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DESCRIPTION

The AIC1577 is a current mode switching regulator controller that drives external N channel power MOSFET using a fixed frequency architecure. It usesexternal divider to adjust output voltage from 0.8V to 20V with excellent line and load regulation. A maximum high duty cycle limit of 95 provides low dropout operation which extends operating time in battery-operated systems.

FEATURES

N-Channel MOSFET Drive

Operating Input Voltage from 4.5V to 24V

Wide Ouput Range : 0.8V to 20V

±1.5 0.8V Reference

Low Dropout Operation : 95 Duty Cycle

500KHz Fixed Constant Frequency

Low Standby Current, IQTypically 720µA

Logic-Control Micropower Shutdown

Output Overvoltage Protection

Internal Diode for Bootstrapped Gate Drive

Current Mode Operation for Excellent Line and Load Transient Response

Available in an 8-Lead SO and MSOP Package

APPLICATIONS

LCD Monitor

Palmtop Computers, PDAs

Wireless Modems

On-Card Switching Regulators

DC Power Distribution Systems