LTC3879Fast, Wide Operating Range No RSENSEStep-Down Controller | Voltage Regulators - DC DC Switching Controllers | 3 | Active | The LTC3879 is a synchronous step-down switching regulator controller optimized for high switching frequency and fast transient response. The constant on-time valley current mode architecture allows for a wide input range, including very low duty factor operation. No external sense resistor or slope compensation is required. System flexibility is offered through a user-programmable soft-start pin and independent RUN pin. The voltage ramping soft-start function can be programmed with a capacitor or made to track an external reference source.Operating frequency is set by an external resistor and compensated for variations in VINto offer excellent line stability. Discontinuous mode operation provides high efficiency during light load conditions. A forced continuous control pin allows the user to reduce noise and RF interference. Safety features include output overvoltage protection and programmable current limit with foldback. The current limit is user programmable.The LTC3879 allows operation from 4V to 38V at the input and from 0.6V to 90% VINat the output. The LTC3879 is available in a small 16-pin thermally enhanced MSOP or 3mm × 3mm QFN packages.ApplicationsDistributed Power SystemsEmbedded ComputingCommunications Infrastructure |
LTC3880Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management | PMIC | 5 | Active | The LTC3880/LTC3880-1 are dual, PolyPhase DC/DC synchronous step-down switching regulator controllers with an I2C-based PMBus compliant serial interface. The controllers use a constant frequency, current mode architecture that is supported by LTpowerPlay™software development tool with graphical user interface (GUI).Switching frequency, output voltage, and device address can be programmed using external configuration resistors. Parameters can be set via the digital interface or stored in EEPROM. Voltage, current, internal/external temperature and fault status can be read back through the bus interface. The LTC3880 incorporates a 5V linear regulator while the LTC3880-1 uses an external 5V supply for minimum power loss. See comparison to LTC3887 below.VOUTStart-Up TimeMax VOUT0/1Fast ADC Mode for 1 ParameterLTC3887/LTC3887-135ms5.5V/5.5VNoLTC3880/LTC3880-1120ms4V/5.4VNoApplicationsHigh Current Distributed Power SystemsTelecom, Datacom and Storage SystemsIntelligent Energy Efficient Power Regulation |
LTC3882-1LTC3882-2Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management | DC DC Switching Controllers | 4 | Active | The LTC3882-1/LTC3882-2 is a dual, PolyPhase DC/DC synchronous step-down switching regulator controller with PMBus compliant serial interface. It uses a constant frequency, leading-edge modulation, voltage mode architecture for excellent transient response and output regulation. Each PWM channel can produce output voltages from 0.1V to 5.25V using a wide range of 3.3V compatible power stages, including power blocks, DrMOS or discrete FET drivers. Up to four LTC3882-1 devices can operate in parallel for 2-, 3-, 4-, 6- or 8-phase operation.System configuration and monitoring is supported by the LTpowerPlay™software tool. The LTC3882-1/LTC3882-2 serial interface can read back input voltage, output voltage and current, temperature and fault status. Most operating parameters can be set via the digital interface or stored in internal EEPROM for use at power up. Switching frequency and phase, output voltage and device address can also be set using external configuration resistors.PWM Enable OutputTG/BG ControlHW Write ProtectDedicated PGOODDifferential VOUTSenseMax PWM FrequencyLTC3882YesYesYesNoVOUT0Only1.25MHzLTC3882-1NoNoNoYesVOUT0& VOUT11.25MHzLTC3882-2NoNoNoYesVOUT0& VOUT12.5MHzAPPLICATIONSHigh Current Distributed Power SystemsServers, Network and Storage EquipmentIntelligent Energy Efficient Power Regulation |
LTC3883LTC3883-1Single Phase Step-Down DC/DC Controller with Digital Power System Management | Voltage Regulators - DC DC Switching Controllers | 10 | Active | The LTC3883/LTC3883-1 are PolyPhase capable DC/DC synchronous step-down switching regulator controllers with a PMBus compliant serial interface. The controllers use a constant frequency, current mode architecture that is supported by the LTPowerPlay™software development tool with graphical user interface (GUI).Switching frequency, output voltage, and device address can be programmed using external configuration resistors. Additionally, parameters can be set via the digital interface or stored in on-chip EEPROM.The LTC3883/LTC3883-1 can be configured for Burst Mode®operation, discontinuous (pulse-skipping) mode or continuous inductor current mode. The LTC3883 incorporates an internal 5V linear regulator while the LTC3883-1 uses an external 5V supply for minimum power loss.The LTC3883/LTC3883-1 are available in a 32-lead 5mm × 5mm QFN package.ApplicationsHigh Current Distributed Power SystemsTelecom SystemsIntelligent Energy Efficient Power Regulation |
LTC3884LTC3884-1Dual Output PolyPhase Step-Down Controller with Sub-Milliohm DCR Sensing and Digital Power System Management | PMIC | 7 | Active | The LTC3884/LTC3884-1 are dual output PolyPhase DC/DC synchronous step-down switching regulator controllers with an I2C-based PMBus compliant serial interface. The controllers employ a constant-frequency current mode architecture, together with a unique scheme to provide excellent performance for sub-milliohm DCR applications. The LTC3884/LTC3884-1 are supported by the LTpowerPlay®software development tool with graphical user interface (GUI).Programmable loop compensation allows the controller to be compensated digitally. Switching frequency, channel phasing, output voltage, and device address can be programmed both by the digital interface as well as external configuration resistors. Additionally, parameters can be set via the digital interface or stored in EEPROM. Both outputs have independent power good indicators andFAULTfunction. The LTC3884 has integrated gate drivers.The LTC3884-1 has three-state PWM pins to drive power blocks or DrMOS power stages.APPLICATIONSTelecom, Datacom, and Storage SystemsIndustrial and Point-of-Load Applications |
