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Analog Devices Inc. LT8390JFE#TRPBF
- Part No.:
- LT8390JFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390JFE#TRPBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST CNT
- Quantity:
- Payment:
- Shipping:
Inventory:3,933
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Product details
Overview
LT8390JFE#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 AEC-Q100 qualification for automotive use in battery chargers and voltage regulators.
For engineers reviewing the LT8390JFE#TRPBF datasheet, LT8390JFE#TRPBF pinout, LT8390JFE#TRPBF application, or LT8390JFE#TRPBF equivalent, key selection criteria include its seamless buck/buck-boost/boost region transitions, spread spectrum EMI reduction, integrated bootstrap diodes, high-side PMOS load switch driver, and –40°C to 150°C junction temperature rating.
Technical Context
The LT8390JFE#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN), enabling smooth, low-noise transitions across VIN/VOUT ratios from 0.73 to 1.35. It supports both input and output current regulation via ISP/ISN sensing with ±3% accuracy.
Its dual gate driver architecture delivers 2.6Ω pull-up / 1.4Ω pull-down NMOS drive (TG1/TG2) and 3.2Ω pull-up / 1.2Ω pull-down PMOS drive (BG1/BG2), with precise timing controls including 60ns TG-off-to-BG-on delay and fixed duty cycles per region (e.g., 85% TG1 in buck-boost, 15% BG2 in buck-boost).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide-input systems including automotive cold-crank (4.5V) and industrial 48V rails. |
| VOUT Range | 0V to 60V - enables bidirectional voltage regulation for battery charging and supercapacitor management. |
| Output Accuracy | ±1.5% at 1V ≤ VOUT ≤ 60V - ensures stable feedback loop performance across full output range. |
| Switching Frequency | 150kHz–650kHz adjustable via RT pin - allows optimization of size, efficiency, and EMI for specific layout constraints. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables reliable input/output current limiting and telemetry in safety-critical applications. |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive and high-temp industrial environments. |
| Spread Spectrum | ±15% triangle modulation - reduces peak EMI by spreading energy across frequency band without external components. |
Pinout & Package
LT8390JFE#TRPBF is housed in a 28-lead plastic TSSOP package with exposed pad (θJA = 30°C/W, θJC = 5°C/W). The exposed pad (Pin 29) 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 with <20ns fall time. |
| TG1, TG2 | Buck/Boost top gate drivers | Drive N-channel MOSFETs from SWx to BSTx; support bootstrap operation with integrated Schottky diodes on BST1/BST2. |
| LSP/LSN | Buck-side inductor current sense inputs | Kelvin-connected inputs for accurate peak-buck current mode control and reverse current detection. |
| ISP/ISN | Input/output current sense inputs | Enable precise ±3% current regulation and monitor output with 10× gain + 0.25V offset on ISMON. |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables external PMOS; LOADTG provides buffered inverted drive referenced to VOUT. |
| SYNC/SPRD | Frequency control terminal | GND = fixed frequency; INTVCC = ±15% spread spectrum; external clock = synchronization up to 650kHz. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters; supports VIN above, below, or equal to VOUT with one magnetic component. |
| Proprietary peak-buck/peak-boost control | Ensures continuous conduction and seamless region transitions (buck → buck-boost → boost) without audible noise or output disturbance. |
| Integrated bootstrap diodes | Reduces BOM count and layout complexity by eliminating external bootstrap diodes for BST1/BST2 supplies. |
| VOUT-disconnect during shutdown | Isolates output from input when EN/UVLO < 0.3V - prevents backfeed and supports system-level power sequencing. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications requiring operation from –40°C to +150°C junction temperature with robust fault protection. |
Applications
| Automotive Voltage Regulator | Battery Charger System |
|---|---|
Use Scenario: 12V/24V vehicle electrical system powering infotainment, ADAS sensors, and body control modules under cold-crank (4.5V) and load-dump (60V) conditions. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller regulating stable 5V/3.3V rails independent of input transients. Use Value: Maintains regulated output during 4V–60V input swings with >94% efficiency at 4A, reducing thermal stress and enabling compact heatsink-free designs. | Use Scenario: Charging 12V lead-acid or 48V LiFePO₄ batteries from variable solar or alternator sources with input ranging from 8V to 56V. IC Role / Device Role / Timing Role: Constant-voltage/constant-current controller using ISP/ISN sensing and FB feedback to manage charge profile. Use Value: Achieves ±3% current accuracy and ±1.5% voltage accuracy over temperature, ensuring safe, repeatable battery cycling and longevity. |
| Industrial Telecom Power Supply | High-Power Portable Equipment |
Use Scenario: 48V intermediate bus conversion to 12V/5V for base station radios, optical line terminals, and PoE++ injectors operating in harsh ambient environments. IC Role / Device Role / Timing Role: Primary DC/DC controller with spread spectrum EMI reduction and thermal foldback protection. Use Value: Meets CISPR 22 Class B conducted/emission limits without added filtering; supports continuous 150°C junction operation with derated lifetime. | Use Scenario: Power management in portable test equipment, medical monitors, and ruggedized tablets requiring wide-input operation from 12V–36V batteries or AC adapters. IC Role / Device Role / Timing Role: Bidirectional voltage regulator supporting both battery discharge (boost) and USB-C PD input (buck-boost). Use Value: Enables single-stage conversion from 12V battery to 20V USB-PD sink with 98% peak efficiency, minimizing heat generation and extending runtime. |
