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Analog Devices Inc. LT8491EUKJ#TRPBF
- Part No.:
- LT8491EUKJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LT8491EUKJ#TRPBF.pdf
- Description:
- IC BATT CHG LEAD ACID 1CEL 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,634
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Product details
Overview
LT8491EUKJ#TRPBF from Analog Devices is a high-voltage buck-boost battery charge controller with integrated MPPT, I²C telemetry, and four feedback loops. It supports 6V–80V input and 1.3V–80V battery output, operates from solar panels or DC supplies, and implements CCCV charging for SLA, gel, flooded, and Li-ion batteries. Its 64-lead QFN package enables compact solar charger designs in industrial and portable military equipment.
For engineers reviewing the LT8491EUKJ#TRPBF datasheet, LT8491EUKJ#TRPBF pinout, LT8491EUKJ#TRPBF application, or LT8491EUKJ#TRPBF equivalent, key selection considerations include its automatic MPPT algorithm, I²C-configurable charging stages, internal EEPROM storage, temperature-compensated voltage regulation, and dual current-sense architecture for precise input/output current control.
Technical Context
The LT8491EUKJ#TRPBF integrates two synchronous buck-boost power stages with shared inductor topology, enabling VIN above, below, or equal to VBAT. Its perturb-and-observe MPPT engine continuously adjusts panel operating point using IMON_IN and IMON_OUT telemetry, while internal A/D converters (10-bit resolution) digitize TEMPSENSE, FBIN, FBOUT, and current-sense signals.
Four independent closed-loop controls govern battery charging: constant-current (IMON_OUT), constant-voltage (FBOUT), input current limit (IMON_IN), and solar panel voltage regulation (FBIW). The device uses an internal 6.35V INTVCC regulator-sourced from EXTVCC or VIN-and supports fixed-frequency switching (100–400kHz) with external RT resistor or SYNC clock input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6V to 80V - supports wide-input solar arrays and industrial DC rails without pre-regulation. |
| VBAT Range | 1.3V to 80V - accommodates single-cell Li-ion up to 24S lead-acid stacks. |
| Switching Frequency | 100kHz to 400kHz - adjustable via RT resistor or external SYNC signal for EMI optimization. |
| MPPT Algorithm | Automatic perturb-and-observe - dynamically tracks maximum power point under partial shading or varying irradiance. |
| I²C Interface | Standard-mode (100kHz) with 7-bit address - enables real-time telemetry readout and configuration of all charging parameters. |
| EEPROM Storage | Internal nonvolatile memory - retains user-defined configurations (e.g., stage voltages, timeouts, compensation) across power cycles. |
| Temperature Compensation | Thermistor-based via TEMPSENSE pin - adjusts charge voltage per battery chemistry and thermal profile per JEITA standards. |
| Package | 64-lead 7mm × 11mm × 0.75mm QFN - exposes thermal pad (Pin 65) for efficient heat dissipation in high-power solar chargers. |
Pinout & Package
LT8491EUKJ#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-density PCB layouts and requires soldering the exposed pad to a thermal plane for reliable operation at full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBOUT (16) | Output voltage feedback input | Connects to resistor divider from battery terminal; sets constant-voltage regulation point during Stage 2/3. |
| IMON_OUT (17) | Average output current monitor | Current-source output proportional to battery charge current; used for CCCV transition and C/10 termination detection. |
| TEMPSENSE (3) | Battery temperature sensing input | Analog input for thermistor network; enables automatic voltage derating outside safe thermal range. |
| SDA (61), SCL (63) | I²C bidirectional data/clock | Interface for reading telemetry registers (TELE_VBAT, TELE_IOUT, etc.) and writing configuration (CFG_VS3_25C, CFG_TMR_S1). |
| STATUS (51) | Charger status indicator | Open-drain output driving LED; asserts low during active charging, high-Z when done or faulted. |
