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Analog Devices Inc. LT8392HFE#TRPBF
- Part No.:
- LT8392HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8392HFE#TRPBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST LED
- Quantity:
- Payment:
- Shipping:
Inventory:1,600
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Product details
Overview
LT8392HFE#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 buck/buck-boost/boost mode transitions. It delivers precise input or output current regulation (±4%), spread-spectrum EMI reduction, and operates across –40°C to 150°C junction temperature in automotive battery charging and industrial power systems.
For engineers reviewing the LT8392HFE#TRPBF datasheet, LT8392HFE#TRPBF pinout, LT8392HFE#TRPBF application, or LT8392HFE#TRPBF equivalent, key selection criteria include its 28-lead TSSOP package with exposed pad, 150kHz–650kHz adjustable switching frequency, integrated bootstrap diodes, and dual current sense architecture for bidirectional regulation in wide-input-range voltage regulator designs.
Technical Context
The LT8392HFE#TRPBF 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 independent 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-enables smooth, low-noise transitions across VIN/VOUT ratios from 0.75 to 1.33.
Control logic dynamically selects between buck and boost comparators (A3/A4) based on real-time VIN/VOUT ratio, while VC pin voltage sets the current threshold for both paths. The device integrates two independent gate drivers (TG1/BG1 and TG2/BG2), internal 5V INTVCC LDO, 2V VREF reference, and programmable fault response (hiccup/latch-off/keep-running) via SS pin resistor configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 60V - supports cold-crank automotive (4.5V min with EXTVCC ≥ 4.5V) and wide-input industrial supplies. |
| VOUT Range | 1V to 60V - enables single-controller solutions for battery charging (e.g., 12V/24V/48V Li-ion stacks) and variable-output telecom rails. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT resistor) - balances efficiency, size, and EMI; ±15% triangle spread spectrum reduces peak emissions. |
| Output Voltage Accuracy | ±1.5% over –40°C to 150°C - ensures stable regulation in under-hood automotive and high-temp industrial environments. |
| Current Sense Accuracy | ±4% for ISP/ISN or LSP/LSN monitoring - enables reliable CC/CV battery charge control and input current limiting. |
| Efficiency | 98% at 12V/8A (96W) - minimizes thermal stress in compact, high-power-density designs without forced air cooling. |
| Junction Temp Range | –40°C to 150°C - qualified for AEC-Q100 Grade H applications requiring extended high-temp reliability. |
Pinout & Package
LT8392HFE#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; 3.2Ω pull-up / 1.2Ω pull-down resistance ensures fast turn-on/turn-off. |
| TG1, TG2 | Buck/Boost top gate drives | Drive N-channel MOSFET gates from SWx to BSTx; 2.6Ω pull-up / 1.4Ω pull-down enables efficient high-side switching. |
| LSP/LSN | Buck-side inductor current sense | Kelvin-connected inputs for accurate peak-buck current mode control and reverse-current detection in all operating regions. |
| ISP/ISN | Input/output current monitor sense | Independent Kelvin inputs for precise input current (ISP–ISN) regulation or output current feedback in CC mode. |
| FB | Voltage feedback input | Regulates VOUT to 1.00V reference; ±0.2% line/load regulation enables tight CV control across wide input/output ranges. |
| CTRL | Current limit programming | Accepts 0.25V–1.35V analog voltage to linearly scale ISP/ISN current threshold from 0mV to 50mV full-scale. |
| PGOOD | Open-drain power-good flag | Asserts low when FB is within ±8% of target - provides system-level sequencing and fault indication without external logic. |
| SYNC/SPRD | Frequency control | GND = fixed frequency; INTVCC = ±15% spread spectrum; external clock = synchronization - eliminates beat frequencies in multi-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck + boost controllers; reduces BOM count, board area, and design complexity in VIN-above/below-VOUT systems. |
| Proprietary peak-buck/peak-boost control | Enables continuous conduction mode across all three regions (buck, buck-boost, boost) with <10µs transition time and no output glitch. |
| Integrated bootstrap diodes | Reduces external component count by two Schottky diodes per channel; simplifies layout and improves reliability in high-vibration environments. |
| VOUT disconnected from VIN during shutdown | Prevents backfeed into input rail - critical for battery-powered systems where load isolation preserves standby energy. |
| Programmable short-circuit response | Three modes (hiccup, latch-off, keep-running) selected via SS-to-VREF resistor - allows tailoring fault behavior to system safety requirements. |
Applications
| Automotive Battery Charger | Industrial 24V/48V Power Supply |
|---|---|
|
Use Scenario: Charging 12V/24V/48V LiFePO₄ or lead-acid batteries from variable vehicle bus (6V–36V transient, 9V–16V nominal). IC Role / Device Role / Timing Role: 4-switch buck-boost controller regulating constant voltage (CV) and constant current (CC) with input current limiting and thermal foldback. Use Value: Maintains >95% efficiency across cold-crank (6V) and load-dump (36V) conditions while enabling single-stage architecture instead of cascaded converters. |
Use Scenario: Generating stable 24V or 48V output from unregulated 18V–60V industrial DC bus (e.g., factory automation, robotics, PoE++ infrastructure). IC Role / Device Role / Timing Role: Primary DC/DC controller managing wide-input regulation, output current monitoring, and PGOOD sequencing for downstream SMPS and FPGA power rails. Use Value: Eliminates need for pre-regulator stage; supports 150°C junction operation for sealed enclosures without derating. |
| Telecom 48V Backup System | High-Frequency Portable Equipment |
|
Use Scenario: Bidirectional power management in 48V telecom backup systems, accepting input from rectified AC or batteries and delivering regulated 48V output. IC Role / Device Role / Timing Role: Synchronous buck-boost controller with input/output current monitoring, spread-spectrum EMI control, and fault latching for grid-tied redundancy. Use Value: Meets EN55022 Class B conducted/radiated EMI limits without shielding; ±4% current accuracy enables precise battery SOC estimation. |
