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Analog Devices Inc. LT8390EFE#TRPBF
- Part No.:
- LT8390EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390EFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 28TSS
- Quantity:
- Payment:
- Shipping:
Inventory:1,832
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Product details
Overview
LT8390EFE#TRPBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V–60V input and 0V–60V output, with ±1.5% output voltage accuracy, 150kHz–650kHz adjustable switching frequency, and AEC-Q100 qualification for automotive use. It enables seamless transitions between buck, buck-boost, and boost modes in battery charger, telecom power, and industrial voltage regulator applications.
For engineers reviewing the LT8390EFE#TRPBF datasheet, LT8390EFE#TRPBF pinout, LT8390EFE#TRPBF application, or LT8390EFE#TRPBF equivalent, key selection considerations include its peak-buck/peak-boost current mode control architecture, integrated bootstrap diodes, spread spectrum EMI reduction, high-side PMOS load switch driver, and dual current sense (LSP/LSN + ISP/ISN) capability for precise input/output current regulation.
Technical Context
The LT8390EFE#TRPBF implements a proprietary dual-mode current sensing scheme: LSP/LSN monitors inductor current for peak-buck/peak-boost control across all VIN/VOUT regions, while ISP/ISN provides independent input or output current regulation with ±3% accuracy. Its region transition thresholds (e.g., buck-to-buck-boost at VIN/VOUT = 1.16–1.20) are fixed and internally calibrated.
Control logic integrates a 2V reference (VREF), 5V internal LDO (INTVCC), error amplifier (VC), and dual gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), with dedicated LOADEN/LOADTG pins enabling external high-side PMOS load switch control and VOUT disconnection during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide-input systems including automotive cold-crank (4.5V) and industrial 48V rails. |
| VOUT Capability | 0V to 60V - enables bidirectional voltage regulation without polarity reversal hardware. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation across temperature and line/load variations. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables reliable CC/CV battery charging and input current limiting. |
| Switching Frequency | 150kHz–650kHz adjustable via RT resistor or SYNC/SPRD pin - allows EMI optimization and inductor size trade-offs. |
| Spread Spectrum | ±15% triangle modulation - reduces peak EMI by spreading energy across frequency band. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and industrial environments. |
Pinout & Package
LT8390EFE#TRPBF is housed in a 28-lead plastic TSSOP package with exposed pad (θJA = 30°C/W, θJC = 5°C/W). The exposed pad (Pin 29) is GND and must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1, BG2 | Buck/Boost bottom gate drivers | Drive N-channel MOSFETs from GND to INTVCC; enable synchronous rectification in both regions. |
| TG1, TG2 | Buck/Boost top gate drivers | Drive N-channel MOSFETs from SWx to BSTx; require external bootstrap capacitors on BST1/BST2. |
| LSP/LSN | Inductor current sense inputs | Kelvin-connected to RSENSE for accurate peak-buck/peak-boost current mode control across all operating regions. |
| ISP/ISN | Input/output current monitor inputs | Enable programmable CC regulation (e.g., battery charge current) with 10× gain on ISMON output. |
| LOADEN/LOADTG | High-side PMOS load switch control | LOADEN enables/disables external PMOS; LOADTG provides buffered inverted drive referenced to VOUT. |
| SYNC/SPRD | Frequency control input | Ground = fixed oscillator; INTVCC = ±15% spread spectrum; external clock = synchronization to system master. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters; reduces BOM count and board area in wide-VIN applications. |
| Seamless region transition | No output disturbance during VIN/VOUT crossover (e.g., automotive start-stop); avoids discontinuous regulation or re-start delays. |
| Integrated bootstrap Schottky diodes | Removes two external diodes per side; simplifies layout and improves reliability in high-reliability systems. |
| VOUT disconnect during shutdown | Prevents backfeed from output to input when disabled - critical for battery-powered systems with shared rail domains. |
| AEC-Q100 Grade E qualification | Validated for automotive applications including infotainment, ADAS power supplies, and body electronics. |
