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Analog Devices Inc. LT8390JUFD#TRPBF
- Part No.:
- LT8390JUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390JUFD#TRPBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST CNT
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
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Product details
Overview
LT8390JUFD#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 Grade J (–40°C to +150°C) qualification for automotive voltage regulation and battery charging applications.
For engineers reviewing the LT8390JUFD#TRPBF datasheet, LT8390JUFD#TRPBF pinout, LT8390JUFD#TRPBF application, or LT8390JUFD#TRPBF equivalent, key selection criteria include VIN/VOUT region transition behavior, ISP/ISN current sense accuracy across temperature, spread-spectrum EMI reduction capability, and high-side PMOS load switch integration for system-level power sequencing control.
Technical Context
The LT8390JUFD#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor and dual current sense paths (LSP/LSN for buck-side inductor current, ISP/ISN for input/output current monitoring). It dynamically selects among 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 integrated 5V INTVCC LDO powers gate drivers and internal circuitry, while the 2V VREF output enables precise external resistor programming of current limits via CTRL. The SYNC/SPRD pin supports either external clock synchronization or ±15% triangle spread-spectrum modulation to reduce conducted EMI without requiring additional filtering components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide-input automotive and industrial supplies including cold-crank (4.5V) and load-dump (60V) transients. |
| VOUT Range | 0V to 60V - enables bidirectional voltage regulation for battery charging, supercapacitor balancing, and seamless buck/boost transitions. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation under varying load, line, and temperature conditions for precision power rails. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT resistor or external sync clock) - allows optimization of efficiency vs. size trade-offs in compact designs. |
| Current Sense Accuracy | ±3% for ISP/ISN input/output current monitoring - enables reliable CC/CV battery charging and overcurrent protection with minimal external calibration. |
| Operating Junction Temp | –40°C to +150°C (Grade J) - qualified per AEC-Q100 for under-hood automotive applications with guaranteed performance at full range. |
| Spread Spectrum | ±15% triangle modulation (via SYNC/SPRD = INTVCC) - reduces peak EMI by >10dB without altering layout or component count. |
Pinout & Package
LT8390JUFD#TRPBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (GND), θJA = 43°C/W, θJC = 3.4°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage feedback input | Regulates output to 1.00V reference; enables CV operation and FB-based fault detection (OV/UV). |
| ISP / ISN | Input/output current sense differential inputs | Supports bidirectional current monitoring with 10× gain ISMON output; Kelvin connection required for ±3% accuracy. |
| LSP / LSN | Buck-side inductor current sense differential inputs | Provides primary current mode control signal; enables peak-buck/peak-boost mode selection and reverse current detection. |
| TG1 / BG1 / BST1 / SW1 | Buck-side N-MOSFET gate drive network | Drives external high-side (TG1) and low-side (BG1) switches; BST1 supplies floating gate drive for TG1 via integrated Schottky diode. |
| TG2 / BG2 / BST2 / SW2 | Boost-side N-MOSFET gate drive network | Drives external high-side (TG2) and low-side (BG2) switches; BST2 supplies floating gate drive for TG2 via integrated Schottky diode. |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables external PMOS; LOADTG provides buffered, inverted gate drive referenced to VOUT (not GND). |
| SYNC/SPRD | Frequency control input | Ground = fixed frequency; INTVCC = ±15% spread spectrum; external clock = synchronization up to 650kHz. |
| RT | Oscillator timing resistor | Resistor from RT to GND sets nominal switching frequency (150–650kHz); internal 1.00V reference enables accurate calculation. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters; supports continuous VIN above/below/equal to VOUT with no discontinuity. |
| Proprietary peak-buck/peak-boost current mode | Enables smooth, low-noise transitions between operating regions using one current sense resistor and deterministic mode hysteresis. |
| Integrated bootstrap diodes (BST1/BST2) | Reduces BOM count and layout complexity; eliminates need for external bootstrap diodes in high-reliability automotive designs. |
| AEC-Q100 Grade J qualification | Validated for automotive under-hood use with guaranteed operation from –40°C to +150°C junction temperature. |
| High-side PMOS load switch driver (LOADTG) | Provides rail-to-rail gate drive referenced to VOUT, enabling controlled hot-swap and power sequencing without external level shifters. |
Applications
| Automotive Front-End Power Supply | Battery Management System (BMS) Charger |
|---|---|
Use Scenario: Regulating 12V battery-derived input to stable 5V/3.3V rails for ADAS ECUs during cold-crank (4.5V) and load-dump (60V) events. IC Role / Device Role / Timing Role: Primary buck-boost controller managing bidirectional power flow and maintaining regulated outputs across wide VIN transients. Use Value: Seamless buck-to-boost transition avoids output dropout; ±1.5% VOUT accuracy ensures MCU/Sensor stability; AEC-Q100 Grade J guarantees reliability at 150°C junction. | Use Scenario: Charging 48V lithium-ion traction battery packs from variable solar or DC-link sources with programmable constant-current/constant-voltage profiles. IC Role / Device Role / Timing Role: Bidirectional current-regulated controller using ISP/ISN sensing to enforce precise charge current and terminate at target voltage. Use Value: ±3% current sense accuracy enables tight CC/CV control; spread spectrum reduces EMI in sensitive battery monitoring circuits; 60V output capability supports multi-cell stacks. |
| Industrial 24V/48V Power Backup | Telecom Remote Radio Unit (RRU) |
