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LTC3860EUHPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3860EUHPBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LTC3860 3860f Typical applicaTion DescripTion Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Current Sharing The LTC®3860 is a dual, PolyPhase® synchronous step- down switching regulator controller for high current distributed power systems, digital signal processors, and othertelecomandindustrialDC/DCpowersupplies.Ituses a constant frequency voltage mode architecture combined with very low offset, high bandwidth error amplifiers and a remote output sense differential amplifier for excellent transient response and output regulation. The controller incorporates lossless inductor DCR current sensingtomaintaincurrentbalancebetweenphasesandto provide overcurrent protection. The chip operates from a VCC supply between 3V and 5.5V and is designed for step- down conversion from VIN between 3V and 24V to output voltages between 0.6V and VCC – 0.5V. The TRACK/SS pins provide programmable soft-start or tracking functions. Inductor current reversal is disabled duringsoft-starttosafelypowerprebiasedloads.Thecon- stant operating frequency can be synchronized to an exter- nalclockorlinearlyprogrammedfrom250kHzto1.25MHz. Up to six LTC3860 controllers can operate in parallel for 1-, 2-, 3-, 4-, 6- or 12-phase operation. The LTC3860 is available in a 32-pin 5mm × 5mm QFN package. FeaTures applicaTions n Constant Frequency Voltage Mode Control with Accurate Current Sharing n ±0.75% 0.6V Voltage Reference n Differential Remote Output Voltage Sense Amplifier n Multiphase Capability—Up to 12-Phase Operation n Programmable Current Limit n Safely Powers a Pre-Biased Load n Programmable or PLL-Synchronizable Switching Frequency Up to 1.25MHz n Lossless Current Sensing Using Inductor DCR or Precision Current Sensing with Sense Resistor n Fast and Accurate True Operational Error Amplifiers n VCC Range: 3V to 5.5V n VIN Range: 3V to 24V n Power Good Output Voltage Monitor n Output Voltage Tracking Capability n Programmable Soft-Start n Available in a 32- Pin 5mm × 5mm QFN Package n High Current Distributed Power Systems n Digital Signal Processor and ASIC Supplies n Telecom Systems n Industrial Power Supplies L , LT, LTC, LTM, PolyPhase, µModule, Linear Technology and the Linear logo are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6144194, 5055767 VINSNS VCC FREQ FB2 ILIM2 FB1 COMP1,2 SS1,2 IN VLOGIC VCC BOOST GND TG TS BG RUN1,2 ILIM1 ISNS1P ISNS1N ISNS2N ISNS2P LTC3860 PWM1 LTC4449 VIN VIN SW1 0.3µH SGND CLKIN VSNSOUT VSNSN VSNSP PWM2 PWM2 PWM1 470µF 1µF 0.22µF 0.22µF TG1 BG1 VCC VCC 0.22µF 100pF 1nF 0.1µF 220pF 12.7k 220 50k 2.32k 2.32k 20k 20k 33pF VOUT VIN VCC IN VLOGIC VCC BOOST GND TG TS BG LTC4449 SW2 0.3µH 0.22µF TG2 BG2 3860 TA01 330µF 4 VOUT 1.2V 50A IAVG |
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