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Analog Devices Inc. LT8392EFE#TRPBF
- Part No.:
- LT8392EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8392EFE#TRPBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST LED
- Quantity:
- Payment:
- Shipping:
Inventory:4,894
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Product details
Overview
LT8392EFE#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% output voltage accuracy and up to 98% efficiency at 12V/8A. It employs proprietary peak-buck/peak-boost current mode control for seamless transitions between buck, buck-boost, and boost regions, and integrates bootstrap diodes for simplified gate drive. It is used in automotive voltage regulators and battery/supercapacitor chargers requiring wide VIN/VOUT flexibility.
For engineers reviewing the LT8392EFE#TRPBF datasheet, LT8392EFE#TRPBF pinout, LT8392EFE#TRPBF application, or LT8392EFE#TRPBF equivalent, key selection criteria include its 28-lead TSSOP package with exposed pad, spread spectrum EMI reduction, adjustable 150kHz–650kHz switching frequency, input/output current monitoring capability, and fault protection modes (retry/latch-off/keep-running) during short-circuit events.
Technical Context
The LT8392EFE#TRPBF implements a dual-path current-mode architecture with separate peak-buck and peak-boost comparators (A3 and A4), enabling smooth region transitions across VIN/VOUT ratios from 0.75 to 1.33. Its control logic dynamically selects between buck-only, buck-boost, and boost-only operation based on real-time voltage ratio and inductor current polarity.
It features two independent gate driver stages (TG1/BG1 for buck side; TG2/BG2 for boost side), each with integrated bootstrap diodes and matched 2.6Ω pull-up / 1.4Ω pull-down NMOS driver resistance. The VC error amplifier output serves as a unified threshold for both current comparators, ensuring coordinated CV/CC regulation without external compensation re-tuning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 60V - supports automotive cold-crank (3V) and load-dump (60V) transients without external protection. |
| VOUT Range | 1V to 60V - enables single-controller solutions for 5V, 12V, 24V, and 48V systems with programmable feedback divider. |
| Output Voltage Accuracy | ±1.5% over –40°C to 125°C - ensures stable regulation across automotive temperature extremes. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT resistor) - allows optimization of size vs. efficiency and EMI compliance. |
| Current Sense Accuracy | ±4% for ISP/ISN monitoring - enables precise input or output current limiting in battery charging applications. |
| Efficiency | Up to 98% at 12V/8A - reduces thermal stress and enables compact PCB layouts in high-power density designs. |
| Spread Spectrum | ±15% triangle modulation - lowers peak EMI by spreading energy across a 30% bandwidth, easing CISPR-25 Class 5 compliance. |
Pinout & Package
LT8392EFE#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 drivers | Drive N-channel MOSFET sources to GND; enable synchronous rectification and high-efficiency low-side switching. |
| TG1, TG2 | Buck/Boost top gate drivers | Drive N-channel MOSFET gates from SWx to BSTx; require external bootstrap capacitors for high-side floating bias. |
| LSP/LSN | Buck-side inductor current sense inputs | Kelvin-connected to RSENSE for accurate peak-current detection in all operating regions. |
| ISP/ISN | Input/output current sense inputs | Enable programmable current limit or monitor via CTRL pin; support CV/CC battery charging profiles. |
| FB | Voltage feedback input | Regulates VOUT to 1.00V reference; ±1.5% accuracy ensures tight output tolerance without trimming. |
| PGOOD | Open-drain power-good flag | Asserts low when FB is within ±8% of target - provides system-level power sequencing and fault indication. |
| SYNC/SPRD | Frequency sync or spread-spectrum enable | Tie to INTVCC for ±15% triangle spread spectrum; ground for fixed-frequency operation; accept external clock for synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck/buck-boost/boost transition | Eliminates output voltage glitches during VIN crossing VOUT - critical for automotive start-stop and battery backup systems. |
| Integrated bootstrap Schottky diodes | Reduces external component count by two diodes per channel; simplifies layout and improves reliability in high-vibration environments. |
| Programmable fault response | Configurable short-circuit behavior (hiccup, latch-off, or keep-running) via SS-to-VREF resistor - enables application-specific safety policies. |
| VOUT disconnected from VIN during shutdown | Prevents backfeed from output to input rail - essential for isolated power domains and hot-swap applications. |
| Input/output current monitor with ISMON | Provides 20×(VISP–VISN)+0.25V analog output - enables real-time telemetry and closed-loop current control without ADC overhead. |
Applications
| Automotive Start-Stop Regulator | Industrial 24V Supercapacitor Charger |
|---|---|
|
Use Scenario: Maintains stable 12V supply during engine cranking (VIN drops to 3V) and alternator overvoltage (VIN spikes to 60V). IC Role / Device Role / Timing Role: 4-switch buck-boost controller regulating VOUT = 12V while continuously adapting topology based on real-time VIN/VOUT ratio. Use Value: Eliminates need for separate buck + boost converters; achieves 98% efficiency at 8A load across full automotive voltage range. |
Use Scenario: Charges 24V supercapacitor bank from variable 12–48V industrial bus with constant-current then constant-voltage profile. IC Role / Device Role / Timing Role: Dual-loop controller using ISP/ISN for CC phase and FB for CV phase, with seamless transition at VOUT = 24V. Use Value: ±4% current sense accuracy ensures precise charge termination; spread spectrum reduces conducted EMI in noisy factory environments. |
