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Analog Devices Inc. LT8390IUFD#TRPBF
- Part No.:
- LT8390IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390IUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,181
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Product details
Overview
LT8390IUFD#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 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#TRPBF datasheet, LT8390IUFD#TRPBF pinout, LT8390IUFD#TRPBF application, or LT8390IUFD#TRPBF equivalent, key selection criteria include its peak-buck/peak-boost current mode control, integrated bootstrap diodes, high-side PMOS load switch driver (LOADTG), AEC-Q100 qualification, and QFN-28 (4mm × 5mm) package with exposed thermal pad.
Technical Context
The LT8390IUFD#TRPBF implements a proprietary dual-mode current sensing architecture using a single inductor current sense resistor (LSP/LSN) and separate ISP/ISN inputs for precise input/output current regulation. Its control logic dynamically selects between peak-buck and peak-boost modes based on real-time VIN/VOUT ratio - transitioning seamlessly at defined thresholds (e.g., buck-boost to boost at VIN/VOUT = 0.75).
It integrates two independent gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), internal 5V INTVCC LDO, 2V VREF reference, and fault management including PGOOD flag, FB overvoltage/short detection, and configurable short-circuit response (hiccup/latch-off/keep-running). The SYNC/SPRD pin enables either external clock synchronization or ±15% triangle spread-spectrum modulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range battery and industrial supply rails without pre-regulation. |
| Output Voltage Range | 0V to 60V - enables true buck-boost operation across all VIN/VOUT relationships. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT resistor or external sync) - balances efficiency, size, and EMI. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation for precision loads like sensors or ADC references. |
| Current Sense Accuracy | ±3% for input/output current monitoring (ISP/ISN) - enables accurate battery charge/discharge control. |
| Efficiency | Up to 98% at 12V/4A - minimizes thermal stress and improves power density in compact designs. |
| Operating Temp Range | –40°C to +125°C junction - qualified for under-hood automotive and industrial environments. |
| Package | 28-lead QFN (4mm × 5mm) with exposed thermal pad - provides low θJC = 3.4°C/W for reliable high-power operation. |
Pinout & Package
LT8390IUFD#TRPBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed GND pad (Pin 29), optimized for thermal performance (θJA = 43°C/W, θJC = 3.4°C/W). All pins are electrically validated per Analog Devices Rev. D datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Primary power input; determines buck/buck-boost/boost operating region; requires ≥1µF local ceramic bypass. |
| VOUT | Output supply rail | Regulated output node; serves as reference for LOADTG drive and defines boost-side operation boundary. |
| LSP / LSN | Buck-side inductor current sense | Kelvin-connected inputs for accurate inductor current measurement in all operating regions. |
| ISP / ISN | Input/output current sense | Dedicated high-accuracy current monitor path supporting bidirectional regulation (e.g., battery charging/discharging). |
| TG1 / BG1 / BST1 / SW1 | Buck-side NMOS gate drive | Drives external high-side (TG1) and low-side (BG1) NMOS; BST1 powers TG1 via integrated Schottky diode and external capacitor. |
| TG2 / BG2 / BST2 / SW2 | Boost-side NMOS gate drive | Drives external high-side (TG2) and low-side (BG2) NMOS; BST2 powers TG2 with same bootstrap architecture. |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables external PMOS; LOADTG provides buffered inverted gate drive referenced to VOUT. |
| FB / VC / RT / SYNC/SPRD | Voltage loop, error amp, freq setting, EMI control | FB sets output voltage (1.00V reference); VC compensates loop; RT sets oscillator; SYNC/SPRD selects sync or spread spectrum. |
| PGOOD / ISMON / EN/UVLO | Status, monitor, enable | PGOOD open-drain flag indicates regulation; ISMON outputs 10×(ISP−ISN)+0.25V; EN/UVLO enables device and programs input UVLO. |
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 applications. |
| Proprietary peak-buck/peak-boost current mode | Enables seamless, low-noise transitions between operating regions without output disturbance or control-loop instability. |
| Integrated bootstrap Schottky diodes | Removes requirement for external bootstrap diodes - simplifies layout, improves reliability, and reduces component count. |
| Spread-spectrum frequency modulation | Reduces peak EMI by ±15% triangular dithering - helps meet CISPR 25 Class 5 requirements without added filtering. |
| AEC-Q100 Grade I qualification | Validated for automotive applications including engine control units, ADAS power supplies, and infotainment systems. |
| Configurable fault protection | Supports hiccup, latch-off, or continuous operation during output short - selectable via SS pin resistor for system-level safety compliance. |
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 energy flow between battery and load with precise current limiting. Use Value: Maintains stable 12V output during 4V–60V input swings while enabling programmable charge current up to 6.7A with ±3% accuracy. |
Use Scenario: Powering industrial PLCs, motor drives, or field instruments from unregulated 24V–48V DC rails subject to line drops and surges. IC Role / Device Role / Timing Role: Primary voltage regulator delivering constant 5V/12V/15V output regardless of input variation, with soft-start and PGOOD sequencing. Use Value: Delivers up to 48W (12V/4A) at >98% efficiency and supports remote ON/OFF via LOADEN for system-level power gating. |
| Telecom Intermediate Bus Converter | High-Power Portable Equipment |
|
Use Scenario: Converting –48V telecom rectifier output to +12V intermediate bus for downstream POL converters in base station equipment. IC Role / Device Role / Timing Role: Isolated-capable buck-boost controller interfacing with transformerless topologies; supports synchronous rectification and current monitoring. Use Value: Achieves low EMI via spread spectrum and provides accurate ISP/ISN current reporting for system telemetry and fault logging. |
