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Analog Devices Inc. LT8390EUFD#TRPBF
- Part No.:
- LT8390EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390EUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,221
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Product details
Overview
LT8390EUFD#TRPBF 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 spread-spectrum EMI reduction. It regulates voltage or input/output current in automotive battery systems, industrial power supplies, and telecom voltage regulators where VIN may be above, below, or equal to VOUT.
For engineers reviewing the LT8390EUFD#TRPBF datasheet, LT8390EUFD#TRPBF pinout, LT8390EUFD#TRPBF application, or LT8390EUFD#TRPBF equivalent, key selection criteria include its peak-buck/peak-boost current mode control, integrated bootstrap diodes, high-side PMOS load switch driver, AEC-Q100 qualification, and QFN-28 (4mm × 5mm) package with exposed thermal pad.
Technical Context
The LT8390EUFD#TRPBF implements a proprietary dual-mode current sensing architecture using a single inductor current sense resistor (LSP/LSN) and separate ISP/ISN inputs for precise input/output current regulation. Its control logic dynamically selects between peak-buck and peak-boost modes based on real-time VIN/VOUT ratio - transitioning seamlessly across buck (VIN/VOUT > 1.33), buck-boost (0.75 < VIN/VOUT < 1.18), and boost (VIN/VOUT < 0.85) regions with hysteresis to prevent chattering.
It integrates two independent gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), internal 5V INTVCC LDO, 2V VREF reference, and programmable fault responses (retry, latch-off, or continuous operation) during output short-circuit events. Spread spectrum modulation is enabled via SYNC/SPRD pin tied to INTVCC, delivering ±15% triangle frequency deviation for EMI suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide-input applications including 12V/24V/48V automotive and industrial rails. |
| VOUT Range | 0V to 60V - enables bidirectional voltage regulation without polarity reversal hardware. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable CV regulation for sensitive loads like sensors or FPGAs. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables reliable CC charging of batteries and supercapacitors. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT resistor or external sync clock) - balances efficiency, size, and EMI in compact designs. |
| Spread Spectrum | ±15% triangle modulation - reduces peak EMI by spreading energy across frequency band without compromising regulation. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and harsh industrial environments. |
Pinout & Package
LT8390EUFD#TRPBF uses a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND), θJA = 43°C/W, θJC = 3.4°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG1, BG1, BST1, SW1, LSP, LSN | Buck-side power stage interface | Drive and sense buck-side MOSFETs and inductor current - enables high-efficiency step-down operation. |
| TG2, BG2, BST2, SW2, VOUT | Boost-side power stage interface | Drive and sense boost-side MOSFETs and output rail - enables step-up and buck-boost transitions. |
| ISP, ISN, ISMON | Input/output current monitor | Supports precision current regulation and monitoring with 10× gain + 0.25V offset for analog feedback loops. |
| FB, VC, CTRL, SS, RT, SYNC/SPRD | Control and configuration | Enable CV/CC regulation, soft-start timing, frequency setting, spread-spectrum activation, and fault response programming. |
| LOADEN, LOADTG | High-side PMOS load switch control | Allows controlled hot-swap or system-level power sequencing with VOUT-referenced gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters - reduces BOM count, board area, and design complexity. |
| Seamless region transition | No output disturbance during VIN/VOUT crossover - maintains regulated output during battery discharge or input transients. |
| Integrated bootstrap Schottky diodes | Removes external bootstrap diodes - simplifies layout and improves reliability in high-frequency switching. |
| AEC-Q100 Grade E qualification | Validated for automotive applications including engine control, ADAS power supplies, and infotainment systems. |
| VOUT-disconnect during shutdown | Prevents backfeed from output to input - critical for safety in battery-powered and redundant supply systems. |
Applications
| Automotive Battery Management | Industrial Telecom Power Supply |
|---|---|
Use Scenario: Regulating 12V battery output to stable 5V/3.3V for ECUs while accepting input from alternator (up to 60V) or cold-crank (down to 4V). IC Role / Device Role / Timing Role: Primary buck-boost controller managing bidirectional voltage conversion and input current limiting during charge/discharge cycles. Use Value: Maintains system uptime during cranking dips and alternator surges without brownouts or overvoltage damage. | Use Scenario: Providing isolated 48V intermediate bus from variable 24–60V industrial input, powering PoE switches and optical line cards. IC Role / Device Role / Timing Role: High-efficiency voltage regulator with programmable current limit and PGOOD signaling for system-level power sequencing. Use Value: Delivers >98% efficiency at 4A/12V output, reducing thermal load in dense telecom chassis. |
| Supercapacitor Charger/Discharger | Portable Medical Equipment Power |
