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Analog Devices Inc. LT8390IFE#TRPBF
- Part No.:
- LT8390IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 28TSS
- Quantity:
- Payment:
- Shipping:
Inventory:1,405
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Product details
Overview
LT8390IFE#TRPBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting input voltages from 4V to 60V and output voltages from 0V to 60V, with ±1.5% output voltage accuracy (1V–60V), adjustable 150kHz–650kHz switching frequency, and integrated spread spectrum for EMI reduction. It enables seamless transitions between buck, buck-boost, and boost modes and is used in automotive battery chargers and industrial power supplies requiring wide VIN/VOUT flexibility.
For engineers reviewing the LT8390IFE#TRPBF datasheet, LT8390IFE#TRPBF pinout, LT8390IFE#TRPBF application, or LT8390IFE#TRPBF equivalent, key selection considerations include its peak-buck/peak-boost current mode control architecture, 28-lead TSSOP package with exposed pad, AEC-Q100 qualification for automotive use, ±3% input/output current monitoring accuracy, and fault protection modes (hiccup/latch-off/keep-running) during short-circuit events.
Technical Context
The LT8390IFE#TRPBF implements a proprietary dual-mode current sensing scheme using a single inductor current sense resistor (LSP/LSN) and separate high-side current monitor (ISP/ISN), enabling precise regulation of input or output current across all operating regions. Its control logic dynamically selects between peak-buck and peak-boost current mode based on real-time VIN/VOUT ratio - with defined transition thresholds at 0.75 (buck→buck-boost), 0.85 (buck-boost→boost), 1.18 (buck→buck-boost), and 1.33 (buck-boost→boost).
It integrates two independent gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), internal bootstrap diodes for BST1/BST2, and a high-side PMOS load switch driver (LOADTG) with 4.6V–5.6V on-voltage at VOUT = 12V. The device supports external synchronization or triangle spread spectrum modulation via the SYNC/SPRD pin and features soft-start timing controlled by an external capacitor on SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports direct connection to 12V/24V/48V automotive and industrial rails without pre-regulation. |
| VOUT Range | 0V to 60V - enables bidirectional voltage conversion for battery charging, supercapacitor balancing, and wide-output applications. |
| Output Voltage Accuracy | ±1.5% over 1V ≤ VOUT ≤ 60V - ensures stable regulation across full output range without trimming. |
| Switching Frequency | 150kHz to 650kHz, adjustable via RT resistor or external sync clock - allows layout optimization for size vs. efficiency trade-offs. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - supports accurate input/output current limiting and telemetry in battery management systems. |
| Efficiency | Up to 98% at 48W (12V/4A) - minimizes thermal stress and enables compact heatsink-free designs in space-constrained systems. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and industrial environments with extended thermal margin. |
Pinout & Package
LT8390IFE#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 |
|---|---|---|
| FB | Voltage feedback input | Regulates output to 1.00V reference; enables CV operation and FB-based overvoltage/short-circuit protection. |
| ISP / ISN | High-side current sense inputs | Supports ±750mV overcurrent detection and 10× scaled analog monitor output (ISMON) for system telemetry. |
| LSP / LSN | Buck-side inductor current sense | Enables peak-current mode control across all regions using single Kelvin-connected sense resistor. |
| TG1 / BG1 / SW1 / BST1 | Buck-side NMOS gate drive chain | Drives external high-side and low-side N-channel MOSFETs; integrated bootstrap diode reduces component count. |
| TG2 / BG2 / SW2 / BST2 | Boost-side NMOS gate drive chain | Independent boost-side driver set enables true 4-switch operation without shared switch node limitations. |
| LOADEN / LOADTG | High-side PMOS load switch control | Allows controlled disconnect of VOUT from load during shutdown or fault; LOADTG swings from (VOUT–5V) to VOUT. |
| SYNC/SPRD | Frequency control interface | Ground = fixed frequency; INTVCC = ±15% triangle spread spectrum; external clock = synchronization up to 650kHz. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor topology | Eliminates need for separate buck and boost converters; reduces BOM cost and board area in wide-input-range systems. |
| Seamless region transition | No output disturbance during VIN/VOUT crossover - critical for automotive start-stop and battery backup systems. |
| Integrated spread spectrum | Reduces peak EMI by >10dB without external filters; meets CISPR 25 Class 5 requirements in automotive designs. |
| AEC-Q100 Grade I | Qualified for automotive applications (-40°C to +125°C); includes enhanced reliability testing and traceable manufacturing. |
| Programmable fault response | Hiccup, latch-off, or continuous operation during short-circuit - configurable via single resistor on SS pin. |
Applications
| Automotive Battery Charger | Industrial Wide-Input Power Supply |
|---|---|
Use Scenario: Charging 12V lead-acid or LiFePO₄ batteries from variable vehicle bus (6V–40V during cold crank or alternator surge). IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller regulating constant voltage/current while maintaining >95% efficiency across full input range. Use Value: Eliminates need for pre-regulator stage; supports ISO 16750-2 pulse testing with no output dropout during 4V brownout. | Use Scenario: Powering 24V PLC I/O modules from unregulated factory 36V–60V DC distribution rail. IC Role / Device Role / Timing Role: Primary DC/DC controller delivering regulated 24V output with input current limit and PGOOD signaling for system supervision. Use Value: Maintains regulation during 60V transients; ±3% current accuracy enables precise load current monitoring for predictive maintenance. |
