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Analog Devices Inc. LT8490IUKJ#TRPBF
- Part No.:
- LT8490IUKJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LT8490IUKJ#TRPBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,360
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Product details
Overview
LT8490IUKJ#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, high-current buck-boost battery charge controller with integrated MPPT for solar-powered systems. It delivers constant-current constant-voltage (CCCV) charging across 1.3V–80V battery ranges and 6V–80V input, supports sealed lead-acid, flooded, gel, and lithium-ion chemistries, and operates in buck, boost, or buck-boost modes using a single inductor.
For engineers reviewing the LT8490IUKJ#TRPBF datasheet, LT8490IUKJ#TRPBF pinout, LT8490IUKJ#TRPBF application, or LT8490IUKJ#TRPBF equivalent, key selection considerations include its 64-pin QFN package, automatic temperature compensation via thermistor, four independent feedback loops (input/output voltage/current), 100kHz–400kHz synchronizable switching frequency, and hardware-configurable multi-stage CCCV algorithm without firmware.
Technical Context
The LT8490IUKJ#TRPBF implements a perturb-and-observe MPPT algorithm that dynamically adjusts panel operating voltage to maximize power extraction under varying irradiance and temperature. Its dual-switch buck-boost topology enables seamless transition between VIN > VBAT, VIN < VBAT, and VIN ≈ VBAT conditions without mode switching artifacts.
Four integrated error amplifiers (EA1–EA4) independently regulate input voltage, input current, output voltage, and output current-each feeding into a shared VC node where the lowest command dominates. Temperature compensation is applied via analog PWM outputs (FBIW/FBOW) driving RC networks on FBIN/FBOUT pins, while CHARGECFG1/CHARGECFG2 pins configure stage voltages, time limits, and thermal thresholds using AVDD-referenced ADC inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6V to 80V - supports wide-input solar panels and industrial DC supplies without external pre-regulation. |
| VBAT Range | 1.3V to 80V - accommodates single-cell Li-ion up to 48V lead-acid stacks and custom battery configurations. |
| Switching Frequency | 100kHz to 400kHz - adjustable via RT resistor or external SYNC signal; enables optimized magnetics and EMI filtering. |
| MPPT Method | Perturb-and-observe - fully autonomous, no microcontroller required; tracks maximum power point in real time using VINR and IIR inputs. |
| Charging Algorithm | Hardware-configured 4-stage CCCV - includes trickle (Stage 0), bulk (Stage 1), absorption/float (Stage 2), and reduced-voltage maintenance (Stage 3). |
| Temperature Compensation | NTC-based via TEMPSENSE pin - adjusts charge voltage per battery chemistry's β coefficient; also detects open-battery condition. |
| Package | 64-lead 7mm × 11mm × 0.75mm QFN - exposes thermal pad for PCB heat sinking; rated for –40°C to 125°C junction temperature. |
Pinout & Package
LT8490IUKJ#TRPBF is housed in a 64-lead plastic QFN package (7mm × 11mm × 0.75mm) with exposed thermal pad (Pin 65 = GND). The package supports high-power dissipation in solar charger applications and requires soldering of the exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBIN (15) | Input voltage feedback input | Connects to resistive divider from solar panel; used by MPPT loop to regulate input voltage at maximum power point. |
| FBOUT (16) | Output voltage feedback input | Connects to battery voltage divider; sets Stage 2/3 float voltage; compensated via FBOW PWM output. |
| IMON_IN (10) | Input current monitor output | Sinks current proportional to solar input current; used for MPPT current limiting and start-up validation. |
| IMON_OUT (17) | Output current monitor output | Sinks current proportional to battery charge current; enables C-rate-based stage transitions (e.g., C/10 detection). |
| TEMPSENSE (3) | Battery temperature sense input | ADC input for NTC thermistor network; enables voltage derating and thermal cutoff per JEITA profiles. |
| STATUS (51) | Charging status indicator | Open-drain UART output (2400 baud) + LED drive; reports stage, fault, and battery connection status every 3.5s. |
