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Analog Devices Inc. LT8390HUFD#PBF
- Part No.:
- LT8390HUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390HUFD#PBF.pdf
- Description:
- 60V SYNCHRONOUS 4-SWITCH BUCK-BO
- Quantity:
- Payment:
- Shipping:
Inventory:1,821
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Product details
Overview
LT8390HUFD#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 qualification for automotive systems. It enables seamless VIN-above/VIN-below/VIN-equal-to-VOUT regulation in battery charger, telecom power, and industrial voltage regulator applications.
For engineers reviewing the LT8390HUFD#PBF datasheet, LT8390HUFD#PBF pinout, LT8390HUFD#PBF application, or LT8390HUFD#PBF equivalent, key selection considerations include its peak-buck/peak-boost current mode control architecture, integrated bootstrap diodes, spread spectrum EMI reduction, high-side PMOS load switch driver, and QFN-28 (4mm × 5mm) package with exposed thermal pad rated to 150°C junction temperature.
Technical Context
The LT8390HUFD#PBF implements a proprietary dual-mode current sensing scheme using a single inductor current sense resistor (LSP/LSN) and separate ISP/ISN inputs for input/output current monitoring. Its control logic dynamically selects between peak-buck and peak-boost modes based on real-time VIN/VOUT ratio - transitioning at precisely defined thresholds (e.g., buck-boost to boost at VIN/VOUT = 0.75, buck to buck-boost at 1.18).
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/keep-running) during output short-circuit events. Spread spectrum modulation is enabled via SYNC/SPRD pin tied to INTVCC, delivering ±15% triangle dither around the oscillator frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range battery and industrial bus inputs without pre-regulation. |
| Output Voltage Range | 0V to 60V - enables bidirectional regulation including zero-output capability for controlled discharge. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT resistor) - balances efficiency, size, and EMI across applications. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation under line/load/temperature variation. |
| Current Sense Accuracy | ±3% for input/output current monitoring - enables precise battery charge/discharge control and system protection. |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood automotive and high-temp industrial environments. |
| Package | 28-Lead QFN (4mm × 5mm) with exposed GND pad - provides low θJC = 3.4°C/W for thermally demanding layouts. |
Pinout & Package
LT8390HUFD#PBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND). The package supports high-power density designs with θJA = 43°C/W and θJC = 3.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG1, BG1, SW1, BST1, LSP, LSN | Buck-side power stage interface | Drive and sense the buck-side MOSFETs and inductor current - enables high-efficiency step-down operation. |
| TG2, BG2, SW2, BST2, VOUT | Boost-side power stage interface | Drive and sense the boost-side MOSFETs and output rail - enables step-up and buck-boost transitions. |
| ISP, ISN, ISMON | Input/output current monitor | Provide Kelvin-sense input/output current measurement with 10× gain + 0.25V offset for accurate system-level power management. |
| FB, VC, CTRL, SS, RT, SYNC/SPRD | Control and configuration | Enable closed-loop voltage regulation (FB), current limit programming (CTRL), soft-start timing (SS), frequency setting (RT), and EMI reduction (SYNC/SPRD). |
| LOADEN, LOADTG | High-side PMOS load switch control | Enable/disable external high-side PMOS FET with buffered inverted drive - isolates output during shutdown or fault. |
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 transition | Zero-audible-noise, low-EMI transitions between buck/buck-boost/boost modes - avoids output glitches during VIN drift (e.g., battery discharge). |
| Integrated bootstrap diodes | Removes two external Schottky diodes per side - simplifies layout, improves reliability, and reduces component cost. |
| Spread spectrum modulation | ±15% triangle dither around switching frequency - lowers peak EMI by >10dB without altering filter design. |
| AEC-Q100 Grade H | Qualified to –40°C to +150°C junction temperature - meets automotive reliability requirements for engine control and ADAS power supplies. |
Applications
| Automotive Battery Management | Industrial Telecom Power |
|---|---|
Use Scenario: Regulating 12V/24V/48V battery systems across charge, hold, and discharge phases where input voltage varies from 6V to 56V while maintaining stable 12V or 48V output. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller managing bidirectional energy flow with input/output current monitoring and fault latching. Use Value: Enables single-converter solution for battery backup, cold-crank support, and supercapacitor charging - eliminating dual-converter redundancy and reducing thermal stress. | Use Scenario: Providing isolated 48V intermediate bus from variable 36–60V telecom rectifier input, powering PoE switches and remote radio units with tight ripple and fast transient response. IC Role / Device Role / Timing Role: High-efficiency (98%) voltage regulator with programmable switching frequency and spread spectrum for EMI compliance in dense rack-mounted equipment. Use Value: Delivers stable 48V at up to 4A with <±1.5% regulation accuracy and <10µs transient recovery - meeting GR-1089-CORE immunity requirements. |
| High-Power Portable Equipment | Automotive ADAS Power Supply |
