply up to 2A output load current from a 2.5V to 5.5V input voltage and the output voltage can be regulated as low as 0.6V. The high switching frequency minimizes the size of external components while keeping switching losses low. The internal slope compensation setting allows the device to operate with smaller inductor values to optimize size and provide efficient operation. The AX3504/A is available in adjustable (0.6V to VIN) output voltage. The device is available in SOP8 Pb-free and DFN-10L packages.   Features Input Range:5.5V Efficiency(%):88(0.5A) Availability:NOW Features:a,b,c,e,f,g Frequency:1.2Mhz Output Current:2.0A Output Voltage:Adj(0.6V) PackageType:SOT8,DFN10 AX3504/A Stanby Current:1uA(Max)   Applications OLPC,UMPC Notebook Computer Handheld Portable Device Step-Down Converters Requiring High Efficiency and 3A Output Current   Typical Application   AX3504 2A Syn. Buck -2.5V to 5.5V Input Voltage Range -Output Voltages from 0.6V to VIN - High Efficiency: Up to 95% - 1.2MHz Constant Frequency Operation - 2A Output Current - No Schottky Diode Required - Current Mode Operation for Excellent Line and Load Transient Response - Current limit, Enable function - Short Circuit Protect (SCP) - Build-in Soft Start function - ≤ 1µA Shutdown Current - SOP8 Pb-Free and DFN-10L packages P/N Package Features Vin Iout Vout Frequency Stanby Current Efficiency Data Sheet CMOS Step-down DC/DC AX3502 SOT23-5 a,b,c,e,f,g 5.5V 0.6A Adj(0.6V) 1.5Mhz 1uA(Max) 95%(0.5A) AX3503 SOT23-5 a,b,c,e,f,g 6V 1.0A Adj(0.6V) 1.5Mhz 1uA(Max) 92%(0.5A) AX3514 SOP-8,DFN10 a,b,c,e,f,g 5.5V 2.0A Adj(0.6V) 1.2Mhz 1uA(Max) 95%(0.5A) AX3505 SOP8-EP a,b,c,e,f,g,l 5.5V 1.0A*2 Adj(0.6V) 1.5Mhz 1uA(Max) 88%(0.5A) AX3506 SOP8-EP,DFN-10 a,b,c,e,f,g 5.5V 2.5A Adj(0.6V) 1.2Mhz 1uA(Max) 88%(0.5A) AX4101 AX4102                 a:Synchronous b:Internal switch c:Enable Pin d:Current limit setting e:Internal current limit f: Thermal Shutdown g:Power saving mode h:Voltage Reference i:UVLO j:Boost Pin k:External Compensation I:dual channel m:External sofe sart n:with LDO