Applications
| Automotive Battery Charger | Industrial Telecom Power Supply |
|---|---|
Use Scenario: Charging 12V lead-acid or LiFePO₄ batteries from variable 6V–42V vehicle bus (e.g., start-stop, regenerative braking). IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller regulating constant-voltage/constant-current output with seamless VIN/VOUT crossover. Use Value: Maintains >95% efficiency across full input range; ±1.5% VOUT accuracy ensures battery longevity; AEC-Q100 compliance guarantees operation in harsh automotive environments. | Use Scenario: Providing isolated 48V intermediate bus from 24V/36V/48V industrial or telecom distribution rails. IC Role / Device Role / Timing Role: High-efficiency DC/DC controller driving external MOSFETs to deliver up to 60V/4A with low-noise region transitions. Use Value: 98% peak efficiency at 48W reduces thermal stress; spread spectrum minimizes conducted EMI in dense telecom chassis; 60V absolute max rating supports transient robustness. |
| High-Power Portable Equipment | Supercapacitor Backup System |
Use Scenario: Powering 5V/12V/24V subsystems in battery-powered test equipment or mobile medical devices using 2S–6S Li-ion packs (6V–26V). IC Role / Device Role / Timing Role: Wide-input buck-boost controller delivering regulated output regardless of battery state-of-charge. Use Value: Eliminates need for multiple converters or complex power path management; 4µA shutdown current extends runtime; LOADTG enables controlled load isolation. | Use Scenario: Managing charge/discharge of 27V supercapacitor banks used for ride-through during AC mains failure in industrial PLCs. IC Role / Device Role / Timing Role: Bidirectional current-regulated controller performing constant-current charge and constant-voltage discharge with precise ISP/ISN monitoring. Use Value: ±3% current accuracy ensures predictable energy transfer; seamless buck-boost transition prevents voltage droop during load step; 60V output capability matches supercapacitor stack voltage. |
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 |
|---|---|---|---|
| LT8705EFE#TRPBF | Wider 2.8V–80V input; no integrated spread spectrum; requires external current sense amp for ISP/ISN function. | Preferred for ultra-wide VIN systems (>60V) where EMI is managed externally; lacks built-in SSFM and load switch driver. | Select LT8390EFE#TRPBF when spread spectrum, LOADTG, or AEC-Q100 qualification are required; choose LT8705EFE#TRPBF for higher input voltage margin. |
| MPQ4332GQ-AEC1-Z | Monolithic 3.5A solution (integrated MOSFETs); fixed 500kHz fSW; no ISP/ISN current monitor; only 40V max VIN. | Suitable for lower-power, space-constrained designs where external FETs are undesirable; lacks programmable current regulation and wide-VOUT capability. | Choose LT8390EFE#TRPBF for >4A, >40V, or precision current regulation needs; MPQ4332 suits compact 12V–24V systems with <3.5A output. |
Compared with LT8705EFE#TRPBF and MPQ4332GQ-AEC1-Z, the LT8390EFE#TRPBF uniquely combines AEC-Q100 qualification, integrated spread spectrum, high-side load switch control, and dual current sensing - making it optimal for automotive battery chargers and industrial backup power requiring robust, low-EMI, and highly configurable regulation.
Availability
LT8390EFE#TRPBF is available at Aetrix Electronics and suitable for automotive battery charging, industrial telecom power supplies, and high-power portable equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8390EFE#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 for precision, power, and connectivity applications.
The LT8390 belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, wide-input-range DC/DC conversion in automotive, industrial, and telecom infrastructure where reliability, EMI control, and seamless mode transitions are critical.
FAQ
What is the maximum output voltage supported by the LT8390EFE#TRPBF?
The LT8390EFE#TRPBF supports an output voltage range of 0V to 60V. This capability is enabled by its 4-switch buck-boost architecture and internal circuitry rated for up to 60V absolute maximum on VOUT, ISP, ISN, and other key pins. The device maintains ±1.5% output voltage accuracy across this full range when VOUT is between 1V and 60V, making it suitable for high-voltage industrial and telecom applications where traditional buck-only or boost-only controllers fall short. The LT8390EFE#TRPBF achieves this without requiring external level-shifting or protection circuitry.
