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Analog Devices Inc. LT8490EUKJ#TRPBF
- Part No.:
- LT8490EUKJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LT8490EUKJ#TRPBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,320
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Product details
Overview
LT8490EUKJ#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, high-current buck-boost battery charge controller with integrated maximum power point tracking (MPPT) for solar-powered systems. It delivers constant-current constant-voltage (CCCV) charging across 1.3V–80V battery ranges and 6V–80V input voltages, supports sealed lead-acid, flooded, gel, and lithium-ion chemistries, and operates in buck, boost, or buck-boost modes using a single inductor. Its on-chip MPPT logic enables autonomous solar panel optimization without firmware.
For engineers reviewing the LT8490EUKJ#TRPBF datasheet, LT8490EUKJ#TRPBF pinout, LT8490EUKJ#TRPBF application, or LT8490EUKJ#TRPBF equivalent, key selection considerations include its 64-pin QFN package, four independent feedback loops (input/output voltage/current), automatic temperature compensation via thermistor interface, 100kHz–400kHz synchronizable switching frequency, and hardware-configurable multi-stage CCCV charging algorithm with C/10 termination detection.
Technical Context
The LT8490EUKJ#TRPBF implements a dual-switch buck-boost topology with two independent gate drivers (TG1/BG1 and TG2/BG2) and dedicated current-sense inputs for both input (CSPIN/CSNIN) and output (CSPOUT/CSNOUT) paths. Its control architecture integrates four analog error amplifiers (EA1–EA4) that simultaneously regulate input voltage, input current, output voltage, and output current - with the lowest VC pin command determining final inductor current.
MPPT operation uses perturb-and-observe on the solar panel's VINR and IIR inputs, while battery temperature sensing occurs via the TEMPSENSE pin connected to an NTC thermistor divider. Charging progression through trickle (Stage 0), bulk (Stage 1), absorption/float (Stage 2), and optional reduced-voltage maintenance (Stage 3) is fully hardware-defined using CHARGECFG1/CHARGECFG2 resistor dividers and internal A/D thresholds referenced to AVDD.
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 battery banks. |
| Switching Frequency | 100kHz to 400kHz - adjustable via RT resistor or external SYNC signal; enables optimized magnetics and EMI filtering. |
| Feedback Loops | Four independent loops (FBIN, FBOUT, IMON_IN, IMON_OUT) - enables simultaneous regulation of input power, output power, and battery safety limits. |
| MPPT Method | Perturb-and-observe with full-panel scan capability - autonomously tracks global MPP under partial shading without host intervention. |
| Temperature Compensation | Hardware-based via TEMPSENSE pin and NTC network - adjusts float voltage per battery chemistry's thermal coefficient without software. |
| Package | 64-lead 7mm × 11mm × 0.75mm QFN - exposes thermal pad (Pin 65) for PCB heat sinking; supports high-power dissipation in compact layouts. |
Pinout & Package
LT8490EUKJ#TRPBF is housed in a 64-lead plastic QFN package (7mm × 11mm × 0.75mm) with exposed thermal pad (Pin 65 = GND). The package requires soldering the exposed pad to the PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBIN (15) | Input voltage feedback input | Connects to resistor divider from solar panel; sets input voltage regulation threshold for MPPT. |
| FBOUT (16) | Output voltage feedback input | Connects to resistor divider from battery; defines Stage 2/3 float voltage with temperature compensation via FBOW. |
| IMON_IN (10) | Input current monitor output | Current-source output proportional to solar input current; used for MPPT and input current limiting. |
| IMON_OUT (17) | Output current monitor output | Current-source output proportional to battery charge current; enables C/10 detection and stage transition. |
| TEMPSENSE (3) | Battery temperature sense input | Analog input for NTC thermistor divider; enables automatic voltage derating and disconnect outside safe temp range. |
| STATUS (51) | Charging status indicator | Dual-function: LED drive output + UART (2400 baud) reporting real-time stage, fault, and battery state. |
| FAULT (2) | Fault condition indicator | Open-drain active-high output signaling overvoltage, overtemperature, or invalid configuration events. |
| TG1/BG1 (32/23), TG2/BG2 (28/25) | Top/bottom gate drivers | Drive external N-channel MOSFETs in synchronous buck-boost configuration; GATEVCC supplied internally from INTVCC. |
| SW1/SW2 (31/29) | Switch node terminals | Connect to source terminals of bottom FETs and drain terminals of top FETs; rated to 81V absolute max. |
