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Analog Devices Inc. LT8390JFE#PBF
- Part No.:
- LT8390JFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390JFE#PBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST CNT
- Quantity:
- Payment:
- Shipping:
Inventory:3,152
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Product details
Overview
LT8390JFE#PBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V–60V input and 0V–60V output, with ±1.5% output voltage accuracy, 150kHz–650kHz adjustable switching frequency, and AEC-Q100 Grade 1 qualification (–40°C to +150°C junction). It enables seamless region transitions and is used in automotive battery chargers, industrial power supplies, and telecom voltage regulators.
For engineers reviewing the LT8390JFE#PBF datasheet, LT8390JFE#PBF pinout, LT8390JFE#PBF application, or LT8390JFE#PBF equivalent, key selection considerations include its peak-buck/peak-boost current mode control, spread spectrum EMI reduction, integrated bootstrap diodes, high-side PMOS load switch driver, and dual current sense inputs (ISP/ISN) for input/output current regulation.
Technical Context
The LT8390JFE#PBF implements Analog Devices' proprietary peak-buck/peak-boost current mode architecture, using a single inductor and shared ISP/ISN current sense path for both buck and boost regions. It supports three operating modes-buck (VIN/VOUT ≤ 0.75), buck-boost (0.75 < VIN/VOUT < 1.33), and boost (VIN/VOUT ≥ 1.33)-with hysteresis-based boundary transitions to prevent chattering.
Control logic integrates two error amplifiers (EA1 for voltage loop, EA2 for current loop), programmable soft-start via SS pin, fault management (FB overvoltage/short detection), and flexible synchronization/spread spectrum via SYNC/SPRD pin. The device drives four external N-channel MOSFETs (TG1/BG1/TG2/BG2) with matched gate drive timing and shoot-through protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide-input systems including 12V/24V/48V automotive and industrial rails. |
| VOUT Range | 0V to 60V - enables bidirectional voltage regulation, battery charging, and supercapacitor balancing. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation across temperature and line/load variations. |
| Switching Frequency | 150kHz–650kHz (adjustable via RT resistor or external sync clock) - balances efficiency, size, and EMI performance. |
| Current Sense Accuracy | ±3% for input/output current monitoring (via ISP/ISN) - enables precise CC/CV battery charging and power limiting. |
| Operating Junction Temp | –40°C to +150°C - qualified per AEC-Q100 Grade 1 for under-hood automotive and high-temp industrial use. |
| Spread Spectrum | ±15% triangle modulation (enabled by tying SYNC/SPRD to INTVCC) - reduces peak EMI without external components. |
Pinout & Package
LT8390JFE#PBF is housed in a 28-lead plastic TSSOP package with exposed pad (pin 29 = GND), θJA = 30°C/W, θJC = 5°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1, BG2 | Buck/Boost bottom gate drivers | Drive N-MOSFET sources to GND; rail-to-rail swing (0V to INTVCC) enables efficient low-side switching. |
| TG1, TG2 | Buck/Boost top gate drivers | Drive N-MOSFET gates from SWx to BSTx; integrated bootstrap diodes reduce external component count. |
| ISP / ISN | Dual-current-sense differential inputs | Support input or output current regulation with Kelvin sensing; full-scale threshold programmable via CTRL pin (5mV–100mV). |
| LOADEN / LOADTG | High-side PMOS load switch control | Enables/disables external PMOS FET; LOADTG provides buffered inverted signal referenced to VOUT (not GND). |
| SYNC/SPRD | Frequency control input | Ground = fixed oscillator; INTVCC = ±15% spread spectrum; external clock = synchronizable operation. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor topology | Eliminates need for separate buck and boost converters; reduces BOM cost and board area while enabling VIN above/below/equal to VOUT. |
| Seamless region transition | No output disturbance during mode shifts (e.g., buck → buck-boost → boost); critical for uninterrupted power in automotive start-stop and backup systems. |
| Integrated bootstrap diodes | Removes two external Schottky diodes per side; simplifies layout and improves reliability in high-vibration environments. |
| VOUT-disconnect on shutdown | Isolates output from input when EN/UVLO < 0.3V - prevents backfeed and meets automotive load-dump safety requirements. |
| Programmable fault response | Hiccup, latch-off, or continuous operation during short-circuit - configurable via SS-to-VREF resistor (no resistor = hiccup, 499kΩ = latch, 100kΩ = keep running). |
Applications
| Automotive Battery Charger | Industrial 24V/48V Power Supply |
|---|---|
Use Scenario: Regulating 12V/24V battery charging from variable alternator or solar input (6V–60V), maintaining constant current/voltage profile. IC Role / Device Role / Timing Role: Primary buck-boost controller managing both CV and CC stages; uses ISP/ISN for charge current regulation and FB for voltage regulation. Use Value: Enables single-stage charging across wide input range without manual reconfiguration; ±3% current accuracy ensures battery longevity and compliance with JEITA standards. | Use Scenario: Providing stable 24V or 48V output from unregulated factory bus (e.g., 18V–56V), powering PLC I/O modules and sensors. IC Role / Device Role / Timing Role: Voltage-regulating controller with PGOOD flag for system sequencing; operates in buck-boost region during brownout conditions. Use Value: Maintains regulated output during input dips below nominal; 98% peak efficiency at 4A/12V reduces thermal stress in enclosed enclosures. |
| Telecom 48V Backup System | High-Power Portable Equipment |
