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Analog Devices Inc. LT8390EUFD#PBF
- Part No.:
- LT8390EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390EUFD#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:257
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Product details
Overview
LT8390EUFD#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 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#PBF datasheet, LT8390EUFD#PBF pinout, LT8390EUFD#PBF application, or LT8390EUFD#PBF equivalent, key selection considerations include its peak-buck/peak-boost current mode control, integrated bootstrap diodes, high-side PMOS load switch driver (LOADTG), AEC-Q100 qualification for automotive use, and QFN-28 (4mm × 5mm) package with exposed thermal pad.
Technical Context
The LT8390EUFD#PBF 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 at thresholds of 0.75 (buck→buck-boost), 0.85 (buck-boost→boost), 1.18 (buck→buck-boost), and 1.33 (buck-boost→boost).
It integrates two independent gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), internal 5V INTVCC LDO, 2V VREF reference, and fault protection including PGOOD flag, FB overvoltage/short detection, and configurable short-circuit response (hiccup/latch-off/keep-running). The SYNC/SPRD pin supports either external clock synchronization or ±15% triangle spread-spectrum modulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range battery and industrial input sources without pre-regulation. |
| Output Voltage Range | 0V to 60V - enables true buck-boost operation across all VIN/VOUT relationships. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT resistor or external sync) - balances efficiency, size, and EMI performance. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation under load, line, and temperature variation. |
| Current Sense Accuracy | ±3% for input/output current monitoring (ISP/ISN) - enables precise CC/CV battery charging and power limiting. |
| Efficiency | Up to 98% at 12V/4A - minimizes thermal stress and improves system power density. |
| Package | 28-Lead QFN (4mm × 5mm) with exposed pad - provides low θJC = 3.4°C/W for high-power thermal management. |
Pinout & Package
LT8390EUFD#PBF uses a 28-lead plastic QFN package (4mm × 5mm) with exposed thermal pad (Pin 29 = GND), rated for –40°C to +125°C junction temperature. Thermal resistance: θJA = 43°C/W, θJC = 3.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage feedback input | Regulates output to 1.00V reference; triggers PGOOD and fault protection when out-of-range. |
| ISP / ISN | Differential current sense inputs | Monitor input or output current with ±3% accuracy; support Kelvin connection for precision. |
| LSP / LSN | Inductor current sense terminals | Provide primary current feedback for peak-buck/peak-boost control; enable seamless region transitions. |
| TG1 / BG1 / SW1 / BST1 | Buck-side power switch interface | Drive external N-MOSFETs in buck topology; integrated bootstrap diode reduces component count. |
| TG2 / BG2 / SW2 / BST2 | Boost-side power switch interface | Drive external N-MOSFETs in boost topology; independent timing prevents shoot-through. |
| LOADEN / LOADTG | High-side PMOS load switch control | Enables/disables external PMOS FET; LOADTG provides buffered inverted drive referenced to VOUT. |
| SYNC/SPRD | Frequency control input | Ground = fixed frequency; INTVCC = ±15% spread spectrum; external clock = synchronization. |
| RT | Oscillator timing resistor | Resistor to GND sets switching frequency from 150kHz to 650kHz with ±10% tolerance. |
| PGOOD | Open-drain status flag | Pulled low when FB is within ±10% of target - used for system power sequencing and fault indication. |
| GND (Pin 29) | Power and signal ground | Exposed thermal pad must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters; reduces BOM, board area, and design complexity. |
| Proprietary peak-buck/peak-boost current mode | Ensures stable, jitter-free transitions between buck, buck-boost, and boost regions without audible noise or regulation glitches. |
| Integrated bootstrap Schottky diodes | Removes requirement for external bootstrap diodes - simplifies layout and improves reliability in high-frequency operation. |
| Spread-spectrum frequency modulation | Reduces peak EMI by ±15% triangular dithering - helps meet CISPR 25 Class 5 automotive emissions requirements. |
| AEC-Q100 qualified (Grade E) | Validated for automotive applications including infotainment, ADAS power rails, and 12V/48V hybrid systems. |
Applications
| Automotive Battery Management | Industrial Wide-Input Power Supply |
|---|---|
Use Scenario: Regulating 12V battery output while accepting input from 6V–56V alternator, start-stop, or supercapacitor sources. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller managing bidirectional energy flow and maintaining stable 12V rail during cold-crank or load-dump events. Use Value: Enables single-stage conversion without pre-regulators or post-regulators; ±1.5% VOUT accuracy ensures compatibility with automotive ECUs and sensors. | Use Scenario: Powering programmable logic controllers (PLCs) and I/O modules from unregulated 24V–48V factory bus with variable load profiles. IC Role / Device Role / Timing Role: High-efficiency DC/DC controller delivering up to 48W (12V/4A) with seamless transition across input dips and surges. Use Value: 98% peak efficiency and low quiescent current (<2.8µA shutdown) extend uptime and reduce thermal derating in enclosed enclosures. |
| Telecom 48V Backup System | High-Power Portable Equipment |
