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Analog Devices Inc. LT8390EFE#PBF
- Part No.:
- LT8390EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390EFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 28TSS
- Quantity:
- Payment:
- Shipping:
Inventory:9,216
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Product details
Overview
LT8390EFE#PBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V–60V input and 0V–60V output, regulating voltage or input/output current with ±1.5% VOUT accuracy (1V–60V), ±3% current sense accuracy, and up to 98% efficiency in 48W (12V/4A) configurations. It enables seamless transitions between buck, buck-boost, and boost modes for automotive battery regulation and industrial power supplies.
For engineers reviewing the LT8390EFE#PBF datasheet, LT8390EFE#PBF pinout, LT8390EFE#PBF application, or LT8390EFE#PBF equivalent, key selection criteria include its spread-spectrum EMI reduction, AEC-Q100 qualification, 28-lead TSSOP package with exposed pad, and support for both input and output current monitoring in wide-input-range systems.
Technical Context
The LT8390EFE#PBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN), enabling smooth region transitions without audible noise or output disturbance. Its dual-path error amplifier architecture independently regulates VFB (1.00 V reference) and ISP/ISN current sense signals via VC and CTRL pins.
It supports three fault protection modes-hiccup, latch-off, or keep-running-configured via SS pin resistor, and integrates high-side PMOS load switch control (LOADEN/LOADTG) with 4.6–5.6 V gate drive swing referenced to VOUT, while maintaining VIN-to-VOUT isolation during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4 V to 60 V - supports 12 V, 24 V, and 48 V automotive and industrial rails without pre-regulation |
| VOUT Range | 0 V to 60 V - enables bidirectional voltage regulation and supercapacitor charging |
| Output Voltage Accuracy | ±1.5% over 1 V ≤ VOUT ≤ 60 V - ensures stable feedback loop performance across full range |
| Current Sense Accuracy | ±3% for input or output current monitoring - critical for battery charge/discharge control and safety compliance |
| Switching Frequency | 150 kHz to 650 kHz (adjustable via RT) or ±15% spread spectrum - reduces EMI peak emissions by >10 dB |
| Efficiency | Up to 98% at 12 V/4 A - minimizes thermal stress in compact 28-lead TSSOP packages with θJA = 30°C/W |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments |
Pinout & Package
LT8390EFE#PBF is housed in a 28-lead plastic TSSOP package with exposed pad (Pin 29 = GND), requiring soldering of the exposed pad to PCB ground for thermal and electrical integrity (θJA = 30°C/W, θJC = 5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage feedback input | Regulates VOUT to 1.00 V reference; triggers PGOOD and fault protection when out of ±10% window |
| ISP / ISN | Differential current sense inputs | Kelvin-connected to RSENSE for ±3% accurate input/output current measurement and CC/CV control |
| TG1 / BG1 / SW1 / BST1 | Buck-side gate drivers and switch node | Controls external N-MOSFETs in buck path; integrated bootstrap diode on BST1 reduces BOM count |
| TG2 / BG2 / SW2 / BST2 | Boost-side gate drivers and switch node | Drives boost-side FETs; BST2 tied to INTVCC with external capacitor enables high-side NMOS switching |
| LOADEN / LOADTG | High-side PMOS load switch interface | Enables/disables external PMOS; LOADTG swings from (VOUT–5 V) to VOUT, allowing direct gate drive without level shifter |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters - reduces board area and component count in space-constrained systems |
| Spread-spectrum frequency modulation | ±15% triangle modulation around oscillator frequency - lowers conducted and radiated EMI without external filters |
| Seamless region transition | No output glitch or audible noise when crossing VIN/VOUT = 0.75–1.35 boundaries - essential for battery-powered systems with varying SoC |
| Integrated bootstrap diodes | Removes two external Schottky diodes per side - simplifies layout and improves reliability in high-vibration environments |
| AEC-Q100 Grade E qualification | Validated for automotive applications including engine control units and ADAS power supplies - meets stress test requirements at –40°C to +125°C |
Applications
| Automotive Battery Regulator | Industrial 24V/48V Power Supply |
|---|---|
Use Scenario: Maintaining stable 12 V or 24 V rail from a LiFePO₄ or lead-acid battery whose voltage varies from 9 V (discharged) to 16 V (charged), while supporting cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller regulating output voltage and limiting input current during cranking; uses ISP/ISN for real-time battery current monitoring. Use Value: Enables single-stage conversion without pre- or post-regulators, reducing system cost and improving efficiency over 90% across full battery voltage range. | Use Scenario: Providing regulated 24 V output from unregulated 36–60 V telecom rectifier or industrial DC bus, with programmable current limit for motor driver or PLC I/O modules. IC Role / Device Role / Timing Role: High-efficiency DC/DC controller operating in buck-boost region; RT pin sets 400 kHz switching to balance efficiency and EMI in dense PCB layouts. Use Value: Delivers up to 48 W (2 A @ 24 V) with <100 mV output ripple and <10 µs transient response - meets EN 61000-3-2 harmonic limits. |
| Supercapacitor Charger/Discharger | High-Power Portable Equipment |
