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Analog Devices Inc. LT8390IFE
- Part No.:
- LT8390IFE
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390IFE.pdf
- Description:
- IC REG CTRLR BUCK/BOOST
- Quantity:
- Payment:
- Shipping:
Inventory:4,813
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Product details
Overview
LT8390IFE 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, 98% peak efficiency, and AEC-Q100 qualification for automotive systems. It enables seamless transitions between buck, buck-boost, and boost modes in battery charger, telecom power, and industrial regulator applications.
For engineers reviewing the LT8390IFE datasheet, LT8390IFE pinout, LT8390IFE application, or LT8390IFE equivalent, this page delivers verified technical context, validated pin functions, confirmed spread-spectrum EMI reduction, real-world region-transition thresholds, and precise current-sense accuracy specs - all tied explicitly to the LT8390IFE#WTRPBF ordering variant.
Technical Context
The LT8390IFE implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN) and dual independent current comparators. It dynamically selects operating mode based on VIN/VOUT ratio - buck (VIN/VOUT ≥ 1.33), buck-boost (0.75 ≤ VIN/VOUT ≤ 1.18), or boost (VIN/VOUT ≤ 0.85) - with hysteresis to prevent chattering at boundaries.
It integrates two bootstrap drivers (BST1/BST2), four gate drivers (TG1/BG1/TG2/BG2), an internal 5V LDO (INTVCC), 2V reference (VREF), and programmable fault response (retry/latch-off/keep-running). Spread spectrum modulation (±15% triangle) is enabled by tying SYNC/SPRD to INTVCC, reducing peak EMI without external components.
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 true buck-boost regulation across full range, including VOUT = VIN operation. |
| VOUT Regulation Accuracy | ±1.5% over –40°C to 125°C - ensures stable feedback loop performance in harsh thermal environments. |
| Switching Frequency | 150kHz to 650kHz adjustable via RT resistor; ±15% spread spectrum when SYNC/SPRD = INTVCC - reduces conducted EMI peaks. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables precise input or output current regulation for battery charging and load protection. |
| Operating Junction Temp | –40°C to 125°C - qualified for under-hood automotive and industrial ambient conditions. |
| Package | 28-Lead TSSOP with exposed pad - provides low θJC = 5°C/W thermal resistance for high-power density layouts. |
Pinout & Package
LT8390IFE is housed in a 28-lead plastic TSSOP package with exposed thermal pad (Pin 29 = GND), optimized for thermal dissipation in high-current DC/DC designs. The exposed pad must be soldered directly to PCB ground plane per datasheet requirement.
| 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 with bootstrapped swing (SWx to BSTx); support high-side switching without external high-voltage drivers. |
| LSP / LSN | Buck-side inductor current sense inputs | Kelvin-connected terminals for accurate RSENSE measurement; used for peak-buck current mode and reverse current detection. |
| ISP / ISN | Input/output current sense inputs | Kelvin-connected terminals for bidirectional current monitoring; feed into programmable current comparator with CTRL scaling. |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables external PMOS; LOADTG provides buffered inverted drive referenced to VOUT - isolates output during shutdown. |
| SYNC/SPRD | Frequency control input | GND = fixed frequency; INTVCC = ±15% triangle spread spectrum; external clock = synchronization - no additional IC needed for EMI compliance. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck + boost converters; reduces BOM count, board area, and magnetic component count by >40% vs dual-stage solutions. |
| Seamless buck/buck-boost/boost transition | Region boundaries defined by VIN/VOUT ratios (e.g., buck-boost to boost at 0.75–0.77) with hysteresis - prevents output disturbance during input transients. |
| Integrated bootstrap diodes (BST1/BST2) | Removes need for external Schottky diodes; simplifies layout and improves reliability in high-temp automotive environments. |
| Programmable fault response | Three short-circuit modes (hiccup/latch-off/keep-running) selected via SS-to-VREF resistor - enables system-level safety tailoring without firmware. |
| VOUT disconnection during shutdown | LOADTG turns off external PMOS when LOADEN is low - prevents backfeed and meets ISO 16750-2 load dump isolation requirements. |
Applications
| Automotive Front-End Power Supply | Industrial 24V/48V Battery Charger |
|---|---|
Use Scenario: Regulating 12V/24V battery input to stable 5V/12V/15V rail for ADAS ECUs under cold-crank (4.5V) and load-dump (60V) conditions. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller maintaining constant output despite wide VIN variation and transient events. Use Value: Eliminates need for pre-regulator + post-regulator stages; achieves 98% efficiency at 4A/12V while meeting AEC-Q100 Grade I temp range. |
Use Scenario: Charging 24V lead-acid or LiFePO₄ battery from variable solar or generator source with input ranging 18V–60V. IC Role / Device Role / Timing Role: Input-current-regulated buck-boost controller with ISP/ISN sensing and programmable CC/CV profile via CTRL pin. Use Value: ±3% input current accuracy enables precise charge termination; spread spectrum reduces EMI during high-current bulk charge phase. |
| Telecom 48V Intermediate Bus Converter | High-Power Portable Equipment Supply |
Use Scenario: Generating isolated 12V/5V rails from 48V telecom backplane where input may dip below or exceed output during brownouts or hot-swap events. IC Role / Device Role / Timing Role: Wide-input buck-boost controller with PGOOD flag and fault latching for system-level power sequencing and watchdog integration. Use Value: Seamless mode transition avoids output dropout during 48V sag to 36V; ±1.5% VOUT accuracy maintains tight regulation for sensitive SerDes supplies. |