Does the LT8390EFE#TRPBF support spread spectrum frequency modulation?
Yes, the LT8390EFE#TRPBF supports internal ±15% triangle spread spectrum frequency modulation (SSFM) to reduce electromagnetic interference (EMI). When the SYNC/SPRD pin is tied to INTVCC, the device automatically applies triangle modulation around its internal oscillator frequency - for example, ±15% around 400kHz yields a 340kHz–460kHz sweep. This feature is confirmed in the datasheet's FEATURES section and Electrical Characteristics table, where "Highest Spread Spectrum Above Oscillator Frequency" is specified as 12.5–16.5% and "Lowest Spread Spectrum Below" as –17.7 to –13.7%. The LT8390EFE#TRPBF does not require external components to enable SSFM.
How does the LT8390EFE#TRPBF handle transitions between buck, buck-boost, and boost operating regions?
The LT8390EFE#TRPBF uses a proprietary peak-buck/peak-boost current mode control scheme that ensures seamless, low-noise transitions between operating regions based on the VIN/VOUT ratio. Transition thresholds are precisely defined: buck-to-buck-boost occurs at VIN/VOUT = 1.16–1.20, buck-boost-to-boost at 0.83–0.87, and peak-buck-to-peak-boost at 0.96–1.00. These boundaries are internally calibrated and do not require user configuration. During transitions, the controller dynamically adjusts duty cycles and gate drive timing to prevent output voltage disturbance or current discontinuity - a key advantage over dual-controller or hybrid solutions. This behavior is validated in the Typical Performance Characteristics section (Figures G01–G03) and Operation chapter of the LT8390EFE#TRPBF datasheet.
What is the purpose of the LOADEN and LOADTG pins on the LT8390EFE#TRPBF?
The LOADEN and LOADTG pins on the LT8390EFE#TRPBF provide dedicated control for an external high-side PMOS load switch. LOADEN is a logic-level enable input (1.3–1.5V threshold); when asserted high, it activates LOADTG - a buffered, inverted output that drives the PMOS gate from (VOUT – 5V) to VOUT. This allows clean disconnection of the output from the input during shutdown, preventing backfeed in battery-powered systems. When LOADEN is low, TG1/TG2 are disabled and BG1/BG2 are enabled, ensuring safe gate states. The LT8390EFE#TRPBF datasheet specifies LOADTG turn-on/off propagation delays (<90ns) and voltage swing ranges, confirming its suitability for fast, reliable load switching in automotive and industrial applications.
Is the LT8390EFE#TRPBF qualified for automotive applications?
Yes, the LT8390EFE#TRPBF is AEC-Q100 qualified for automotive applications. It belongs to the "E" grade variant (–40°C to +125°C operating junction temperature) and is explicitly listed in the ORDER INFORMATION table as meeting AEC-Q100 requirements. The datasheet confirms this qualification in the FEATURES section ("AEC-Q100 Qualified for Automotive Applications") and in Note 2, which states that the LT8390E is guaranteed over the full –40°C to +125°C range. This makes the LT8390EFE#TRPBF suitable for under-hood and cabin applications including battery management, infotainment power supplies, and ADAS subsystems where automotive-grade reliability and temperature resilience are mandatory.
LT8390EFE#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:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 190kHz ~ 630kHz
- 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
LT8390EFE#TRPBF FAQ
1.How can I place an order for LT8390EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390EFE#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 LT8390EFE#TRPBF reliable?
The price and inventory of LT8390EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390EFE#TRPBF?
LT8390EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390EFE#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 LT8390EFE#TRPBF?
For technical support, including LT8390EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390EFE#TRPBF requirements.
6.How does Aetrix verify that LT8390EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390EFE#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 LT8390EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390EFE#TRPBF?
All LT8390EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390EFE#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 LT8390EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8390EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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