| Telecom 48V Backup System | High-Power Portable Equipment |
Use Scenario: Bidirectional power path between 48V telecom rectifier and supercapacitor bank for ride-through during AC failure. IC Role / Device Role / Timing Role: Buck-boost controller managing charge/discharge with seamless mode transition and reverse current blocking. Use Value: Enables <100ns switchover between grid and cap power; integrated ISP/ISN sensing replaces discrete current shunt amplifier. | Use Scenario: Powering 12V FPGA and RF subsystems from 2S–5S Li-ion battery (6V–21V) in portable test equipment. IC Role / Device Role / Timing Role: Single-chip solution providing stable 12V output with programmable soft-start and load switch isolation. Use Value: Reduces bill-of-materials by 7 components vs. discrete buck+boost; LOADTG enables safe hot-swap of downstream modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8705IFE#TRPBF | Wider 2.8V–80V input range; no integrated spread spectrum; requires external current sense amp for ISP/ISN function. | Preferred for ultra-low-VIN applications (e.g., 3.3V backup rails); lacks AEC-Q100 qualification. | Select when input may dip below 4V or when higher VIN tolerance is required; verify external sensing circuitry for current monitoring. |
| MPQ4332GRE-A-Z | 3.3V–40V input; integrated MOSFETs (40V/5A); fixed 500kHz frequency; no ISP/ISN monitor or spread spectrum. | Suitable for lower-power (<25W), cost-sensitive consumer applications; not rated for automotive temperature range. | Choose for simplified design with integrated FETs where power level and temperature range allow; not drop-in compatible due to different pinout and feature set. |
Compared with LT8390IFE#TRPBF, LT8705IFE#TRPBF offers broader VIN capability but requires more external components for current monitoring, while MPQ4332GRE-A-Z integrates power stages but sacrifices programmability, EMI performance, and automotive qualification - making LT8390IFE#TRPBF optimal for high-reliability, wide-range, and EMI-sensitive applications.
Availability
LT8390IFE#TRPBF is available at Aetrix Electronics and suitable for automotive battery management, industrial power supplies, telecom backup systems, and high-power portable equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT8390IFE#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and connectivity applications.
The LT8390IFE#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive, industrial, and telecom power conversion where wide input/output range, low EMI, and robust fault handling are essential.
FAQ
What is the maximum output current capability of the LT8390IFE#TRPBF?
The LT8390IFE#TRPBF itself does not deliver output current directly - it is a controller IC that drives external MOSFETs. Its current sense architecture supports up to 6.7A output current limit (based on 100mV full-scale ISP/ISN threshold and typical 15mΩ sense resistor), enabling designs like the 48W (12V/4A) reference circuit. Actual output current depends on selected external FETs, inductor, and thermal design.
Does the LT8390IFE#TRPBF support both buck and boost operation simultaneously?
No - the LT8390IFE#TRPBF operates in one region at a time (buck, buck-boost, or boost), but transitions seamlessly between them as VIN/VOUT ratio changes. Its peak-buck/peak-boost current mode control automatically selects the appropriate mode without interruption, ensuring continuous regulation during input or load transients - for example, crossing from VIN = 14V → VOUT = 12V (buck) to VIN = 10V → VOUT = 12V (boost) without output glitch.
How is spread spectrum enabled on the LT8390IFE#TRPBF?
Spread spectrum is enabled by connecting the SYNC/SPRD pin to INTVCC (5V), which activates internal ±15% triangle modulation around the oscillator frequency set by the RT resistor. This reduces EMI peak emissions without requiring external clock sources or complex filtering. Grounding SYNC/SPRD disables spread spectrum and locks operation to the fixed RT-set frequency.
What package type and thermal characteristics does the LT8390IFE#TRPBF use?
The LT8390IFE#TRPBF 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. The exposed pad must be soldered to a solid PCB ground plane to achieve specified junction-to-case performance and ensure reliable operation at full load in high-temperature environments.
Is the LT8390IFE#TRPBF pin-compatible with other members of the LT8390 family?
Yes - all LT8390 variants (E/I/J/H grades in FE and UFD packages) share identical pinouts and footprint. The LT8390IFE#TRPBF (TSSOP, –40°C to +125°C) is mechanically and electrically compatible with LT8390EFE#TRPBF and LT8390JFE#TRPBF, differing only in temperature grade and screening. No PCB redesign is needed when upgrading or substituting within the same package type.
LT8390IFE#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
LT8390IFE#TRPBF FAQ
1.How can I place an order for LT8390IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390IFE#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 LT8390IFE#TRPBF reliable?
The price and inventory of LT8390IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390IFE#TRPBF?
LT8390IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390IFE#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 LT8390IFE#TRPBF?
For technical support, including LT8390IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390IFE#TRPBF requirements.
6.How does Aetrix verify that LT8390IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390IFE#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 LT8390IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390IFE#TRPBF?
All LT8390IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390IFE#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 LT8390IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8390IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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