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reference designLTC7878 | Demoboard EVAL-LTC7878-BZ

Analog Devices LTC7878 | Demoboard EVAL-LTC7878-BZ

70V Parallel Five-Phase 4-Switch Buck-Boost Controller

Overview

TopologyBuck-Boost Converter
Input voltage40-65 V
Output 148 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 VOUT
  • Synchronous Rectification: Up to 98% Efficiency
  • Wide VIN Voltage Range: 5V to 70V
  • ±1% Output Voltage Accuracy: 1V ≤ VOUT ≤ 70V
  • DCR or RSENSE Current Sensing
  • Peak Current Mode Control in Buck/Boost/Buck-Boost Mode
  • Programmable Input or Output Current Regulation
  • 7V NMOS Gate Drivers
  • Phase-Lockable Frequency (100kHz to 600kHz)
  • Multiphase/Multi-ICs Parallel Operation
  • Selectable Continuous or Pulse-Skipping Mode Operation and Inductor Peak Current Limits
  • Small 32-Lead 5mm × 5mm QFN Package
  • 48-Lead 7mm x 7mm x 0.75mm LFCSP Package

Typical applications

  • Industrial Systems
  • Battery Backup Units (BBU)
  • Telecom Systems

More information

Products

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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
SamplesAvailability & Sample
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7443641000
SPECWE-HCF SMT High Current Inductor, 10 µH, 34.95 A
Simu­lation
Availability
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Downloads9 files

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
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Operating Temperature -40 °C up to +125 °C
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62000821121
SPECWR-PHD Pin Header, –, –
Simu­lation–
Availability
–
Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header
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–
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–
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Pins8 
TypeStraight 
MountTHT 
Length8 mm
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Rated Current2 A
Working Voltage200 V (AC)
Operating Temperature -40 °C up to +105 °C
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