LTC3886LTC3886-160V Dual Output Step-Down Controller with Digital Power System Management | Integrated Circuits (ICs) | 4 | Active | The LTC3886/LTC3886-1 is a dual PolyPhase DC/DC synchronous step-down switching regulator controller with I2C-based PMBus compliant serial interface. This controller employs a constant-frequency, current-mode architecture, with high voltage input and output capability along with programmable loop compensation. The LTC3886 is supported by the LTpowerPlay®software development tool with graphical user interface (GUI).The EXTVCC pin supports voltages up to 14V allowing for optimized circuit efficiency and die temperature, and for the controller output to supply the chip power. Switching frequency, output voltage, and device address can be programmed both by digital interface as well as external configuration resistors. Parameters can be set via the digital interface or stored in EEPROM. Both outputs have an independent power good indicator andFAULTfunction.The LTC3886 can be configured for discontinuous (pulse-skipping) mode or continuous inductor current mode. The LTC3886-1 also includes a sequencing off feature to discharge very large output capacitors.APPLICATIONSTelecom, Datacom, and Storage SystemsIndustrial and Point of Load Applications |
| Voltage Regulators - DC DC Switching Controllers | 6 | Active | The LTC3887/LTC3887-1/LTC3887-2 are dual, PolyPhase DC/DC synchronous step-down switching regulator controllers with an I2C-based PMBus compliant serial interface. The controllers use a constant frequency, current mode architecture that is supported by LTpowerPlay®a software development tool with graphical user interface (GUI).Switching frequency, channel phasing, output voltage, and device address can be programmed using external configuration resistors. Additionally, parameters can be set via the digital interface or stored in EEPROM. Voltage, current, internal/external temperature and fault status can be read back through the bus interface.The LTC3887 has integrated gate drivers. The LTC3887-1 has three-state PWM pins to drive DrMOS power stages. The LTC3887-2 has gate drivers and no LDO and supports VINup to 34V. The LTC3887 is an enhanced version of the LTC3880 with greater output voltage range and more digital features.ApplicationsHigh Current Distributed Power SystemsTelecom, Datacom and Storage SystemsIntelligent Energy Efficient Power Regulation |
LTC3888Dual Loop 8-Phase Step-Down DC/DC Controller with Digital Power System Management | DC DC Switching Controllers | 2 | Active | The LTC3888/LTC3888-1/LTC3888-2is a PMBus-compliant dual loop DC/DC synchronous step-down switching regulator controller with eight expandable phases supporting a wide range of master/slave configurations. The controller uses constant frequency current mode architecture to provide excellent transient response and output regulation. Each PWM master is capable of producing output voltages from 0.3V to 3.45V with multiple phase configurations using DrMOS devices that provide an output current monitor.PMBus configuration and monitoring is supported by LTpowerPlay™software. Programmable loop compensation and built-in load step emulation facilitate setting bandwidth based on input voltage and output load capacitance. PMBus commands allow read back of input voltage, output voltage and current, and operating status. Operating parameters can be set via PMBus command or stored in internal EEPROM for use at power up. Switching frequency, phase configuration, output voltage (LTC3888/LTC3888-2), output current limit (LTC3888-1) and device address can also be set using external programming resistors.APPLICATIONSHigh Current Distributed Power SystemsServers, Network and Storage Equipment |
LTC388960V Dual Output Step-Down Controller with Digital Power System Management | PMIC | 3 | Active | The LTC3889 is a dual PolyPhase DC/DC synchronous step-down switching regulator controller with I2C-based PMBus compliant serial interface. This controller employs a constant-frequency, current-mode architecture, with high voltage input and output capability along with programmable loop compensation. The LTC3889 is supported by the LTpowerPlay™software development tool with graphical user interface (GUI).The EXTVCCpin supports voltages up to 14V allowing for optimized circuit efficiency and die temperature, and for the controller output to supply the chip power. Switching frequency, output voltage, and device address can be programmed both by digital interface as well as external configuration resistors. Parameters can be set via the digital interface or stored in EEPROM. Both outputs have an independent power good indicator andFAULTfunction.The LTC3889 can be configured for discontinuous (pulse-skipping) mode or continuous inductor current mode.APPLICATIONSTelecom, Datacom, and Storage SystemsIndustrial and Point of Load Applications |
LTC3890-160V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller | PMIC | 13 | Active | The LTC3890 is a high performance dual step-down switching regulator DC/DC controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. Power loss and noise due to the ESR of the input capacitor are minimized by operating the two controller output stages out-of-phase.The 50μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP®compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3890 features a precision 0.8V reference and power good output indicators. A wide 4V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries.Independent TRACK/SS pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous conduction mode at light loads. For a leaded package version (28-lead Narrow SSOP), see the LTC3890-1 data sheet.LTC3890LTC3890-1LTC3890-2LTC3890-3Adjustable Current LimitLimitYesNoYesNoCLKOUT/PHASMD forMultiphase OperationYesNoYesNoNumber of PGoodOutputs2121OVP – Bottom GateCrowbarYesYesNoNoCurrent Limit FoldbackYesYesNoNoLight Load Operationwhen Synced to ExternalClockForced ContinuousForced ContinuousPulse SkippingPulse SkippingSENSE Pins CommonMode RangeCommon Mode < 0.5VRequires VFB < 0.65VCommon Mode < 0.5VRequires VFB < 0.65VNot Dependant onVFB. Easy to make anon-synchronousBoost or SEPICNot Dependant onVFB. Easy to make anon-synchronousBoost or SEPICPackage5 × 5 QFN-32SSOP-285 × 5 QFN-32SSOP-28ApplicationsAutomotive Always-On SystemsBattery Operated Digital DevicesDistributed DC Power Systems |
