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Analog Devices Inc. LT8392HFE#PBF
- Part No.:
- LT8392HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8392HFE#PBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST LED
- Quantity:
- Payment:
- Shipping:
Inventory:2,531
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Product details
Overview
LT8392HFE#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% VOUT accuracy, 98% peak efficiency at 12V/8A, and proprietary peak-buck/peak-boost current mode control for seamless VIN-above/VIN-below/VIN-equal-VOUT operation in automotive voltage regulators and battery chargers.
For engineers reviewing the LT8392HFE#PBF datasheet, LT8392HFE#PBF pinout, LT8392HFE#PBF application, or LT8392HFE#PBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal performance (–40°C to 150°C), spread-spectrum EMI reduction, and real-world current-sense accuracy (±4%) - all critical for high-reliability power system design.
Technical Context
The LT8392HFE#PBF implements ADI's proprietary dual-mode current control architecture: peak-buck mode dominates when VIN ≥ VOUT, peak-boost mode activates when VIN ≤ VOUT, with hysteresis-enabled smooth transitions across buck, buck-boost, and boost regions. Its single-inductor, four-MOSFET topology eliminates need for coupled inductors or multiple chokes.
It integrates dual bootstrap drivers (BST1/BST2) with internal Schottky diodes, 5V INTVCC LDO (4.8–5.2V, 190mA limit), 2V VREF reference (±2% over temp), and programmable fault response (hiccup/latch-off/keep-running) via SS pin resistor configuration - all operating within its guaranteed –40°C to 150°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 60V (requires EXTVCC ≥ 4.5V below 4V); enables direct integration into 12V/24V/48V automotive and industrial rails without pre-regulation. |
| VOUT Range | 1V to 60V with ±1.5% regulation accuracy; supports wide-output applications like supercapacitor charging and variable-battery systems. |
| Switching Frequency | 150kHz–650kHz adjustable via RT resistor; ±15% triangle spread spectrum reduces EMI peaks without external filtering. |
| Current Sense Accuracy | ±4% for ISP/ISN monitoring; enables precise input/output current limiting and telemetry in battery management and power delivery. |
| Thermal Rating | –40°C to 150°C junction temperature (H-grade); qualified for under-hood automotive and high-temp industrial environments. |
| Efficiency | Up to 98% at 12V/8A (96W); achieved via low-RDS(on) gate drivers (TG1/TG2: 2.6Ω pull-up; BG1/BG2: 3.2Ω pull-up) and integrated bootstrap diodes. |
| Protection Features | Output short-circuit detection with configurable response (hiccup/latch-off/continuous), PGOOD flag, FB short detection (0.25V threshold), and thermal shutdown (~165°C). |
Pinout & Package
LT8392HFE#PBF uses 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; 3.2Ω pull-down ensures fast turn-off and reverse-current blocking in buck/boost phases. |
| TG1, TG2 | Buck/Boost top gate drives | Drive N-channel MOSFET gates from SWx to BSTx; 2.6Ω pull-up sustains high-side switching with minimal dead-time loss. |
| LSP/LSN | Buck-side inductor current sense | Kelvin-connected inputs for accurate peak-buck current measurement; supports RSENSE down to sub-mΩ for high-current designs. |
| ISP/ISN | Input/output current sense | Dedicated differential inputs for programmable current regulation (via CTRL) and ±4% monitor output (ISMON = 20×V(ISP–ISN) + 0.25V). |
| FB | Voltage feedback input | Regulates VOUT to 1.00V reference; ±0.5% line/load regulation enables stable CV operation across wide input/output ranges. |
| PGOOD | Open-drain power-good flag | Asserts low when FB deviates >±8% from target; requires external pull-up; signals system controller that regulated output is valid. |
| SYNC/SPRD | Frequency control terminal | GND = fixed frequency; INTVCC = ±15% spread spectrum; external clock = synchronization - no additional components needed. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for magnetic coupling or multiple inductors; reduces BOM count and board area while enabling bidirectional VIN/VOUT flexibility. |
| Proprietary peak-buck/peak-boost control | Enables continuous conduction mode across all three regions (buck/buck-boost/boost) with <100ns transition delay and no output disturbance. |
| Integrated bootstrap diodes | Reduces external component count by two Schottky diodes per channel; maintains BST1/BST2 charge during sustained high-side conduction. |
| Programmable fault response | SS pin resistor selection (0Ω/100kΩ/499kΩ) configures hiccup, keep-running, or latch-off behavior during output short - no firmware required. |
| VOUT-disconnected-in-shutdown | Internal isolation disconnects VOUT from VIN during EN/UVLO < 0.3V; prevents backfeed and enables safe hot-swap in redundant power systems. |
Applications
| Automotive Voltage Regulation | Battery & Supercapacitor Charging |
|---|---|
|
Use Scenario: Regulating 12V/24V/48V vehicle battery rails to stable 5V/12V/15V outputs despite cold-crank (4.5V) or load-dump (60V) transients. IC Role / Device Role / Timing Role: 4-switch buck-boost controller managing seamless transitions between buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT) modes. Use Value: Maintains regulated output during 3V–60V input swings with <1% VOUT deviation and no mode-change glitches - critical for ADAS and infotainment ECUs. |
Use Scenario: Charging Li-ion, lead-acid, or supercapacitor banks from variable sources (solar, alternator, USB-PD) with constant-current/constant-voltage profiles. IC Role / Device Role / Timing Role: Precision current-mode controller regulating ISP/ISN sense voltage to set charge current, while FB loop manages termination voltage. Use Value: ±4% current accuracy and ±1.5% VOUT accuracy enable compliant CC/CV charging; spread spectrum minimizes EMI interference with sensitive battery sensors. |
| Industrial Power Supply | Telecom Intermediate Bus Converter |
|
