LTC3890 Series
60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
Manufacturer: Analog Devices Inc./Maxim Integrated
Catalog
60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
| Part | Function | Number of Outputs | Output Type | Topology | Duty Cycle (Max) [Max] | Synchronous Rectifier | Mounting Type | Operating Temperature [Min] | Operating Temperature [Max] | Control Features | Voltage - Supply (Vcc/Vdd) [Max] | Voltage - Supply (Vcc/Vdd) [Min] | Frequency - Switching [Min] | Frequency - Switching [Max] | Output Phases | Clock Sync | Supplier Device Package | Output Configuration | Package / Case [x] | Package / Case [y] | Package / Case |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Analog Devices Inc./Maxim Integrated | Step-Down Step-Up/Step-Down | 2 | Transistor Driver | Buck SEPIC | 99 % | Surface Mount | -40 °C | 150 °C | Enable Frequency Control Phase Control Power Good Soft Start Tracking | 60 V | 4 V | 105 kHz 350 kHz | 535 kHz 835 kHz | 2 | 32-QFN (5x5) | Positive | |||||
 Analog Devices Inc./Maxim Integrated | Step-Down | 2 | Transistor Driver | Buck | 99 % | Surface Mount | -40 °C | 150 °C | Enable Frequency Control Power Good Soft Start Tracking | 60 V | 4 V | 105 kHz 350 kHz | 535 kHz 835 kHz | 2 | 28-SSOP | Positive | 0.154 in | 3.9 mm | 28-SSOP | ||
Analog Devices Inc./Maxim Integrated | Step-Down Step-Up/Step-Down | 2 | Transistor Driver | Buck SEPIC | 99 % | Surface Mount | -40 C | 125 °C | Enable Frequency Control Power Good Soft Start Tracking | 60 V | 4 V | 105 kHz 350 kHz | 535 kHz 835 kHz | 2 | 28-SSOP | Positive | 0.154 in | 3.9 mm | 28-SSOP | ||
Analog Devices Inc./Maxim Integrated | Step-Down | 2 | Transistor Driver | Buck | 99 % | Surface Mount | -55 °C | 150 °C | Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking | 60 V | 4 V | 105 kHz 350 kHz | 535 kHz 835 kHz | 2 | 32-QFN (5x5) | Positive | |||||
 Analog Devices Inc./Maxim Integrated | Step-Down | 2 | Transistor Driver | Buck | 99 % | Surface Mount | -55 °C | 150 °C | Enable Frequency Control Power Good Soft Start Tracking | 60 V | 4 V | 105 kHz 350 kHz | 535 kHz 835 kHz | 2 | 28-SSOP | Positive | 0.154 in | 3.9 mm | 28-SSOP | ||
Analog Devices Inc./Maxim Integrated | Step-Down | 2 | Transistor Driver | Buck | 99 % | Surface Mount | -40 °C | 150 °C | Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking | 60 V | 4 V | 105 kHz 350 kHz | 535 kHz 835 kHz | 2 | 32-QFN (5x5) | Positive | |||||
 Analog Devices Inc./Maxim Integrated | Step-Down | 2 | Transistor Driver | Buck | 99 % | Surface Mount | -40 C | 125 °C | Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking | 60 V | 4 V | 105 kHz 350 kHz | 535 kHz 835 kHz | 2 | 32-QFN (5x5) | Positive | |||||
Analog Devices Inc./Maxim Integrated | Step-Down Step-Up/Step-Down | 2 | Transistor Driver | Buck SEPIC | 99 % | Surface Mount | -40 °C | 150 °C | Enable Frequency Control Phase Control Power Good Soft Start Tracking | 60 V | 4 V | 105 kHz 350 kHz | 535 kHz 835 kHz | 2 | 32-QFN (5x5) | Positive | |||||
Analog Devices Inc./Maxim Integrated | Step-Down | 2 | Transistor Driver | Buck | 99 % | Surface Mount | -40 C | 125 °C | Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking | 60 V | 4 V | 105 kHz 350 kHz | 535 kHz 835 kHz | 2 | 32-QFN (5x5) | Positive | |||||
Analog Devices Inc./Maxim Integrated | Step-Down Step-Up/Step-Down | 2 | Transistor Driver | Buck SEPIC | 99 % | Surface Mount | -40 C | 125 °C | Enable Frequency Control Phase Control Power Good Soft Start Tracking | 60 V | 4 V | 105 kHz 350 kHz | 535 kHz 835 kHz | 2 | 32-QFN (5x5) | Positive |
Description
AI
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