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Overview
| Topology | Boost Converter |
| IC revision | C |
Description
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.
Features
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
Typical applications
- Solid-State Drives
- Backup Capacitor Systems, Power Failure Backup Systems,
More information
Products
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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-TPC SMT Tiny Power Inductor, 0.056 µH, 4.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance0.056 µH | Rated Current4.5 A | Saturation Current6 A | Self Resonant Frequency2000 MHz | MountSMT | – | – | DC Resistance11.5 mΩ | DC Resistance15 mΩ | ||||
| WE-TPC SMT Tiny Power Inductor, 0.15 µH, 3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance0.15 µH | Rated Current3 A | Saturation Current3.6 A | Self Resonant Frequency800 MHz | MountSMT | – | – | DC Resistance18 mΩ | DC Resistance25 mΩ | ||||
| WE-TPC SMT Tiny Power Inductor, 0.33 µH, 2.8 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance0.33 µH | Rated Current2.8 A | Saturation Current2.4 A | Self Resonant Frequency550 MHz | MountSMT | – | – | DC Resistance27 mΩ | DC Resistance35 mΩ | ||||
| WE-TPC SMT Tiny Power Inductor, 0.47 µH, 2.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance0.47 µH | Rated Current2.5 A | Saturation Current2 A | Self Resonant Frequency350 MHz | MountSMT | – | – | DC Resistance36 mΩ | DC Resistance42 mΩ | ||||
| WE-TPC SMT Tiny Power Inductor, 0.82 µH, 2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance0.82 µH | Rated Current2 A | Saturation Current1.6 A | Self Resonant Frequency180 MHz | MountSMT | – | – | DC Resistance53 mΩ | DC Resistance65 mΩ | ||||
| WE-TPC SMT Tiny Power Inductor, 1 µH, 1.75 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance1 µH | Rated Current1.75 A | Saturation Current1.5 A | Self Resonant Frequency150 MHz | MountSMT | – | – | DC Resistance65 mΩ | DC Resistance85 mΩ | ||||
 | WE-XHMI SMT Power Inductor, 1 µH, 17 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-XHMI SMT Power Inductor | Inductance1 µH | Rated Current17 A | – | Self Resonant Frequency53 MHz | MountSMT | Performance Rated Current30.25 A | Saturation Current @ 30%38.15 A | DC Resistance2.1 mΩ | DC Resistance2.32 mΩ | ||||
| WE-TPC SMT Tiny Power Inductor, 2.2 µH, 1.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance2.2 µH | Rated Current1.3 A | Saturation Current1 A | Self Resonant Frequency100 MHz | MountSMT | – | – | DC Resistance125 mΩ | DC Resistance155 mΩ | ||||
| WE-XHMI SMT Power Inductor, 2.2 µH, 13 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-XHMI SMT Power Inductor | Inductance2.2 µH | Rated Current13 A | – | Self Resonant Frequency33 MHz | MountSMT | Performance Rated Current21.85 A | Saturation Current @ 30%26.45 A | DC Resistance3.7 mΩ | DC Resistance4.07 mΩ | ||||
| WE-TPC SMT Tiny Power Inductor, 3.3 µH, 1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance3.3 µH | Rated Current1 A | Saturation Current0.85 A | Self Resonant Frequency80 MHz | MountSMT | – | – | DC Resistance185 mΩ | DC Resistance220 mΩ | ||||
| WE-XHMI SMT Power Inductor, 10 µH, 5.8 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-XHMI SMT Power Inductor | Inductance10 µH | Rated Current5.8 A | – | Self Resonant Frequency17 MHz | MountSMT | Performance Rated Current8.5 A | Saturation Current @ 30%13.5 A | DC Resistance19 mΩ | DC Resistance20.9 mΩ |