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 | Status | Product series | L (µH) | IR (A) | ISAT (A) | fres (MHz) | Mount | IRP,40K (A) | ISAT,30% (A) | RDC typ. (mΩ) | RDC max. (mΩ) | Samples | |
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744028004 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-TPC SMT Tiny Power Inductor | 4.7 | 0.85 | 0.7 | 70 | SMT | – | – | 265 | 310 | |||
74439358047 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-XHMI SMT Power Inductor | 4.7 | 9.5 | – | 22 | SMT | 13.35 | 16.65 | 8.65 | 9.51 |
Order Code | Datasheet | Simulation | |
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744028004 | SPEC | ||
74439358047 | SPEC |
Samples |
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Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IR (A) | ISAT (A) | fres (MHz) | Mount | IRP,40K (A) | ISAT,30% (A) | RDC typ. (mΩ) | RDC max. (mΩ) | Samples |
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