| CHARGECFG1 (61), CHARGECFG2 (63) | Hardware configuration inputs | ADC inputs setting float voltage, temperature compensation slope, stage 3 enable, and time-limit thresholds via resistor dividers. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Enables VIN above, below, or equal to VBAT - eliminates need for separate buck/boost converters in hybrid energy systems. |
| Four integrated feedback loops | Simultaneous regulation of input voltage, input current, output voltage, and output current - ensures optimal power extraction and battery protection. |
| Automatic MPPT with full-panel scan | Identifies global maximum power point under partial shading by sweeping panel voltage; no microcontroller required. |
| Hardware-configurable CCCV stages | Three-stage charging (trickle/bulk/float + optional Stage 3) defined entirely by external resistors - zero firmware development needed. |
| Integrated 10-bit ADC and UART | Monitors 10 analog inputs (VINR, IIR, FBOR, IOR, TEMPSENSE, CHARGECFG1/2, CLKDET, FBIR) and reports status via STATUS pin UART. |
Applications
| Solar-Powered Remote Telemetry | Off-Grid Telecom Power System |
|---|---|
Use Scenario: Battery-backed cellular/IoT gateway operating in unattended desert or mountain locations powered solely by photovoltaic panel. IC Role / Device Role / Timing Role: Primary charge controller managing energy flow from panel to 24V SLA battery bank while enforcing temperature-compensated absorption voltage and C/10 termination. Use Value: Autonomous MPPT maximizes daily energy harvest under variable irradiance; hardware-based charging stages eliminate need for field-upgradable firmware during battery replacement. | Use Scenario: 48V telecom base station backup system using lithium-iron-phosphate (LiFePO₄) batteries charged from rooftop solar array. IC Role / Device Role / Timing Role: High-efficiency buck-boost charger regulating 36–72V panel input to 28.8V nominal LiFePO₄ stack with precise 0.5% voltage accuracy and ±2% current limit. Use Value: Dual current-sense paths (IMON_IN/IMON_OUT) enable accurate input power capping and output charge current limiting; STATUS UART provides remote diagnostics without additional sensors. |
| Military Portable Power Unit | Industrial UPS with Solar Assist |
Use Scenario: Ruggedized portable power supply for forward-deployed equipment requiring rapid recharge from vehicle alternator or foldable solar blanket. IC Role / Device Role / Timing Role: Multi-source charger supporting seamless transition between 12–28V DC input (vehicle) and 18–40V solar input while maintaining 24V battery float at –40°C to +125°C junction temperature. Use Value: Wide VIN/VBAT range and automotive-grade temperature rating (–40°C to 125°C) ensure operational continuity across extreme environments; EXTVCC switchover enables efficient auxiliary supply use. | Use Scenario: Factory-floor uninterruptible power supply integrating solar generation to reduce grid draw during daylight hours while maintaining critical load uptime. IC Role / Device Role / Timing Role: Secondary charge controller augmenting main AC/DC charger by injecting solar-derived current into 48V lead-acid battery bank during peak sun hours. Use Value: Input current regulation (IMON_IN) prevents solar overload of main charger; FAULT pin integration enables centralized alarm handling in PLC-controlled power management system. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4015IUHF#PBF | Quad-input (solar, USB, wall adapter, battery) buck-boost charger; fixed 300kHz switching; no MPPT engine - requires external MCU for solar tracking. | Targeted at portable electronics with multiple input sources; lacks autonomous solar optimization and wide 80V input capability. | Select LTC4015 for space-constrained consumer devices needing multi-source flexibility but not standalone solar harvesting. |
| MP2731GQ-Z | Integrated 4-switch buck-boost charger with I²C interface; supports Li-ion only; max 28V input; no hardware-configurable stages or analog MPPT. | Designed for smartphone/tablet power path management; relies on host processor for charging profile and MPPT execution. | Choose MP2731 for cost-sensitive, Li-ion-only applications where I²C control and small footprint outweigh need for solar autonomy or wide-VIN operation. |
Compared with LTC4015IUHF#PBF and MP2731GQ-Z, LT8490EUKJ#TRPBF uniquely combines 80V input/output capability, hardware-defined MPPT, and four independent analog feedback loops - enabling robust, firmware-free solar-battery systems for industrial and military deployments where reliability and environmental resilience are critical.
