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Analog Devices Inc. LT8390AIFE#TRPBF
- Part No.:
- LT8390AIFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390AIFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 28
- Quantity:
- Payment:
- Shipping:
Inventory:4,582
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Product details
Overview
LT8390AIFE#TRPBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V–60V input and 0V–60V output, operating at up to 2MHz with ±1.5% VOUT accuracy, spread-spectrum EMI reduction, and AEC-Q100 qualification for automotive systems. It regulates voltage or input/output current in single-inductor architectures where VIN may be above, below, or equal to VOUT.
For engineers reviewing the LT8390AIFE#TRPBF datasheet, LT8390AIFE#TRPBF pinout, LT8390AIFE#TRPBF application, or LT8390AIFE#TRPBF equivalent, key selection factors include its peak-buck/peak-boost current mode control, seamless region transitions (buck/buck-boost/boost), integrated high-side PMOS load switch driver, and dual current sense monitoring (ISP/ISN and LSP/LSN) for battery charging and industrial power supply designs.
Technical Context
The LT8390AIFE#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current mode architecture, using a single inductor and two independent current sense paths (LSP/LSN for inductor current, ISP/ISN for input/output current) to enable continuous regulation across all three operating regions. Its control logic dynamically selects between four states-peak-buck in buck, peak-buck in buck-boost, peak-boost in buck-boost, and peak-boost in boost-based on real-time VIN/VOUT ratio with hysteresis to prevent mode chatter.
It integrates dual bootstrap drivers (BST1/BST2), gate drivers for four external NMOS switches (TG1/BG1/TG2/BG2), a 5V INTVCC LDO, 2V VREF reference, and programmable fault responses (hiccup/latch-off/keep-running) via SS pin resistor configuration. The SYNC/SPRD pin supports either external clock synchronization or internal 25% triangle spread-spectrum modulation.
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 and supercapacitor charging without polarity reversal |
| Switching Frequency | 600kHz to 2MHz (adjustable via RT resistor) - allows compact magnetics and noise-sensitive high-frequency layout |
| VOUT 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 battery charge/discharge current control in CC/CV stages |
| Spread Spectrum | 25% triangle modulation - reduces peak EMI by >10dB without external filtering components |
| Operating Temp | –40°C to +125°C (I-grade) - qualified per AEC-Q100 Grade I for automotive front-end and infotainment power rails |
Pinout & Package
LT8390AIFE#TRPBF is housed in a 28-lead TSSOP package with exposed pad (FE package), thermally optimized for high-power DC/DC applications. The exposed pad (Pin 29) must be soldered directly to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO | Enable and input undervoltage lockout input | Configurable UVLO threshold (1.220V falling) with 2.5µA pull-down for precise input brown-in/out control |
| FB | Voltage feedback input | Regulates output to 1.00V reference; triggers PGOOD and fault protection when deviating beyond ±10% |
| ISP/ISN | Input/output current sense differential pair | Monitors input or output current with Kelvin connection; supports ±750mV overcurrent detection |
| LSP/LSN | Inductor current sense differential pair | Provides primary current mode control signal; enables accurate peak-current limiting in all operation regions |
| TG1/BG1/TG2/BG2 | NMOS gate drivers | Drive external high-side/low-side FETs with 2.6Ω pull-up / 1.4Ω pull-down resistance and <25ns switching times |
| LOADEN/LOADTG | High-side PMOS load switch control | Enables/disables external PMOS with inverted buffered drive; disconnects VOUT from VIN during shutdown |
| SYNC/SPRD | Frequency sync or spread-spectrum select | Ground = fixed frequency; INTVCC = 25% SS modulation; external clock = synchronizable operation |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor buck-boost topology | Eliminates need for separate buck and boost converters; reduces BOM count and board space in multi-rail systems |
| Seamless region transition | No output disturbance during VIN/VOUT crossover (e.g., 12V battery dropping to 9V while powering 12V load) |
| Programmable fault response | Hiccup, latch-off, or continuous operation during short-circuit - selected via SS pin resistor (no firmware required) |
| Dual current sensing | Independent ISP/ISN (input/output) and LSP/LSN (inductor) paths enable true constant-current battery charging with reverse-current protection |
| AEC-Q100 Grade I qualification | Validated for automotive use including temperature cycling, HTOL, and ESD testing - suitable for ADAS and body electronics |
