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Analog Devices Inc. LT8390EFE
- Part No.:
- LT8390EFE
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390EFE.pdf
- Description:
- IC REG CTRLR BUCK/BOOST
- Quantity:
- Payment:
- Shipping:
Inventory:1,977
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Product details
Overview
LT8390EFE from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V to 60V input and 0V to 60V output, with ±1.5% output voltage accuracy, 150kHz–650kHz adjustable switching frequency, and AEC-Q100 qualification for automotive systems. It enables seamless buck/buck-boost/boost transitions in battery charger, telecom power, and industrial voltage regulator applications.
For engineers reviewing the LT8390EFE datasheet, LT8390EFE pinout, LT8390EFE application, or LT8390EFE equivalent, key selection considerations include its peak-buck/peak-boost current mode control, integrated bootstrap diodes, spread spectrum EMI reduction, high-side PMOS load switch driver, and 28-lead TSSOP package with exposed pad for thermal management.
Technical Context
The LT8390EFE implements a proprietary dual-mode current sensing architecture using a single inductor sense resistor (LSP/LSN) to support continuous operation across buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT) regions. Its region transition thresholds are precisely defined: buck-to-buck-boost at VIN/VOUT = 1.16–1.20, buck-boost-to-boost at 0.73–0.77.
Control logic integrates two independent gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), internal 5V INTVCC LDO, 2V VREF reference, and programmable fault response (retry/latch-off/keep-running) during output short-circuit events. Spread spectrum modulation is enabled via SYNC/SPRD pin tied to INTVCC, delivering ±15% triangle frequency deviation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range automotive battery (cold crank to load dump) and industrial DC bus inputs. |
| Output Voltage Range | 0V to 60V - enables bidirectional regulation for supercapacitor charging and battery backup systems. |
| Switching Frequency | 150kHz to 650kHz - adjustable via RT resistor; synchronizable externally or modulated with ±15% spread spectrum for EMI compliance. |
| Output Voltage Accuracy | ±1.5% over –40°C to 125°C - ensures stable regulation in automotive under-hood environments. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables precise input/output current limiting and telemetry in battery management. |
| Package | 28-Lead TSSOP with exposed pad - θJC = 5°C/W enables high-power operation up to 48W with minimal heatsinking. |
| AEC-Q100 Grade | Grade E (–40°C to 125°C junction) - qualified for automotive infotainment, ADAS power supplies, and body electronics. |
Pinout & Package
LT8390EFE is housed in a 28-lead plastic TSSOP package with exposed thermal pad (Pin 29 = GND). The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. θJA = 30°C/W, θJC = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1, BG2 | Buck/Boost bottom gate drivers | Drive N-channel MOSFETs from GND to INTVCC; enable synchronous rectification for >98% efficiency. |
| TG1, TG2 | Buck/Boost top gate drivers | Drive N-channel MOSFETs from SWx to BSTx; require external bootstrap capacitors for high-side operation. |
| LSP / LSN | Inductor current sense inputs | Kelvin-connected terminals for accurate inductor current measurement across all operating regions. |
| ISP / ISN | Input/output current monitor inputs | Support bidirectional current sensing with ±1mV reverse threshold and 10× ISMON scaling. |
| LOADEN / LOADTG | High-side PMOS load switch control | Enable/disable external PMOS FET; LOADTG provides buffered inverted drive referenced to VOUT. |
| SYNC/SPRD | Frequency control input | GND = fixed frequency; 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 + boost converters; reduces BOM count and board area by >40% vs dual-stage solutions. |
| Proprietary peak-buck/peak-boost current mode | Ensures stable, low-noise transitions between operating regions without output voltage droop or overshoot. |
| Integrated bootstrap Schottky diodes | Removes requirement for external bootstrap diodes; simplifies layout and improves reliability in high-vibration environments. |
| VOUT-disconnected-from-VIN during shutdown | Prevents backfeed from output to input rail; critical for battery-powered systems with multiple power domains. |
| Programmable fault protection | Hiccup, latch-off, or keep-running response to output short-circuit - configurable via SS pin resistor network. |
Applications
| Automotive Battery Charger | Industrial Telecom Power Supply |
|---|---|
Use Scenario: Charging 12V lead-acid or LiFePO₄ batteries from variable 9V–60V vehicle bus (engine running, cranking, stop-start). IC Role / Device Role / Timing Role: Buck-boost controller regulating constant-current/constant-voltage charge profile with input current limiting and thermal foldback. Use Value: Seamless VIN/VOUT crossover avoids charging interruption during engine start; ±3% current accuracy enables precise C-rate control. |
Use Scenario: Generating stable 48V intermediate bus from 36V–60V telecom rectifier output or PoH backplane. IC Role / Device Role / Timing Role: High-efficiency voltage regulator with spread spectrum EMI reduction meeting EN55022 Class B limits. Use Value: 98% efficiency at 4A/12V minimizes heat in dense rack-mounted equipment; AEC-Q100 qualification supports extended field life. |
| Supercapacitor Backup System | High-Power Portable Equipment |
Use Scenario: Bidirectional power transfer between 24V system rail and 0–24V supercapacitor bank for ride-through during AC failure. IC Role / Device Role / Timing Role: Regulating both charge (buck-boost) and discharge (boost) paths with identical current-sense accuracy and fast transient response. Use Value: Single-inductor topology eliminates polarity-reversal switching losses; ±1.5% VOUT accuracy maintains tight capacitor voltage window. |
Use Scenario: Powering 12V/4A loads (e.g., portable medical imaging, test equipment) from 10.8V–25.2V Li-ion battery packs. IC Role / Device Role / Timing Role: Wide-input buck-boost controller enabling full battery voltage range utilization without brownout. Use Value: 4V minimum VIN extends runtime by 15–20% vs 5V-limited controllers; 28-TSSOP package fits compact handheld enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8705EFE#PBF | Wider 2.8V–80V input; no integrated spread spectrum; requires external bootstrap diodes. | Preferred for ultra-wide input industrial systems where EMI is less constrained. | Choose LT8705EFE when input exceeds 60V or when external bootstrap diode placement is acceptable for layout flexibility. |
| MPQ4333GL-AEC1-Z | 3.3V–40V input; 20V max output; QFN-24; no ISP/ISN current monitor or LOADTG driver. | Suitable for cost-sensitive automotive auxiliary rails where full 60V capability and bidirectional current sensing are unnecessary. | Choose MPQ4333GL-AEC1-Z only for lower-power (<20W), lower-voltage automotive modules with simplified feature set. |
Compared with LT8705EFE and MPQ4333GL-AEC1-Z, the LT8390EFE uniquely combines 60V operation, integrated spread spectrum, ISP/ISN current monitoring, and high-side load switch control in a single AEC-Q100-qualified package-making it optimal for next-generation automotive and industrial power systems requiring robustness, precision, and EMI compliance.
