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Analog Devices Inc. LT8390AEFE#PBF
- Part No.:
- LT8390AEFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390AEFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 28
- Quantity:
- Payment:
- Shipping:
Inventory:2,611
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Product details
Overview
LT8390AEFE#PBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V–60V input and 0V–60V output, operating at up to 2MHz with spread spectrum EMI reduction. It delivers ±1.5% output voltage accuracy, ±3% current sensing accuracy, and 95% peak efficiency in 2MHz operation-enabling compact, high-frequency power conversion in automotive battery systems and industrial voltage regulators.
For engineers reviewing the LT8390AEFE#PBF datasheet, LT8390AEFE#PBF pinout, LT8390AEFE#PBF application, or LT8390AEFE#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal performance (–40°C to 125°C), and real-world design meaning for seamless integration into VIN-above/below/equal-to-VOUT systems.
Technical Context
The LT8390AEFE#PBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control, enabling continuous conduction across buck, buck-boost, and boost regions without discontinuity or audible noise. Its dual-region transition thresholds (e.g., buck-boost to boost at VIN/VOUT = 0.75, buck to buck-boost at 1.25) ensure smooth mode switching with hysteresis to prevent chattering.
It integrates two independent gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), internal 5V INTVCC LDO, 2V VREF reference, and dedicated ISP/ISN current sense amplifier with 10× ISMON monitor output. The SS pin supports soft-start timing and configurable fault response (hiccup/latch-off/keep-running) via external resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range inputs including 12V/24V/48V automotive batteries and industrial rails. |
| Output Voltage Range | 0V to 60V - enables bidirectional regulation, battery charging, and supercapacitor management. |
| Switching Frequency | 600kHz to 2MHz (adjustable via RT pin) - allows optimization of size vs. efficiency; 2MHz enables <1µH inductors. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable feedback loop performance across full output range. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables precise input/output current limiting and battery charge control. |
| Operating Junction Temp | –40°C to 125°C - qualified per AEC-Q100 Grade E, suitable for under-hood automotive environments. |
| Spread Spectrum Modulation | 25% triangle FM on internal oscillator - reduces peak EMI by spreading energy across frequency band. |
Pinout & Package
LT8390AEFE#PBF is housed in a 28-lead TSSOP package with exposed pad (FE package), θJA = 30°C/W, θJC = 5°C/W. Exposed pad (Pin 29) is GND and must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage feedback input | Regulates output to 1.00V reference; triggers PGOOD and overvoltage/short-circuit protection. |
| ISP / ISN | High-side current sense differential inputs | Enable accurate input/output current monitoring with Kelvin connection; support ±3% accuracy. |
| TG1 / BG1 / SW1 / BST1 | Buck-side MOSFET gate drive and switch node | Control buck-side N-channel stack; BST1 supplies floating gate drive for TG1 with integrated Schottky diode. |
| TG2 / BG2 / SW2 / BST2 | Boost-side MOSFET gate drive and switch node | Control boost-side N-channel stack; BST2 supplies floating gate drive for TG2 referenced to VOUT. |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables external PMOS; LOADTG provides buffered inverted gate drive (VOUT–5V to VOUT). |
| RT | Oscillator frequency setting | Resistor to GND sets fixed frequency from 600kHz to 2MHz; supports synchronization or spread spectrum when tied to INTVCC. |
| SS | Soft-start and fault mode selection | Capacitor to GND sets ramp time; resistor to VREF configures short-circuit response (hiccup/latch-off/keep-running). |
| PGOOD | Open-drain power-good flag | Asserts low when FB is within ±10% of regulation; requires external pull-up for system sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck/boost ICs; supports seamless VIN-above/below/equal-to-VOUT operation. |
| Proprietary peak-buck/peak-boost control | Ensures continuous conduction and low-noise transitions between operating regions without mode jumps. |
| Integrated 5V INTVCC LDO | Powers internal logic and gate drivers from VIN; delivers 145mA typical current with 4.85V–5.15V regulation. |
| Programmable current limit via CTRL pin | Supports linear 5mV–90mV threshold (0.3V–1.15V CTRL) or fixed 100mV full-scale (≥1.35V CTRL). |
| AEC-Q100 qualified (Grade E) | Validated for automotive applications including start-stop systems, infotainment, and ADAS power rails. |
| VOUT-disconnect during shutdown | Isolates output from input when EN/UVLO < 0.3V - prevents backfeed and supports safe system power-down. |
Applications
| Automotive Battery Management | Industrial Wide-Input Voltage Regulator |
|---|---|
Use Scenario: Regulating 12V/24V/48V battery systems with variable load and cold-crank transients (4V–60V). IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller managing bidirectional power flow and maintaining stable 5V/12V/15V rails. Use Value: Enables single-stage conversion across wide VIN range without external pre-regulators; 95% efficiency at 2MHz reduces thermal footprint. |
Use Scenario: Powering programmable logic controllers (PLCs) and sensors from unregulated factory mains (18V–56V). IC Role / Device Role / Timing Role: High-frequency DC/DC controller delivering constant output despite input fluctuations and load steps. Use Value: Spread spectrum modulation meets CISPR-25 Class 5 EMI limits; ±1.5% VOUT accuracy ensures reliable I/O voltage compliance. |
| Telecom 48V Backup Supply | High-Frequency Supercapacitor Charger |
Use Scenario: Maintaining 48V telecom backup rail during AC failure using supercapacitor bank charged from primary supply. IC Role / Device Role / Timing Role: Bidirectional buck-boost controller regulating both charging (buck) and discharge (boost) paths. Use Value: Seamless region transition avoids voltage droop during mode change; ISP/ISN monitoring enables precise charge current control. |