Use Scenario: Powering portable test equipment with 12V nominal battery (7V–14.4V) while delivering regulated 5V/3.3V/15V outputs up to 4A. IC Role / Device Role / Timing Role: Single-chip buck-boost solution enabling compact, fanless design with minimal external magnetics. Use Value: 28-lead TSSOP with exposed pad supports >4W dissipation at 125°C ambient; integrated bootstrap diodes reduce component count and improve MTBF. |
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 |
|---|---|---|---|
| LT8391IFE#WTRPBF | Includes integrated 5V/200mA bias supply for gate drivers; eliminates need for external INTVCC capacitor; same pinout and control logic. | Reduces external component count in space-constrained designs; better suited for systems lacking dedicated 5V rail. | Select LT8391IFE when minimizing external capacitors and simplifying layout is prioritized over marginal cost difference. |
| MPQ4333AGL-AEC1-Z | 3.5V–60V input, 0.8V–28V output; lower max output voltage; no spread spectrum; only buck-boost mode (no pure buck/boost). | Limited to mid-range VOUT applications; lacks seamless transition and ISP/ISN current monitoring capability. | Choose MPQ4333 for cost-sensitive automotive modules where VOUT ≤ 28V and EMI requirements are less stringent. |
Compared with LT8390IFE, LT8391IFE adds integrated bias supply but shares identical control architecture and pin compatibility, while MPQ4333AGL-AEC1-Z offers lower BOM cost at the expense of reduced feature set, narrower output range, and no spread spectrum.
Availability
LT8390IFE is available at Aetrix Electronics and suitable for automotive front-end power supplies, industrial battery chargers, and telecom intermediate bus converters requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for LT8390IFE 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 electronics markets.
The LT8390 family was designed specifically for high-reliability, wide-input-range DC/DC conversion in automotive and industrial environments - emphasizing seamless mode transition, robust fault handling, and integrated EMI mitigation without external complexity.
FAQ
What is the maximum output current capability of the LT8390IFE?
The LT8390IFE itself does not define maximum output current - it is a controller IC. Its 4-switch architecture supports continuous output currents up to 6.7A (based on IOUT LIMIT specification), depending on external MOSFET selection, inductor sizing, and thermal design. Typical reference designs achieve 4A at 12V with 98% efficiency using standard 28-lead TSSOP layout and copper pour.
Does the LT8390IFE support spread spectrum frequency modulation?
Yes, the LT8390IFE supports triangle spread spectrum frequency modulation with ±15% deviation around the programmed oscillator frequency. This is enabled by connecting the SYNC/SPRD pin to INTVCC. The feature is fully integrated - no external clock source or configuration registers are required - and reduces peak EMI emissions without impacting regulation performance.
How does the LT8390IFE handle input voltage transients such as automotive load dump?
The LT8390IFE tolerates up to 60V on VIN, ISP, ISN, and VOUT pins per Absolute Maximum Ratings. During a 60V/100ms load dump event, its internal protection circuitry remains functional, and the controller continues regulating if thermal limits are respected. External TVS clamping and proper input capacitance are still recommended to ensure reliable operation beyond absolute max ratings.
Can the LT8390IFE regulate input current instead of output voltage?
Yes, the LT8390IFE supports input current regulation via the ISP/ISN pins and CTRL pin programming. By configuring the current sense threshold through CTRL voltage (0.3V–1.35V), the device regulates input current with ±3% accuracy across temperature - essential for battery charging, solar MPPT, or input-limited power sources.
What is the purpose of the LOADEN and LOADTG pins on the LT8390IFE?
LOADEN is a logic input that controls an internal high-side PMOS load switch driver. When LOADEN is high, LOADTG drives the external PMOS gate with a voltage swing referenced to VOUT (up to VOUT – 5V). When LOADEN is low, LOADTG turns off, disconnecting VOUT from VIN - preventing backfeed and enabling safe hot-swap or standby isolation in the LT8390IFE design.
LT8390IFE 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
LT8390IFE FAQ
1.How can I place an order for LT8390IFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390IFE 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 reliable?
The price and inventory of LT8390IFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390IFE is usually 5 days.
3.What payment methods are accepted for LT8390IFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390IFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390IFE?
LT8390IFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390IFE 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?
For technical support, including LT8390IFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390IFE requirements.
6.How does Aetrix verify that LT8390IFE is sourced from the original manufacturer or authorized distributors?
All LT8390IFE 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 meets industry standards.
7.What is the process for return or replacement of LT8390IFE?
All LT8390IFE units undergo pre-shipment inspection (PSI). If there is an issue with LT8390IFE, 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 part is unused and in its original packaging.
Return procedure for LT8390IFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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