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Analog Devices Inc. LT8390AEUFD#TRPBF
- Part No.:
- LT8390AEUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390AEUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 28
- Quantity:
- Payment:
- Shipping:
Inventory:2,446
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Product details
Overview
LT8390AEUFD#TRPBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V–60V input and 0V–60V output, operating at up to 2MHz with ±1.5% VOUT accuracy and spread-spectrum EMI reduction. It enables seamless VIN-above/VIN-below/VIN-equal-to-VOUT regulation in automotive battery chargers, industrial power supplies, and telecom voltage regulators.
For engineers reviewing the LT8390AEUFD#TRPBF datasheet, LT8390AEUFD#TRPBF pinout, LT8390AEUFD#TRPBF application, or LT8390AEUFD#TRPBF equivalent, key selection criteria include its peak-buck/peak-boost current mode control, 28-pin QFN (4mm × 5mm) package with exposed thermal pad, AEC-Q100 qualification, and dual current sense monitoring for input/output current regulation.
Technical Context
The LT8390AEUFD#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current mode architecture with independent buck and boost region control logic, enabling smooth transitions across operation modes without audible noise or output disturbance. Its dual current sense inputs (ISP/ISN and LSP/LSN) support both output current regulation and inductor current sensing with ±3% accuracy.
It integrates two bootstrap drivers (BST1/BST2), four gate drivers (TG1/BG1/TG2/BG2), a 5V INTVCC LDO, and a 2V VREF reference. The SYNC/SPRD pin supports either external clock synchronization or internal 25% triangle spread-spectrum modulation to reduce conducted EMI peaks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range automotive battery (9–16V nominal), industrial 24V/48V rails, and supercapacitor backup systems. |
| Output Voltage Range | 0V to 60V - enables bidirectional voltage regulation including zero-VOUT shutdown and high-side load switch control. |
| Switching Frequency | 600kHz to 2MHz - adjustable via RT resistor; 2MHz operation allows compact magnetics and fast transient response. |
| VOUT Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation for precision analog supplies and ADC references. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables reliable battery charge/discharge current control and overcurrent protection. |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive and industrial ambient environments. |
| Package | 28-lead QFN (4mm × 5mm) with exposed GND pad - provides low θJA = 43°C/W for thermally constrained PCB layouts. |
Pinout & Package
The LT8390AEUFD#TRPBF is housed in a 28-lead plastic QFN (4mm × 5mm) with exposed thermal pad (Pin 29 = GND), optimized for high-power density and thermal performance in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage feedback input | Regulates output to 1.00V reference; enables CV/CC operation and fault detection (OV/UV). |
| ISP / ISN | Output current sense differential pair | Monitors output current with ±3% accuracy; supports programmable current limit via CTRL pin. |
| LSP / LSN | Inductor current sense differential pair | Provides peak-current-mode control signal for buck/boost/buck-boost region transitions. |
| TG1 / BG1 / TG2 / BG2 | N-channel MOSFET gate drivers | Four independent drivers with <25ns rise/fall times; supports high-frequency synchronous rectification. |
| BST1 / BST2 | Bootstrap supply pins | Integrated Schottky diodes feed external bootstrap capacitors; enable high-side NMOS drive above VIN/VOUT. |
| LOADEN / LOADTG | High-side PMOS load switch control | Enables/disables external PMOS; LOADTG swings from (VOUT–5V) to VOUT for robust gate drive. |
| SYNC/SPRD | Frequency control input | GND = fixed frequency; INTVCC = 25% spread spectrum; external clock = synchronization. |
| PGOOD | Open-drain power-good flag | Asserts when FB is within ±10% of target; requires external pull-up for system sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters; reduces BOM count and board area by >40% vs dual-stage solutions. |
| Seamless region transition | No output glitch or audible noise during VIN/VOUT crossover (e.g., 12V→13.8V automotive start-stop); avoids system reset or brownout. |
| Spread-spectrum EMI reduction | 25% triangle modulation lowers peak radiated emissions by up to 10dB, easing CISPR 25 Class 5 compliance. |
| AEC-Q100 Grade E | Qualified for automotive applications per Rev H stress testing; supports junction temperatures up to +125°C. |
| Programmable fault response | Hiccup, latch-off, or continuous operation during short-circuit - selected via SS pin resistor (no external logic required). |
Applications
| Automotive Battery Charger | Industrial 24V/48V Power Supply |
|---|---|
Use Scenario: Regulating 12V/24V battery voltage to charge 48V Li-ion packs in mild-hybrid vehicles. IC Role / Device Role / Timing Role: 4-switch buck-boost controller managing bidirectional power flow with precise current limiting and thermal foldback. Use Value: Enables single-stage 12V→48V charging at >95% efficiency @2MHz, eliminating bulky transformers and reducing thermal footprint. | Use Scenario: Providing regulated 24V output from unregulated 36–75V telecom rectifier input in industrial PLC modules. IC Role / Device Role / Timing Role: Wide-input buck-boost controller maintaining tight output regulation despite input transients and load steps. Use Value: Delivers ±1.5% VOUT accuracy across 4V–60V input range, ensuring stable I/O and communication circuit operation. |