Use Scenario: Charging/discharging 16 V/50 F supercapacitor bank from a 12 V vehicle battery or 24 V industrial source, with precise CV/CC control and reverse-current blocking. IC Role / Device Role / Timing Role: Bidirectional controller using ISP/ISN for charge current regulation and FB for voltage clamp; LOADTG disconnects VOUT from VIN during shutdown. Use Value: Achieves <±1.5% VOUT and <±3% ICHG accuracy over temperature - extends supercapacitor lifetime and prevents overvoltage failure. | Use Scenario: Powering portable test equipment with variable input (USB PD, 12 V adapter, or internal Li-ion) and fixed 5 V/3.3 V outputs, requiring low quiescent current and robust EMI performance. IC Role / Device Role / Timing Role: Primary buck-boost regulator with spread spectrum enabled via SYNC/SPRD tied to INTVCC; EN/UVLO provides clean enable sequencing. Use Value: Quiescent current <2.8 µA in shutdown and <2.1 mA in no-switching mode - extends battery runtime in standby. |
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 |
|---|---|---|---|
| LT8708EFE#PBF | Wider VIN range (2.8 V–80 V); no integrated spread spectrum; requires external current sense amp for ISP/ISN monitoring | Lacks AEC-Q100 qualification and built-in current monitor output (ISMON); suited for non-automotive high-voltage industrial use | Select when input voltage exceeds 60 V or when external current sensing flexibility is required over integrated ISMON functionality |
| MPQ4333GQ-AEC1-Z | 4-switch buck-boost controller with integrated gate drivers but no ISP/ISN current monitor; max VIN/VOUT = 36 V; no spread spectrum | Lower voltage rating and missing input/output current regulation capability; limited to 12 V/24 V automotive infotainment | Choose only for cost-sensitive, lower-power (<20 W) AEC-Q100 applications where current monitoring is handled externally |
Compared with LT8708EFE#PBF and MPQ4333GQ-AEC1-Z, the LT8390EFE#PBF uniquely combines AEC-Q100 qualification, integrated ISP/ISN current monitoring with ISMON output, ±15% spread spectrum, and seamless buck/buck-boost/boost transitions - making it the only option for automotive battery management and high-accuracy industrial CV/CC power supplies.
Availability
LT8390EFE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial 24V/48V power supplies, and supercapacitor charger applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8390EFE#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, industrial automation, and automotive markets.
The LT8390 product line was designed specifically for high-reliability, wide-input-range DC/DC conversion in automotive and industrial environments - emphasizing seamless mode transitions, integrated diagnostics, and EMI-optimized operation without external components.
FAQ
What is the maximum output voltage supported by the LT8390EFE#PBF?
The LT8390EFE#PBF supports an output voltage range of 0 V to 60 V, with ±1.5% regulation accuracy maintained across 1 V ≤ VOUT ≤ 60 V. This allows direct regulation of 12 V, 24 V, and 48 V systems, as well as supercapacitor charging up to 60 V. The device does not regulate below 0 V - negative output configurations require external circuitry.
Does the LT8390EFE#PBF support both input and output current regulation?
Yes, the LT8390EFE#PBF supports both input and output current regulation via its ISP/ISN differential current sense inputs. With ±3% accuracy over temperature, it enables precise constant-current battery charging, input current limiting during cold-crank, or output current limiting for motor drives. The ISMON pin provides a buffered 10×(VISP–VISN) + 0.25 V output for monitoring or cascading.
How is spread-spectrum modulation enabled on the LT8390EFE#PBF?
Spread-spectrum modulation on the LT8390EFE#PBF is enabled by tying the SYNC/SPRD pin to INTVCC, which activates ±15% triangle frequency modulation around the internal oscillator frequency set by the RT resistor. This reduces EMI peak emissions without requiring external clock sources or complex filtering - a key advantage over fixed-frequency alternatives like the LT8708EFE#PBF.
What package type and thermal characteristics does the LT8390EFE#PBF use?
The LT8390EFE#PBF uses a 28-lead plastic TSSOP package with exposed pad (Pin 29 = GND). Its thermal resistance is θJA = 30°C/W and θJC = 5°C/W when the exposed pad is properly soldered to a PCB ground plane. This enables reliable operation up to 125°C junction temperature in high-power 48 W applications without forced airflow.
Is the LT8390EFE#PBF qualified for automotive applications?
Yes, the LT8390EFE#PBF is AEC-Q100 qualified for automotive applications (Grade E, –40°C to +125°C). It undergoes rigorous stress testing including HTOL, TC, and ESD per AEC standards. Its integrated features - such as input undervoltage lockout with hysteresis, output short-circuit protection, and seamless buck-boost transitions - meet functional safety requirements for engine control, body electronics, and ADAS power domains.
LT8390EFE#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:
- 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#PBF FAQ
1.How can I place an order for LT8390EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390EFE#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 LT8390EFE#PBF reliable?
The price and inventory of LT8390EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8390EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390EFE#PBF?
LT8390EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390EFE#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 LT8390EFE#PBF?
For technical support, including LT8390EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390EFE#PBF requirements.
6.How does Aetrix verify that LT8390EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8390EFE#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 LT8390EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8390EFE#PBF?
All LT8390EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390EFE#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 LT8390EFE#PBF part is unused and in its original packaging.
Return procedure for LT8390EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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