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Analog Devices Inc. LT8390JUFD#PBF
- Part No.:
- LT8390JUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390JUFD#PBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST CNT
- Quantity:
- Payment:
- Shipping:
Inventory:187
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Product details
Overview
LT8390JUFD#PBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V–60V input and 0V–60V output, ±1.5% output voltage accuracy (1V–60V), 150kHz–650kHz adjustable switching frequency, and AEC-Q100 Grade J (–40°C to +150°C) operation. It enables seamless buck/buck-boost/boost transitions in automotive battery management and industrial power supplies.
For engineers reviewing the LT8390JUFD#PBF datasheet, LT8390JUFD#PBF pinout, LT8390JUFD#PBF application, or LT8390JUFD#PBF equivalent, key selection criteria include VIN/VOUT crossover capability, spread-spectrum EMI reduction, integrated bootstrap diodes, high-side PMOS load switch driver, and current-mode control with ISP/ISN monitoring for precise input/output current regulation.
Technical Context
The LT8390JUFD#PBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor and dual current sense paths (LSP/LSN for inductor current, ISP/ISN for input/output current). It dynamically selects between four operating states-peak-buck in buck region, peak-buck in buck-boost region, peak-boost in buck-boost region, and peak-boost in boost region-based on real-time VIN/VOUT ratio with hysteresis to prevent mode chattering.
Its oscillator supports internal fixed-frequency operation (150–650 kHz via RT resistor), external synchronization (150–650 kHz), or ±15% triangle spread-spectrum modulation when SYNC/SPRD is tied to INTVCC. The integrated 5V INTVCC LDO powers gate drivers and internal circuitry, while the 2V VREF provides stable reference for external feedback dividers and CTRL programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide-input systems including 12V/24V/48V automotive and industrial rails. |
| VOUT Range | 0V to 60V - enables bidirectional voltage regulation across buck, buck-boost, and boost topologies without topology change. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures tight regulation for sensitive loads like microcontrollers and sensors. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables reliable input/output current limiting and battery charge/discharge control. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT) - balances efficiency, size, and EMI; supports spread spectrum for low-noise designs. |
| Operating Junction Temp | –40°C to +150°C (Grade J) - qualified per AEC-Q100 for under-hood automotive and high-temp industrial use. |
| Package | 28-Lead QFN (4mm × 5mm) with exposed pad - optimized thermal performance (θJC = 3.4°C/W) for high-power density layouts. |
Pinout & Package
LT8390JUFD#PBF uses a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND). The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| 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 buck and boost phases. |
| TG1, TG2 | Buck/Boost top gate drivers | Drive N-channel MOSFETs from SWx to BSTx; require external bootstrap capacitors for high-side operation. |
| LSP / LSN | Inductor current sense inputs | Kelvin-connected terminals for accurate inductor current measurement across RSENSE in all operating regions. |
| ISP / ISN | Input/output current sense inputs | Kelvin-connected terminals enabling precise input current limit (buck) or output current limit (boost) regulation. |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables the buffered inverted LOADTG output, allowing controlled disconnection of VOUT from downstream loads during shutdown. |
| SYNC/SPRD | Oscillator control | Ground = fixed frequency; INTVCC = ±15% spread spectrum; external clock = synchronization - critical for EMI-sensitive applications. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost ICs; reduces BOM count and board area while enabling continuous VIN/VOUT crossover. |
| Seamless buck/buck-boost/boost transition | No output disturbance or control loop instability at VIN ≈ VOUT; avoids discontinuous operation and improves system reliability. |
| Integrated bootstrap Schottky diodes | Reduces external component count by eliminating discrete bootstrap diodes for BST1/BST2, simplifying layout and improving startup robustness. |
| Spread-spectrum frequency modulation | ±15% triangular dithering lowers peak EMI by spreading energy across bandwidth - meets CISPR 25 Class 5 requirements without added shielding. |
| VOUT disconnection during shutdown | When EN/UVLO < 0.3V, TG1/TG2 turn off and BG1/BG2 turn on, isolating VIN from VOUT and preventing backfeed into powered-down subsystems. |
Applications
| Automotive Battery Management | Industrial Wide-Input Power Supply |
|---|---|
Use Scenario: Regulating 12V/24V/48V battery systems where input voltage varies widely due to alternator transients, cold cranking, or supercapacitor discharge. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller managing bidirectional power flow between battery and load with seamless mode transitions. Use Value: Maintains stable 12V output during 4V–60V input swings; ±1.5% VOUT accuracy ensures consistent MCU/peripheral operation across temperature and aging. | Use Scenario: Powering programmable logic controllers (PLCs) and I/O modules from unregulated industrial rails (e.g., 24V nominal with ±20% tolerance). IC Role / Device Role / Timing Role: Primary DC/DC controller delivering regulated 5V/12V/24V outputs with high efficiency and low EMI in noisy factory environments. Use Value: 98% peak efficiency at 48W reduces thermal stress; spread spectrum minimizes conducted emissions interfering with analog sensor signals. |
| Telecom 48V Backup System | High-Power Portable Equipment |