| Telecom 48V Battery Backup System | High-Frequency Portable Medical PSU |
|
Use Scenario: Provides uninterrupted 48V output from either primary AC/DC supply or backup 36–58V Li-ion battery pack. IC Role / Device Role / Timing Role: Bidirectional-capable controller managing power flow direction and maintaining regulation during source switchover. Use Value: 150kHz–650kHz adjustable frequency allows optimization for low-noise medical-grade filtering or compact magnetics in telecom chassis. |
Use Scenario: Powers portable ultrasound or infusion pump from single-cell Li-ion (3.0–4.2V) while delivering regulated 5V/3.3V rails. IC Role / Device Role / Timing Role: High-efficiency boost regulator operating exclusively in boost region with minimal external components. Use Value: Integrated bootstrap diodes reduce BOM count; 98% peak efficiency extends battery runtime without active cooling. |
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#TRPBF | Lower max VIN (40V vs. 60V); same 28-pin TSSOP package; no EXTVCC pin; fixed 1.2V reference (vs. 2.0V on LT8392). | Suitable for 24V industrial systems but not automotive load-dump or 48V telecom; lacks EXTVCC efficiency optimization path. | Select when VIN ≤ 40V and EXTVCC functionality is unnecessary; offers lower cost and identical footprint. |
| MPQ4332GSD-AEC1-Z | Automotive-grade 36V max VIN; integrated power MOSFETs (no external FETs); 17-pin QFN; fixed 500kHz frequency; no spread spectrum. | Targeted at space-constrained automotive modules; eliminates gate driver design but sacrifices topology flexibility and EMI control. | Select for AEC-Q100-compliant, low-component-count designs where 36V VIN ceiling and fixed frequency are acceptable. |
Compared with LT8390AIFE#TRPBF and MPQ4332GSD-AEC1-Z, the LT8392EFE#TRPBF uniquely supports 60V transient tolerance, spread spectrum EMI reduction, and dual-input current sensing - making it the only choice for robust, high-flexibility 4-switch buck-boost regulation in demanding automotive and industrial applications.
Availability
LT8392EFE#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial supercapacitor chargers, and telecom battery backup systems requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT8392EFE#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 LT8392 belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, designed specifically for wide-input, wide-output, high-efficiency power conversion in harsh environments where reliability and EMI performance are critical.
FAQ
What is the maximum input voltage rating for the LT8392EFE#TRPBF?
The LT8392EFE#TRPBF has an absolute maximum VIN rating of 60V, with guaranteed operation from 3V to 60V across its full –40°C to 125°C junction temperature range. This makes the LT8392EFE#TRPBF suitable for automotive applications subject to load-dump transients and industrial systems with wide input rails.
Does the LT8392EFE#TRPBF support spread spectrum frequency modulation?
Yes, the LT8392EFE#TRPBF supports triangle spread spectrum modulation with ±15% deviation around its internal oscillator frequency when the SYNC/SPRD pin is tied to INTVCC. This feature directly reduces peak radiated and conducted EMI, aiding compliance with CISPR-25 and EN 55032 standards without additional filtering components.
How does the LT8392EFE#TRPBF handle transitions between buck, buck-boost, and boost modes?
The LT8392EFE#TRPBF uses a proprietary peak-buck/peak-boost current mode control scheme that automatically and seamlessly transitions between operating regions based on real-time VIN/VOUT ratio. Hysteresis prevents chattering, and the shared VC error amplifier ensures continuous regulation without output disturbance during crossing points.
Can the LT8392EFE#TRPBF regulate both voltage and current simultaneously?
Yes, the LT8392EFE#TRPBF supports dual-loop regulation: FB pin for constant-voltage (CV) mode and ISP/ISN pins with CTRL pin programming for constant-current (CC) mode. The control logic prioritizes CC during charging and switches to CV at termination, with smooth handover enabled by balanced EA1/EA2 gains.
What package type and thermal characteristics does the LT8392EFE#TRPBF use?
The LT8392EFE#TRPBF is supplied in a 28-lead plastic TSSOP package with exposed pad (pin 29 = GND), featuring θJA = 30°C/W and θJC = 5°C/W. The exposed pad must be soldered to a PCB ground plane to achieve specified thermal performance and ensure reliable operation at full load in high-temperature environments.
LT8392EFE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT8392EFE#TRPBF FAQ
1.How can I place an order for LT8392EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8392EFE#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 LT8392EFE#TRPBF reliable?
The price and inventory of LT8392EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8392EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8392EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8392EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8392EFE#TRPBF?
LT8392EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8392EFE#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 LT8392EFE#TRPBF?
For technical support, including LT8392EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8392EFE#TRPBF requirements.
6.How does Aetrix verify that LT8392EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8392EFE#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 LT8392EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8392EFE#TRPBF?
All LT8392EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8392EFE#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 LT8392EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8392EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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