| FAULT (2) | Fault indicator output | Active-high digital flag indicating overvoltage, overtemperature, reverse current, or invalid configuration. |
| CHARGECFG1 (61) | Stage 3 & temp compensation config | AVDD-referenced ADC input setting float voltage, temperature coefficient, and Stage 3 enable threshold. |
| CHARGECFG2 (63) | Time limit & thermal range config | AVDD-referenced ADC input configuring charge timeout, valid temperature window, and timer enable. |
| IOR (64) | Output current readback input | ADC input tied to IMON_OUT; used internally for C/10 detection and stage progression logic. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate buck and boost converters; simplifies layout and reduces BOM count in solar battery systems. |
| Hardware-based MPPT | Autonomous perturb-and-observe algorithm implemented in analog/digital control logic-no MCU or firmware required. |
| Four independent regulation loops | Simultaneous input voltage, input current, output voltage, and output current control ensures robust operation under partial shading or load transients. |
| Thermistor-based temperature compensation | Configurable via external NTC network on TEMPSENSE pin; enforces JEITA-compliant charge profiles and open-battery detection. |
| Multi-stage CCCV with configurable timers | Stages 0–3 defined by hardware resistors on CHARGECFG1/CHARGECFG2; time limits prevent overcharge in float/maintenance phases. |
Applications
| Solar-Powered Off-Grid Battery Systems | Industrial Backup Power for Telecom Sites |
|---|---|
Use Scenario: Remote telecom shelter powered by 48V solar array charging 48V lead-acid backup bank with daily load cycling. IC Role / Device Role / Timing Role: Primary charge controller managing MPPT, CCCV stages, temperature derating, and fault-safe disconnect. Use Value: Maintains >92% energy harvest efficiency across irradiance variations; eliminates need for external microcontroller or software updates. | Use Scenario: Critical infrastructure UPS with dual 24V LiFePO₄ strings requiring precise voltage/current limits and thermal monitoring. IC Role / Device Role / Timing Role: High-accuracy battery charger enforcing JEITA voltage windows and C/10 termination via hardware-configured ADC thresholds. Use Value: Extends cycle life by 35% vs fixed-voltage chargers through dynamic temperature compensation and staged voltage reduction. |
| Military Portable Power Units | Marine Hybrid Energy Storage |
Use Scenario: Man-portable battery system charging SLA/Li-ion packs from vehicle alternator or foldable solar blanket in field deployments. IC Role / Device Role / Timing Role: Dual-input (solar/DC) buck-boost charger with ruggedized thermal management and STATUS UART diagnostics. Use Value: Enables rapid field reconfiguration between chemistries via resistor programming-no firmware flash required. | Use Scenario: Yacht auxiliary power system integrating 36V solar array, 24V AGM house bank, and 12V starter battery with shore power fallback. IC Role / Device Role / Timing Role: High-voltage solar charge controller with programmable stage voltages and automatic low-power mode during night/dock periods. Use Value: Reduces parasitic drain to <1µA in shutdown; extends battery autonomy by 18% in intermittent-use marine environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4020IUFD#PBF | Single-output buck-boost charger; no MPPT; supports only 2.5V–55V VOUT; lacks CHARGECFG pins and STATUS UART. | Best for DC-fed (not solar) applications requiring simpler 3-stage CCCV without autonomous power tracking. | Select when solar MPPT is unnecessary and cost-sensitive designs prioritize smaller 28-pin QFN footprint. |
| MAX20095ATPA/VY+ | Automotive-grade 60V buck-boost charger; integrates MOSFET drivers but no MPPT engine; uses SPI interface instead of hardware config. | Suitable for automotive 12V/24V battery systems with CAN diagnostics; not rated for 80V solar input or industrial temperature range. | Choose for AEC-Q100 qualified designs needing embedded diagnostics and functional safety features-not for off-grid solar. |
Compared with LTC4020IUFD#PBF and MAX20095ATPA/VY+, the LT8490IUKJ#TRPBF uniquely combines 80V solar input capability, autonomous MPPT, hardware-programmable multi-stage charging, and industrial temperature rating in a single IC-making it irreplaceable for high-reliability off-grid solar battery systems.
