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Analog Devices Inc. LT8392HUFD#TRPBF
- Part No.:
- LT8392HUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8392HUFD#TRPBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST LED
- Quantity:
- Payment:
- Shipping:
Inventory:1,687
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Product details
Overview
LT8392HUFD#TRPBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 3V–60V input and 1V–60V output, ±1.5% VOUT accuracy, 98% peak efficiency at 12V/8A, and spread-spectrum EMI reduction. It regulates voltage or input/output current in automotive battery systems, industrial power supplies, and telecom voltage regulators requiring seamless VIN-to-VOUT transitions.
For engineers reviewing the LT8392HUFD#TRPBF datasheet, LT8392HUFD#TRPBF pinout, LT8392HUFD#TRPBF application, or LT8392HUFD#TRPBF equivalent, key selection criteria include its peak-buck/peak-boost current mode control, 150kHz–650kHz adjustable switching frequency, integrated bootstrap diodes, and fault protection with programmable short-circuit response (hiccup/latch-off/keep-running).
Technical Context
The LT8392HUFD#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current mode architecture 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-buck, buck-boost (peak-buck), buck-boost (peak-boost), and boost-based on real-time VIN/VOUT ratio, with hysteresis to prevent mode chattering.
Its control loop integrates two error amplifiers (EA1 for voltage regulation, EA2 for current regulation), diode-OR'd VC output driving both buck (A3) and boost (A4) comparators, and slope compensation derived from the internal oscillator. The device supports EXTVCC biasing for improved efficiency and features an internal charge path to maintain BST1/BST2 bootstrap voltage during extended top-FET conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V (requires EXTVCC ≥ 4.5V below 4V VIN); enables operation across automotive cold-crank (4.5V) to load-dump (60V) transients. |
| Output Voltage Range | 1V to 60V with ±1.5% accuracy over temperature; supports wide-range battery charging (e.g., 12V–48V Li-ion stacks) and programmable system rails. |
| Switching Frequency | 150kHz to 650kHz fixed or ±15% triangle spread spectrum; allows EMI-sensitive designs to pass CISPR-25 Class 5 without shielding. |
| Current Sense Accuracy | ±4% for ISP/ISN monitoring; enables precise input current limiting in solar charge controllers or output current regulation in LED drivers. |
| Efficiency | 98% at 12V/8A (96W); achieved via low-RDS(on) gate drivers (TG1/TG2: 2.6Ω pull-up; BG1/BG2: 3.2Ω pull-up) and integrated bootstrap diodes reducing external component count. |
| Operating Temperature | –40°C to +150°C junction; qualified for under-hood automotive applications and high-ambient industrial environments. |
| Fault Protection | Programmable short-circuit response (hiccup/latch-off/keep-running via SS resistor); eliminates need for external fault logic in mission-critical power systems. |
Pinout & Package
LT8392HUFD#TRPBF uses a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (GND). The package provides θJA = 43°C/W and θJC = 3.4°C/W, enabling high-power density layouts in space-constrained automotive and industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1, BG2 | Buck/Boost bottom gate drives | Drive N-channel MOSFET gates from GND to INTVCC (5V); support synchronous rectification with <60ns dead-time control. |
| TG1, TG2 | Buck/Boost top gate drives | Drive N-channel MOSFET gates from SWx to BSTx; integrated bootstrap diodes reduce external BOM for high-side drive. |
| LSP/LSN | Inductor current sense inputs | Kelvin-connected inputs for accurate inductor current measurement in all operating regions (buck/buck-boost/boost). |
| ISP/ISN | Input/output current sense inputs | Enable bidirectional current regulation (e.g., battery charge/discharge) with 20× gain ISMON monitor output. |
| FB | Voltage feedback input | Regulates VOUT to 1.00V reference; ±0.2% line/load regulation enables stable CV operation across wide input ranges. |
| CTRL | Current limit programming | Accepts 0.25V–1.35V analog voltage to linearly set ISP/ISN current threshold from 0mV to 50mV full-scale. |
