DESCRIPTION
The AIC1553 is a step-down, current mode, DC/DC converter. It operates from 2.5V to 5.5V input voltage range and switches at 500KHz, allowing the use of tiny, low cost capacitors and inductors. The output voltage is adjustable from 0.75V to 5V. A built-in 0.6Ω switch allows up to 0.5A of output current at high efficiency.

FEATURES
• Tiny 5-Lead SOT-23 package
• Uses Tiny Capacitors and Inductor
• High Frequency Operation: 500KHz
• High Output Current: 500mA
• Low RDS(ON) Internal Switch: 0.6Ω
• High Efficiency: Up to 90%
• Current Mode Operation for Excellent Line and Load Transient Response
• Short-Circuit Protected
• Low Quiescent Current: 22µA
• Low Dropout Operation: 100% Duty Cycle
• Ultralow Shutdown Current: IQ < 1µA
• Peak Inductor Current Independent of Inductor Value
• Low Output Voltages: Down to 0.75V

APPLICATIONS
• Cellular Phones.
• PDAs and Handy-Terminals.
• CPU I/O Supplies.
• Cordless Phones.
• Notebook Chipset Supplies.
• Handheld Equipment