Availability
LT8390EFE is available at Aetrix Electronics and suitable for automotive battery chargers, industrial telecom power supplies, and high-power portable equipment requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LT8390EFE 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 automotive, industrial, communications, and healthcare markets.
The LT8390 product line delivers high-efficiency, wide-input-range buck-boost controllers optimized for automotive and industrial applications demanding seamless voltage crossover, precise current regulation, and AEC-Q100 reliability.
FAQ
What is the maximum output current supported by the LT8390EFE?
The LT8390EFE itself does not define a fixed maximum output current-it is a controller IC whose output current capability depends on external MOSFET selection, inductor sizing, and thermal design. In the typical 48W (12V/4A) application shown in the datasheet, the LT8390EFE achieves 98% efficiency. With appropriate external components and PCB thermal management, designs exceeding 5A are feasible. Always verify thermal performance using θJC = 5°C/W and ensure peak inductor current stays within MOSFET SOA limits.
Does the LT8390EFE support both input and output current regulation?
Yes, the LT8390EFE supports both input and output current regulation via dedicated ISP/ISN pins. When configured for input current limit, it regulates current drawn from VIN; when configured for output current limit, it regulates current delivered to VOUT. The CTRL pin sets the current threshold (5mV–100mV full scale), and ISMON provides a 10× scaled voltage output for monitoring. Accuracy is ±3% over temperature, enabling precise battery charge/discharge control in the LT8390EFE.
How does the LT8390EFE handle transitions between buck, buck-boost, and boost modes?
The LT8390EFE uses a proprietary peak-buck/peak-boost current mode control scheme with hard-coded region transition thresholds: buck-to-buck-boost at VIN/VOUT = 1.16–1.20, buck-boost-to-boost at 0.73–0.77. These transitions occur seamlessly without output disturbance, thanks to continuous current sensing on the single inductor and coordinated gate timing. No external circuitry or mode-select pins are required-the LT8390EFE automatically selects the optimal operating region based on real-time VIN/VOUT ratio.
Is the LT8390EFE pin-compatible with other members of the LT8390 family?
Yes, the LT8390EFE shares identical pinout and footprint with all LT8390 variants in the 28-lead TSSOP package (e.g., LT8390IFE, LT8390JFE), differing only in temperature grade and screening. This allows drop-in replacement across grades without PCB redesign. However, the LT8390EUFD (QFN) variant has a different pin mapping and is not pin-compatible-the LT8390EFE requires verification against the TSSOP-specific pin diagram in Rev. D datasheet.
What fault protection features are built into the LT8390EFE?
The LT8390EFE includes comprehensive fault protection: output short-circuit detection with user-selectable response (hiccup, latch-off, or keep-running); FB overvoltage (1.08–1.12V) and short-circuit (0.24–0.26V) thresholds; thermal shutdown; and PGOOD flag assertion only when VFB is within ±10% of regulation. All protections operate across the full –40°C to 125°C range, and fault status can be monitored via ISMON and PGOOD pins-critical for safety-critical automotive and industrial use of the LT8390EFE.
LT8390EFE 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:
- Obsolete
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT8390EFE FAQ
1.How can I place an order for LT8390EFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390EFE 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 reliable?
The price and inventory of LT8390EFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390EFE is usually 5 days.
3.What payment methods are accepted for LT8390EFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390EFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390EFE?
LT8390EFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390EFE 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?
For technical support, including LT8390EFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390EFE requirements.
6.How does Aetrix verify that LT8390EFE is sourced from the original manufacturer or authorized distributors?
All LT8390EFE 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 meets industry standards.
7.What is the process for return or replacement of LT8390EFE?
All LT8390EFE units undergo pre-shipment inspection (PSI). If there is an issue with LT8390EFE, 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 part is unused and in its original packaging.
Return procedure for LT8390EFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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