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 |
|---|---|---|---|
| LT8391JFE#TRPBF | Same pinout, adds integrated 5V/200mA LDO for bias supply; identical control architecture and temp rating. | Reduces external INTVCC bypass requirement; better suited when local 5V rail not available. | Select LT8391JFE#TRPBF if board space or BOM count reduction is prioritized over minimal cost delta. |
| MPQ4333GJ-AEC1-Z | 3.5V–36V input, 0.8V–24V output; lower voltage range, no spread spectrum, QFN-20 package. | Targeted at entry-level automotive ADAS cameras; lacks ISP/ISN current monitoring and AEC-Q100 Grade 1 extended temp. | Choose MPQ4333GJ-AEC1-Z only for cost-sensitive, lower-power (<20W), non-extended-temp applications where full LT8390JFE#TRPBF feature set is unnecessary. |
Compared with LT8390JFE#TRPBF, LT8391JFE#TRPBF adds an integrated LDO but shares identical control, protection, and thermal specs, while MPQ4333GJ-AEC1-Z offers lower integration and narrower voltage range-making LT8390JFE#TRPBF the optimal choice for high-reliability, wide-input, current-monitoring–enabled designs.
Availability
LT8390JFE#TRPBF is available at Aetrix Electronics and suitable for automotive voltage regulation, battery charging systems, and industrial telecom power supplies requiring stable component supply with AEC-Q100 compliance and extended temperature support.
Supply support for LT8390JFE#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 precision instrumentation, industrial automation, communications, and automotive markets.
The LT8390 product line delivers high-efficiency, wide-input-range synchronous buck-boost controllers designed specifically for demanding automotive, industrial, and battery-powered applications requiring seamless mode transitions and robust fault protection.
FAQ
What is the maximum operating junction temperature for the LT8390JFE#TRPBF?
The LT8390JFE#TRPBF is rated for continuous operation up to +150°C junction temperature and is AEC-Q100 qualified for Grade 1 automotive applications. Its thermal protection activates above this threshold, and lifetime is derated above 125°C. The exposed pad (Pin 29) must be soldered to PCB ground to achieve specified θJA = 30°C/W and maintain reliability at full rating.
Does the LT8390JFE#TRPBF support both input and output current regulation?
Yes, the LT8390JFE#TRPBF supports precise input or output current regulation using the ISP/ISN pins, with ±3% accuracy over temperature. The CTRL pin allows programmable current limit thresholds from 5mV to 100mV, and ISMON provides a buffered 10× scaled voltage output plus 0.25V offset for external monitoring or master-slave paralleling.
How does spread spectrum operation work on the LT8390JFE#TRPBF?
When SYNC/SPRD is tied to INTVCC, the LT8390JFE#TRPBF applies ±15% triangle spread spectrum modulation around its internal oscillator frequency, reducing peak EMI without external components. This differs from fixed-frequency or externally synchronized modes and is confirmed in the Electrical Characteristics table under "Highest/Lowest Spread Spectrum" parameters.
Can the LT8390JFE#TRPBF operate with VIN equal to VOUT?
Yes, the LT8390JFE#TRPBF is explicitly designed for buck-boost operation where VIN equals VOUT, using its proprietary peak-buck/peak-boost current mode control to maintain regulation with seamless transitions. Typical application data shows stable 12V-out-from-12V-in operation at 400kHz with >96% efficiency and minimal output ripple.
What package and pin count does the LT8390JFE#TRPBF use?
The LT8390JFE#TRPBF uses a 28-lead plastic TSSOP package with exposed pad (Pin 29 = GND). It is not offered in QFN; that variant is designated LT8390JUFD#TRPBF. The TSSOP package provides accessible pins for prototyping and supports θJC = 5°C/W when the exposed pad is properly soldered to the PCB ground plane.
LT8390JFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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:
- 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-TSSOP-EP
LT8390JFE#TRPBF FAQ
1.How can I place an order for LT8390JFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390JFE#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 LT8390JFE#TRPBF reliable?
The price and inventory of LT8390JFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390JFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390JFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390JFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390JFE#TRPBF?
LT8390JFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390JFE#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 LT8390JFE#TRPBF?
For technical support, including LT8390JFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390JFE#TRPBF requirements.
6.How does Aetrix verify that LT8390JFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390JFE#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 LT8390JFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390JFE#TRPBF?
All LT8390JFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390JFE#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 LT8390JFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8390JFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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