Availability
LT8490EUKJ#TRPBF is available at Aetrix Electronics and suitable for solar-powered battery chargers, off-grid telecom power systems, and ruggedized military portable power units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8490EUKJ#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to strengthen its power management portfolio.
The LT8490 product line was developed specifically for autonomous, high-voltage solar battery charging in harsh environments - emphasizing hardware-defined control, wide input/output ranges, and integrated safety monitoring without software dependencies.
FAQ
What is the operating temperature range for the LT8490EUKJ#TRPBF?
The LT8490EUKJ#TRPBF is specified for operation from –40°C to +125°C junction temperature. This grade (E suffix) is guaranteed over 0°C to 125°C and assured over the full –40°C to 125°C range via design correlation and statistical process controls - making it suitable for under-hood automotive auxiliary systems and outdoor solar installations.
Does the LT8490EUKJ#TRPBF require external microcontroller firmware to perform MPPT?
No, the LT8490EUKJ#TRPBF implements fully autonomous MPPT using on-chip perturb-and-observe logic and full-panel voltage scanning. It reads VINR and IIR analog inputs via internal ADCs and adjusts the FBIN regulation point in real time - eliminating any requirement for external firmware, software development, or host processor intervention during solar charging.
How does the LT8490EUKJ#TRPBF support temperature-compensated charging?
The LT8490EUKJ#TRPBF supports temperature compensation via the TEMPSENSE pin, which connects to an NTC thermistor divider thermally coupled to the battery. The internal ADC measures this voltage and dynamically adjusts the FBOW PWM duty cycle to modify the FBOUT reference - thereby scaling the float voltage per battery chemistry's thermal coefficient without external components or calibration.
Can the LT8490EUKJ#TRPBF charge lithium-ion and lead-acid batteries with the same circuit?
Yes, the LT8490EUKJ#TRPBF supports both lithium-ion and lead-acid chemistries through hardware configuration. Stage 2 (constant-voltage) and Stage 3 (reduced-voltage) thresholds are set via CHARGECFG1 resistor dividers, while temperature compensation slope and valid temperature range are configured via CHARGECFG2 - enabling one PCB design to serve multiple battery types with only passive component changes.
What communication interface does the LT8490EUKJ#TRPBF provide for status monitoring?
The LT8490EUKJ#TRPBF provides asynchronous UART communication over the STATUS pin at 2400 baud (8N1), transmitting two bytes every 3.5 seconds with real-time data on charging stage, fault conditions, battery voltage, and current. No external transceiver or level-shifting is required - the pin drives LEDs directly and supports simple microcontroller GPIO capture.
LT8490EUKJ#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)
LT8490EUKJ#TRPBF FAQ
1.How can I place an order for LT8490EUKJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8490EUKJ#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 LT8490EUKJ#TRPBF reliable?
The price and inventory of LT8490EUKJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8490EUKJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8490EUKJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8490EUKJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8490EUKJ#TRPBF?
LT8490EUKJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8490EUKJ#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 LT8490EUKJ#TRPBF?
For technical support, including LT8490EUKJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8490EUKJ#TRPBF requirements.
6.How does Aetrix verify that LT8490EUKJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8490EUKJ#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 LT8490EUKJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8490EUKJ#TRPBF?
All LT8490EUKJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8490EUKJ#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 LT8490EUKJ#TRPBF part is unused and in its original packaging.
Return procedure for LT8490EUKJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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