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Analog Devices Inc. LT8390IUFD#PBF
- Part No.:
- LT8390IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390IUFD#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:125
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Product details
Overview
LT8390IUFD#PBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V to 60V input and 0V to 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 LT8390IUFD#PBF datasheet, LT8390IUFD#PBF pinout, LT8390IUFD#PBF application, or LT8390IUFD#PBF equivalent, key selection considerations include its peak-buck/peak-boost current mode control architecture, 28-pin QFN (4mm × 5mm) package with exposed thermal pad, AEC-Q100 qualification for automotive use, and integrated bootstrap diodes enabling compact high-efficiency designs.
Technical Context
The LT8390IUFD#PBF implements a proprietary dual-mode current sensing scheme using a single inductor sense resistor (LSP/LSN) to support seamless transitions between buck, buck-boost, and boost regions based on VIN/VOUT ratio - with defined transition thresholds at 0.75 (buck-boost→boost), 0.85 (boost→buck-boost), 1.18 (buck→buck-boost), and 1.33 (buck-boost→buck). Its internal error amplifier (VC) sets current comparator thresholds while FB regulates output to 1.00V reference.
Control logic includes independent gate drivers for four external NMOS switches (TG1/BG1/TG2/BG2), integrated high-side PMOS load switch driver (LOADTG), and programmable fault responses (retry/latch-off/keep-running) during output short-circuit events. Spread spectrum modulation is enabled by tying SYNC/SPRD to INTVCC, delivering ±15% triangle frequency dithering around the oscillator setpoint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range inputs including automotive battery (9–16V), industrial rails (12–48V), and supercapacitor backup (0–60V). |
| Output Voltage Range | 0V to 60V - enables bidirectional regulation and battery charging/discharging applications without polarity reversal. |
| Switching Frequency | 150kHz to 650kHz - adjustable via RT resistor; synchronizable externally or modulated with ±15% spread spectrum for EMI compliance. |
| Output Voltage Accuracy | ±1.5% over –40°C to 125°C - ensures stable regulation across automotive temperature extremes without calibration. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - provides reliable input/output current limiting and telemetry in CV/CC battery charger designs. |
| Package | 28-Lead QFN (4mm × 5mm) with exposed thermal pad - delivers θJC = 3.4°C/W for high-power operation up to 48W (12V/4A) at 98% efficiency. |
| AEC-Q100 Grade | Grade I (–40°C to +125°C junction) - qualified for automotive infotainment, ADAS power supplies, and body electronics. |
Pinout & Package
LT8390IUFD#PBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND), optimized for thermal performance (θJA = 43°C/W, θJC = 3.4°C/W) in space-constrained automotive and industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG1, BG1, TG2, BG2 | NMOS gate drivers | Drive external high-side (TG1/TG2) and low-side (BG1/BG2) N-channel MOSFETs with 2.6Ω pull-up / 1.4Ω pull-down resistance and <25ns rise/fall times. |
| BST1, BST2 | Bootstrap floating supplies | Integrate Schottky diodes from INTVCC; require external capacitors to SW1/SW2 for high-side NMOS gate drive above VIN/VOUT. |
| LSP, LSN | Buck-side inductor current sense | Kelvin-connected inputs for accurate inductor current measurement in all operating regions (buck/buck-boost/boost). |
| ISP, ISN | Input/output current monitor | Dedicated differential inputs for precise current regulation and protection; ISMON outputs 10×(VISP–VISN)+0.25V. |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables the external PMOS; LOADTG provides buffered inverted gate drive referenced to VOUT. |
| SYNC/SPRD | Frequency control | GND = fixed frequency; INTVCC = ±15% spread spectrum; external clock = synchronization - no external components needed for EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters - reduces BOM count, PCB area, and design complexity in wide-input-range systems. |
| Seamless region transitions | No output glitches or regulation loss when crossing VIN/VOUT boundaries (e.g., cold-crank 6V → nominal 14V in automotive start-stop). |
| Integrated bootstrap diodes | Removes two external Schottky diodes per side - simplifies layout, improves reliability, and reduces component count in high-density designs. |
| VOUT disconnection during shutdown | Isolates output from input when EN/UVLO < 0.3V - prevents backfeed in battery-powered systems and meets automotive sleep-mode requirements. |
| Programmable fault response | Three short-circuit recovery modes (hiccup/latch-off/keep-running) selected via SS-to-VREF resistor - enables system-level safety tailoring without firmware. |
Applications
| Automotive Battery Management | Industrial Wide-Range Power Supply |
|---|---|
Use Scenario: Regulating 12V battery rail in start-stop vehicles where input drops to 6V during cranking and rises to 16V during alternator charging. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller maintaining stable 12V output across full VIN range using peak-buck/peak-boost current mode. Use Value: Eliminates need for separate pre-regulator and post-regulator stages; achieves >95% efficiency at 4A load across all operating regions. | Use Scenario: Powering FPGA or DSP in factory automation equipment with unregulated 24V–48V DC bus subject to line transients. IC Role / Device Role / Timing Role: Voltage regulator IC providing constant 3.3V/5V output regardless of input variation, with spread-spectrum EMI suppression for EMC compliance. Use Value: Meets CISPR-22 Class B emissions limits without added shielding or filtering; supports 48W continuous output in 4mm × 5mm footprint. |
| Telecom 48V Backup System | High-Power Portable Equipment |
