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Analog Devices Inc. LT8392JFE#PBF
- Part No.:
- LT8392JFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8392JFE#PBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST LED
- Quantity:
- Payment:
- Shipping:
Inventory:2,821
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Product details
Overview
LT8392JFE#PBF 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 operates across buck, buck-boost, and boost regions with seamless transitions-ideal for automotive voltage regulators and battery/supercapacitor chargers requiring wide VIN/VOUT flexibility.
For engineers reviewing the LT8392JFE#PBF datasheet, LT8392JFE#PBF pinout, LT8392JFE#PBF application, or LT8392JFE#PBF equivalent, key selection criteria include junction temperature rating (–40°C to 150°C), 28-lead TSSOP package with exposed GND pad, peak-buck/peak-boost current mode control, and dual ISP/ISN current sensing for CV/CC regulation in high-reliability power systems.
Technical Context
The LT8392JFE#PBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN) and separate ISP/ISN inputs for input/output current regulation. Its four-state operation-(1) peak-buck in buck region, (2) peak-buck in buck-boost, (3) peak-boost in buck-boost, and (4) peak-boost in boost region-enables smooth mode transitions without audible noise or regulation glitches.
It integrates dual bootstrap drivers (BST1/BST2) with internal Schottky diodes, 5V INTVCC LDO (4.8–5.2V, 190mA limit), 2V VREF output, and programmable fault responses (hiccup/latch-off/keep-running) via SS pin resistor configuration. Spread spectrum modulation (±15% triangle) is enabled by tying SYNC/SPRD to INTVCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 60V - supports cold-crank (3V) and load-dump (60V) conditions in automotive systems |
| VOUT Range | 1V to 60V - enables single-controller solutions for 5V, 12V, 24V, and 48V rails |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation across temperature and line/load variations |
| Current Sense Accuracy | ±4% for ISP/ISN monitoring - enables precise input or output current limiting in battery charging |
| Switching Frequency | 150kHz–650kHz adjustable via RT resistor; ±15% spread spectrum when SYNC/SPRD = INTVCC - reduces EMI peak emissions |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive and industrial high-temp environments |
| Package | 28-lead TSSOP with exposed thermal pad - θJC = 5°C/W enables high-power dissipation without heatsink |
Pinout & Package
LT8392JFE#PBF is housed in a 28-lead plastic TSSOP package with exposed GND pad (Pin 29), requiring soldering to PCB for thermal and electrical integrity. θJA = 30°C/W, θJC = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1, BG2 | Buck/Boost bottom gate drivers | Drive N-MOSFET sources to GND; 3.2Ω pull-up / 1.2Ω pull-down at INTVCC = 5V |
| TG1, TG2 | Buck/Boost top gate drivers | Drive N-MOSFET gates from SWx to BSTx; 2.6Ω pull-up / 1.4Ω pull-down at BST–SW = 5V |
| LSP/LSN | Buck-side inductor current sense | Kelvin-connected inputs for accurate peak-current mode control in all operating regions |
| ISP/ISN | Input/output current monitor sense | Supports CV or CC regulation; full-scale threshold programmable from 0–50mV via CTRL pin |
| FB | Voltage feedback input | Regulates VOUT to 1.00V reference; ±8% PGOOD window and short-circuit protection at 0.25V |
| SYNC/SPRD | Frequency control | Ground = fixed frequency; INTVCC = ±15% triangle spread spectrum; external clock = synchronization |
| GND (Pin 29) | Power and signal ground | Exposed thermal pad must be soldered to PCB ground plane for thermal management and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Enables continuous conduction across VIN < VOUT, VIN = VOUT, and VIN > VOUT - eliminates need for multiple converters |
| Proprietary peak-buck/peak-boost control | Single LSP/LSN resistor provides unified current sensing across all three operating regions with hysteresis to prevent mode chatter |
| Integrated bootstrap diodes | Eliminates external Schottky diodes on BST1/BST2 - reduces BOM count and layout area while maintaining >98% efficiency |
| Programmable fault response | SS pin resistor selects hiccup (no resistor), latch-off (499kΩ), or keep-running (100kΩ) during output short-circuit - configurable per system safety requirements |
| Dual current monitoring | Independent ISP/ISN and LSP/LSN paths allow simultaneous input current limiting and output current regulation - critical for battery charge termination |
Applications
| Automotive Voltage Regulation | Battery Charging System |
|---|---|
|
Use Scenario: Regulating 12V battery rail in vehicles with wide input transients (3V cold crank to 60V load dump). IC Role / Device Role / Timing Role: Primary buck-boost controller managing seamless transitions between buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT) modes. Use Value: Maintains stable 12V output without dropout or overvoltage during engine start-stop cycles and alternator transients. |
Use Scenario: Charging 24V LiFePO₄ battery pack from variable 12–48V source in off-grid solar or EV auxiliary systems. IC Role / Device Role / Timing Role: Constant-voltage/constant-current (CV/CC) controller using ISP/ISN for input current limit and FB for output voltage regulation. Use Value: Enables precise charge termination at 28.8V ±1.5% while limiting input current to protect upstream DC source. |
| Industrial Power Supply | Telecom 48V Backup System |
|
Use Scenario: Generating isolated 24V/5A output from unregulated 18–60V industrial bus with high reliability. IC Role / Device Role / Timing Role: High-efficiency (98%) buck-boost controller driving external MOSFETs with integrated gate drivers and thermal shutdown at 150°C. Use Value: Delivers full load across ambient temperatures up to 105°C without derating, supported by exposed-pad thermal design. |
