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Analog Devices Inc. LT8390IFE#PBF
- Part No.:
- LT8390IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390IFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 28TSS
- Quantity:
- Payment:
- Shipping:
Inventory:325
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Product details
Overview
LT8390IFE#PBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V–60V input and 0V–60V output, regulating voltage or input/output current with ±1.5% VOUT accuracy (1V–60V), ±3% current sense accuracy, and up to 98% efficiency in 48W (12V/4A) configurations. It enables seamless transitions between buck, buck-boost, and boost regions for automotive battery chargers, industrial power supplies, and telecom voltage regulators.
For engineers reviewing the LT8390IFE#PBF datasheet, LT8390IFE#PBF pinout, LT8390IFE#PBF application, or LT8390IFE#PBF equivalent, key selection considerations include its AEC-Q100 qualification, spread-spectrum EMI reduction, 150kHz–650kHz adjustable switching frequency, integrated bootstrap diodes, and high-side PMOS load switch driver capability.
Technical Context
The LT8390IFE#PBF implements a proprietary peak-buck/peak-boost current mode control architecture using a single inductor current sense resistor (LSP/LSN) and dual independent current comparators. It dynamically selects operating region-buck (VIN/VOUT ≤ 0.75), buck-boost (0.75 < VIN/VOUT < 1.33), or boost (VIN/VOUT ≥ 1.33)-with hysteresis to prevent mode chatter.
Its control loop integrates two error amplifiers (EA1 for voltage regulation via FB/VC, EA2 for current regulation via ISP/ISN), synchronized oscillator with RT pin programming, and dedicated LOADEN/LOADTG circuitry enabling controlled disconnection of VOUT from VIN during shutdown. The device supports both internal ±15% triangle spread spectrum and external clock synchronization via SYNC/SPRD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range inputs including 12V/24V/48V automotive and industrial rails. |
| Output Voltage Range | 0V to 60V - enables bidirectional regulation, battery charging, and supercapacitor management. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT) - balances efficiency, size, and EMI; ±15% spread spectrum reduces peak emissions. |
| VOUT Regulation Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable output under line/load/temperature variation for precision systems. |
| Current Sense Accuracy | ±3% (ISP/ISN) - enables reliable input or output current limiting and monitoring in CC/CV applications. |
| Efficiency | Up to 98% at 12V/4A - minimizes thermal stress and enables compact 28-lead TSSOP packaging with exposed pad. |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive and harsh industrial environments. |
| AEC-Q100 Grade | Grade I - certified for automotive applications requiring reliability and extended temperature operation. |
Pinout & Package
LT8390IFE#PBF is housed in a 28-lead plastic TSSOP package with exposed pad (GND), θJA = 30°C/W, θJC = 5°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1, BG2 | Buck/Boost Bottom Gate Drivers | Drive N-channel MOSFETs from GND to INTVCC; enable synchronous rectification in both regions. |
| TG1, TG2 | Buck/Boost Top Gate Drivers | Drive N-channel MOSFETs from SWx to BSTx; require external bootstrap capacitors on BST1/BST2. |
| LSP/LSN | Buck-Side Inductor Current Sense | Kelvin-connected inputs for accurate inductor current measurement in all operating regions. |
| ISP/ISN | Input/Output Current Sense | High-accuracy differential inputs for programmable input or output current regulation (±3%). |
| LOADEN / LOADTG | High-Side PMOS Load Switch Control | LOADEN enables/disables the buffered inverted LOADTG gate drive (VOUT–5V to VOUT). |
| SYNC/SPRD | Frequency Control Input | GND = fixed frequency; INTVCC = ±15% spread spectrum; external clock = synchronization. |
| FB / VC / RT / SS | Feedback, Compensation, Frequency, Soft-Start | Standard control interface: FB sets VOUT, VC compensates loop, RT sets fSW, SS controls startup ramp. |
Key Features
| Feature | Design Value |
|---|---|
| 4-Switch Single-Inductor Architecture | Eliminates need for separate buck and boost converters; reduces BOM count and board area in VIN-above/below-VOUT systems. |
| Seamless Region Transitions | No output disturbance during buck ↔ buck-boost ↔ boost mode changes; critical for uninterrupted power in automotive start-stop. |
| Integrated Bootstrap Diodes | Reduces external component count by embedding Schottky diodes from INTVCC to BST1/BST2 pins. |
| VOUT Disconnection During Shutdown | Isolates output from input when EN/UVLO < 0.3V - prevents backfeed and meets automotive safety requirements. |
| Programmable Fault Protection | Configurable short-circuit response (hiccup/latch-off/keep-running) via SS-to-VREF resistor network. |
| High-Side PMOS Load Switch Driver | LOADTG provides rail-to-rail gate drive referenced to VOUT - enables efficient hot-swap and load disconnect. |
Applications
| Automotive Battery Charger | Industrial Wide-Input Power Supply |
|---|---|
Use Scenario: Charging 12V lead-acid or LiFePO4 batteries from variable vehicle bus (6V–40V) during engine start-stop cycles. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller regulating constant-current/constant-voltage charge profile with seamless VIN/VOUT transitions. Use Value: Maintains >95% efficiency across full input range and eliminates output dropout during cranking transients (e.g., 6V dips). | Use Scenario: Powering 24V PLC I/O modules from unregulated 18V–56V industrial DC rails with strict EMI limits. IC Role / Device Role / Timing Role: EMI-optimized DC/DC controller with spread-spectrum modulation and low-noise region transitions. Use Value: Meets CISPR-22 Class B conducted emissions without added shielding or filtering components. |