Use Scenario: Charging 0–60V supercapacitors from 12V/24V sources in energy harvesting and UPS systems. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger with programmable ISP/ISN threshold and soft-start ramp. Use Value: CTRL pin programming allows adaptive current limit; SS pin resistor configures latch-off protection against overvoltage faults. |
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 |
|---|---|---|---|
| LT8390AIFE#PBF | Same die, –40°C to 125°C grade, identical pinout and specs - differs only in test screening and traceability documentation. | No functional difference; used where extended reliability reporting is not required. | Select LT8390AEFE#PBF for automotive AEC-Q100-compliant designs requiring full qualification records. |
| LT8390AHFE#PBF | Same functionality but rated for –40°C to 150°C junction temperature; higher thermal derating margin. | Suitable for under-hood automotive or high-ambient industrial enclosures exceeding 125°C ambient. | Choose LT8390AHFE#PBF only if sustained >125°C case temperature is expected; otherwise LT8390AEFE#PBF is optimal cost/performance fit. |
Compared with LT8390AIFE#PBF and LT8390AHFE#PBF, the LT8390AEFE#PBF offers the best balance of AEC-Q100 compliance, thermal capability, and production availability for mainstream automotive and industrial 4-switch buck-boost applications - without over-specifying for extreme temperatures or under-specifying for qualification requirements.
Availability
LT8390AEFE#PBF is available at Aetrix Electronics and suitable for automotive battery management, industrial wide-input voltage regulation, and telecom backup power systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.
Supply support for LT8390AEFE#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets.
The LT8390A product line delivers high-frequency, wide-input-range synchronous buck-boost controllers optimized for automotive, industrial, and telecom applications demanding seamless voltage regulation across VIN/VOUT crossover points.
FAQ
What is the maximum switching frequency supported by the LT8390AEFE#PBF?
The LT8390AEFE#PBF supports an adjustable switching frequency from 600kHz to 2MHz via the RT pin resistor. At RT = 59.0kΩ, it operates at 2MHz (typical). This high-frequency capability enables use of sub-1µH inductors and reduces solution size - critical for space-constrained automotive and portable industrial designs. The LT8390AEFE#PBF maintains stable regulation and 95% peak efficiency even at 2MHz.
Does the LT8390AEFE#PBF support spread spectrum frequency modulation?
Yes, the LT8390AEFE#PBF supports triangle spread spectrum modulation when the SYNC/SPRD pin is tied to INTVCC. This feature spreads the fundamental switching frequency by ±25%, significantly reducing peak EMI emissions to meet CISPR-25 Class 5 requirements. Unlike basic dithering, this is a controlled, repeatable modulation scheme integrated into the oscillator architecture of the LT8390AEFE#PBF.
How does the LT8390AEFE#PBF handle transitions between buck, buck-boost, and boost modes?
The LT8390AEFE#PBF uses Analog Devices' proprietary peak-buck/peak-boost current mode control with hysteresis-based region detection. Transition thresholds (e.g., buck-boost to boost at VIN/VOUT = 0.75, buck to buck-boost at 1.25) ensure smooth, low-noise handoffs without discontinuity. The LT8390AEFE#PBF maintains continuous inductor current and stable regulation throughout all three regions - verified in typical performance curves across load and input conditions.
What is the purpose of the LOADEN and LOADTG pins on the LT8390AEFE#PBF?
The LOADEN pin enables or disables an external high-side PMOS load switch; when pulled high, it activates LOADTG - a buffered, inverted gate driver that swings from (VOUT–5V) to VOUT. This allows controlled hot-swap or system-level power sequencing. When LOADEN is low, the LT8390AEFE#PBF disables TG1/TG2, turns on BG1/BG2, and disconnects VC - ensuring safe output isolation. This function is fully integrated and validated in the LT8390AEFE#PBF's pinout and timing specs.
Is the LT8390AEFE#PBF qualified for automotive applications?
Yes, the LT8390AEFE#PBF is AEC-Q100 qualified for automotive applications (Grade E, –40°C to 125°C junction temperature). It undergoes stress testing including HTOL, TC, UHAST, and ESD per AEC standards. The "E" suffix denotes this qualification level, and the FE package (28-lead TSSOP) is explicitly listed in Analog Devices' automotive ordering table - confirming its suitability for engine control units, ADAS modules, and infotainment power supplies.
LT8390AEFE#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:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 645kHz ~ 2.1MHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT8390AEFE#PBF FAQ
1.How can I place an order for LT8390AEFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390AEFE#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 LT8390AEFE#PBF reliable?
The price and inventory of LT8390AEFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390AEFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8390AEFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390AEFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390AEFE#PBF?
LT8390AEFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390AEFE#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 LT8390AEFE#PBF?
For technical support, including LT8390AEFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390AEFE#PBF requirements.
6.How does Aetrix verify that LT8390AEFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8390AEFE#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 LT8390AEFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8390AEFE#PBF?
All LT8390AEFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390AEFE#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 LT8390AEFE#PBF part is unused and in its original packaging.
Return procedure for LT8390AEFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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