Use Scenario: Charging/discharging 2.7V–5.5V supercapacitor banks from 12V vehicle or 24V industrial source with precise current control. IC Role / Device Role / Timing Role: Bidirectional current regulator using ISP/ISN inputs to enforce symmetric charge/discharge profiles. Use Value: Enables fast, safe energy buffering with ±3% current accuracy and reverse-current protection. | Use Scenario: Powering portable ultrasound or patient monitors from Li-ion battery (3.0–4.2V) while maintaining 3.3V/5V rails for analog front-end and digital subsystems. IC Role / Device Role / Timing Role: Wide-input buck-boost controller with low quiescent current (2.1µA in shutdown) and soft-start for clean power-up. Use Value: Extends battery life and eliminates cold-start failures during deep discharge conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8705IUFD#TRPBF | Wider input range (2.8V–80V); no integrated spread spectrum; requires external bootstrap diodes. | Better suited for ultra-low-VIN applications (e.g., single-cell Li-ion input), but lacks EMI-reduction features. | Select when input can drop below 4V or when higher VIN tolerance (>60V) is required; avoid if spread spectrum or integrated diodes are mandatory. |
| MPQ4332GR-AEC1-Z | 4-switch buck-boost controller with 3.3V–60V input; fixed 400kHz frequency; no ISP/ISN current monitor; AEC-Q100 qualified. | Limited to fixed-frequency operation and lacks programmable current regulation - suitable only for basic CV regulation. | Choose for cost-sensitive automotive modules needing AEC-Q100 compliance but not requiring precision CC control or frequency tuning. |
Compared with LT8390EUFD#TRPBF, LT8705IUFD#TRPBF offers broader VIN range but sacrifices EMI performance and integration, while MPQ4332GR-AEC1-Z provides lower-cost AEC-Q100 compliance at the expense of current monitoring flexibility and spread-spectrum capability.
Availability
LT8390EUFD#TRPBF is available at Aetrix Electronics and suitable for automotive battery management, industrial telecom power supplies, and portable medical equipment requiring stable component supply, AEC-Q100 qualification, and wide-input buck-boost regulation.
Supply support for LT8390EUFD#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. 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 robust, high-efficiency 4-switch buck-boost controllers for applications demanding seamless VIN/VOUT crossover, precise current regulation, and automotive-grade reliability - targeting next-generation EV power systems and intelligent infrastructure.
FAQ
What is the maximum output voltage supported by the LT8390EUFD#TRPBF?
The LT8390EUFD#TRPBF supports an output voltage range of 0V to 60V. This capability allows it to regulate outputs both above and below the input voltage, making it ideal for applications such as automotive battery backup systems and industrial power supplies where flexible voltage translation is required. The ±1.5% output voltage accuracy applies across the full 1V to 60V range.
Does the LT8390EUFD#TRPBF include integrated bootstrap diodes?
Yes, the LT8390EUFD#TRPBF integrates Schottky bootstrap diodes on both BST1 and BST2 pins, eliminating the need for external diodes in typical buck-boost configurations. This integration reduces component count, improves reliability, and simplifies PCB layout - particularly beneficial in space-constrained automotive and telecom designs where layout parasitics impact performance.
How does the LT8390EUFD#TRPBF handle transitions between buck, buck-boost, and boost operating regions?
The LT8390EUFD#TRPBF uses a proprietary peak-buck/peak-boost current mode control scheme that monitors the VIN/VOUT ratio in real time and automatically selects the optimal operating mode. Transitions occur smoothly at defined hysteresis thresholds (e.g., buck-to-buck-boost at VIN/VOUT ≈ 1.33, buck-boost-to-boost at ≈ 0.75), preventing output disturbance or control-loop instability during input transients or load changes.
Can the LT8390EUFD#TRPBF regulate input current, and how is it configured?
Yes, the LT8390EUFD#TRPBF supports precise input current regulation using the ISP and ISN pins. By connecting a sense resistor between these terminals and applying a voltage to the CTRL pin, the device sets the current threshold linearly from 5mV to 100mV. The ISMON pin provides a buffered 10× scaled output plus 0.25V offset, enabling direct interfacing with microcontrollers or analog monitoring circuits for battery charging or overload protection.
Is the LT8390EUFD#TRPBF qualified for automotive applications?
Yes, the LT8390EUFD#TRPBF is AEC-Q100 qualified for automotive applications (Grade E, –40°C to +125°C junction temperature). It meets stringent reliability, thermal, and ESD requirements for use in engine control units, ADAS power supplies, infotainment systems, and body electronics - with built-in fault protections including output short-circuit detection and programmable response modes (retry, latch-off, or keep-running).
LT8390EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-QFN (4x5)
LT8390EUFD#TRPBF FAQ
1.How can I place an order for LT8390EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390EUFD#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 LT8390EUFD#TRPBF reliable?
The price and inventory of LT8390EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390EUFD#TRPBF?
LT8390EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390EUFD#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 LT8390EUFD#TRPBF?
For technical support, including LT8390EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390EUFD#TRPBF requirements.
6.How does Aetrix verify that LT8390EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390EUFD#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 LT8390EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390EUFD#TRPBF?
All LT8390EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390EUFD#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 LT8390EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT8390EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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