Topology | Boost Converter |
Input voltage | 5 V |
Output 1 | 40 V |
Output 2 | 40 V |
IC revision | C |
The LTC®3643 is a bidirectional synchronous stepupcharger and step-down converter which efficientlycharges a capacitor array up to 40V from an input supplybetween 3V to 17V. When the input supply falls below theprogrammable power-fail threshold, the step-up chargeroperates in reverse as a synchronous step-down regulatorto power the system rail from the backup capacitor duringthis power interruption/failure condition.When charging the backup capacitor, an external lowvaluesense resistor may be used to maintain an accuratecurrent limit from the input supply or implementPowerPath™ functionality.The step-down converter operates at a 1MHz switchingfrequency, allowing small external components to beused. Low quiescent current during regulation maximizesthe energy usage from the backup capacitor.
Bidirectional Synchronous Boost CapacitorCharger/Buck Regulator for System Backupnn Wide Input Voltage Range: 3V to 17Vnn Up to 40V Capacitor Voltage Storage for HighEnergy Backupnn 2A Maximum CAP Charge Currentnn Integrated Power N-Channel MOSFETs(150mΩ Top and 75mΩ Bottom)nn Integrated Power N-Channel MOSFET for Output/CAPDisconnect (50mΩ)nn Input Current Limit During Chargingnn Fast 1MHz Switching Frequencynn ±1% Reference Accuracy for System Voltage Regulationnn Indicator Outputs for Charge Status and Input Power Failnn Low Profile 24-lead 3mm × 5mm QFN Package
Order Code | Datasheet | Simulation | Downloads | Product series | L (µH) | IR (A) | ISAT (A) | fres (MHz) | Mount | IRP,40K (A) | ISAT,30% (A) | RDC (mΩ) | RDC typ. (mΩ) | Samples | |
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744028004 | SPEC | 8 files | WE-TPC SMT Tiny Power Inductor | 4.7 | 0.85 | 0.7 | 70 | SMT | – | – | – | 265 | |||
74439358047 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 8 files | WE-XHMI SMT Power Inductor | 4.7 | 9.5 | – | 22 | SMT | 13.35 | 16.65 | 8.65 | – |
Order Code | Datasheet | Simulation | |
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744028004 | SPEC | ||
74439358047 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. |
Samples |
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Order Code | Datasheet | Simulation | Downloads | Product series | L (µH) | IR (A) | ISAT (A) | fres (MHz) | Mount | IRP,40K (A) | ISAT,30% (A) | RDC (mΩ) | RDC typ. (mΩ) | Samples |
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