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Analog Devices Inc. LT8392JFE#TRPBF
- Part No.:
- LT8392JFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8392JFE#TRPBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST LED
- Quantity:
- Payment:
- Shipping:
Inventory:2,917
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Product details
Overview
LT8392JFE#TRPBF 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% VOUT accuracy, 98% peak efficiency at 12V/8A, and seamless mode transitions across buck/buck-boost/boost regions-used in automotive voltage regulators and battery charger systems.
For engineers reviewing the LT8392JFE#TRPBF datasheet, LT8392JFE#TRPBF pinout, LT8392JFE#TRPBF application, or LT8392JFE#TRPBF equivalent, key selection criteria include its 150kHz–650kHz adjustable switching frequency, integrated bootstrap diodes, spread-spectrum EMI reduction, and –40°C to +150°C junction temperature rating for under-hood automotive power conversion.
Technical Context
The LT8392JFE#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current-mode control architecture, using a single inductor current sense resistor (LSP/LSN) and dual error amplifiers (EA1/EA2) to regulate either output voltage (FB loop) or input/output current (ISP/ISN loop) across all operating regions. Its mode logic dynamically selects between four distinct switch states based on VIN/VOUT ratio.
It features dual independent gate drivers (TG1/BG1 and TG2/BG2), internal 5V INTVCC LDO powered from VIN or EXTVCC, 2V VREF reference, and programmable fault responses (hiccup/latch-off/keep-running) via SS pin resistor configuration-enabling robust operation in transient-heavy industrial and automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 60V - supports wide-input automotive (cold-crank to load-dump) and industrial supply rails without external pre-regulation. |
| VOUT Range | 1V to 60V - enables single-controller solutions for battery charging (12V/24V/48V), LED drivers, and programmable supplies. |
| Switching Frequency | 150kHz–650kHz (adjustable via RT) or ±15% triangle spread spectrum - reduces EMI peaks while maintaining predictable thermal behavior. |
| Output Voltage Accuracy | ±1.5% over –40°C to +150°C - ensures stable regulation in high-temp under-hood applications without calibration. |
| Current Sense Accuracy | ±4% for ISP/ISN monitoring - enables precise input or output current limiting in battery charge/discharge protection circuits. |
| Efficiency | 98% at 12V/8A (96W) - minimizes thermal stress and heatsink requirements in space-constrained automotive modules. |
| Junction Temp Range | –40°C to +150°C - qualified for AEC-Q100 Grade 1 automotive applications and extended industrial environments. |
Pinout & Package
LT8392JFE#TRPBF is housed in a 28-lead plastic TSSOP package with exposed pad (pin 29 = GND), θJA = 30°C/W, θJC = 5°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1, BG2 | Buck/Boost bottom gate drives | Drive N-channel MOSFET sources to GND; enable synchronous rectification with <1.2Ω pull-down resistance. |
| TG1, TG2 | Buck/Boost top gate drives | Drive N-channel MOSFET gates from SWx to BSTx; support bootstrap operation with integrated Schottky diodes on BST1/BST2. |
| LSP/LSN | Buck-side inductor current sense inputs | Kelvin-connected inputs for accurate peak-buck current sensing and reverse-current detection in buck/buck-boost modes. |
| ISP/ISN | Input/output current sense inputs | Kelvin-connected inputs for ±4% accurate current regulation or monitoring, independent of operating region. |
| FB | Voltage feedback input | Regulates VOUT to 1.00V reference; triggers PGOOD when within ±8% and initiates fault response if VFB < 0.25V (short). |
| SYNC/SPRD | Frequency control | GND = fixed frequency; INTVCC = ±15% spread spectrum; external clock = synchronization - no external components needed for EMI reduction. |
| EN/UVLO | Enable & input UVLO | 0.3V shutdown / 1.220V enable threshold with 2.5µA hysteresis current - allows precise VIN-based undervoltage lockout programming. |
| PGOOD | Open-drain status flag | Pulled low when FB is within ±8% of target - provides system-level power-good signaling for microcontroller sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor topology | Enables continuous conduction across VIN > VOUT, VIN ≈ VOUT, and VIN < VOUT - eliminates need for separate buck/boost controllers or complex power sequencing. |
| Proprietary peak-buck/peak-boost control | Uses single RSENSE and dual comparators to maintain smooth transitions between operating regions without audible noise or output glitches. |
| Integrated bootstrap diodes | Eliminates two external Schottky diodes per channel - reduces BOM count, layout area, and reliability risk in high-vibration automotive applications. |
| Programmable short-circuit response | SS pin resistor sets hiccup (no resistor), latch-off (499kΩ), or keep-running (100kΩ) behavior - enables application-specific fault handling without firmware. |
| VOUT disconnected from VIN during shutdown | Prevents backfeed from output to input rail - critical for battery-powered systems where load isolation preserves standby current. |
Applications
| Automotive Front-End Voltage Regulator | 12V/48V Dual-Battery Charger |
|---|---|
|
Use Scenario: Regulating unregulated vehicle battery (5V–60V) to stable 12V for infotainment, ADAS, and body control modules during cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Primary buck-boost controller managing power flow, mode transitions, and fault recovery without external supervision. Use Value: Maintains 12V output within ±1.5% across full temperature range and input extremes, enabling direct replacement of legacy discrete solutions with reduced component count. |
Use Scenario: Charging a 48V mild-hybrid battery from a 12V starter battery while simultaneously powering 12V loads during engine start-stop cycles. IC Role / Device Role / Timing Role: Bidirectional current-controlled regulator enforcing precise charge current limits and preventing reverse current during regenerative braking. Use Value: Achieves 98% efficiency at 8A output and ±4% current accuracy, minimizing heat generation and extending battery life in thermally constrained engine bays. |
