LTC3851EMSE#PBF
ActiveDC/DC CONTROLLER, SYNCHRONOUS BUCK, 4 V TO 38 V SUPPLY, 1 OUTPUT, 99% DUTY CYCLE, 750KHZ, MSOP-EP-16
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LTC3851EMSE#PBF
ActiveDC/DC CONTROLLER, SYNCHRONOUS BUCK, 4 V TO 38 V SUPPLY, 1 OUTPUT, 99% DUTY CYCLE, 750KHZ, MSOP-EP-16
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Technical Specifications
Parameters and characteristics for this part
| Specification | LTC3851EMSE#PBF |
|---|---|
| Clock Sync | False |
| Control Features | Tracking, Enable, Soft Start, Frequency Control, Current Limit |
| Duty Cycle (Max) [Max] | 99 % |
| Frequency - Switching [Max] | 750 kHz |
| Frequency - Switching [Min] | 250 kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -40 °C |
| Output Configuration | Positive |
| Output Phases | 1 |
| Output Type | Transistor Driver |
| Package / Case | Exposed Pad, 16-TFSOP |
| Package / Case | 3 mm, 0.118 in |
| Supplier Device Package | 16-MSOP-EP |
| Synchronous Rectifier | True |
| Topology | Buck |
| Voltage - Supply (Vcc/Vdd) [Max] | 38 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 4 V |
LTC3851A-1 Series
Synchronous Step-Down Switching Regulator Controller
| Part | Clock Sync | Supplier Device Package | Operating Temperature [Max] | Operating Temperature [Min] | Number of Outputs | Function | Output Phases | Output Type | Mounting Type | Voltage - Supply (Vcc/Vdd) [Max] | Voltage - Supply (Vcc/Vdd) [Min] | Duty Cycle (Max) [Max] | Frequency - Switching [Min] | Frequency - Switching [Max] | Output Configuration | Control Features | Package / Case | Package / Case | Package / Case | Topology | Synchronous Rectifier | Package / Case |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Analog Devices | 16-SSOP | 85 °C | -40 °C | 1 | Step-Down | 1 | Transistor Driver | Surface Mount | 38 V | 4 V | 99 % | 250 kHz | 750 kHz | Positive | Current Limit Enable Frequency Control Soft Start Tracking | 0.154 in | 16-SSOP | 3.9 mm | Buck | |||
Analog Devices | 16-QFN (3x3) | 125 ¯C | -40 °C | 1 | Step-Down | 1 | Transistor Driver | Surface Mount | 38 V | 4 V | 99 % | 235 kHz | 750 kHz | Positive | Current Limit Enable Frequency Control Soft Start Tracking | 16-WFQFN Exposed Pad | Buck | |||||
Analog Devices | 16-MSOP-EP | 150 °C | -40 °C | 1 | Step-Down | 1 | Transistor Driver | Surface Mount | 38 V | 4 V | 99 % | 235 kHz | 750 kHz | Positive | Enable Frequency Control Power Good Soft Start Tracking | 16-TFSOP Exposed Pad | Buck | 0.118 in 3 mm | ||||
Analog Devices | 16-QFN (3x3) | 125 ¯C | -40 °C | 1 | Step-Down | 1 | Transistor Driver | Surface Mount | 38 V | 4 V | 99 % | 235 kHz | 750 kHz | Positive | Enable Frequency Control Power Good Soft Start Tracking | 16-WFQFN Exposed Pad | Buck | |||||
Analog Devices | 16-MSOP-EP | 85 °C | -40 °C | 1 | Step-Down | 1 | Transistor Driver | Surface Mount | 38 V | 4 V | 99 % | 250 kHz | 750 kHz | Positive | Current Limit Enable Frequency Control Soft Start Tracking | 16-TFSOP Exposed Pad | Buck | 0.118 in 3 mm | ||||
Analog Devices | 16-QFN (3x3) | 125 ¯C | -40 °C | 1 | Step-Down | 1 | Transistor Driver | Surface Mount | 38 V | 4 V | 99 % | 235 kHz | 750 kHz | Positive | Current Limit Enable Frequency Control Soft Start Tracking | 16-WFQFN Exposed Pad | Buck | |||||
Analog Devices | 16-MSOP-EP | 150 °C | -55 °C | 1 | Step-Down | 1 | Transistor Driver | Surface Mount | 38 V | 4 V | 99 % | 235 kHz | 750 kHz | Positive | Enable Frequency Control Power Good Soft Start Tracking | 16-TFSOP Exposed Pad | Buck | 0.118 in 3 mm | ||||
Analog Devices | 16-MSOP-EP | 125 ¯C | -40 °C | 1 | Step-Down | 1 | Transistor Driver | Surface Mount | 38 V | 4 V | 99 % | 235 kHz | 750 kHz | Positive | Enable Frequency Control Power Good Soft Start Tracking | 16-TFSOP Exposed Pad | Buck | 0.118 in 3 mm | ||||
Analog Devices | 16-MSOP-EP | 85 °C | -40 °C | 1 | Step-Down | 1 | Transistor Driver | Surface Mount | 38 V | 4 V | 99 % | 250 kHz | 750 kHz | Positive | Enable Frequency Control Power Good Soft Start Tracking | 16-TFSOP Exposed Pad | Buck | 0.118 in 3 mm | ||||
Analog Devices | 16-MSOP-EP | 125 ¯C | -40 °C | 1 | Step-Down | 1 | Transistor Driver | Surface Mount | 38 V | 4 V | 99 % | 250 kHz | 750 kHz | Positive | Enable Frequency Control Power Good Soft Start Tracking | 16-TFSOP Exposed Pad | Buck | 0.118 in 3 mm |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
Description
General part information
LTC3851A-1 Series
The LTC3851A-1 is a high performance synchronous step-down switching regulator 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.OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3851A-1 features a precision 0.8V reference and a power good indicator. A wide 4V to 38V (40V absolute maximum) input supply range encompasses most battery configurations and intermediate bus voltages.The TK/SS pin ramps the output voltage during start-up and shutdown with coincident or ratiometric tracking. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode operation, pulse-skipping mode or continuous inductor current mode at light loads and allows the IC to be synchronized to an external clock. The LTC3851A-1 contains an improved PLL compared to the LTC3851-1.The LTC3851A-1 is identical to the LTC3851A except that the ILIMpin is replaced by PGOOD.FeaturesLTC3851Not Recommended For New DesignsLTC3851-1Not Recommended For New DesignsLTC3851AAdjustable Current LimitLTC3851A-1PGOOD OutputApplicationsAutomotive SystemsTelecom SystemsIndustrial EquipmentDistributed DC Power Systems
Documents
Technical documentation and resources