Use Scenario: Maintaining uninterrupted 48V output from lithium-ion battery packs (30V–42V) or rectified AC input during grid failure. IC Role / Device Role / Timing Role: Bidirectional buck-boost controller supporting both battery discharge (boost) and charge (buck) with current monitoring on ISP/ISN. Use Value: ±3% current sense accuracy enables precise battery charge termination and health monitoring per JEITA standards. | Use Scenario: Powering portable test equipment requiring stable 5V/3.3V rails from 10.8V–25.2V multi-cell Li-ion batteries. IC Role / Device Role / Timing Role: Compact, thermally efficient controller in QFN-28 package enabling high-density PCB layouts with minimal heatsinking. Use Value: Exposed-pad QFN package (θJC = 3.4°C/W) sustains 4A continuous output without forced air cooling in handheld enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8708IUFD#PBF | Single-inductor buck-boost controller with wider 2.8V–80V input, no integrated ISP/ISN current monitor, no spread spectrum. | Targeted at higher-input industrial systems; lacks built-in current regulation for battery charging. | Choose LT8708 for >60V input or when ISP/ISN monitoring is unnecessary; LT8390EUFD#PBF preferred for automotive CC/CV charging. |
| MPQ4420AGU-AEC1-P | 4-switch buck-boost controller with 4V–60V input, but only 1.2V–24V output range and no spread spectrum or AEC-Q100 Grade 1 rating. | Designed for consumer-grade automotive infotainment; limited VOUT range excludes telecom/industrial 48V use cases. | MPQ4420 suits cost-sensitive non-safety systems; LT8390EUFD#PBF required for full 0–60V output and AEC-Q100 Grade E compliance. |
Compared with LT8708IUFD#PBF and MPQ4420AGU-AEC1-P, the LT8390EUFD#PBF uniquely combines full 0–60V output capability, ±3% ISP/ISN current monitoring, ±15% spread spectrum, and AEC-Q100 Grade E qualification - making it the only option for automotive battery chargers and wide-range telecom backup systems requiring both precision and robustness.
Availability
LT8390EUFD#PBF is available at Aetrix Electronics and suitable for automotive battery management, industrial wide-input power supplies, and telecom 48V backup systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8390EUFD#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 LT8390EUFD#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive and industrial applications requiring seamless buck-boost operation, low EMI, and robust fault protection.
FAQ
What is the operating temperature range for the LT8390EUFD#PBF?
The LT8390EUFD#PBF is specified for a junction temperature range of –40°C to +125°C and is packaged in a 28-lead QFN (4mm × 5mm) with exposed thermal pad. This Grade E rating meets AEC-Q100 requirements for automotive under-hood and industrial environments where ambient temperatures exceed 85°C.
Does the LT8390EUFD#PBF support both input and output current regulation?
Yes, the LT8390EUFD#PBF supports precise ±3% current regulation using dedicated ISP/ISN pins for input or output current sensing, and LSP/LSN pins for inductor current measurement. The CTRL pin allows dynamic programming of the current limit threshold from 5mV to 100mV, enabling flexible CC/CV battery charging and power limiting.
How does the LT8390EUFD#PBF handle transitions between buck, buck-boost, and boost modes?
The LT8390EUFD#PBF uses a proprietary peak-buck/peak-boost current mode control scheme that automatically and seamlessly transitions between operation regions based on real-time VIN/VOUT ratio - with hysteresis at 0.75 (buck→buck-boost), 0.85 (buck-boost→boost), 1.18 (buck→buck-boost), and 1.33 (buck-boost→boost) to prevent chattering and maintain regulation stability.
Can the LT8390EUFD#PBF be synchronized to an external clock?
Yes, the LT8390EUFD#PBF supports external clock synchronization via the SYNC/SPRD pin. When driven with a TTL/CMOS-compatible clock signal between 150kHz and 650kHz, the device locks its switching frequency to the external source - enabling deterministic EMI reduction and multi-phase interleaving in high-power systems.
What fault protection features are included in the LT8390EUFD#PBF?
The LT8390EUFD#PBF includes comprehensive fault protection: FB overvoltage (1.10V threshold) and short-circuit (0.25V threshold) detection, output short-circuit response configurable as hiccup, latch-off, or keep-running, PGOOD flag for system sequencing, and thermal shutdown. All protections are active across the full –40°C to +125°C operating range.
LT8390EUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN 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-QFN (4x5)
LT8390EUFD#PBF FAQ
1.How can I place an order for LT8390EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390EUFD#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 LT8390EUFD#PBF reliable?
The price and inventory of LT8390EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT8390EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390EUFD#PBF?
LT8390EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390EUFD#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 LT8390EUFD#PBF?
For technical support, including LT8390EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390EUFD#PBF requirements.
6.How does Aetrix verify that LT8390EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8390EUFD#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 LT8390EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT8390EUFD#PBF?
All LT8390EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390EUFD#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 LT8390EUFD#PBF part is unused and in its original packaging.
Return procedure for LT8390EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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