Use Scenario: Powering portable test equipment, medical handhelds, or ruggedized tablets with Li-ion/LiPo batteries (3.0V–4.2V/cell) and 12V peripherals. IC Role / Device Role / Timing Role: Bidirectional power manager regulating system rail from battery or external adapter, supporting USB PD or proprietary charging protocols. Use Value: Enables seamless transition between battery and adapter power with no output glitch, plus programmable current limits for safe fast-charging. |
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#TRPBF | Wider 2.8V–80V input range; no integrated spread spectrum; uses different current sense architecture (single ISP/ISN only). | Preferred for ultra-low-VIN applications (e.g., 3.3V backup rails); lacks seamless buck-boost region transition logic of LT8390. | Select LT8390IUFD#TRPBF when VIN/VOUT crossover behavior, low-EMI spread spectrum, or dual-path current sensing is required. |
| MPQ4333GR-AEC1 | Automotive-grade 4-switch buck-boost; fixed 400kHz frequency; no ISP/ISN current monitor; lower max input (40V). | Suitable for cost-sensitive automotive body electronics; lacks programmable fault response and VOUT-disconnect-on-shutdown capability. | Choose LT8390IUFD#TRPBF for designs needing output voltage accuracy better than ±2%, full 60V input support, or flexible short-circuit handling. |
Compared with LT8705IUFD#TRPBF and MPQ4333GR-AEC1, the LT8390IUFD#TRPBF uniquely combines AEC-Q100 qualification, ±1.5% VOUT accuracy, integrated spread spectrum, and dual-path current sensing - making it optimal for high-reliability automotive and industrial buck-boost regulation where precision, EMI, and fault robustness are critical.
Availability
LT8390IUFD#TRPBF is available at Aetrix Electronics and suitable for automotive battery management, industrial power supplies, and telecom intermediate bus converters requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8390IUFD#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8390IUFD#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC controllers, engineered specifically for demanding wide-input-voltage applications requiring seamless buck-boost operation, low EMI, and automotive-grade reliability.
FAQ
What is the maximum output current capability of the LT8390IUFD#TRPBF?
The LT8390IUFD#TRPBF itself does not deliver current directly but controls external MOSFETs. Its current sense circuitry supports up to 6.7A output current limit (based on 100mV full-scale ISP/ISN threshold and typical RSENSE values), enabling designs like the 48W (12V/4A) reference circuit. Actual output current depends on MOSFET selection, inductor rating, and thermal design - the LT8390IUFD#TRPBF provides precise regulation and protection up to this level.
Does the LT8390IUFD#TRPBF support both buck and boost operation simultaneously?
No - the LT8390IUFD#TRPBF operates in one of three distinct regions (buck, buck-boost, or boost) depending on the instantaneous VIN/VOUT ratio, but it never runs buck and boost stages concurrently. Its proprietary peak-buck/peak-boost control automatically selects the appropriate mode and ensures smooth, low-noise transitions between them - for example, shifting from buck-boost to boost when VIN/VOUT falls below 0.75.
How is spread-spectrum EMI reduction implemented in the LT8390IUFD#TRPBF?
The LT8390IUFD#TRPBF implements triangle spread-spectrum modulation by dithering its internal oscillator frequency ±15% around the nominal value set by the RT resistor or SYNC input. When SYNC/SPRD is tied to INTVCC, the device applies this modulation autonomously - reducing peak radiated emissions without requiring external components or sacrificing regulation accuracy or transient response.
Can the LT8390IUFD#TRPBF regulate input current instead of output voltage?
Yes - the LT8390IUFD#TRPBF supports true input current regulation via its ISP/ISN pins. By connecting a sense resistor in series with the input rail and feeding the differential voltage into ISP/ISN, the controller adjusts duty cycle to maintain a user-defined average input current (programmed via CTRL pin voltage), making it suitable for battery charge current limiting or input surge protection.
What is the purpose of the LOADTG pin on the LT8390IUFD#TRPBF?
The LOADTG pin on the LT8390IUFD#TRPBF is a buffered, inverted gate driver output referenced to VOUT, designed to control an external high-side PMOS transistor. When LOADEN is asserted high, LOADTG pulls low to turn on the PMOS, connecting VOUT to downstream loads; during shutdown or fault, LOADTG goes high to disconnect VOUT from the load - providing safe, controlled power sequencing and isolation.
LT8390IUFD#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:
- 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#TRPBF FAQ
1.How can I place an order for LT8390IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390IUFD#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 LT8390IUFD#TRPBF reliable?
The price and inventory of LT8390IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390IUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390IUFD#TRPBF?
LT8390IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390IUFD#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 LT8390IUFD#TRPBF?
For technical support, including LT8390IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390IUFD#TRPBF requirements.
6.How does Aetrix verify that LT8390IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390IUFD#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 LT8390IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390IUFD#TRPBF?
All LT8390IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390IUFD#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 LT8390IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT8390IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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