Use Scenario: Seamless switchover between AC/DC adapter and supercapacitor bank during mains failure, delivering uninterrupted 48V to base station radios. IC Role / Device Role / Timing Role: Bidirectional buck-boost controller regulating capacitor voltage during charge/discharge cycles; uses spread spectrum to meet CISPR-32 Class B emissions. Use Value: Eliminates need for separate charger and discharge regulator; ±15% SS modulation lowers 150kHz–1MHz EMI peaks by >10dB without filters. | Use Scenario: Powering portable test equipment from Li-ion battery (3V–16.8V) while delivering regulated 12V/5V outputs for analog front-ends and digital logic. IC Role / Device Role / Timing Role: Wide-input buck-boost controller supporting dynamic load steps; uses LOADTG to disconnect loads during deep sleep. Use Value: Extends runtime via high efficiency across entire battery discharge curve; LOADEN-driven load isolation cuts quiescent current to <2µA in shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8705EFE#PBF | Wider VIN (2.8V–80V), no spread spectrum, no integrated bootstrap diodes, requires external high-side drivers. | Preferred for ultra-low-VIN applications (e.g., 3.3V systems) but lacks EMI mitigation features and adds complexity. | Select LT8390JFE#PBF when spread spectrum, integrated bootstrap diodes, and AEC-Q100 qualification are required. |
| MPQ4333GQ-AEC1-Z | Monolithic 4-switch buck-boost (integrated MOSFETs), lower current rating (3.5A), fixed 400kHz, no ISP/ISN current monitor. | Suitable for space-constrained consumer-grade designs but cannot support >4A or precision current regulation. | Select LT8390JFE#PBF when external MOSFET flexibility, >4A capability, and dual current sensing are needed. |
Compared with LT8705EFE#PBF and MPQ4333GQ-AEC1-Z, the LT8390JFE#PBF uniquely combines AEC-Q100 Grade 1 rating, ±15% spread spectrum, integrated bootstrap diodes, and dual ISP/ISN current sensing - making it optimal for high-reliability, EMI-sensitive, and programmable-current applications where monolithic or non-automotive controllers fall short.
Availability
LT8390JFE#PBF is available at Aetrix Electronics and suitable for automotive battery management, industrial power supplies, and telecom backup systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8390JFE#PBF 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8390 product line delivers high-efficiency, wide-input-range synchronous 4-switch buck-boost controllers designed specifically for demanding automotive and industrial power conversion applications requiring seamless mode transitions and robust fault handling.
FAQ
What is the maximum junction temperature rating for the LT8390JFE#PBF?
The LT8390JFE#PBF is rated for operation from –40°C to +150°C junction temperature and is AEC-Q100 Grade 1 qualified. This specification is confirmed in the Order Information table and Absolute Maximum Ratings section of the official LT8390 datasheet Rev. D. Thermal derating applies above 125°C, and overtemperature protection activates above 150°C to safeguard the device.
Does the LT8390JFE#PBF support both input and output current regulation?
Yes, the LT8390JFE#PBF supports both input and output current regulation via its ISP/ISN differential current sense inputs. The device achieves ±3% accuracy across temperature and can be programmed for full-scale thresholds from 5mV to 100mV using the CTRL pin. This capability is explicitly documented in the Electrical Characteristics tables and Pin Functions section of the LT8390 datasheet Rev. D.
How does spread spectrum operation work on the LT8390JFE#PBF?
Spread spectrum on the LT8390JFE#PBF is enabled by connecting the SYNC/SPRD pin to INTVCC, which activates ±15% triangle modulation around the internal oscillator frequency. This feature is specified in the Features list and Electrical Characteristics table (Oscillator section) of the LT8390 datasheet Rev. D. It reduces peak EMI without requiring external clock sources or layout changes.
Can the LT8390JFE#PBF drive external PMOS load switches?
Yes, the LT8390JFE#PBF includes a dedicated high-side PMOS load switch driver via the LOADEN and LOADTG pins. When LOADEN is asserted, LOADTG provides an inverted, buffered gate drive referenced to VOUT (not GND), capable of driving PMOS FETs with VGS up to –5V. This function is detailed in the Pin Functions section and Features list of the LT8390 datasheet Rev. D.
What package type and thermal characteristics does the LT8390JFE#PBF use?
The LT8390JFE#PBF uses a 28-lead plastic TSSOP package with exposed pad (pin 29 = GND), with thermal resistance θJA = 30°C/W and θJC = 5°C/W. The exposed pad must be soldered to the PCB ground plane for optimal thermal performance. This information is specified in the Ordering Information table and Pin Configuration diagram of the LT8390 datasheet Rev. D.
LT8390JFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 150kHz ~ 650kHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT8390JFE#PBF FAQ
1.How can I place an order for LT8390JFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390JFE#PBF 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 LT8390JFE#PBF reliable?
The price and inventory of LT8390JFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390JFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8390JFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390JFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390JFE#PBF?
LT8390JFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390JFE#PBF 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 LT8390JFE#PBF?
For technical support, including LT8390JFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390JFE#PBF requirements.
6.How does Aetrix verify that LT8390JFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8390JFE#PBF 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 LT8390JFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8390JFE#PBF?
All LT8390JFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390JFE#PBF, 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 LT8390JFE#PBF part is unused and in its original packaging.
Return procedure for LT8390JFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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