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Analog Devices LTC3110 | Demoboard Design Note 558
Bidirectional DC/DC Regulator and Supercapacitor Charger
Overview
| Topology | Buck-Boost Converter |
| Input voltage | 3.2-3.5 V |
| Switching frequency | 300-1500 kHz |
| Output 1 | 3.3 V |
Description
The LTC®3110 bidirectional buck-boost DC/DC regulatorcharges and balances a supercapacitor when a busvoltage is present (for example 3.3V) and dischargesthe supercapacitor into the load when the bus fails.The LTC3110 maintains the bus’s nominal level (3.3V inthe example in Figure 1) even if the supercapacitorvoltage is above or below the nominal bus voltage.Supporting the load this way allows data backup andretention during a power interruption—important in awide variety of industrial and automotive applications.
Features
- VCAP Operating Range: 0.1V to 5.5V
- VSYS Operating Range: 1.71V to 5.25V
- Automatic Switchover from Charge to Backup Mode
- Programmable ±2% Accurate Charge Input Current Limit from 125mA to 2A
- ±1% Backup Voltage Accuracy
- Automatic Backup Capacitor Balancing
- Fixed 1.2MHz Switching Frequency
- Burst Mode® Operation: 40μA Quiescent Current
- Built-In Programmable Multipurpose Comparator with Open-Collector Outputn Open-Collector Outputs to Indicate Direction ofOperation and End of Charge
- Thermally Enhanced TSSOP-24 and 4mm × 4mm QFN-24 Packages
Typical applications
- Supercapacitor Backup Converter and Charger / Battery Backup Converter and Charger
- RF Systems with Battery/Capacitor Backup
- Servers, RAID Systems
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-LHMI SMT Power Inductor, 2.2 µH, 3.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance2.2 µH | Performance Rated Current3.5 A | Saturation Current @ 10%3.2 A | Saturation Current @ 30%6.2 A | DC Resistance80 mΩ | Self Resonant Frequency55 MHz | MountSMT | ||||
| WE-LHMI SMT Power Inductor, 2.2 µH, 4.75 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance2.2 µH | Performance Rated Current4.75 A | Saturation Current @ 10%6.4 A | Saturation Current @ 30%11.9 A | DC Resistance50 mΩ | Self Resonant Frequency46 MHz | MountSMT | ||||
| WE-LHMI SMT Power Inductor, 5.6 µH, 2.15 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance5.6 µH | Performance Rated Current2.15 A | Saturation Current @ 10%1.95 A | Saturation Current @ 30%3.65 A | DC Resistance208 mΩ | Self Resonant Frequency28 MHz | MountSMT | ||||
| WE-LHMI SMT Power Inductor, 5.6 µH, 2.85 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance5.6 µH | Performance Rated Current2.85 A | Saturation Current @ 10%3.7 A | Saturation Current @ 30%7 A | DC Resistance122 mΩ | Self Resonant Frequency21 MHz | MountSMT |