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High Performance DC/DC Controllers

High Performance DC/DC Controllers
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High Performance DC/DC Controllers ^^^F TECHNOLOGY

DC/DC Converter Topologies Step-Down (Buck) Converter SEPIC Converter V,N Above, Below or Equal to V0UT Synchronous Step-Up (Boost) Converter More Efficient than a Standard Boost Flyback Converter Isolated and Non-Isolated; High VOUT/VIN Ratios; Simple Digital Power Synchronous Buck Converter Synchronous Step-Down (Buck) Converter More Efficient than a Standard Buck V,N Above, Below or Equal to V0UT; More Efficient than a SEPIC Step-Up (Boost) Converter Converts Positive Input Voltage to Negative Output Voltage Digital Control, Telemetry and Fault Logging

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L I N E A R H i g h P er f o r m an c e D C / D C C o n t r o ller s Single Output Buck DC/DC Controllers Linear Technology’s single output buck step-down DC/DC controllers provide up to 96 percent efficient step-down conversion. Output voltages are as low as 0.6V with currents up to 60 amps. Features include synchronous or nonsynchronous operation, onboard MOSFET drivers, low quiescent current, tracking, tight reference voltage accuracy, optional sense resistor, current mode or voltage mode control, and selectable and/or synchronizable operating frequency. Linear offers several hundred...

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STEP-DOWN (BUCK) DC/DC CONTROLLERS 3 Single Output Buck DC/DC Controllers • Sub Milliohm DCR Current Sensing • Advanced Current Mode Control For Ultralow Jitter • Selectable Current Sensing Limit • Programmable DCR Temperature Compensation • ± 0.5% 0.6V Output Voltage Accuracy • Programmable Fixed Frequency 250kHz to 770kHz • High Speed Differential Remote Sense Amplifier Actual Size Demo Board Actual Size Back LTC3866 Sub-Milliohm Synchronous Step-Down Schematic TK/SS ITEMP Additional Features All parts have peak or valley current mode control and a shutdown (run) pin (1) The maximum...

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L I N E A R H i g h P er f o r m an c e D C / D C C o n t r o ller s Single Output Buck DC/DC Controllers VIN up to 60V/100V LTC3891 Actual Size Demo Board (DC1695A) LTC3891 Features Wide VIN Range: 4V to 60V (65V Abs Max) • • Low Operating IQ: 50μA • Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V • RSENSE or DCR Current Sensing Actual Size Back LTC3891 High Voltage Synchronous Step-Down Schematic VIN 4V TO 60V 22µF VIN INTVCC 2.2µF LTC3891 TG FREQ 0.1µF 4.7µH SW 8mΩ VOUT 3.3V 150µF 5A BG SENSE+ SENSE VFB 100k INTVCC 31.6k No Rsense PGOOD 100k LTC3812-5 4.2 to 60 0.8 to 0.93 VIN 20 100kHz to...

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S te p - D o w n ( B uc k ) D C / D C C ontro l l ers PolyPhase Single Output DC/DC Controllers PolyPhase operation clocks multiple DC/DC converter channels out-of-phase. This significantly reduces the input and output ripple currents, resulting in higher efficiency and lower EMI, as well as enabling smaller input and output filtering components. LTC3829 3-Phase Synchronous Step-Down Schematic INTVCC 4.7µF VIN BOOST1 BOOST2 BOOST3 SW3 SW2 SW1 5k TG1 SW1 BG1 PGND SENSE1+ SENSE1– TG2 SW2 BG2 100k 680pF 0.1µF 20k 20k VIN 22µF 6V TO 28V 35V ×3 + FREQ LTC3829 ITH SENSE2+ TK/SS SENSE2– SGND TG3...

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6 LINEAR HIGH PERFORMANCE DC/DC CONTROLLERS PolyPhase Multiple Output DC/DC Controllers Linear's PolyPhase multiple output DC/DC controllers provide up to three high current outputs with up to 95 percent efficiency. Features include multiphase operation, onPoard MOSFET drivers, synchronous or nonsynchronous rectification, low quiescent current, tracking, tight VREF accuracy and choice of current sense element. Other options include selectable, synchronizable switching frequency or constant on-time, tracking, along with DrMOS and power block compatibility. • Dual, 180° Phased Controllers...

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STEP-UP (BOOST), BUCK-BOOST, SEPIC, INVERTER AND FLYBACK CONTROLLERS 7 Boost DC/DC Controllers Linear Technology offers both synchronous and nonsynchronous boost controllers. Features include optional sense resistor, onboard LDO, 2-phase operation, high power gate drivers, programmable fixed switching frequency and low quiescent current. Efficiencies up to 97 percent can be achieved with synchronous operation. • Wide Input Voltage Range: 2.9V to 40V • Positive or Negative Output Voltage Programming with a Single Feedback Pin • Synchronous Operation For Highest Efficiency and Reduced Heat...

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8 LINEAR HIGH PERFORMANCE DC/DC CONTROLLERS Synchronous Buck-Boost DC/DC Controllers High performance 4-switch synchronous buck-boost controllers operate from an input voltage that is above, below or equal to the output voltage. These controllers utilize a single inductor and can deliver efficiencies up to 98 percent. • Single Inductor Allows V|N Above, Below or Equal • V,N Range 2.8V (Need EXTVCC > 6.4V) to 80V • Quad N-Channel MOSFET Gate Drivers • Synchronous Rectification: Up to 98% Efficiency Simplified Wide Voltage Range Synchronous Buck-Boost Schematic 50% Size Demo Board Actual Size...

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S te p - U p ( B oost ) , B uc k - B oost, S e p ic , I nverter and F ly bac k C ontro l l ers SEPIC DC/DC Controllers SEPIC converters operate from an input voltage that is above, below or equal to the output voltage and provides output short-circuit protection. The SEPIC provides a simpler solution as compared to synchronous buck-boost controllers, but has a lower efficiency, power density and maximum output current. All of Linear’s boost controllers can be designed into a SEPIC converter. Only a select list of parts is shown below. For a complete list visit www.linear.com/LT3759 or...

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L I N E A R H i g h P er f o r m an c e D C / D C C o n t r o ller s Inverter DC/DC Controllers Inverting DC/DC controllers convert a positive input voltage to a negative output. Features include optional sense resistor, current mode control, integrated MOSFET driver, undervoltage lockout, selectable operating frequency, low quiescent current and wide input voltage range. LT3757 Features • Wide Input Voltage Range: 2.9V to 40V • LT3757 Actual Size Demo Board (DC1548A) Positive or Negative Output Voltage Programming with a Single Feedback Pin LT3757 Inverter Schematic VIN 5V TO 15V 47µF 16V...

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