Use Scenario: Maintaining uninterrupted 48V output from either AC/DC supply or supercapacitor bank during grid failure or brownout. IC Role / Device Role / Timing Role: Dual-input buck-boost controller coordinating main supply and energy storage with automatic switchover and seamless transition. Use Value: 0V–60V VOUT range accommodates supercapacitor discharge curve; LOADTG enables controlled turn-on of backup path; 98% peak efficiency minimizes thermal stress. | Use Scenario: Providing regulated 28V output to RF power amplifiers from fluctuating base station DC bus (36–60V) while meeting stringent EMI limits. IC Role / Device Role / Timing Role: High-efficiency, low-EMI buck-boost regulator with spread-spectrum modulation and fast transient response for dynamic RF load changes. Use Value: ±15% spread spectrum reduces peak radiated emissions by >10dB; 150kHz–650kHz frequency adjustability avoids critical band interference; 4V–60V VIN handles telecom bus variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous 4-switch buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8705IUFD#TRPBF | Wider 2.8V–80V VIN range; no integrated spread spectrum; requires external current sense amplifier for ISP/ISN monitoring. | Preferred for ultra-wide-input industrial systems where EMI is less constrained and higher VIN tolerance is needed. | Select when input exceeds 60V or spread spectrum is unnecessary; verify external current sense design for ±3% accuracy. |
| MPQ4420AGU-AEC1-P | 3.3V–65V VIN; 40V max VOUT; no ISP/ISN current monitor; no spread spectrum; QFN-20 package. | Suitable for cost-sensitive automotive body electronics where only CV regulation is required and VOUT ≤ 40V. | Choose for simpler, lower-pin-count applications lacking current monitoring or spread spectrum needs; confirm VOUT < 40V requirement. |
Compared with LT8390JUFD#TRPBF, LT8705IUFD#TRPBF offers higher VIN tolerance but lacks integrated spread spectrum and ISP/ISN monitoring, while MPQ4420AGU-AEC1-P provides AEC-Q100 compliance in smaller footprint but sacrifices bidirectional current sensing and EMI mitigation features essential for precision battery and telecom applications.
Availability
LT8390JUFD#TRPBF is available at Aetrix Electronics and suitable for automotive front-end power supplies, battery management system chargers, industrial 24V/48V backup systems, and telecom remote radio units requiring stable component supply with AEC-Q100 qualification and extended temperature support.
Supply support for LT8390JUFD#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 industrial, automotive, communications, and healthcare markets.
The LT8390 product line delivers high-efficiency, wide-input-range synchronous 4-switch buck-boost controllers designed specifically for automotive-grade power conversion, battery charging, and energy storage systems demanding seamless mode transitions and robust EMI performance.
FAQ
What is the maximum output voltage supported by the LT8390JUFD#TRPBF?
The LT8390JUFD#TRPBF supports an output voltage range of 0V to 60V. This capability enables its use in applications such as 48V battery charging, supercapacitor balancing, and wide-range industrial power supplies. The ±1.5% output voltage accuracy applies across the full 1V to 60V range, ensuring stable regulation regardless of operating point. Absolute maximum ratings limit VOUT to 60V to protect internal circuitry.
Does the LT8390JUFD#TRPBF support spread-spectrum frequency modulation?
Yes, the LT8390JUFD#TRPBF supports triangle spread-spectrum modulation with ±15% deviation around the nominal switching frequency when the SYNC/SPRD pin is tied to INTVCC. This feature reduces peak conducted and radiated EMI without requiring additional filtering components or layout changes. The modulation is internally generated and does not require external clock sources or configuration registers.
How does the LT8390JUFD#TRPBF handle transitions between buck, buck-boost, and boost operating regions?
The LT8390JUFD#TRPBF uses Analog Devices' proprietary peak-buck/peak-boost current mode control to manage seamless, low-noise transitions. It monitors the VIN/VOUT ratio and applies hysteresis (e.g., buck-boost to boost at VIN/VOUT = 0.73–0.77) to prevent chattering. Four distinct operating states are implemented in hardware, with automatic selection based on real-time conditions-no firmware or external supervision is required for stable cross-region operation.
What is the purpose of the LOADEN and LOADTG pins on the LT8390JUFD#TRPBF?
The LOADEN pin serves as an enable input for the integrated high-side PMOS load switch driver, while LOADTG provides the buffered, inverted gate drive signal referenced to VOUT. When LOADEN is asserted, LOADTG drives the external PMOS gate from (VOUT – 5V) to VOUT, enabling controlled hot-swap and power sequencing. This eliminates the need for discrete level-shifters and simplifies system-level power management in automotive and industrial applications.
Is the LT8390JUFD#TRPBF qualified for automotive applications?
Yes, the LT8390JUFD#TRPBF is AEC-Q100 qualified for automotive applications with Grade J temperature rating (–40°C to +150°C junction temperature). It undergoes rigorous stress testing including HTOL, TC, UHAST, and ESD per AEC-Q100 Rev H requirements. The part marking "J" in the suffix explicitly denotes this qualification, making it suitable for under-hood and safety-critical power conversion functions in modern vehicles.
LT8390JUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN 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-QFN (4x5)
LT8390JUFD#TRPBF FAQ
1.How can I place an order for LT8390JUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390JUFD#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 LT8390JUFD#TRPBF reliable?
The price and inventory of LT8390JUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390JUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390JUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390JUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390JUFD#TRPBF?
LT8390JUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390JUFD#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 LT8390JUFD#TRPBF?
For technical support, including LT8390JUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390JUFD#TRPBF requirements.
6.How does Aetrix verify that LT8390JUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390JUFD#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 LT8390JUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390JUFD#TRPBF?
All LT8390JUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390JUFD#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 LT8390JUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT8390JUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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