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reference designLT8491 | Demoboard LT8491

Analog Devices LT8491 | Demoboard LT8491

High Voltage Buck-Boost Battery Charge Controller with Maximum Power Point Tracking (MPPT) and I2C

Overview

TopologyBuck-Boost Converter
Input voltage53 V
Output 156.8 V

Description

The LT®8491 is a buck-boost switching regulator battery charger that implements a constant-current constant voltage (CCCV) charging profile used for most battery types, including sealed lead-acid (SLA), flooded, gel and lithium-ion. The device operates from input voltages above, below or equal to the output voltage and can be powered by a solar panel or a DC power supply. On-chip logic provides automatic maximum power point tracking (MPPT) for solar powered applications. The LT8491 can perform automatic temperature compensation by sensing an external thermistor thermally coupled to the battery. The STATUS pin can be used to drive an LED indicator lamp. The device is available in a low profile (0.75mm) 7mm × 11mm 64-lead QFN package.

Features

  • VIN Range: 6V to 80V
  • VBAT Range: 1.3V to 80V
  • Single Inductor Allows VIN Above, Below, or Equal to VBAT
  • Automatic MPPT for Solar Powered Charging
  • Automatic Temperature Compensation
  • I2C Telemetry and Configuration
  • Internal EEPROM for Configuration Storage
  • Operation from Solar Panel or DC Supply
  • Four Integrated Feedback Loops
  • Synchronizable Fixed Frequency: 100kHz to 400kHz
  • 64-Lead (7mm × 11mm × 0.75mm) QFN Package

Typical applications

  • Solar Powered Battery Chargers / Multiple Types of Lead-Acid Battery Charging / Li-Ion Battery Charger / Battery Equipped Industrial or Portable Military Equipment

More information

Products

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Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC max.(mΩ)
fres(MHz)
Wire Type
SamplesAvailability & Sample
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74436411500
SPECWE-HCF SMT High Current Inductor, 15 µH, 44 A

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-HCF SMT High Current Inductor
Inductance15 µH
Performance Rated Current44 A
Saturation Current @ 10%13 A
Saturation Current @ 30%14.3 A
DC Resistance1.44 mΩ
Self Resonant Frequency10.73 MHz
Wire TypeFlat 
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