LTC3891EUDC#PBF
ActiveDC/DC CONTROLLER, SYNCHRONOUS BUCK, 4V TO 60V SUPPLY, 1 OUTPUT, 99% DUTY CYCLE, 835KHZ, QFN-EP-20
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LTC3891EUDC#PBF
ActiveDC/DC CONTROLLER, SYNCHRONOUS BUCK, 4V TO 60V SUPPLY, 1 OUTPUT, 99% DUTY CYCLE, 835KHZ, QFN-EP-20
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Technical Specifications
Parameters and characteristics for this part
| Specification | LTC3891EUDC#PBF |
|---|---|
| Clock Sync | False |
| Control Features | Soft Start, Enable, Frequency Control, Power Good, Tracking, Current Limit |
| Duty Cycle (Max) [Max] | 99 % |
| Frequency - Switching [Max] | 535 kHz, 835 kHz |
| Frequency - Switching [Min] | 350 kHz, 105 kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 125 °C |
| Operating Temperature [Min] | -40 C |
| Output Configuration | Positive |
| Output Phases | 1 |
| Output Type | Transistor Driver |
| Package / Case | 20-WFQFN Exposed Pad |
| Supplier Device Package | 20-QFN (3x4) |
| Synchronous Rectifier | True |
| Topology | Buck |
| Voltage - Supply (Vcc/Vdd) [Max] | 60 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 4 V |
LTC3891 Series
Low IQ, 60V Synchronous Step-Down Controller
| Part | Output Phases | Voltage - Supply (Vcc/Vdd) [Max] | Voltage - Supply (Vcc/Vdd) [Min] | Clock Sync | Control Features | Supplier Device Package | Duty Cycle (Max) [Max] | Topology | Output Configuration | Number of Outputs | Synchronous Rectifier | Mounting Type | Package / Case | Output Type | Frequency - Switching [Min] | Frequency - Switching [Max] | Operating Temperature [Min] | Operating Temperature [Max] | Function | Package / Case |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Analog Devices Inc./Maxim Integrated | 1 | 60 V | 4 V | Current Limit Enable Frequency Control Power Good Soft Start Tracking | 20-QFN (3x4) | 99 % | Buck | Positive | 1 | Surface Mount | 20-WFQFN Exposed Pad | Transistor Driver | 105 kHz 350 kHz | 535 kHz 835 kHz | -40 C | 125 °C | Step-Down | |||
Analog Devices Inc./Maxim Integrated | 1 | 60 V | 4 V | Current Limit Enable Frequency Control Power Good Soft Start Tracking | 20-QFN (3x4) | 99 % | Buck | Positive | 1 | Surface Mount | 20-WFQFN Exposed Pad | Transistor Driver | 105 kHz 350 kHz | 535 kHz 835 kHz | -40 °C | 150 °C | Step-Down | |||
Analog Devices Inc./Maxim Integrated | 1 | 60 V | 4 V | Current Limit Enable Frequency Control Power Good Soft Start Tracking | 20-QFN (3x4) | 99 % | Buck | Positive | 1 | Surface Mount | 20-WFQFN Exposed Pad | Transistor Driver | 105 kHz 350 kHz | 535 kHz 835 kHz | -40 C | 125 °C | Step-Down | |||
Analog Devices Inc./Maxim Integrated | 1 | 60 V | 4 V | Current Limit Enable Frequency Control Power Good Soft Start Tracking | 20-QFN (3x4) | 99 % | Buck | Positive | 1 | Surface Mount | 20-WFQFN Exposed Pad | Transistor Driver | 105 kHz 350 kHz | 535 kHz 835 kHz | -55 °C | 150 °C | Step-Down | |||
 Analog Devices Inc./Maxim Integrated | 1 | 60 V | 4 V | Current Limit Enable Frequency Control Power Good Soft Start Tracking | 20-TSSOP-EP | 99 % | Buck | Positive | 1 | Surface Mount | 20-TSSOP Exposed Pad | Transistor Driver | 105 kHz 350 kHz | 535 kHz 835 kHz | -55 °C | 150 °C | Step-Down | 0.173 " 4.4 mm | ||
Analog Devices Inc./Maxim Integrated | 1 | 60 V | 4 V | Current Limit Enable Frequency Control Power Good Soft Start Tracking | 20-QFN (3x4) | 99 % | Buck | Positive | 1 | Surface Mount | 20-WFQFN Exposed Pad | Transistor Driver | 105 kHz 350 kHz | 535 kHz 835 kHz | -40 C | 125 °C | Step-Down | |||
 Analog Devices Inc./Maxim Integrated | 1 | 60 V | 4 V | Current Limit Enable Frequency Control Power Good Soft Start Tracking | 20-TSSOP-EP | 99 % | Buck | Positive | 1 | Surface Mount | 20-TSSOP Exposed Pad | Transistor Driver | 105 kHz 350 kHz | 535 kHz 835 kHz | -40 C | 125 °C | Step-Down | 0.173 " 4.4 mm | ||
 Analog Devices Inc./Maxim Integrated | 1 | 60 V | 4 V | Current Limit Enable Frequency Control Power Good Soft Start Tracking | 20-TSSOP-EP | 99 % | Buck | Positive | 1 | Surface Mount | 20-TSSOP Exposed Pad | Transistor Driver | 105 kHz 350 kHz | 535 kHz 835 kHz | -40 C | 125 °C | Step-Down | 0.173 " 4.4 mm | ||
Analog Devices Inc./Maxim Integrated | 1 | 60 V | 4 V | Current Limit Enable Frequency Control Power Good Soft Start Tracking | 20-TSSOP-EP | 99 % | Buck | Positive | 1 | Surface Mount | 20-TSSOP Exposed Pad | Transistor Driver | 105 kHz 350 kHz | 535 kHz 835 kHz | -55 °C | 150 °C | Step-Down | 0.173 " 4.4 mm | ||
Analog Devices Inc./Maxim Integrated | 1 | 60 V | 4 V | Current Limit Enable Frequency Control Power Good Soft Start Tracking | 20-TSSOP-EP | 99 % | Buck | Positive | 1 | Surface Mount | 20-TSSOP Exposed Pad | Transistor Driver | 105 kHz 350 kHz | 535 kHz 835 kHz | -40 °C | 150 °C | Step-Down | 0.173 " 4.4 mm |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
Description
General part information
LTC3891 Series
The LTC3891 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage. A constant frequency current mode architecture allows a phase-lockable frequency of up to 750kHz.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 LTC3891 features a precision 0.8V reference and power good output indicator. A wide 4V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. The output voltage of the LTC3891 can be programmed between 0.8V to 24V.The TRACK/SS pin ramps 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.ApplicationsAutomotive Always-On SystemsBattery Powered Digital DevicesDistributed DC Power Systems
Documents
Technical documentation and resources