| SYNC/SPRD | Frequency control | GND = internal oscillator; INTVCC = ±15% spread spectrum; external clock = synchronization to system master clock. |
| PGOOD | Open-drain power-good flag | Asserts low when FB is within ±8% of target; enables sequencing with downstream rails or microcontroller fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor topology | Eliminates need for separate buck + boost converters; reduces solution size by >40% vs. dual-stage designs in 12V–48V telecom systems. |
| Seamless region transition | No output voltage glitch or control-loop instability during VIN crossing VOUT (e.g., automotive start-stop where battery dips from 13.5V to 6V). |
| Integrated bootstrap diodes | Removes two external Schottky diodes per channel; improves reliability and reduces layout complexity in high-vibration environments. |
| Programmable fault response | SS pin resistor sets short-circuit behavior: 0Ω = hiccup, 499kΩ = latch-off, 100kΩ = keep-running - no firmware or external logic required. |
| VOUT disconnected from VIN in shutdown | Prevents backfeed into input rail during system sleep; critical for battery-powered devices meeting IEC 62368-1 leakage requirements. |
Applications
| Automotive Battery Management | Industrial 24V/48V Power Supply |
|---|---|
|
Use Scenario: Regulating 12V battery output to stable 5V/3.3V for ADAS ECUs during cold-crank (4.5V) and load-dump (60V) events. IC Role / Device Role / Timing Role: 4-switch buck-boost controller maintaining constant output despite wide VIN swing; operates in buck region at 12V→5V, boost region at 6V→5V. Use Value: Eliminates need for pre-regulator + LDO cascade; achieves 96% efficiency at 5V/3A while passing ISO 7637-2 Pulse 4 and Pulse 5a. |
Use Scenario: Generating isolated 24V/48V rails from unregulated 36V–72V industrial bus in PLC backplanes. IC Role / Device Role / Timing Role: Primary non-isolated regulator controlling output voltage and input current limit; interfaces with downstream flyback/isolation stage. Use Value: ±4% ISP/ISN accuracy enables precise input current capping to meet EN 61000-3-2 harmonic limits; spread spectrum reduces conducted EMI at 150kHz fundamental. |
| Telecom 48V Backup System | High-Frequency Portable Charger |
|
Use Scenario: Charging supercapacitor banks from 48V telecom rectifier during mains failure, then discharging to 12V payload. IC Role / Device Role / Timing Role: Bidirectional current controller regulating charge current into supercap and discharge current to load; uses ISP/ISN for direction-aware sensing. Use Value: Seamless buck-boost transition prevents voltage droop during switchover; 150kHz–650kHz sync capability aligns switching with base station clock to avoid beat frequencies. |
Use Scenario: USB PD 3.1 programmable power supply (PPS) delivering 3.3V–21V at up to 5A from single-cell Li-ion (2.7V–4.5V). IC Role / Device Role / Timing Role: High-efficiency buck-boost controller with dynamic VOUT adjustment via DAC-driven FB divider; uses CTRL pin for adaptive current limiting. Use Value: 98% peak efficiency extends runtime; ±1.5% VOUT accuracy meets USB PD PPS ±20mV tolerance; QFN package enables compact 2-layer PCB design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8705IUFD#TRPBF | Wider 2.8V–80V input; no spread spectrum; requires external bootstrap diodes; 32-pin QFN. | Preferred for ultra-wide-input industrial systems (>60V) where EMI is less critical than input range. | Choose LT8705IUFD#TRPBF only if input exceeds 60V or spread spectrum is unnecessary; LT8392HUFD#TRPBF offers better EMI performance and lower BOM count. |
| MPQ4333GR-AEC1 | Automotive-grade 3.3V–60V input; fixed 350kHz frequency; no ISP/ISN current monitoring; 20-pin TSSOP. | Suitable for cost-sensitive automotive body electronics where only voltage regulation is needed. | Choose MPQ4333GR-AEC1 for basic CV applications without current regulation; LT8392HUFD#TRPBF is required for CC/CV battery charging or input current limiting. |
Compared with LT8705IUFD#TRPBF and MPQ4333GR-AEC1, the LT8392HUFD#TRPBF uniquely combines spread-spectrum EMI reduction, integrated bootstrap diodes, and dual-path current sensing (LSP/LSN + ISP/ISN) in a thermally optimized 4mm × 5mm QFN - making it the only choice for high-reliability, EMI-sensitive, bidirectional power conversion.
