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Analog Devices LTC7878 | Demoboard EVAL-LTC7878-BZ
70V Parallel Five-Phase 4-Switch Buck-Boost Controller
Overview
| Topology | Buck-Boost Converter |
| Input voltage | 40-65 V |
| Output 1 | 48 V / 114 A |
Description
The evaluation circuit EVAL-LTC7878-BZ features the LTC®7878: a 70V parallelable buck-boost controller with inductor DCR current sensing. The LTC7878 is a four-switch buck-boost switching regulator designed to operate above, below, or equal to the output voltage safely and easily. The constant-frequency, peak-current mode architecture allows phase-lockable switching frequency up to 600kHz. A programmable input or output current loop regulates the average input or output current loop, making it suitable for battery charging applications. Additionally, with a wide 5V to 70V input and output range and seamless, low-noise transition between operating regions, the LTC7878 is ideal for industrial and telecom systems.The EVAL-LTC7878-BZ operates from a 36V to 65V input voltage range and generates an output of 48V and at least a 5.5kW output power. The board features five LTC7878’s in parallel to achieve very high power. The parallel operation is set to a switching frequency of 150kHz, which results in an efficient circuit. The adjacent outputs are phase shifted by 72° offset to interleave the switching while still providing great current sharing.The LTC7878 has a precision voltage reference that can generate an output voltage with a 1% tolerance over the full operating conditions. The converter achieves over 98% efficiency with a 5.5kW output power at full operating VIN.
Features
Single Inductor Architecture Allows VIN Above, Below or Equal to the Regulated VOUTSynchronous Rectification: Up to 98% EfficiencyWide VIN Voltage Range: 5V to 70V±1% Output Voltage Accuracy: 1V ≤ VOUT ≤ 70VDCR or RSENSE Current SensingPeak Current Mode Control in Buck/Boost/Buck-Boost ModeProgrammable Input or Output Current Regulation7V NMOS Gate DriversPhase-Lockable Frequency (100kHz to 600kHz)Multiphase/Multi-ICs Parallel OperationSelectable Continuous or Pulse-Skipping Mode Operation and Inductor Peak Current LimitsSmall 32-Lead 5mm × 5mm QFN Package48-Lead 7mm x 7mm x 0.75mm LFCSP Package
Typical applications
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) | Wire Type | Pins (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 7443641000 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCF SMT High Current Inductor | 10 | 34.95 | 32.6 | 37 | 2.64 | 13 | Flat | 2 | – | 18.5 | – | – | 35 | – | ||
 | 62000821121 | SPEC | – | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Dual Pin Header | – | – | – | – | – | – | – | 8 | Dual | – | Pin Header | Straight | 2 | Bag |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 7443641000 | SPEC | |
| 62000821121 | SPEC | – |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC max. (mΩ) | fres (MHz) | Wire Type | Pins (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples |
|---|
