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Analog Devices Inc. LT8392JUFD#PBF
- Part No.:
- LT8392JUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8392JUFD#PBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST LED
- Quantity:
- Payment:
- Shipping:
Inventory:102
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Product details
Overview
LT8392JUFD#PBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting input voltages from 3V to 60V and output voltages from 1V to 60V, with ±1.5% output voltage accuracy, 98% peak efficiency at 12V/8A, and integrated bootstrap diodes. It operates in buck, buck-boost, or boost mode depending on VIN/VOUT ratio and delivers seamless low-noise transitions between regions for automotive battery regulation and supercapacitor charging.
For engineers reviewing the LT8392JUFD#PBF datasheet, LT8392JUFD#PBF pinout, LT8392JUFD#PBF application, or LT8392JUFD#PBF equivalent, key selection considerations include its 150kHz–650kHz adjustable switching frequency, spread-spectrum EMI reduction, ±4% current sense accuracy, thermal grade (–40°C to 150°C), and QFN-28 (4mm × 5mm) package with exposed GND pad.
Technical Context
The LT8392JUFD#PBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN) and dual current comparators (A3/A4). Its operation dynamically selects between four 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.
It features dual gate drivers (TG1/BG1 and TG2/BG2) with 2.6Ω pull-up / 1.4Ω pull-down on NMOS top gates and 3.2Ω/1.2Ω on bottom gates, internal 5V INTVCC LDO (4.8–5.2V, 190mA limit), and 2V VREF output (±2% over temperature). The SS pin enables soft-start timing and configurable fault response (hiccup/latch-off/keep-running) during short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range automotive transients (3V startup, 60V load dump) without external pre-regulation |
| Output Voltage Range | 1V to 60V - enables single-controller solutions for battery charging (e.g., 12V, 24V, 48V systems) and industrial rails |
| Switching Frequency | 150kHz–650kHz (adjustable via RT) or ±15% triangle spread spectrum - balances efficiency, size, and EMI compliance |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation across full output range without trimming |
| Current Sense Accuracy | ±4% for ISP/ISN monitoring - enables precise input/output current limiting and telemetry in battery management |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments |
| Package | 28-Lead QFN (4mm × 5mm) with exposed GND pad - provides low θJC = 3.4°C/W for thermal reliability in high-power designs |
Pinout & Package
LT8392JUFD#PBF uses a 28-lead plastic QFN (4mm × 5mm) with exposed thermal pad (Pin 29 = GND), rated for –40°C to +150°C operating junction temperature and θJA = 43°C/W, θJC = 3.4°C/W. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 | Buck and boost switch nodes | Connect to external high-side and low-side MOSFETs; require low-inductance layout and ceramic bypassing |
| TG1, BG1, TG2, BG2 | NMOS gate drivers (top/bottom, buck/boost sides) | Drive external FETs with 2.6Ω/1.4Ω (TG) and 3.2Ω/1.2Ω (BG) on-resistance; support 60ns dead-time control |
| LSP, LSN | Kelvin inductor current sense inputs | Enable accurate peak-current mode control across all operating regions (buck/buck-boost/boost) |
| ISP, ISN | Kelvin input/output current sense inputs | Support programmable current limiting and monitoring with ±4% accuracy and CTRL-based threshold scaling |
| FB | Voltage feedback input | Regulates output to 1.00V reference (±1.5%) - connects to resistor divider from VOUT for precise CV control |
| PGOOD | Open-drain power-good flag | Asserts low when FB is within ±8% of target - requires external pull-up for system sequencing and fault reporting |
| SYNC/SPRD | Frequency control input | Ground = fixed frequency; INTVCC = ±15% spread spectrum; external clock = synchronization to system master |
| EN/UVLO | Enable and input UVLO input | 0.3V shutdown / 1.220V enable threshold with 2.5µA hysteresis current - enables programmable input undervoltage lockout |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost controllers - reduces BOM count and PCB area in bidirectional power systems |
| Proprietary peak-buck/peak-boost control | Ensures continuous conduction and smooth mode transitions without audible noise or output glitches during VIN/VOUT crossover |
| Integrated bootstrap Schottky diodes | Reduces external component count by eliminating discrete bootstrap diodes while maintaining reliable gate drive in buck/boost regions |
| Configurable short-circuit protection | SS pin resistor selection enables hiccup (no resistor), latch-off (499kΩ), or keep-running (100kΩ) behavior - matches system-level fault strategy |
| VOUT disconnected from VIN during shutdown | Prevents backfeed and leakage paths in powered-down subsystems - critical for automotive domain controllers and safety-critical modules |
Applications
| Automotive Battery Regulation | Industrial Supercapacitor Charger |
|---|---|
|
Use Scenario: Regulating 12V/24V battery rail in start-stop vehicles where input dips to 3V during cranking and surges to 60V during load dump. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller managing bidirectional energy flow and maintaining stable output despite extreme VIN transients. Use Value: Delivers 98% efficiency at 12V/8A and seamless buck-to-boost transition - avoids brownouts and extends battery life in ADAS ECUs. |
Use Scenario: Charging 48V supercapacitor banks from variable renewable sources (e.g., solar MPPT output ranging 15–60V). IC Role / Device Role / Timing Role: High-voltage, high-efficiency DC/DC controller regulating constant-current charge profile with precise ISP/ISN monitoring. Use Value: ±4% current sense accuracy and programmable CTRL-based thresholds enable tight CC/CV control - improves capacitor lifetime and charge cycle consistency. |
| Telecom 48V Backup Power | High-Frequency Portable Instrumentation |
|