| Telecom 48V Backup System | High-Power Portable Equipment |
Use Scenario: Regulating 48V backup battery output to stable 12V/3.3V system rails during AC failure in telecom base stations. IC Role / Device Role / Timing Role: Bidirectional buck-boost controller supporting both discharge (boost) and recharge (buck) modes with current monitoring. Use Value: Enables single-converter architecture for battery backup and charging - reducing cost and footprint vs. dual-controller solutions. | Use Scenario: Powering portable test equipment with 12V output from 3S–12S Li-ion packs (10.8V–50.4V) while maintaining USB-C PD compatibility. IC Role / Device Role / Timing Role: Wide-input buck-boost controller with programmable current limit and PGOOD signaling for system-level fault handling. Use Value: Delivers 4A continuous output with ±1.5% regulation accuracy across full battery SOC, extending runtime and protecting downstream loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous 4-switch buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | Fixed 200kHz–600kHz frequency; no spread spectrum; lower max input (40V); no AEC-Q100 qualification. | Suitable for non-automotive industrial supplies where EMI is less constrained and input stays ≤40V. | Select LTC3780EFE#PBF only if spread spectrum and 60V input are not required; verify thermal derating at 125°C junction. |
| MPQ4332GJ-AEC1-Z | Integrated MOSFETs (40V max); fixed 400kHz; no ISP/ISN current monitor; no LOADTG driver; smaller QFN-24 package. | Targeted at space-constrained consumer/industrial apps needing integrated FETs and simpler current limiting. | Choose MPQ4332GJ-AEC1-Z for lower-cost, lower-power (<25W) designs where external FETs and advanced current monitoring are unnecessary. |
Compared with LTC3780EFE#PBF and MPQ4332GJ-AEC1-Z, the LT8390IFE#PBF uniquely combines 60V operation, AEC-Q100 qualification, spread-spectrum EMI reduction, and dedicated high-side load switch control - making it optimal for demanding automotive and industrial power systems requiring robustness and flexibility.
Availability
LT8390IFE#PBF is available at Aetrix Electronics and suitable for automotive battery management, industrial wide-input power supplies, and telecom backup systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LT8390IFE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8390IFE#PBF belongs to ADI's Power by Linear™ controller family, engineered specifically for high-efficiency, wide-input-range DC/DC conversion in safety-critical and thermally constrained environments.
FAQ
What is the maximum input voltage rating for the LT8390IFE#PBF?
The LT8390IFE#PBF has an absolute maximum input voltage (VIN) rating of 60V, with guaranteed operation across a 4V to 60V input range. This allows direct use with 48V telecom systems, 36V industrial rails, and 12V/24V automotive batteries including cold-crank and load-dump conditions. Exceeding 60V may cause permanent damage per Absolute Maximum Ratings.
Does the LT8390IFE#PBF support both input and output current regulation?
Yes, the LT8390IFE#PBF supports precise ±3% accurate regulation of either input current (via ISP/ISN pins) or output current (via LSP/LSN pins), selectable through configuration of the CTRL pin and feedback network. This dual-mode capability makes the LT8390IFE#PBF ideal for battery charging (CC/CV), LED drivers, and programmable current sources.
How does the LT8390IFE#PBF achieve low EMI performance?
The LT8390IFE#PBF achieves low EMI through integrated ±15% triangle spread-spectrum frequency modulation (enabled by tying SYNC/SPRD to INTVCC), coupled with seamless buck/buck-boost/boost region transitions that eliminate switching discontinuities. Its 4-switch architecture also avoids the high dI/dt edges typical of conventional boost converters, further reducing radiated emissions.
What package type and thermal characteristics does the LT8390IFE#PBF use?
The LT8390IFE#PBF uses a 28-lead plastic TSSOP package with exposed pad (pin 29 = GND). Its thermal resistance is θJA = 30°C/W and θJC = 5°C/W when the exposed pad is properly soldered to a 4-layer PCB with ≥2 in² copper pour. This enables 48W operation at 125°C ambient with appropriate layout and airflow.
Is the LT8390IFE#PBF qualified for automotive applications?
Yes, the LT8390IFE#PBF is AEC-Q100 qualified (Grade I, –40°C to +125°C) and designed for automotive applications including battery chargers, start-stop systems, and infotainment power supplies. It includes built-in overtemperature protection, short-circuit recovery modes, and robust ESD tolerance - meeting stringent automotive reliability and safety requirements.
LT8390IFE#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:
- 190kHz ~ 630kHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT8390IFE#PBF FAQ
1.How can I place an order for LT8390IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390IFE#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 LT8390IFE#PBF reliable?
The price and inventory of LT8390IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8390IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390IFE#PBF?
LT8390IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390IFE#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 LT8390IFE#PBF?
For technical support, including LT8390IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390IFE#PBF requirements.
6.How does Aetrix verify that LT8390IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8390IFE#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 LT8390IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8390IFE#PBF?
All LT8390IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390IFE#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 LT8390IFE#PBF part is unused and in its original packaging.
Return procedure for LT8390IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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