Use Scenario: Charging and discharging supercapacitor banks in 48V telecom base station backup systems. IC Role / Device Role / Timing Role: Bidirectional current-controlled DC/DC controller regulating both charge (buck) and discharge (boost) paths with ±3% current accuracy. Use Value: Enables precise CV/CC charging profiles and real-time current telemetry via ISMON output - critical for battery health monitoring. | Use Scenario: Power management in portable test equipment requiring 5V/3A output from Li-ion battery (3.0–4.2V) or USB-C PD (5–20V) input. IC Role / Device Role / Timing Role: Single-chip buck-boost solution supporting input below and above output, with soft-start and PGOOD signaling for system sequencing. Use Value: Reduces solution size by 40% vs dual-converter approach; PGOOD flag ensures clean power-up of downstream processors and ADCs. |
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 |
|---|---|---|---|
| LT8705IUFD#PBF | Wider input range (2.8V–80V); no integrated spread spectrum; requires external bootstrap diodes. | Preferred for ultra-low VIN (e.g., single-cell Li-ion) or higher-voltage industrial rails; lacks built-in EMI reduction features. | Select when input may fall below 4V or exceed 60V; accept added board area and layout complexity for bootstrap diodes. |
| MPQ4420AGU-AEC1-P | 3.3V–60V input; 4-switch architecture; AEC-Q100 Grade 1; no ISP/ISN current monitor or spread spectrum. | Suitable for cost-sensitive automotive modules where only voltage regulation is required; lacks precision current telemetry. | Choose for basic buck-boost regulation without current monitoring or EMI optimization - lower BOM cost but reduced feature set. |
Compared with LT8705IUFD#PBF and MPQ4420AGU-AEC1-P, the LT8390IUFD#PBF uniquely integrates spread-spectrum EMI reduction, dual current sense (LSP/LSN + ISP/ISN), and programmable fault recovery - making it optimal for automotive and industrial applications demanding robustness, regulatory compliance, and system-level diagnostics.
Availability
LT8390IUFD#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 with AEC-Q100 qualification and long-term lifecycle support.
Supply support for LT8390IUFD#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.
The LT8390 product line delivers high-efficiency, wide-input-range DC/DC controllers for demanding environments - designed specifically for automotive, industrial, and telecom applications where reliability, thermal performance, and EMI compliance are critical.
FAQ
What is the maximum output power achievable with the LT8390IUFD#PBF in a typical 12V/4A application?
The LT8390IUFD#PBF achieves up to 48W output power (12V × 4A) with 98% efficiency in buck-boost configuration, as verified in the typical application circuit. Thermal performance is enabled by its 28-lead QFN package with exposed pad (θJC = 3.4°C/W), allowing sustained operation at full load under proper PCB copper pour and airflow conditions.
Does the LT8390IUFD#PBF support both input and output current regulation, and how is it implemented?
Yes, the LT8390IUFD#PBF supports both input and output current regulation using dedicated ISP/ISN differential inputs with ±3% accuracy. Regulation is achieved by feeding the ISMON monitor output (10×VISP–VISN + 0.25V) into the CTRL pin or external op-amp loop - enabling precise CV/CC battery charging, LED driving, or overload protection without additional ICs.
How does the LT8390IUFD#PBF handle transitions between buck, buck-boost, and boost operating regions?
The LT8390IUFD#PBF uses a proprietary peak-buck/peak-boost current mode control scheme that automatically detects VIN/VOUT ratios and switches between four states with hysteresis. Transitions occur smoothly at defined thresholds (e.g., 0.75 for buck-boost→boost, 1.18 for buck→buck-boost), eliminating output voltage glitches and ensuring uninterrupted regulation during dynamic input changes.
What package and thermal characteristics define the LT8390IUFD#PBF, and how do they impact layout?
The LT8390IUFD#PBF uses a 28-lead 4mm × 5mm QFN with exposed thermal pad (Pin 29 = GND). Its θJC = 3.4°C/W requires direct soldering of the pad to a large internal ground plane; recommended layout includes ≥4 thermal vias under the pad and minimum 1µF ceramic bypassing on VIN, VOUT, and INTVCC pins per datasheet guidelines.
Can the LT8390IUFD#PBF be synchronized to an external clock, and what are the voltage requirements for the SYNC/SPRD pin?
Yes, the LT8390IUFD#PBF supports external synchronization via the SYNC/SPRD pin. When driven with a TTL/CMOS clock (150kHz–650kHz), the pin accepts 0.4V–1.5V logic thresholds. For spread-spectrum operation, tie SYNC/SPRD to INTVCC (5V); for fixed-frequency operation, ground the pin. Input bias current is ±0.1µA, minimizing loading on clock sources.
LT8390IUFD#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)
LT8390IUFD#PBF FAQ
1.How can I place an order for LT8390IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390IUFD#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 LT8390IUFD#PBF reliable?
The price and inventory of LT8390IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT8390IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390IUFD#PBF?
LT8390IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390IUFD#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 LT8390IUFD#PBF?
For technical support, including LT8390IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390IUFD#PBF requirements.
6.How does Aetrix verify that LT8390IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8390IUFD#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 LT8390IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT8390IUFD#PBF?
All LT8390IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390IUFD#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 LT8390IUFD#PBF part is unused and in its original packaging.
Return procedure for LT8390IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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