Use Scenario: Maintaining 48V backup rail during AC mains failure using supercapacitor bank charged from 54V telecom rectifier. IC Role / Device Role / Timing Role: Bidirectional-capable controller regulating supercapacitor charge (boost mode) and discharge (buck mode) with reverse-current protection. Use Value: Seamless transition between charge/discharge avoids voltage interruption to powered equipment during switchover. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-switch buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AIFE#PBF | Same 28-TSSOP package, –40°C to 125°C rating; lacks spread spectrum and has lower 120kHz min frequency | Suitable for cost-sensitive industrial designs where EMI compliance is less stringent and temp range ≤125°C suffices | Select LT8390AIFE#PBF only if 150kHz–650kHz range and ±15% spread spectrum are not required |
| MPQ4332GR-A | Monolithic 3.5A solution in 16-QFN; no ISP/ISN current monitor, fixed 500kHz, max VIN = 36V | Targeted at space-constrained, lower-power applications where integrated FETs simplify layout but limit scalability | Choose MPQ4332GR-A for compact 12V→5V/3.3V conversion; avoid for >36V input or programmable CC charging |
Compared with LT8390AIFE#PBF and MPQ4332GR-A, the LT8392JFE#PBF uniquely combines automotive-grade 150°C operation, full 3–60V input support, ISP/ISN-based CV/CC regulation, and ±15% spread spectrum-making it the only option for high-reliability, wide-range, EMI-sensitive buck-boost applications.
Availability
LT8392JFE#PBF is available at Aetrix Electronics and suitable for automotive voltage regulation, battery/supercapacitor charging, and industrial power supply applications requiring stable component supply, extended temperature qualification, and long-term lifecycle support.
Supply support for LT8392JFE#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 precision instrumentation, industrial automation, communications, and automotive markets.
The LT8392 belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, designed specifically for robust, wide-input-range power conversion in harsh environments including automotive under-hood and industrial control systems.
FAQ
What is the maximum input voltage rating for the LT8392JFE#PBF?
The LT8392JFE#PBF has an absolute maximum VIN rating of 60V, with guaranteed operation from 3V to 60V. This allows direct connection to automotive batteries experiencing cold-crank (down to 3V) and load-dump transients (up to 60V), making the LT8392JFE#PBF suitable for ASIL-B compliant systems without external clamping.
How does the LT8392JFE#PBF achieve seamless transitions between buck, buck-boost, and boost modes?
The LT8392JFE#PBF uses a proprietary peak-buck/peak-boost current mode control scheme with hysteresis between operating regions. It senses inductor current via LSP/LSN and dynamically selects between buck logic and boost logic based on real-time VIN/VOUT ratio-ensuring zero-crossing stability and no output glitch during transitions, as verified in typical performance curves (Figures 2 and 3).
Can the LT8392JFE#PBF regulate both voltage and current simultaneously?
Yes-the LT8392JFE#PBF supports independent CV and CC regulation: FB pin regulates output voltage to 1.00V (±1.5%), while ISP/ISN inputs-controlled by the CTRL pin-regulate input or output current with ±4% accuracy. This dual-loop capability enables precise battery charging profiles where constant-current phase terminates at constant-voltage threshold, all managed within a single LT8392JFE#PBF device.
What thermal performance can be expected from the LT8392JFE#PBF in a 28-TSSOP package?
The LT8392JFE#PBF in 28-lead TSSOP achieves θJC = 5°C/W due to its exposed GND pad (Pin 29), enabling efficient heat transfer to the PCB. At 12V/8A (96W), junction temperature rise above ambient is ~40°C with 2-in² 2-oz copper pour-well within its –40°C to +150°C rated junction range. Derating begins above 125°C per Analog Devices' lifetime reliability guidelines.
Is spread spectrum EMI reduction enabled by default on the LT8392JFE#PBF?
No-spread spectrum is not enabled by default. To activate ±15% triangle spread spectrum on the LT8392JFE#PBF, the SYNC/SPRD pin must be tied to INTVCC. Leaving SYNC/SPRD floating or grounded disables spread spectrum and sets fixed-frequency operation (150–650kHz, set by RT). The feature is hardware-configurable with no software or register overhead.
LT8392JFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LT8392JFE#PBF FAQ
1.How can I place an order for LT8392JFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8392JFE#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 LT8392JFE#PBF reliable?
The price and inventory of LT8392JFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8392JFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8392JFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8392JFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8392JFE#PBF?
LT8392JFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8392JFE#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 LT8392JFE#PBF?
For technical support, including LT8392JFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8392JFE#PBF requirements.
6.How does Aetrix verify that LT8392JFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8392JFE#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 LT8392JFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8392JFE#PBF?
All LT8392JFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8392JFE#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 LT8392JFE#PBF part is unused and in its original packaging.
Return procedure for LT8392JFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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