| Supercapacitor Backup System | High-Frequency Portable Equipment |
Use Scenario: Bidirectional power management between 5V system rail and 2.7–5.5V supercapacitor bank in data logger UPS. IC Role / Device Role / Timing Role: Synchronous buck-boost controller regulating capacitor voltage during charge/discharge cycles with reverse-current blocking. Use Value: Supports zero-VOUT shutdown and seamless mode switching, extending backup runtime while preventing capacitor overvoltage. | Use Scenario: Compact 5V/3A power stage in portable medical monitor powered by 2S Li-ion (6–8.4V). IC Role / Device Role / Timing Role: 2MHz switching controller minimizing inductor size (<1µH) and enabling ultra-thin PCB stackup. Use Value: Achieves 95% efficiency at 2MHz with 4mm × 5mm QFN package, meeting stringent EMI and spatial constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#TRPBF | Fixed 300kHz–400kHz frequency; no spread spectrum; 55V max VIN; no ISP/ISN current monitor | Suitable for lower-frequency, non-automotive designs where EMI is less critical and current monitoring is not required | Select LTC3780EFE#TRPBF only if 2MHz operation, ±3% current accuracy, or AEC-Q100 qualification are unnecessary. |
| MPQ4332GR-A | Integrated MOSFETs (40V max); 500kHz–2.5MHz sync; no LSP/LSN sense; no spread spectrum; no AEC-Q100 rating | Targeted at cost-sensitive consumer power supplies with lower voltage requirements and relaxed reliability specs | Choose MPQ4332GR-A only for non-automotive, ≤40V applications where integrated FETs simplify layout but limit peak efficiency and thermal headroom. |
Compared with LTC3780EFE#TRPBF and MPQ4332GR-A, the LT8390AEUFD#TRPBF uniquely combines 2MHz operation, spread-spectrum EMI reduction, dual current sensing (ISP/ISN + LSP/LSN), and AEC-Q100 qualification - making it the only option for high-density, automotive-grade buck-boost regulation requiring precise current control and low-noise performance.
Availability
LT8390AEUFD#TRPBF is available at Aetrix Electronics and suitable for automotive battery management, industrial power conversion, and telecom voltage regulation requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8390AEUFD#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 LT8390A product line delivers high-efficiency, wide-input-range buck-boost controllers designed specifically for automotive battery charging, industrial power supplies, and telecom infrastructure where seamless mode transitions and low EMI are mandatory.
FAQ
What is the maximum switching frequency supported by the LT8390AEUFD#TRPBF?
The LT8390AEUFD#TRPBF supports an adjustable switching frequency from 600kHz to 2MHz, set via an external RT resistor. At RT = 59.0kΩ, it operates at up to 2MHz (typical), enabling compact magnetics and fast transient response in space-constrained designs.
Does the LT8390AEUFD#TRPBF support spread-spectrum frequency modulation?
Yes, the LT8390AEUFD#TRPBF supports internal 25% triangle spread-spectrum modulation when the SYNC/SPRD pin is tied to INTVCC. This feature reduces peak EMI emissions by spreading energy across a wider frequency band, aiding CISPR 25 Class 5 compliance.
What is the purpose of the LSP and LSN pins on the LT8390AEUFD#TRPBF?
The LSP and LSN pins on the LT8390AEUFD#TRPBF form a Kelvin-connected differential pair that senses inductor current for peak-current-mode control. They enable accurate regulation across buck, buck-boost, and boost regions and support reverse-current detection during mode transitions.
Is the LT8390AEUFD#TRPBF qualified for automotive applications?
Yes, the LT8390AEUFD#TRPBF is AEC-Q100 qualified (Grade E, –40°C to +125°C) and designed for automotive use cases including battery chargers, start-stop systems, and infotainment power supplies requiring high reliability and thermal robustness.
How does the LT8390AEUFD#TRPBF handle output short-circuit conditions?
The LT8390AEUFD#TRPBF offers three configurable fault responses to output short-circuit: hiccup mode (no SS resistor), latch-off (499kΩ to VREF), or continuous operation (100kΩ to VREF). This is implemented via the SS pin and requires no external logic or microcontroller intervention.
LT8390AEUFD#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:
- 645kHz ~ 2.1MHz
- 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)
LT8390AEUFD#TRPBF FAQ
1.How can I place an order for LT8390AEUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390AEUFD#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 LT8390AEUFD#TRPBF reliable?
The price and inventory of LT8390AEUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390AEUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390AEUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390AEUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390AEUFD#TRPBF?
LT8390AEUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390AEUFD#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 LT8390AEUFD#TRPBF?
For technical support, including LT8390AEUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390AEUFD#TRPBF requirements.
6.How does Aetrix verify that LT8390AEUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390AEUFD#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 LT8390AEUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390AEUFD#TRPBF?
All LT8390AEUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390AEUFD#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 LT8390AEUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT8390AEUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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