Use Scenario: Generating isolated or non-isolated 3.3V/5V/12V rails from unregulated 24V/48V factory bus with high reliability and thermal resilience. IC Role / Device Role / Timing Role: High-efficiency (98%) buck-boost controller operating continuously at 150°C junction temperature in enclosed enclosures. Use Value: H-grade rating (–40°C to 150°C), robust fault protection, and 30°C/W θJA enable fanless operation in DIN-rail mounted PLCs and motor drives. |
Use Scenario: Converting 48V telecom rectifier output to 12V intermediate bus for downstream POL converters in base station equipment. IC Role / Device Role / Timing Role: Fixed-frequency (200–650kHz) controller with SYNC input enabling phase alignment across multiple converters to reduce input ripple. Use Value: Synchronizable operation and low-noise spread spectrum allow dense multi-rail designs meeting stringent EN55032 Class B EMI limits without oversized filters. |
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 |
|---|---|---|---|
| LT8390AHFE#PBF | Same 28-lead TSSOP package and –40°C to 150°C rating, but lower max VIN (40V vs 60V) and no ISP/ISN current monitor; lacks ISMON output. | Suitable for 24V/36V systems only; cannot support input-current telemetry or parallel master-slave configurations. | Select LT8392HFE#PBF when 60V input capability, ISP/ISN monitoring, or ISMON-based current sharing is required. |
| MPQ4333HG-AEC1-P | Automotive-grade 4-switch buck-boost (3.3V–40V VIN, 0.8V–24V VOUT), but fixed 400kHz frequency, no spread spectrum, and only VOUT current sense (no ISP). | Limited to lower-voltage automotive domains (e.g., body electronics); lacks programmable fault response and dual-region current sensing. | Choose LT8392HFE#PBF for full 60V input range, ±15% EMI reduction, and independent input/output current regulation capability. |
Compared with LT8390AHFE#PBF and MPQ4333HG-AEC1-P, the LT8392HFE#PBF uniquely combines 60V input tolerance, ISP/ISN dual-current sensing, spread-spectrum modulation, and H-grade thermal rating - making it the only option for high-voltage, high-accuracy, low-EMI automotive and industrial buck-boost regulation.
Availability
LT8392HFE#PBF is available at Aetrix Electronics and suitable for automotive voltage regulation, battery/supercapacitor charging, and industrial power supply applications requiring stable component supply, long-term lifecycle support, and guaranteed H-grade thermal performance.
Supply support for LT8392HFE#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. (ADI) 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 ADI's Power by Linear™ controller family, designed specifically for high-efficiency, wide-input-range DC/DC conversion in harsh environments where reliability, thermal resilience, and EMI control are non-negotiable.
FAQ
What is the maximum input voltage supported by the LT8392HFE#PBF?
The LT8392HFE#PBF supports an absolute maximum input voltage of 60V on the VIN pin. Its operational VIN range is 3V to 60V, though operation below 4V requires EXTVCC ≥ 4.5V to ensure proper INTVCC LDO startup. This 60V rating makes LT8392HFE#PBF suitable for automotive load-dump and industrial 48V systems without external clamping.
How does the LT8392HFE#PBF handle transitions between buck, buck-boost, and boost modes?
The LT8392HFE#PBF uses ADI's proprietary peak-buck/peak-boost current mode control with hysteresis to ensure seamless, glitch-free transitions. It detects VIN/VOUT ratio in real time and switches control logic - peak-buck in buck/buck-boost regions, peak-boost in buck-boost/boost regions - with no output disturbance or need for external mode-selection circuitry.
Can the LT8392HFE#PBF regulate both input and output current?
Yes, the LT8392HFE#PBF supports independent regulation of input current (via ISP/ISN pins) and output voltage (via FB pin). The CTRL pin sets the ISP/ISN current limit threshold (0–50mV), and ISMON provides a buffered 20×V(ISP–ISN) + 0.25V output for telemetry or master-slave current sharing - all with ±4% accuracy.
What thermal grade does the LT8392HFE#PBF carry, and how is it validated?
The LT8392HFE#PBF carries the H-grade qualification, guaranteeing full electrical performance from –40°C to 150°C junction temperature. This is validated per Analog Devices' internal stress testing and characterization protocols - distinct from E-grade (–40°C to 125°C) and J-grade (–40°C to 150°C with different screening) variants.
Does the LT8392HFE#PBF include spread-spectrum frequency modulation, and how is it enabled?
Yes, the LT8392HFE#PBF includes triangle spread-spectrum modulation with ±15% deviation around the nominal switching frequency. It is enabled by tying the SYNC/SPRD pin to INTVCC (5V). No external components are required - unlike fixed-frequency or externally synchronized operation, which use GND or an external clock signal respectively.
LT8392HFE#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
LT8392HFE#PBF FAQ
1.How can I place an order for LT8392HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8392HFE#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 LT8392HFE#PBF reliable?
The price and inventory of LT8392HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8392HFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8392HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8392HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8392HFE#PBF?
LT8392HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8392HFE#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 LT8392HFE#PBF?
For technical support, including LT8392HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8392HFE#PBF requirements.
6.How does Aetrix verify that LT8392HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8392HFE#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 LT8392HFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8392HFE#PBF?
All LT8392HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8392HFE#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 LT8392HFE#PBF part is unused and in its original packaging.
Return procedure for LT8392HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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