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LTC3811 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3811 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 48 page  LTC3811 1 3811f TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION High Speed Dual, Multiphase Step-Down DC/DC Controller The LTC ®3811 is a dual, PolyPhase® synchronous step- down switching regulator controller optimized for output voltages up to 3.3V. The LTC3811 includes high bandwidth error amplifiers as well as a high speed differential remote sense amplifier. The sense voltage range is programmable from 24mV to 85mV, allowing the use of either the inductor DCR or a discrete sense resistor. Multiphase operation is made possible using the MODE/SYNC input, the CLKOUT output and the PHASEMODE control pin, allowing 1-, 2-, 3-, 4-, 6- or 12-phase operation. Large internal gate drivers minimize switching losses and allow the use of multiple power MOSFETs connected in parallel for high current applications. TheoperatingfrequencyoftheLTC3811canbeprogrammed from 250kHz to 750kHz and can also be synchronized to an external clock using the internal PLL. Tracking and sequencing are possible with the LTC3811, and soft-start is programmed with an external capacitor. Shutdown reduces supply current to 20μA. Dual Output, 2-Phase Tracking Core and I/O Supply ■ Fixed Frequency, Peak Current Mode Control ■ ±0.5% Output Accuracy Over Temperature ■ Optimized for Low VOUT Applications (Up to 3.3V) ■ Dual or Single Output, Multiphase Operation ■ Wide VIN Range: 4.5V to 30V Operation ■ High Speed Differential Remote Sense Amplifier ■ Inductor DCR or Sense Resistor Capable ■ Adjustable Peak Current Sense Voltage: 24mV to 85mV ■ Very Low Duty Cycle Operation: tON(MIN) = 65ns (Typ) ■ Powerful Internal Gate Drivers ■ Output Voltage Soft-Start, Tracking and Sequencing ■ Programmable Load Line for Reduced COUT ■ Clock Input and Output for Up to 12-Phase Operation ■ Fixed Frequency Operation from 250kHz to 750kHz ■ PLL Synchronization from 150kHz Up to 900kHz ■ Selectable CCM or DCM Operation ■ Available in 5mm × 7mm QFN and G36 Packages ■ Network Servers ■ High Current ASIC Supplies ■ Low Voltage Power Distribution , LT, LTC, LTM and PolyPhase are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 6304066, 5929620, 6177787, 6144194, 6580258, 5705919. SS/TRACK1 SS/TRACK2 SGND VIN DRVCC INTVCC LTC3811 TG1 BOOST1 TG2 BOOST2 SW1 SW2 BG1 RUN1 RUN2 SENSE1+ SENSE1– SENSE2+ SENSE2– DIFF/IN+ DIFF/IN– DIFF/OUT 3811 TA01a RNG1 VOUT2 1.5V 15A VIN 4.5V TO 14V RNG2 FB1 COMP1 FB2 COMP2 BG2 PGND VOUT1 2V 15A Load Step 20μs/DIV 3811 TA01b VIN = 12V VOUT = 2V IOUT = 0A to 12.5A VOUT 100mV/DIV IL 5A/DIV |
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