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Analog Devices Inc. LT8392JUFD#TRPBF
- Part No.:
- LT8392JUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8392JUFD#TRPBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST LED
- Quantity:
- Payment:
- Shipping:
Inventory:4,501
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Product details
Overview
LT8392JUFD#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, 150kHz–650kHz adjustable switching frequency, and integrated bootstrap diodes. It enables seamless mode transitions in automotive voltage regulators, battery chargers, and telecom power supplies.
For engineers reviewing the LT8392JUFD#TRPBF datasheet, LT8392JUFD#TRPBF pinout, LT8392JUFD#TRPBF application, or LT8392JUFD#TRPBF equivalent, key selection criteria include its J-grade (–40°C to 150°C) operation, QFN-28 (4mm × 5mm) package with exposed thermal pad, spread-spectrum EMI reduction, and dual current-sense capability for input/output current regulation.
Technical Context
The LT8392JUFD#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current-mode control architecture, using a single inductor current sense resistor (LSP/LSN) and independent ISP/ISN inputs for input/output current monitoring. Its four-state operation-peak-buck in buck region, peak-buck in buck-boost region, peak-boost in buck-boost region, and peak-boost in boost region-ensures smooth, low-noise transitions across VIN/VOUT ratios from 0.75 to 1.33.
It integrates two independent gate drivers (TG1/BG1 and TG2/BG2), internal 5V INTVCC LDO with 130–250mA current limit, 2V VREF reference, and programmable fault responses (hiccup, latch-off, or continuous operation) during output short-circuit events. Spread spectrum modulation (±12% to ±18%) is enabled via SYNC/SPRD pin tied to INTVCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 60V - supports wide-input applications including 12V/24V/48V automotive and industrial rails. |
| VOUT Range | 1V to 60V - enables single-controller solutions for battery charging (e.g., 12V, 24V, 48V Li-ion stacks) and regulated outputs across buck/boost boundaries. |
| Switching Frequency | 150kHz–650kHz (adjustable via RT resistor) - allows optimization of size vs. efficiency; internal oscillator at 400kHz (TYP) with ±15% triangle spread spectrum. |
| Output Voltage Accuracy | ±1.5% over –40°C to 150°C - ensures stable regulation under extreme ambient conditions without external trimming. |
| Current Sense Accuracy | ±4% for ISP/ISN monitoring - enables precise input or output current limiting and telemetry in battery management and power delivery systems. |
| Operating Junction Temp | –40°C to 150°C (J-grade) - qualified for under-hood automotive and high-temp industrial environments. |
| Package | 28-Lead QFN (4mm × 5mm) with exposed GND pad - provides low θJC = 3.4°C/W for high-power thermal management. |
Pinout & Package
LT8392JUFD#TRPBF is housed in a 28-lead plastic QFN (4mm × 5mm) with exposed thermal pad (Pin 29 = GND). The package features optimized thermal resistance (θJA = 43°C/W, θJC = 3.4°C/W) and requires soldering the exposed pad directly to PCB ground plane.
| 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 Kelvin sensing on LSP/LSN for accurate current mode control. |
| TG1, BG1, TG2, BG2 | N-channel MOSFET gate drivers | TG1/BG1 drive buck-side FETs; TG2/BG2 drive boost-side FETs; each pair uses bootstrap supply (BST1/BST2) with integrated Schottky diodes. |
| LSP / LSN | Inductor current sense inputs | Kelvin-connected across RSENSE to enable accurate peak-buck/peak-boost current sensing across all operating regions. |
| ISP / ISN | Input/output current monitor inputs | Support bidirectional current measurement; used for CC/CV battery charging or input current limiting with ±4% accuracy. |
| FB | Voltage feedback input | Regulates VOUT to 1.00V reference; ±1.5% accuracy over full temperature range enables precision CV regulation. |
| CTRL | Current limit programming input | Accepts 0.25V–1.35V analog voltage to linearly set ISP/ISN current threshold from 0mV to 50mV full-scale. |
| SYNC/SPRD | Frequency control input | GND = fixed frequency; INTVCC = ±15% triangle spread spectrum; external clock = synchronization up to 650kHz. |
| PGOOD | Open-drain power-good flag | Asserts low when FB is within ±8% of target - provides system-level power sequencing and fault indication. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck + boost controllers; reduces BOM count and board area while enabling VIN <> VOUT operation. |
| Proprietary peak-buck/peak-boost control | Ensures continuous conduction and zero-crossing transition between buck, buck-boost, and boost modes - no output glitch or audible noise. |
| Integrated bootstrap diodes | Reduces external component count by eliminating discrete bootstrap diodes; supports reliable high-side gate drive in all operating regions. |
| Programmable fault response | SS pin resistor selection (0Ω, 100kΩ, 499kΩ) configures short-circuit behavior as hiccup, keep-running, or latch-off - simplifies system-level fault handling. |
| VOUT disconnected from VIN during shutdown | Prevents backfeed from output to input rail; critical for battery-powered systems requiring true input isolation in standby. |
Applications
| Automotive Front-End Power Supply | Industrial 24V/48V Battery Charger |
|---|---|
|
Use Scenario: Regulating 12V battery input to stable 5V/3.3V for ADAS ECUs under cold-crank (4.5V) and load-dump (60V) transients. IC Role / Device Role / Timing Role: Primary buck-boost controller managing wide VIN range, seamless mode transitions, and PGOOD sequencing for microcontroller reset. Use Value: Maintains regulation across 4.5V–60V input without external pre-regulators; ±1.5% VOUT accuracy ensures reliable logic supply under thermal stress. |
Use Scenario: Charging 24V LiFePO₄ or 48V NMC battery packs from variable solar or generator sources with constant-current/constant-voltage profiles. IC Role / Device Role / Timing Role: Dual-loop controller regulating both output voltage (via FB) and charge current (via ISP/ISN) with independent accuracy and thermal derating. Use Value: ±4% current sense accuracy enables precise CC phase termination; J-grade rating supports enclosure temperatures up to 150°C ambient. |