Availability
LT8392HUFD#TRPBF is available at Aetrix Electronics and suitable for automotive battery management, industrial 24V/48V power supplies, and telecom backup systems requiring stable component supply with guaranteed long-term availability.
Supply support for LT8392HUFD#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 precision instrumentation, industrial automation, and automotive markets since 1965.
The LT8392HUFD#TRPBF belongs to ADI's Power by Linear™ controller family, designed specifically for high-efficiency, wide-input-range DC/DC conversion in harsh environments where reliability, EMI compliance, and seamless mode transitions are critical.
FAQ
What is the maximum input voltage rating for the LT8392HUFD#TRPBF?
The LT8392HUFD#TRPBF has an absolute maximum VIN rating of 60V, with operational input range specified from 3V to 60V (requiring EXTVCC ≥ 4.5V for reliable startup below 4V). This makes the LT8392HUFD#TRPBF suitable for automotive applications experiencing load-dump transients up to 60V per ISO 7637-2, while maintaining regulation down to cold-crank voltages of 3V.
Does the LT8392HUFD#TRPBF support both constant-voltage and constant-current regulation?
Yes, the LT8392HUFD#TRPBF supports both modes: constant-voltage regulation via the FB pin (target 1.00V) and constant-current regulation via the ISP/ISN pins with programmable threshold using the CTRL pin. Its dual-error-amplifier architecture ensures smooth transitions between CV and CC operation - essential for battery charging applications where the LT8392HUFD#TRPBF manages both bulk charge (CC) and float charge (CV) phases.
How does the LT8392HUFD#TRPBF achieve low EMI in sensitive applications?
The LT8392HUFD#TRPBF reduces EMI through triangle spread-spectrum frequency modulation (±15% around the set frequency) when SYNC/SPRD is tied to INTVCC, plus inherent advantages of its 4-switch architecture that minimizes input/output ripple. Its ability to synchronize to an external clock (150kHz–650kHz) also allows timing alignment with system clocks to avoid beat frequencies - a key feature validated in CISPR-25 radiated emissions testing for the LT8392HUFD#TRPBF.
What thermal performance can be expected from the LT8392HUFD#TRPBF in a 4mm × 5mm QFN package?
The LT8392HUFD#TRPBF in its 28-lead 4mm × 5mm QFN package delivers θJA = 43°C/W and θJC = 3.4°C/W when the exposed pad is properly soldered to a 4-layer PCB with 2-in² copper pour. At 96W output (12V/8A), this enables junction temperatures ≤125°C with modest airflow - meeting AEC-Q100 Grade H (–40°C to +150°C) requirements without forced cooling in typical automotive under-hood deployments.
Can the LT8392HUFD#TRPBF operate with only VIN powering INTVCC, or is EXTVCC required?
The LT8392HUFD#TRPBF intelligently selects between VIN and EXTVCC to power its INTVCC LDO, improving efficiency. EXTVCC is optional: if unused, tie EXTVCC to GND. When present (0V–40V), the device automatically uses the higher-efficiency source - e.g., a local 5V rail - reducing power dissipation in the INTVCC LDO and enabling higher ambient operation. No external logic is needed for source selection in the LT8392HUFD#TRPBF.
LT8392HUFD#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:
- 2
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 60V
- Frequency - Switching:
- 400kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT8392HUFD#TRPBF FAQ
1.How can I place an order for LT8392HUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8392HUFD#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 LT8392HUFD#TRPBF reliable?
The price and inventory of LT8392HUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8392HUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8392HUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8392HUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8392HUFD#TRPBF?
LT8392HUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8392HUFD#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 LT8392HUFD#TRPBF?
For technical support, including LT8392HUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8392HUFD#TRPBF requirements.
6.How does Aetrix verify that LT8392HUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8392HUFD#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 LT8392HUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8392HUFD#TRPBF?
All LT8392HUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8392HUFD#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 LT8392HUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT8392HUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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