AX5510/5511系列为一颗电流模式构造, 脉波宽度调变输出的同步直流转换器，内部切换频率高达1.5MHz，不但可以省略一颗外部二极管组件，还可以大幅缩小外部组件，缩小电路板空间及节省组件成本。输入电压范围可由最低2.5伏特到最高5.5伏特，输出电压可以依需要调整最低可以至0.6伏特，而待机电流最大不会超过1毫安,非常适合于手持式产品, PDA，MP3 Player，数字相机，智能型手机…等装置的电压转换。

AX5510替代LM2968(NS),LT1949(Liner),FP6290(Feeling),TPS61085,TPS61087(TI),EL7516(intersil),EUP2624(EUP)等

GENERAL DESCRIPTION
    The AX5510 is a high performance, high efficiency step up DC-DC Converter with
integrated 3A. The AX5510 converter input voltage ranging from 2.6 to 5.5V. The Output voltage can be set up to 27V. The selectable frequency of 680 kHz and 1.2 MHz allows the use of small external inductors and capacitors and provides fast transient response. Current mode control with external compensation network makes it easy to stabilize the system and keep maximum flexibility. Programmable soft start function minimizes impact on the input power system. Internal power MOSFET with very low RDS (ON) provides high efficiency.
    The AX5510 automatically transits from PWM to PFM during light load condition further increasing efficiency. The converter also provides protection functions such as Current Limit and Thermal shutdown. The AX5510 is available in space-saving MSOP-10L-EP, MOSP-8L-EP, TDFN-10L and SOP-8L-EP packages.

FEATURES
- 2.6V to 5.5V operating input voltage range
- Adjustable output voltage range up to 27V
- Up to 3A output switch current
- 680K/1.2MHz Selectable Switching Frequency
- Programmable soft-start function
- External Compensation Network
- Current limit and Thermal shutdown protection
- Under voltage Lockout
- ≤ 1μA Shutdown Current
- Available in the Pb-Free MSOP-10L-EP,MSOP-8L-EP,TDFN-10L and SOP-8L-EPPackages