DESCRIPTION

The A7523 is a compact, high efficiency, and low voltage step-up DC/DC converter with an Adaptive Current Mode PWM control loop, includes an error amplifier, ramp generator, comparator, switch pass element and driver in which providing a stable and high efficient operation over a wide range of load currents. It operates in stable waveforms without external compensation.

The low start-up input voltage below 1V makes A7523 suitable for 1 to 4 battery cells applications of providing up to 600mA output current. Besides, the 14μA low quiescent current together with high efficiency maintains long battery lifetime. The output voltage is set with two external resistors. Both internal 2A switch and driver for driving external power devices (NMOS or NPN) are provided.

The A7523 is available in SOT-26 package.

FEATURES

? 0.8V（Iout=1mA） Low Start-up Input Voltage

? 500kHz Fixed Switching Frequency

? 90 Efficiency

? High Supply Capability to Deliver 3.3V 300mA with1 Alkaline Cell or Deliver 5V 800mA with 1 Li-ion Cell

? 14μA Quiescent (Switch-off) Supply Current

? 0.01μA Shutdown Mode Supply Current

? Providing Flexibility for Using Internal and External Power Switches

? Output voltage: Settable to between 2.0V to 6.0V ,accuracy of 2

? Available in SOT-26 package.

APPLICATION

? MP3

? PDA

? DSC

? LCD Panel

? RF-Tags

? Portable Instrument

? Wireless Equipment