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LTC3649 - 60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output

The LTC®3649 is a high efficiency 60V, 4A synchronous monolithic step-down regulator. The regulator features a single resistor programmable output voltage, internal compensation and high efficiencies over a wide VOUT range.

The step-down regulator operates from an input voltage range of 3.1V to 60V and provides an adjustable rail-to-rail output range from (VIN – 0.5V) to ground while delivering up to 4A of output current. The switching frequency is also adjusted with an external resistor. A user-selectable mode input is provided to allow the user to trade off ripple noise for efficiency at light loads; Burst Mode operation provides the highest efficiency at light loads, while forced continuous mode provides low output ripple. The MODE/ SYNC pin can also be used to allow the user to synchronize the switching frequency to an external clock.

The LTC3649 operates with a peak current mode architecture that allows for fast transient response with inherent cycle-to-cycle current limit protection. It also features programmable output current limit, current monitoring and input voltage regulation.

Features Wide VIN Range: 3.1V to 60V Wide VOUT Range: 0V to (VIN – 0.5V) Single Resistor VOUT Programming Integrated 110mΩ Top N-Channel/50mΩ Bottom N-Channel MOSFETs 95% Efficiency with 12VIN and 5VOUT Regulated IQ: 440μA, Shutdown IQ: 15μA Accurate Current Monitoring (±4%) without Sense Resistor Accurate Resistor Programmable Frequency (300kHz to 3MHz) with ±50% Frequency Sync Range Accurate Programmable Output Current Input Voltage Regulation for MPPT Applications ±0.8% Output Voltage Accuracy Peak Current Mode Operation Programmable Wire Drop Compensation Burst Mode® Operation, Forced Continuous Mode Internal Compensation and Programmable Soft-Start Overtemperature Protection Available in Thermally Enhanced 28-Lead (4mm × 5mm) QFN and TSSOP Packages Typical Application

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