| GND (1, 62, 59, 55) | Ground reference | Multiple dedicated ground pins minimize noise coupling; exposed pad (Pin 65) must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate boost/buck converters; supports seamless transition between step-up and step-down modes without mode switching artifacts. |
| Integrated MPPT engine | Performs full-panel voltage sweeps and real-time perturbation without external MCU; reduces system BOM and firmware complexity. |
| I²C telemetry and configuration | Provides live readout of 12+ telemetry values (e.g., TELE_PIN, TELE_EFF, STAT_CHARGER) and stores >30 configuration registers in EEPROM. |
| Four independent feedback loops | Simultaneously regulates input current, output current, battery voltage, and solar panel voltage - critical for stable operation under dynamic irradiance. |
| Automatic temperature compensation | Uses TEMPSENSE input to adjust FBOUT reference per NTC thermistor curve; prevents overcharge at elevated temperatures. |
| Programmable charge staging | Configures trickle (Stage 0), full CC (Stage 1), CV (Stage 2), and reduced CV (Stage 3) with independent voltage, current, and timeout settings. |
Applications
| Solar-Powered Remote Monitoring Station | Lithium-Ion Battery Backup System |
|---|---|
|
Use Scenario: Off-grid environmental sensor node powered by 36V solar array, charging 24V Li-ion pack for nighttime operation. IC Role / Device Role / Timing Role: Primary charge controller managing MPPT, CCCV profile, and thermal safety; interfaces via I²C to host MCU for state reporting. Use Value: Maintains >92% average conversion efficiency across 20–75°C ambient; eliminates need for external MPPT microcontroller and discrete current sensors. |
Use Scenario: Telecom base station backup unit using 48V solar input to charge 4S Li-ion string with precise 4.2V/cell regulation. IC Role / Device Role / Timing Role: Dual-role controller performing solar MPPT and battery-specific CCCV algorithm with JEITA-compliant temperature derating. Use Value: Achieves C/10 termination accuracy within ±2% via IMON_OUT current monitoring; stores custom charge profiles in EEPROM for field-upgradable behavior. |
| Lead-Acid UPS for Industrial Control Cabinet | Military Portable Power Supply |
|
Use Scenario: 48V DC-powered cabinet with flooded lead-acid battery bank requiring maintenance charging and temperature compensation. IC Role / Device Role / Timing Role: Regulates float voltage (2.25V/cell) and absorption voltage (2.4V/cell) with automatic transition based on IMON_OUT decay. Use Value: Compensates voltage setpoint by –3mV/°C per cell using external NTC; prevents sulfation in hot environments and undercharging in cold conditions. |
Use Scenario: Ruggedized manpack radio system with 28V solar input charging 24V SLA battery under variable battlefield lighting conditions. IC Role / Device Role / Timing Role: Robust charge manager handling rapid irradiance changes, reverse-current protection, and STATUS-driven LED status indication. Use Value: Withstands 80V transients on VIN; detects open thermistor fault and disables charging; STATUS pin drives MIL-STD-810G-compliant indicator lamp. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8705EFE#TRPBF | No integrated MPPT engine; requires external MCU for perturb-and-observe logic; lacks I²C telemetry and EEPROM. | Suitable for DC-fed systems only; not recommended for solar applications without added firmware overhead. | Select when cost sensitivity outweighs MPPT autonomy and telemetry needs; verify external control loop stability. |
| BQ24650RGER | Fixed 200kHz switching; no buck-boost topology - limited to VIN > VBAT; no temperature compensation or EEPROM. | Designed for AC-DC adapter input only; cannot regulate solar panel voltage or adapt to battery thermal profile. | Choose only for simple 12V/24V lead-acid charging from regulated DC supply where MPPT and telemetry are unnecessary. |
Compared with LT8491EUKJ#TRPBF, LT8705EFE#TRPBF requires external MPPT implementation and offers no runtime telemetry, while BQ24650RGER lacks buck-boost capability and thermal adaptation - making LT8491EUKJ#TRPBF uniquely suited for autonomous, solar-powered, multi-chemistry battery charging with field-programmable behavior.
