40V, 2A Synchronous Buck-Boost DC/DC Converter

The LTC3115-2 is a high voltage monolithic synchronous buck-boost DC/DC converter optimized for applications subject to fast (<1ms) input voltage transients. For all other applications, the LTC3115-1 is recommended. With its wide 2.7V to 40V input and output voltage ranges, the LTC3115-2 is well suited for use in a wide variety of automotive and industrial power supplies. A proprietary low noise switching algorithm optimizes efficiency with input voltages that are above, below or even equal to the output voltage and ensures seamless transitions between operational modes.

Programmable frequency PWM mode operation provides low noise, high efficiency operation and the ability to synchronize switching to an external clock. Switching frequencies up to 2MHz are supported to allow use of small value inductors for miniaturization of the application circuit. Pin selectable Burst Mode operation reduces standby current and improves light load efficiency which, combined with a 3µA shutdown current, make the LTC3115-2 ideally suited for battery-powered applications. Additional features include output disconnect in shutdown, short-circuit protection and internal soft-start. The LTC3115-2 is available in thermally enhanced 16-lead 4mm × 5mm × 0.75mm DFN and 20-lead TSSOP packages.

Features

LTC3115-1

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LTC3115-2

Optimized for applications subject to fast (<1ms) input voltage transients

Applications

* 24V/28V Industrial Applications

* Automotive Power Systems

* Telecom, Servers and Networking Equipment

* FireWire Regulator

* Multiple Power Source Supplies

* Wide VIN Range: 2.7V to 40V

* Wide VOUT Range: 2.7V to 40V

* 0.8A Output Current for VIN ≥ 3.6V, VOUT = 5V

* 2A Output Current in Step-Down Operation for VIN ≥ 6V

* Programmable Frequency: 100kHz to 2MHz

* Synchronizable Up to 2MHz with an External Clock

* Up to 95% Efficiency

* 30µA No-Load Quiescent Current in Burst Mode® Operation