AX5511

AX5511 1.2MHz, High Voltage, Boost Converter  GENERAL DESCRIPTION The AX5511 is a current mode step up converter intended for small, low power applications. The converter input voltage ranging from 2.6V to 5.5V. The Output voltage can be set up to 27V. The frequency is 1.2MHz allows the use of small external inductors and capacitors and provides fast transient response. Internal soft start results in small inrush current and extends battery life. Internal power MOSFET with very low RDS (ON) provides high efficiency. The AX5511 automatically transits from PWM to PFM during light load condition further increasing efficiency. The converter also provides protection functions such as under-voltage lockout, current limit and thermal shutdown. The AX5511 is available in 5-pin TSOT-23 package.  FEATURES 2.6V to 5.5 V operating input voltage range Adjustable output voltage range up to 27V 1.2MHz Fixed Switching Frequency Internal soft-start function Current limit and Thermal shutdown protection Under voltage Lockout ≤ 1µA Shutdown Current Available in the 5-pin TSOT-23 Package  BLOCK DIAGRAM VCC EN Thermal Shutdown Soft Start Vref 1.238V FB UVLO Enable/ Disable Summing Comparator SW Control and Driver Logic Error Amplifier N-MOS Oscillator 1.2MHz GND Slope Compensation Current Sense 1/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.2 Oct.27, 2011 AX5511  PIN ASSIGNMENT The package of AX5511 is TSOT-23-5L; the pin assignment i...