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LT8490 High Efficiency MPPT Battery Charger Controller Demo Manual (DC2069A)

Demo manual for the DC2069A featuring the LT8490 buck-boost MPPT battery charger controller for solar or DC inputs, delivering up to 16.6A for 12V lead acid batteries.

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Overview

The DC2069A is a demonstration circuit for the LT8490, a high-performance buck-boost converter designed for battery charging with Maximum Power Point Tracking (MPPT). It supports an input voltage range of 17V to 54V and is configured to charge 12V sealed lead-acid (SLA) batteries with currents up to 16.6A. The circuit can operate from solar panels with 36 to 72 cells (up to 200W) or standard DC voltage sources. Key features include an LTC4359 ideal diode controller for back-feed protection, automatic true power point tracking even in partial shade, temperature-compensated charging via an external NTC sensor, and status LEDs for charge stage and fault reporting.

Use Cases

  • Solar-powered battery charging systems
  • Portable power stations
  • Industrial battery management
  • Lead-acid and Lithium-Ion charging applications
  • Remote voltage sensing and temperature-compensated charging

Topics

LT8490
MPPT
Battery Charger Controller
Buck-Boost Converter
Solar Charger
Lead Acid Battery
Lithium-Ion
DC2069A
Analog Devices
LTC4359

Referenced Parts

CMMR1U-02TR

Central Semiconductor

ULTRA FAST RECTIFIER SINGLE, SOD-123F

FDMS86101

Fairchild

MOSFET, N-CHANNEL, 100V POWER 56

SOD523

Diodes

57 1 D16 DIODE, ZENER 12V 150MW SOD523 DIODES INC., DDZ9699T-7

PG-TDSON-8

Infineon

23 1 M2 MOSFET, N-CHANNEL, 60V PG-TDSON-8 INFINEON, BSC016N06NS

PG-TDSON-8

Infineon

22 1 M1 MOSFET, N-CHANNEL, 60V PG-TDSON-8 INFINEON, BSC028N06NS

PG-TDSON-8

Infineon

24 2 M3, M4 MOSFET, N-CHANNEL, 25V PG-TDSON-8 INFINEON, BSC010NE2LSI

BAV99-7-F

Diodes Inc.

DIODE, BAV99 SOT23

BSS84-7-F

Diodes Inc.

P-CH MOSFET, 50V, SOT23

DDZ9699T-7

Diodes Inc.

DIODE, ZENER 12V 150MW SOD523

MMBT3904-7-F

Diodes Inc.

NPN TRANSISTOR, SOT23

SMAJ24A-13-F

Diodes Inc.

DIODE, TVS UNI-DIR 24V 400W SMA

SMAT70A-13-F

Diodes Inc.

DIODE, TVS UNI-DIR 70V 400W SMA

LT8490EUKJ#PBF

Linear Technology

IC., BATTERY CHARGE CONTROLLER, 64-QFN

434 123 050 816

Würth

SWITCH, TACTILE SPST-NO 0.05A 12V

SOT23

Diodes

58 3 D19, D20, D21 DIODE, BAV99 SOT23 DIODES INC., BAV99-7-F

SOT23

Diodes

71 3 Q4, Q13, Q14 NPN TRANSISTOR, SOT23 DIODES INC., MMBT3904-7-F

SOT23

Diodes

72 1 Q6 P-CH MOSFET, 50V, SOT23 DIODES, BSS84-7-F

54V

Maxim

72 cells (54V maximum open circuit voltage) can be