LT1506IR-3.3

4.5A, 500kHz Step-Down Switching Regulator

DESCRIPTION

The LT ®1506 is a 500kHz monolithic buck mode switching regulator functionally identical to the LT1374 but optimized for lower input voltage applications. It will operate over a 4V to 15V input range compared with 5.5V to 25V for the LT1374. A 4.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability. Both fixed output voltage and adjustable parts are available.

FEATURES

■ Constant 500kHz Switching Frequency

■ Easily Synchronizable

■ Operates with Input as Low as 4V

■ Uses All Surface Mount Components

■ Inductor Size Reduced to 1.8µH

■ Saturating Switch Design: 0.07Ω

■ Shutdown Current: 20µA

■ Cycle-by-Cycle Current Limiting

APPLICATIONS

■ Portable Computers

■ Battery-Powered Systems

■ Battery Charger

■ Distributed Power