Use Scenario: Powering FPGA-based edge AI modules from 2S–6S Li-ion packs (6V–25.2V), requiring 3.3V/5V/12V rails with dynamic load steps up to 3A. IC Role / Device Role / Timing Role: Primary buck-boost controller with soft-start, PGOOD flag, and input current limiting to prevent battery over-discharge during peak loads. Use Value: Maintains regulated output across full battery SOC without brownouts - extends runtime and eliminates need for secondary LDOs or post-regulators. | Use Scenario: Supplying 5V/3.3V rails to radar sensors and camera modules in engine bay, operating continuously at 125°C ambient with transient immunity to load dump and cold crank. IC Role / Device Role / Timing Role: AEC-Q100 Grade H controller with integrated 5V INTVCC LDO, 2V VREF, and thermal shutdown - enabling robust local power generation. Use Value: Eliminates external bias supply and reference ICs - reduces failure points and meets ISO 16750-2 pulse test requirements without derating. |
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 |
|---|---|---|---|
| LT8391HUFD#PBF | Includes integrated 5V/200mA boost converter for gate drive bias; same pinout and control features. | Reduces external components when BST1/BST2 bootstrap supplies require higher current or tighter regulation. | Select LT8391HUFD#PBF if bootstrap capacitor charging demands exceed LT8390's internal diode capability under heavy load. |
| MPQ4333HG-AEC1-Z | 3.5A integrated power stage; fixed 500kHz frequency; no ISP/ISN current monitor or spread spectrum. | Limited to lower-power (<25W) automotive applications; lacks precision current sensing and EMI optimization features. | Choose MPQ4333HG-AEC1-Z only for cost-sensitive, space-constrained designs where 4-switch flexibility and advanced monitoring are unnecessary. |
Compared with LT8391HUFD#PBF, the LT8390HUFD#PBF offers identical control architecture but requires external bootstrap capacitors, making it more flexible for high-current gate drive tuning. Against MPQ4333HG-AEC1-Z, LT8390HUFD#PBF delivers higher power scalability, precision current monitoring, and superior EMI performance - critical for >40W automotive and industrial systems.
Availability
LT8390HUFD#PBF is available at Aetrix Electronics and suitable for automotive battery management, industrial telecom power, and high-power portable equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8390HUFD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and automotive markets.
The LT8390 product line delivers high-voltage, high-efficiency 4-switch buck-boost controllers designed for automotive, industrial, and telecom applications where input voltage can vary above, below, or equal to the output voltage - enabling single-stage power conversion in dynamic power systems.
FAQ
What is the maximum continuous output current supported by the LT8390HUFD#PBF?
The LT8390HUFD#PBF itself does not set output current limits - it is a controller, not an integrated power stage. Maximum output current depends on external MOSFET selection, inductor rating, thermal design, and layout. In the typical 12V/4A application, efficiency reaches 98%, confirming support for ≥4A continuous output with appropriate external components and PCB copper area.
Does the LT8390HUFD#PBF support both input and output current regulation?
Yes, the LT8390HUFD#PBF supports both input and output current regulation via dedicated ISP/ISN pins for output current sensing and LSP/LSN pins for inductor (input-equivalent) current sensing. The CTRL pin allows programmable current limit thresholds from 5mV to 100mV, enabling precise constant-current battery charging or input current limiting.
How does the LT8390HUFD#PBF handle transitions between buck, buck-boost, and boost modes?
The LT8390HUFD#PBF uses a proprietary peak-buck/peak-boost current mode control scheme that automatically detects VIN/VOUT ratio and transitions between operation regions at precise thresholds - e.g., buck-boost to boost at VIN/VOUT = 0.75, buck to buck-boost at 1.18. These transitions are seamless, with no output voltage glitch or audible noise, verified across temperature and load conditions.
Can the LT8390HUFD#PBF be synchronized to an external clock?
Yes, the LT8390HUFD#PBF supports external synchronization via the SYNC/SPRD pin. When driven with a TTL/CMOS clock signal within 150kHz–650kHz, the internal oscillator locks to the external frequency - enabling deterministic EMI reduction and multi-phase interleaving in high-power systems.
What thermal performance can be expected from the LT8390HUFD#PBF in its QFN package?
The LT8390HUFD#PBF in the 28-lead QFN (4mm × 5mm) package has θJC = 3.4°C/W and θJA = 43°C/W with standard 2oz copper and 4 thermal vias under the exposed pad. At 4A/12V output with 400kHz switching, junction temperature rise remains <45°C above ambient under typical PCB conditions - well within its –40°C to +150°C operating range.
LT8390HUFD#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT8390HUFD#PBF FAQ
1.How can I place an order for LT8390HUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390HUFD#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 LT8390HUFD#PBF reliable?
The price and inventory of LT8390HUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390HUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT8390HUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390HUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390HUFD#PBF?
LT8390HUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390HUFD#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 LT8390HUFD#PBF?
For technical support, including LT8390HUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390HUFD#PBF requirements.
6.How does Aetrix verify that LT8390HUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8390HUFD#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 LT8390HUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT8390HUFD#PBF?
All LT8390HUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390HUFD#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 LT8390HUFD#PBF part is unused and in its original packaging.
Return procedure for LT8390HUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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