| Industrial Telecom Power Supply | High-Frequency Portable Equipment Supply |
|
Use Scenario: Providing isolated 48V PoE++ power from wide-range 24V–60V industrial DC bus, with tight regulation and fast transient response to data traffic bursts. IC Role / Device Role / Timing Role: Constant-voltage controller with PGOOD signaling and spread-spectrum EMI suppression to meet EN55032 Class B emissions limits. Use Value: Delivers 96W at 48V with <15% EMI reduction versus fixed-frequency operation, eliminating costly shielding and filter components. |
Use Scenario: Powering portable test equipment requiring 5V/3A from a single-cell Li-ion (2.7V–4.2V) or two-cell pack (5.4V–8.4V) with minimal board area. IC Role / Device Role / Timing Role: Adaptive buck-boost controller selecting optimal mode (buck, buck-boost, or boost) in real time based on battery voltage decay. Use Value: Enables >95% efficiency across full battery discharge curve without manual reconfiguration or multiple converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8705EFE#TRPBF | Fixed 150kHz–600kHz sync capability; no spread spectrum; lower max VIN (80V vs 60V); same 28-TSSOP package. | Targeted at higher-power (>100W), non-automotive industrial supplies where EMI is less critical than absolute power density. | Select LT8705EFE#TRPBF when needing higher input voltage headroom and simpler frequency synchronization without EMI optimization. |
| MPQ4332GR-AEC1 | AEC-Q100 Grade 1; 4.5V–60V input; 0.8V–30V output; integrated MOSFETs; lower max current (3.5A vs 8A); QFN-24 package. | Used in cost-sensitive, lower-power automotive subsystems (e.g., HVAC, lighting) where integration outweighs flexibility. | Select MPQ4332GR-AEC1 only for compact, lower-current designs where integrated FETs reduce layout complexity and thermal management overhead. |
Compared with LT8392JFE#TRPBF, LT8705EFE#TRPBF offers wider input range but lacks spread-spectrum EMI reduction, while MPQ4332GR-AEC1 integrates power stages but sacrifices output voltage flexibility and current capability-making LT8392JFE#TRPBF optimal for high-efficiency, high-accuracy, high-temperature automotive and industrial buck-boost regulation.
Availability
LT8392JFE#TRPBF is available at Aetrix Electronics and suitable for automotive front-end regulators, 12V/48V dual-battery chargers, and industrial telecom power supplies requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for LT8392JFE#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 automotive, industrial, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LT8392 belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive and industrial applications requiring wide input/output ranges, high temperature operation, and ultra-low EMI.
FAQ
What is the maximum junction temperature rating for LT8392JFE#TRPBF?
The LT8392JFE#TRPBF is rated for operation from –40°C to +150°C junction temperature, meeting AEC-Q100 Grade 1 automotive qualification requirements. This rating is confirmed in the Absolute Maximum Ratings table and applies across the full operating range, enabling use in under-hood environments without derating below 125°C.
Does LT8392JFE#TRPBF support both constant-voltage and constant-current regulation?
Yes, the LT8392JFE#TRPBF supports both modes: constant-voltage regulation via the FB pin (targeting 1.00V), and constant-current regulation via the ISP/ISN pins with programmable threshold using the CTRL pin. The device automatically transitions between modes based on load conditions and control loop demands.
How does LT8392JFE#TRPBF implement spread-spectrum modulation?
The LT8392JFE#TRPBF implements ±15% triangle spread-spectrum modulation when the SYNC/SPRD pin is tied to INTVCC. This modulates the internal oscillator frequency around its center value (set by RT), reducing EMI peak amplitudes without requiring external clock sources or complex configuration.
What is the purpose of the TEST and TRIM pins on LT8392JFE#TRPBF?
On the LT8392JFE#TRPBF, the TEST pin must be connected directly to GND for normal operation and is reserved for factory testing; the TRIM pin must be connected directly to VREF and is used exclusively for internal factory trimming. Leaving either pin unconnected or misconfigured will prevent proper device startup.
Can LT8392JFE#TRPBF operate with only VIN powering INTVCC, or is EXTVCC required?
The LT8392JFE#TRPBF can operate with INTVCC powered solely from VIN - EXTVCC is optional and used only to improve efficiency when VIN is high (e.g., >24V). When EXTVCC is unused, it must be tied to GND. The internal LDO intelligently selects the lower-loss supply source.
LT8392JFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LT8392JFE#TRPBF FAQ
1.How can I place an order for LT8392JFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8392JFE#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 LT8392JFE#TRPBF reliable?
The price and inventory of LT8392JFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8392JFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8392JFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8392JFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8392JFE#TRPBF?
LT8392JFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8392JFE#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 LT8392JFE#TRPBF?
For technical support, including LT8392JFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8392JFE#TRPBF requirements.
6.How does Aetrix verify that LT8392JFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8392JFE#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 LT8392JFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8392JFE#TRPBF?
All LT8392JFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8392JFE#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 LT8392JFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8392JFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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