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LT3500 - Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller

The LT3500 is a current mode PWM step-down DC/DC converter with an internal 2.3A switch. The wide input range of 3V to 40V makes the LT3500 suitable for regulating power from a wide variety of sources, including automotive batteries, 24V industrial supplies and unregulated wall adapters.

Resistor-programmable 250kHz to 2.2MHz frequency range and synchronization capability enable optimization between efficiency and external component size. Cycle-by- cycle current limit, frequency foldback and thermal shutdown provide protection against a shorted output. The soft-start feature controls the ramp rate of the output voltage, eliminating input current surge during start-up, and also provides output tracking.

The LT3500 contains an internal NPN transistor with feedback control which can be configured as a linear regulator or as a linear regulator controller.

The LT3500’s low current shutdown mode (<12μA) enables easy power management in battery-powered systems.

Features Wide Input Range: 3V to 36V Operating, 40V Maximum Short-Circuit Protected Over Full Input Range 2A Output Current Capability Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2.2MHz Soft-Start/Tracking Capability Output Adjustable Down to 0.8V Adjustable Linear Regulator/Driver with 13mA Output Capability Power Good Comparator with Complimentary Outputs Low Shutdown Current: 12μA Thermally Enhanced 3mm × 3mm DFN or 16-Pin MSOP Package Typical Application

Applications Automotive Battery Regulation Industrial Control Wall Transformer Regulation Distributed Power Regulation Packaging

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