| Telecom 48V Intermediate Bus Converter | High-Frequency Portable Medical PSU |
|
Use Scenario: Generating isolated 12V/5V rails from 48V telecom rectifier bus, requiring low EMI in dense rack-mounted equipment. IC Role / Device Role / Timing Role: High-frequency (≥400kHz) buck-boost controller with spread-spectrum modulation to meet CISPR-32 Class B conducted emissions limits. Use Value: Triangle spread spectrum (±15%) reduces peak EMI by >10dB; QFN-28 package enables compact layout with minimal loop area. |
Use Scenario: Powering portable ultrasound or infusion pumps from single-cell or multi-cell Li-ion batteries with dynamic load steps. IC Role / Device Role / Timing Role: Single-inductor buck-boost controller delivering stable output despite battery voltage sag from 4.2V down to 2.7V under load. Use Value: Seamless buck-to-boost transition prevents brownout during deep discharge; 98% peak efficiency extends runtime per charge cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous 4-switch buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390JUFD#TRPBF | Lower max VIN (40V vs. 60V); identical J-grade temp range, QFN-28 package, and control architecture. | Suitable for 24V/36V systems but not 48V+ automotive or industrial input rails. | Select LT8392JUFD#TRPBF when input must withstand 60V transients (e.g., ISO 16750-2 load dump). |
| MPQ4332GSD-AEC1-Z | AEC-Q100 Grade 1 (–40°C to 125°C); 36V max VIN; no spread spectrum; different pinout and current-sense topology. | Validated for automotive infotainment but lacks J-grade thermal margin and EMI-reduction features. | Choose LT8392JUFD#TRPBF for under-hood deployment requiring 150°C junction operation and low-EMI compliance. |
Compared with LT8390JUFD#TRPBF and MPQ4332GSD-AEC1-Z, the LT8392JUFD#TRPBF uniquely combines 60V input tolerance, 150°C operation, integrated spread spectrum, and dual current-sense capability - making it optimal for high-reliability, wide-input, thermally constrained buck-boost designs.
Availability
LT8392JUFD#TRPBF is available at Aetrix Electronics and suitable for automotive front-end power supplies, industrial battery chargers, and telecom intermediate bus converters requiring stable component supply, long-term lifecycle support, and guaranteed J-grade performance.
Supply support for LT8392JUFD#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-efficiency DC/DC controllers, designed specifically for wide-input, wide-output, and high-temperature power conversion in mission-critical systems.
FAQ
What is the maximum input voltage rating for the LT8392JUFD#TRPBF?
The LT8392JUFD#TRPBF has an absolute maximum VIN rating of 60V, with operational input range specified from 3V to 60V. This allows direct interface with 48V industrial buses and automotive systems subject to ISO 16750-2 load-dump transients. Exceeding 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT8392JUFD#TRPBF support spread-spectrum frequency modulation?
Yes, the LT8392JUFD#TRPBF supports triangle spread-spectrum modulation with ±12% to ±18% deviation around the nominal switching frequency when the SYNC/SPRD pin is tied to INTVCC. This feature reduces peak EMI by spreading energy across a bandwidth, aiding compliance with CISPR-32 and FCC Part 15 standards.
How does the LT8392JUFD#TRPBF handle thermal overload conditions?
The LT8392JUFD#TRPBF includes overtemperature protection that activates above ~165°C junction temperature, forcing shutdown until cooldown. Unlike thermal shutdown latches, this is momentary protection - the device resumes operation once TJ falls below the hysteresis threshold. Continuous operation above 150°C degrades lifetime and is not recommended.
Can the LT8392JUFD#TRPBF regulate both voltage and current simultaneously?
No - the LT8392JUFD#TRPBF operates in either constant-voltage (CV) mode via FB feedback or constant-current (CC) mode via ISP/ISN inputs, but not both simultaneously. However, its dual-loop architecture allows seamless handoff between CV and CC phases (e.g., in battery charging), controlled externally via system-level sequencing.
What is the purpose of the TEST and TRIM pins on the LT8392JUFD#TRPBF?
The TEST pin must be connected directly to GND for normal operation; leaving it floating or unconnected disables the device. The TRIM pin must be connected directly to VREF; it is reserved for factory calibration and has no user-accessible function. Both pins are mandatory connections - not optional - per the datasheet Pin Functions section.
LT8392JUFD#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)
LT8392JUFD#TRPBF FAQ
1.How can I place an order for LT8392JUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8392JUFD#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 LT8392JUFD#TRPBF reliable?
The price and inventory of LT8392JUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8392JUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8392JUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8392JUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8392JUFD#TRPBF?
LT8392JUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8392JUFD#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 LT8392JUFD#TRPBF?
For technical support, including LT8392JUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8392JUFD#TRPBF requirements.
6.How does Aetrix verify that LT8392JUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8392JUFD#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 LT8392JUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8392JUFD#TRPBF?
All LT8392JUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8392JUFD#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 LT8392JUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT8392JUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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