Use Scenario: Maintaining uninterrupted 48V output from primary AC/DC supply or backup Li-ion battery (10–36V) in telecom base station power shelves. IC Role / Device Role / Timing Role: Wide-input buck-boost controller providing seamless switchover between mains and battery with minimal output ripple. Use Value: Spread-spectrum modulation (±15%) reduces conducted EMI - meets EN 55032 Class B without added filtering, saving board space and cost. |
Use Scenario: Powering portable test equipment requiring clean, regulated 5V/3.3V rails from single-cell or multi-cell Li-ion batteries (3–18V). IC Role / Device Role / Timing Role: Compact QFN-28 controller enabling high-frequency (≥500kHz) operation to minimize inductor size and improve transient response. Use Value: 4mm × 5mm QFN package with 3.4°C/W θJC allows >5W continuous power in thermally constrained handheld enclosures. |
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 |
|---|---|---|---|
| LTC3789EFE#PBF | Fixed 500kHz frequency only; no spread spectrum; lower max VIN (40V); TSSOP-28 only | Lacks EMI mitigation and automotive-grade temp range; suitable for cost-sensitive non-automotive 12V/24V systems | Select if spread spectrum and 60V input are not required; verify thermal performance in QFN vs TSSOP |
| MPQ4333GQ-AEC1-Z | Integrated MOSFETs (60V/5A); smaller solution size but lower power capability; AEC-Q100 Grade 1 (–40°C to 125°C) | Not pin-compatible; limited to ≤60W; lacks ISP/ISN current monitor and programmable fault modes | Choose for space-constrained automotive modules needing integrated FETs - not for >60W or precision current telemetry |
Compared with LTC3789EFE#PBF and MPQ4333GQ-AEC1-Z, the LT8392JUFD#PBF uniquely combines 60V input, 150–650kHz adjustability, ±15% spread spectrum, and –40°C to 150°C operation - making it the only option qualified for high-power, high-EMI, high-temperature automotive and industrial buck-boost regulation.
Availability
LT8392JUFD#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial supercapacitor charging, and telecom 48V backup power systems requiring stable component supply, long-term lifecycle support, and guaranteed high-temperature performance.
Supply support for LT8392JUFD#PBF 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 LT8392 product line delivers high-efficiency, wide-input-range synchronous buck-boost controllers for demanding power conversion applications where input voltage may fall below, exceed, or equal the output - especially in automotive and industrial environments with harsh thermal and electrical conditions.
FAQ
What is the maximum input voltage rating for the LT8392JUFD#PBF?
The LT8392JUFD#PBF has an absolute maximum input voltage rating of 60V on the VIN pin, and its operational input range is specified from 3V to 60V. This makes the LT8392JUFD#PBF suitable for automotive applications subject to load dump transients up to 60V, provided proper input filtering and clamping are implemented per design guidelines.
Does the LT8392JUFD#PBF support both constant-voltage and constant-current regulation?
Yes, the LT8392JUFD#PBF supports both modes: constant-voltage regulation via the FB pin (targeting 1.00V) and constant-current regulation via the ISP/ISN pins with threshold programmable through the CTRL pin. The LT8392JUFD#PBF's dual-loop architecture enables seamless transition between CV and CC operation - essential for battery charging and LED driver applications.
How does the LT8392JUFD#PBF achieve low EMI in sensitive systems?
The LT8392JUFD#PBF achieves low EMI through built-in triangle spread-spectrum frequency modulation (±15% around the set frequency) when the SYNC/SPRD pin is tied to INTVCC. This spreads switching energy across a wider bandwidth, reducing peak emissions - a feature confirmed in the LT8392JUFD#PBF datasheet and validated in typical application circuits meeting CISPR 25 Class 5 requirements.
What thermal performance can be expected from the LT8392JUFD#PBF in a 4mm × 5mm QFN package?
The LT8392JUFD#PBF in its 28-lead QFN package delivers θJC = 3.4°C/W and θJA = 43°C/W (with proper PCB copper pour). When mounted on a 4-layer board with 2-in² 2oz copper thermal pad connected to the exposed GND pad, the LT8392JUFD#PBF sustains >5W continuous power dissipation at 150°C junction temperature - verified in thermal characterization data for the J-grade variant.
Can the LT8392JUFD#PBF be synchronized to an external clock source?
Yes, the LT8392JUFD#PBF supports external synchronization via the SYNC/SPRD pin. When driven with a CMOS-level clock signal (150kHz–650kHz), the LT8392JUFD#PBF locks its internal oscillator to the external frequency - enabling deterministic timing in multi-rail power systems and reducing beat frequencies in densely packed PCB layouts.
LT8392JUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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)
LT8392JUFD#PBF FAQ
1.How can I place an order for LT8392JUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8392JUFD#PBF 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 LT8392JUFD#PBF reliable?
The price and inventory of LT8392JUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8392JUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT8392JUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8392JUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8392JUFD#PBF?
LT8392JUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8392JUFD#PBF 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 LT8392JUFD#PBF?
For technical support, including LT8392JUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8392JUFD#PBF requirements.
6.How does Aetrix verify that LT8392JUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8392JUFD#PBF 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 LT8392JUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT8392JUFD#PBF?
All LT8392JUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8392JUFD#PBF, 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 LT8392JUFD#PBF part is unused and in its original packaging.
Return procedure for LT8392JUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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