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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 | Type | Mount | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCF SMT High Current Inductor, 10 µH, 34.95 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance10 µH | Performance Rated Current34.95 A | Saturation Current @ 10%32.6 A | Saturation Current @ 30%37 A | DC Resistance2.64 mΩ | Self Resonant Frequency13 MHz | Wire TypeFlat | Pins2 | – | MountSMT | Length27 mm | Height18.5 mm | Rated Current35 A | – | Operating Temperature -40 °C up to +125 °C | ||||
 | WR-PHD Pin Header, –, – | Simulation– | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | Pins8 | TypeStraight | MountTHT | Length8 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C |