Use Scenario: Compact, high-efficiency power conversion in portable test equipment requiring 5V/12V/15V outputs from single-cell (3.0V–4.2V) or dual-cell Li-ion packs. IC Role / Device Role / Timing Role: Wide-input buck-boost controller supporting dynamic VOUT adjustment and soft-start ramp control via SS pin capacitor. Use Value: Achieves 96% efficiency at 1A load with 200kHz switching - extends runtime while minimizing heat in fanless enclosures. |
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 |
|---|---|---|---|
| LTC3780EFE#PBF | Fixed 100kHz–600kHz sync range; no spread spectrum; ±2% VOUT accuracy; max 40V VIN; TSSOP-28, –40°C to 125°C. | Lacks spread-spectrum EMI reduction and automotive-grade temp rating; suitable for cost-sensitive industrial supplies where EMI is managed externally. | Select LTC3780EFE#PBF only if spread spectrum is unnecessary and junction temperature stays ≤125°C. |
| MPQ4332GSD-AEC1-Z | Automotive-qualified (AEC-Q100); 4.5V–36V VIN; 0.8V–25V VOUT; 95% efficiency; QFN-24; –40°C to 125°C; no ISP/ISN current monitor. | Lower VIN/VOUT range and no independent input/output current sensing; optimized for infotainment rather than high-power battery charging. | Choose MPQ4332GSD-AEC1-Z for space-constrained AEC-Q100 applications below 36V input where dual current monitoring is not required. |
Compared with LTC3780EFE#PBF and MPQ4332GSD-AEC1-Z, LT8392HFE#TRPBF uniquely combines 60V input capability, ±1.5% output accuracy over 150°C, spread-spectrum EMI suppression, and dual-path current monitoring - making it the only option qualified for high-reliability, wide-range automotive battery chargers and industrial 48V systems.
Availability
LT8392HFE#TRPBF is available at Aetrix Electronics and suitable for automotive battery charging, industrial 24V/48V power supplies, and telecom backup systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8392HFE#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 precision instrumentation, industrial automation, automotive, and communications markets.
The LT8392 product line was designed specifically for high-efficiency, wide-input-range DC/DC conversion in harsh-environment applications - emphasizing seamless mode transitions, robust fault protection, and automotive-grade thermal reliability.
FAQ
What is the maximum operating junction temperature for LT8392HFE#TRPBF?
The LT8392HFE#TRPBF is guaranteed over a junction temperature range of –40°C to 150°C, meeting AEC-Q100 Grade H requirements. Its thermal shutdown activates at ~165°C, and continuous operation above 125°C requires lifetime derating per Analog Devices' reliability guidelines. The 28-lead TSSOP package features an exposed pad (pin 29) that must be soldered to PCB ground to achieve θJC = 5°C/W and sustain full-load operation at 150°C ambient.
Does LT8392HFE#TRPBF support both constant-voltage and constant-current regulation?
Yes, LT8392HFE#TRPBF supports simultaneous and seamless constant-voltage (CV) and constant-current (CC) regulation. CV is implemented via the FB pin (regulated to 1.00V), while CC is achieved using the ISP/ISN pins with threshold programmable via the CTRL pin (0–50mV full-scale). The device automatically transitions between CV and CC modes without interruption, enabling precise battery charging profiles and programmable current limiting in industrial power supplies.
How does the spread-spectrum feature work on LT8392HFE#TRPBF?
When the SYNC/SPRD pin is tied to INTVCC, LT8392HFE#TRPBF enables ±15% triangle spread-spectrum modulation around its internal oscillator frequency (set by RT resistor). This dithers the switching frequency continuously to reduce peak radiated and conducted EMI by up to 10dB, helping meet CISPR 25 Class 5 and EN55022 Class B standards without added filtering components. The modulation is internally generated and requires no external clock source.
Can LT8392HFE#TRPBF operate with input voltage below 3V?
No, LT8392HFE#TRPBF has a minimum specified VIN of 3V when EXTVCC = 0V. If EXTVCC ≥ 4.5V is supplied externally, the effective minimum VIN drops to 3V - but operation below 3V is not characterized or guaranteed. Attempting sub-3V operation risks failure to start, unstable regulation, or violation of absolute maximum ratings on internal LDOs and gate drivers.
What is the purpose of the TEST and TRIM pins on LT8392HFE#TRPBF?
The TEST pin on LT8392HFE#TRPBF must be connected directly to GND for normal operation; leaving it floating or applying voltage may cause undefined behavior or startup failure. The TRIM pin must be connected directly to VREF (2.00V) to enable proper internal reference calibration. Neither pin is user-configurable - both are factory-assigned and require hard-wired connections per the datasheet to ensure functional reliability.
LT8392HFE#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
LT8392HFE#TRPBF FAQ
1.How can I place an order for LT8392HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8392HFE#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 LT8392HFE#TRPBF reliable?
The price and inventory of LT8392HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8392HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8392HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8392HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8392HFE#TRPBF?
LT8392HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8392HFE#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 LT8392HFE#TRPBF?
For technical support, including LT8392HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8392HFE#TRPBF requirements.
6.How does Aetrix verify that LT8392HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8392HFE#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 LT8392HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8392HFE#TRPBF?
All LT8392HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8392HFE#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 LT8392HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8392HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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