LTC3857EUH#PBF
ActiveDC/DC CONTROLLER, SYNCHRONOUS BUCK, 4 TO 38V SUPPLY, 2 OUTPUT, 99.4% DUTY CYCLE, 900KHZ, QFN-EP-32
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LTC3857EUH#PBF
ActiveDC/DC CONTROLLER, SYNCHRONOUS BUCK, 4 TO 38V SUPPLY, 2 OUTPUT, 99.4% DUTY CYCLE, 900KHZ, QFN-EP-32
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Technical Specifications
Parameters and characteristics for this part
| Specification | LTC3857EUH#PBF |
|---|---|
| Clock Sync | False |
| Control Features | Power Good, Phase Control, Frequency Control, Tracking, Enable, Soft Start, Current Limit |
| Duty Cycle (Max) [Max] | 99.4 % |
| Frequency - Switching [Max] | 535 kHz, 835 kHz |
| Frequency - Switching [Min] | 350 kHz, 105 kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 2 |
| Operating Temperature [Max] | 125 °C |
| Operating Temperature [Min] | -40 C |
| Output Configuration | Positive |
| Output Phases | 2 |
| Output Type | Transistor Driver |
| Supplier Device Package | 32-QFN (5x5) |
| Synchronous Rectifier | True |
| Topology | Buck |
| Voltage - Supply (Vcc/Vdd) [Max] | 38 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 4 V |
| Part | Output Type | Synchronous Rectifier | Supplier Device Package | Mounting Type | Duty Cycle (Max) [Max] | Control Features | Frequency - Switching [Min] | Frequency - Switching [Max] | Function | Output Configuration | Output Phases | Voltage - Supply (Vcc/Vdd) [Min] | Voltage - Supply (Vcc/Vdd) [Max] | Clock Sync | Topology | Operating Temperature [Min] | Operating Temperature [Max] | Package / Case [x] | Package / Case [y] | Package / Case | Number of Outputs |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Analog Devices Inc./Maxim Integrated | Transistor Driver | 28-SSOP | Surface Mount | 99.4 % | Enable Frequency Control Power Good Soft Start Tracking | 105 kHz 350 kHz | 535 kHz 835 kHz | Step-Down | Positive | 2 | 4 V | 38 V | Buck | -40 C | 125 °C | 0.154 in | 3.9 mm | 28-SSOP | 2 | ||
Analog Devices Inc./Maxim Integrated | Transistor Driver | 28-SSOP | Surface Mount | 99.4 % | Enable Frequency Control Power Good Soft Start Tracking | 105 kHz 350 kHz | 535 kHz 835 kHz | Step-Down | Positive | 2 | 4 V | 38 V | Buck | -40 C | 125 °C | 0.154 in | 3.9 mm | 28-SSOP | 2 | ||
Analog Devices Inc./Maxim Integrated | Transistor Driver | 32-QFN (5x5) | Surface Mount | 99.4 % | Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking | 105 kHz 350 kHz | 535 kHz 835 kHz | Step-Down | Positive | 2 | 4 V | 38 V | Buck | -40 C | 125 °C | 2 | |||||
 Analog Devices Inc./Maxim Integrated | Transistor Driver | 32-QFN (5x5) | Surface Mount | 99.4 % | Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking | 105 kHz 350 kHz | 535 kHz 835 kHz | Step-Down | Positive | 2 | 4 V | 38 V | Buck | -40 C | 125 °C | 2 | |||||
 Analog Devices Inc./Maxim Integrated | Transistor Driver | 32-QFN (5x5) | Surface Mount | 99.4 % | Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking | 105 kHz 350 kHz | 535 kHz 835 kHz | Step-Down | Positive | 2 | 4 V | 38 V | Buck | -40 C | 125 °C | 2 | |||||
Analog Devices Inc./Maxim Integrated | Transistor Driver | 32-QFN (5x5) | Surface Mount | 99.4 % | Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking | 105 kHz 350 kHz | 535 kHz 835 kHz | Step-Down | Positive | 2 | 4 V | 38 V | Buck | -40 C | 125 °C | 2 |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
Description
General part information
LTC3857 Series
The LTC3857 is a high performance dual step-down switching regulator 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 ESR 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. The LTC3857 features a precision 0.8V reference and power good output indicators. A wide 4V to 38V 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 inductor current mode at light loads.For a leaded 28-lead SSOP package with a fixed current limit and one PGOOD output, without phase modulation or a clock output, see the LTC3857-1 data sheet.LTC3857LTC3857-1FeaturesAdjustable Current Limit, Clock Output, Phase Modulation, 2 PGOOD OutputsFixed Current Limit, One PGOOD OutputPackageQFN-32SSOP-28ApplicationsAutomotive Always-On SystemsBattery Operated Digital DevicesDistributed DC Power Systems
Documents
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