Availability
LT8490IUKJ#TRPBF is available at Aetrix Electronics and suitable for solar-powered battery chargers, industrial backup power systems, and military portable power units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8490IUKJ#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains full support for legacy Linear power management ICs including the LT8490 family.
The LT8490 product line was designed specifically for high-voltage solar battery charging applications requiring autonomous MPPT, multi-chemistry support, and hardware-configurable safety-critical charging algorithms-targeting off-grid, telecom, and defense markets.
FAQ
What battery chemistries does the LT8490IUKJ#TRPBF support?
The LT8490IUKJ#TRPBF supports sealed lead-acid (SLA), flooded, gel, and lithium-ion batteries through its hardware-configurable CCCV algorithm. Configuration is achieved via resistor dividers on CHARGECFG1 and CHARGECFG2 pins, enabling precise stage voltages, temperature coefficients, and time limits tailored to each chemistry's requirements without firmware changes. The LT8490IUKJ#TRPBF does not require software development for chemistry adaptation.
How does the LT8490IUKJ#TRPBF implement Maximum Power Point Tracking?
The LT8490IUKJ#TRPBF uses a perturb-and-observe MPPT algorithm executed entirely in hardware. It samples input voltage (VINR) and input current (IIR) via internal ADCs, dynamically adjusts the FBIN reference to shift operating point, and locks onto the voltage yielding highest instantaneous power. No external processor or software is needed-the LT8490IUKJ#TRPBF performs full MPPT autonomously using only its dedicated pins and internal logic.
Can the LT8490IUKJ#TRPBF operate without a microcontroller?
Yes-the LT8490IUKJ#TRPBF is designed for microcontroller-free operation. All functions-including MPPT, four-loop regulation, multi-stage CCCV charging, temperature compensation, and fault reporting-are implemented in hardware. Configuration is done via external resistors on CHARGECFG1/CHARGECFG2, thermistor networks on TEMPSENSE, and feedback dividers on FBIN/FBOUT. The STATUS pin provides UART diagnostics without host intervention.
What is the role of the STATUS pin on the LT8490IUKJ#TRPBF?
The STATUS pin on the LT8490IUKJ#TRPBF serves dual functions: it drives an LED for visual stage/fault indication and transmits two UART bytes (2400 baud, 8N1) every 3.5 seconds containing real-time charging status, stage number, and fault flags. This enables simple host monitoring without dedicated communication peripherals. The LT8490IUKJ#TRPBF STATUS pin requires no external pull-up and operates directly from internal logic.
Does the LT8490IUKJ#TRPBF support temperature-compensated charging?
Yes-the LT8490IUKJ#TRPBF supports precise temperature-compensated charging via the TEMPSENSE pin, which reads an NTC thermistor network thermally coupled to the battery. The internal ADC converts this to a voltage used to adjust FBOW and FBIW PWM outputs, dynamically modifying charge voltage per JEITA profiles. It also detects open-battery conditions and disables charging outside user-defined thermal limits configured via CHARGECFG2.
LT8490IUKJ#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 80V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-QFN (7x11)
LT8490IUKJ#TRPBF FAQ
1.How can I place an order for LT8490IUKJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8490IUKJ#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT8490IUKJ#TRPBF reliable?
The price and inventory of LT8490IUKJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8490IUKJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8490IUKJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8490IUKJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8490IUKJ#TRPBF?
LT8490IUKJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8490IUKJ#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT8490IUKJ#TRPBF?
For technical support, including LT8490IUKJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8490IUKJ#TRPBF requirements.
6.How does Aetrix verify that LT8490IUKJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8490IUKJ#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT8490IUKJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8490IUKJ#TRPBF?
All LT8490IUKJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8490IUKJ#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT8490IUKJ#TRPBF part is unused and in its original packaging.
Return procedure for LT8490IUKJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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