Availability
LT8491EUKJ#TRPBF is available at Aetrix Electronics and suitable for solar-powered battery chargers, industrial UPS systems, and portable military power supplies requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 125°C junction temperature.
Supply support for LT8491EUKJ#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and power management markets.
The LT8491 product line was designed specifically for autonomous solar battery charging in harsh environments, integrating MPPT, multi-stage CCCV control, and robust telemetry into a single IC to replace discrete MCU-based solutions.
FAQ
What battery chemistries does the LT8491EUKJ#TRPBF support?
The LT8491EUKJ#TRPBF supports sealed lead-acid (SLA), flooded, gel, and lithium-ion batteries through its programmable CCCV charging algorithm. Its I²C interface allows configuration of stage voltages, current limits, and timeouts for each chemistry; temperature compensation via the TEMPSENSE pin ensures safe operation across thermal extremes. The LT8491EUKJ#TRPBF does not require hardware changes to switch between chemistries - only register updates.
How does the LT8491EUKJ#TRPBF implement Maximum Power Point Tracking?
The LT8491EUKJ#TRPBF uses an on-chip perturb-and-observe MPPT engine that dynamically adjusts the solar panel operating voltage by modulating the FBIW PWM output. It samples IMON_IN and VPANEL via internal A/D converters, calculates instantaneous power, and shifts the duty cycle to maximize output. No external processor or software is needed - the LT8491EUKJ#TRPBF performs full-panel scans and handles partial shading autonomously.
Can the LT8491EUKJ#TRPBF operate without an external microcontroller?
Yes - the LT8491EUKJ#TRPBF is fully autonomous: it executes complete CCCV charging sequences, MPPT, temperature compensation, fault detection, and STATUS signaling without MCU intervention. Its internal EEPROM stores all configuration parameters, and the I²C interface is optional for telemetry or reprogramming. The LT8491EUKJ#TRPBF starts charging immediately upon valid VIN and battery connection, making it ideal for standalone solar chargers.
What is the role of the IMON_IN and IMON_OUT pins on the LT8491EUKJ#TRPBF?
IMON_IN provides a current-source output proportional to input (solar panel) current, used for MPPT power calculation and input current limiting. IMON_OUT provides a current-source output proportional to output (battery) current, enabling precise constant-current regulation, C/10 termination detection, and telemetry of charge rate. Both pins interface directly with external resistors to generate voltage signals readable by the LT8491EUKJ#TRPBF's internal A/D converters.
Does the LT8491EUKJ#TRPBF support synchronization to an external clock?
Yes - the LT8491EUKJ#TRPBF accepts an external clock signal on the SYNC pin (Pin 21) to lock its switching frequency between 100kHz and 400kHz. This feature enables EMI reduction through frequency dithering or alignment with system clocks. When SYNC is unused, the device operates in free-running mode controlled by the RT resistor. The CLKOUT pin (Pin 20) provides a phase-inverted copy of the switching clock for debugging or cascaded synchronization.
LT8491EUKJ#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:
- Lead Acid
- Number of Cells:
- 1
- Current - Charging:
- Constant
- Programmable Features:
- Current, Voltage
- Fault Protection:
- Over Temperature, Over Voltage
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 1.3V ~ 80V
- Voltage - Supply (Max):
- 80V
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-QFN (7x11)
LT8491EUKJ#TRPBF FAQ
1.How can I place an order for LT8491EUKJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8491EUKJ#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 LT8491EUKJ#TRPBF reliable?
The price and inventory of LT8491EUKJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8491EUKJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8491EUKJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8491EUKJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8491EUKJ#TRPBF?
LT8491EUKJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8491EUKJ#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 LT8491EUKJ#TRPBF?
For technical support, including LT8491EUKJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8491EUKJ#TRPBF requirements.
6.How does Aetrix verify that LT8491EUKJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8491EUKJ#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 LT8491EUKJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8491EUKJ#TRPBF?
All LT8491EUKJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8491EUKJ#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 LT8491EUKJ#TRPBF part is unused and in its original packaging.
Return procedure for LT8491EUKJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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