Use Scenario: Providing uninterrupted 48V output from lithium-ion or lead-acid backup batteries during AC mains failure in telecom base stations. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger and regulator controlling battery charge/discharge while maintaining system rail stability. Use Value: ISP/ISN current monitoring enables precise 0–60V output current limiting; AEC-Q100 Grade J rating ensures long-term reliability in sealed enclosures. | Use Scenario: Powering portable test equipment requiring stable 12V/5V rails from variable-input sources such as USB PD, solar panels, or multi-cell LiPo packs. IC Role / Device Role / Timing Role: Single-chip solution replacing cascaded buck+boost converters, reducing footprint and improving light-load efficiency. Use Value: 28-lead QFN package enables compact layout; 4µA shutdown current extends battery runtime in standby modes. |
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 |
|---|---|---|---|
| LT8391JUFD#PBF | Includes integrated 5V/200mA boost regulator for gate drive; same pinout and control features; higher quiescent current (2.8mA vs 2.1mA typical). | Preferred when external INTVCC supply is unavailable or when higher gate drive current is needed for large MOSFETs. | Select LT8391JUFD#PBF if bootstrap capacitor charging or high-side drive strength is insufficient with LT8390JUFD#PBF's internal LDO. |
| MPQ4333GJ-AEC1-Z | Monolithic 3.5A buck-boost converter (not controller); fixed 5V/12V/15V outputs; no ISP/ISN monitoring; lower VIN max (36V). | Suitable only for lower-power, fixed-output applications without current regulation or wide-VIN flexibility. | Choose MPQ4333GJ-AEC1-Z only for cost-sensitive, low-complexity designs where programmability and precision current sensing are unnecessary. |
Compared with LT8391JUFD#PBF and MPQ4333GJ-AEC1-Z, the LT8390JUFD#PBF offers unmatched flexibility in output voltage range (0–60V), precision current monitoring (±3%), and seamless mode transitions - making it optimal for high-reliability, programmable power architectures where design reuse and future-proofing matter.
Availability
LT8390JUFD#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, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for LT8390JUFD#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 LT8390 product line delivers high-efficiency, wide-VIN synchronous 4-switch buck-boost controllers designed for mission-critical power conversion where input voltage may fall below, exceed, or equal the output - especially in automotive and industrial environments demanding AEC-Q100 reliability and low EMI.
FAQ
What is the maximum input voltage rating for LT8390JUFD#PBF?
The absolute maximum input voltage rating for LT8390JUFD#PBF is 60V on the VIN pin. Operation beyond this voltage risks permanent damage. The device is specified to operate continuously from 4V to 60V input, with full performance guaranteed over the entire range at junction temperatures up to +150°C.
Does LT8390JUFD#PBF support spread-spectrum EMI reduction?
Yes, LT8390JUFD#PBF supports ±15% triangle spread-spectrum frequency modulation. When the SYNC/SPRD pin is tied to INTVCC, the internal oscillator dithers around its nominal frequency (set by RT), effectively spreading spectral energy and reducing peak EMI emissions - a key feature for meeting CISPR 25 Class 5 requirements in automotive applications.
How does LT8390JUFD#PBF handle transitions between buck, buck-boost, and boost modes?
LT8390JUFD#PBF uses proprietary peak-buck/peak-boost current mode control with hysteresis-based region detection. Based on real-time VIN/VOUT ratio, it automatically selects among four states - peak-buck (buck), peak-buck (buck-boost), peak-boost (buck-boost), and peak-boost (boost) - ensuring smooth, low-noise transitions without output disturbance or control loop instability.
What is the purpose of the ISP and ISN pins on LT8390JUFD#PBF?
The ISP and ISN pins on LT8390JUFD#PBF provide Kelvin-connected inputs for an external current sense resistor (RIS) placed in either the input or output path. They enable precise ±3% current monitoring and regulation - supporting input current limiting in buck mode or output current limiting in boost mode - critical for battery charge control and overload protection.
Is LT8390JUFD#PBF pin-compatible with other LT8390 variants?
Yes, LT8390JUFD#PBF shares identical pinout and functionality with all other LT8390 variants in the UFD (QFN) package, including LT8390EUFD#PBF, LT8390IUFD#PBF, and LT8390HUFD#PBF. Differences are limited to temperature grade (–40°C to +150°C for J/H grades) and AEC-Q100 qualification - no PCB redesign is required when upgrading within the UFD family.
LT8390JUFD#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:
- 150kHz ~ 650kHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT8390JUFD#PBF FAQ
1.How can I place an order for LT8390JUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390JUFD#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 LT8390JUFD#PBF reliable?
The price and inventory of LT8390JUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390JUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT8390JUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390JUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390JUFD#PBF?
LT8390JUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390JUFD#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 LT8390JUFD#PBF?
For technical support, including LT8390JUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390JUFD#PBF requirements.
6.How does Aetrix verify that LT8390JUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8390JUFD#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 LT8390JUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT8390JUFD#PBF?
All LT8390JUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390JUFD#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 LT8390JUFD#PBF part is unused and in its original packaging.
Return procedure for LT8390JUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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