Applications
| Automotive Front-End Power Supply | Battery Management System (BMS) Charger |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery (4V–60V transient range) to stable 5V/3.3V for infotainment and ADAS ECUs during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Primary buck-boost controller managing input-to-output conversion with seamless buck→buck-boost→boost transitions as battery voltage fluctuates. Use Value: Maintains uninterrupted power delivery without output droop or restart glitches, meeting ISO 16750-2 pulse test requirements. |
Use Scenario: Charging 12V–48V Li-ion/LiFePO₄ battery packs from variable solar or vehicle alternator sources with precise CC/CV control. IC Role / Device Role / Timing Role: Dual-loop controller regulating both output voltage (via FB) and charge current (via ISP/ISN) with ±3% accuracy across temperature. Use Value: Enables full-featured battery charging without secondary current-sense amplifiers or microcontroller-based loop management. |
| Industrial 24V DC Bus Converter | Telecom Remote Radio Unit (RRU) Power |
Use Scenario: Converting unregulated 18V–57V industrial DC bus to isolated 12V/5V rails for PLC I/O modules and sensors in harsh factory environments. IC Role / Device Role / Timing Role: High-efficiency (up to 95% @ 2MHz) buck-boost controller with spread-spectrum EMI reduction to meet CISPR 11 Class A limits. Use Value: Passes conducted/radiated emissions tests without added ferrite beads or shielding, reducing system cost and validation time. |
Use Scenario: Providing regulated 28V/48V output from fluctuating -48V telecom rectifier input in outdoor base station RRUs with wide ambient temperature range. IC Role / Device Role / Timing Role: AEC-Q100 qualified controller operating reliably from –40°C to +125°C junction temperature with thermal foldback protection. Use Value: Eliminates need for derating or external thermal management, enabling smaller heatsinks and higher power density in sealed 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 |
|---|---|---|---|
| LT8390EFE#TRPBF | Same architecture and pinout, but rated for 0°C to 125°C (not –40°C); no AEC-Q100 qualification | Suitable only for commercial/industrial ambient environments, not automotive under-hood | Select LT8390AIFE#TRPBF for automotive or extended-temp industrial use; LT8390EFE#TRPBF for cost-sensitive non-automotive designs |
| MPQ4333G-AEC1-P | Monolithic 3.5A 36V buck-boost converter (integrated FETs); lower max input (36V vs 60V), no ISP/ISN current monitor | Limited to lower-power applications (<25W); lacks dual current sensing and programmable fault modes | Choose MPQ4333G-AEC1-P for space-constrained, low-complexity designs; LT8390AIFE#TRPBF for high-power, precision current-controlled systems |
Compared with LT8390EFE#TRPBF, the LT8390AIFE#TRPBF adds –40°C startup capability and AEC-Q100 compliance for automotive deployment; versus MPQ4333G-AEC1-P, it delivers higher voltage/power scalability, dual current sensing, and flexible external FET control - critical for battery charging and ruggedized power systems.
Availability
LT8390AIFE#TRPBF is available at Aetrix Electronics and suitable for automotive front-end supplies, battery management chargers, industrial 24V DC bus converters, and telecom RRU power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8390AIFE#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, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LT8390A series belongs to Analog Devices' Power by Linear™ portfolio of high-efficiency DC/DC controllers, designed specifically for demanding automotive and industrial applications requiring wide input range, seamless buck-boost operation, and robust fault handling.
FAQ
What is the maximum input voltage rating for the LT8390AIFE#TRPBF?
The LT8390AIFE#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin, with transient tolerance up to 56V continuous and 63V for short-duration events. This enables direct connection to 48V automotive systems and industrial DC buses without external clamping, provided proper layout and input capacitance are used per the datasheet guidelines.
Does the LT8390AIFE#TRPBF support spread-spectrum EMI reduction?
Yes, the LT8390AIFE#TRPBF supports internal 25% triangle spread-spectrum frequency modulation when the SYNC/SPRD pin is tied to INTVCC. This feature spreads switching energy across a 25% bandwidth around the nominal oscillator frequency, significantly reducing peak radiated and conducted EMI without requiring additional filtering components.
How does the LT8390AIFE#TRPBF handle transitions between buck, buck-boost, and boost modes?
The LT8390AIFE#TRPBF uses proprietary peak-buck/peak-boost current mode control with hysteresis-based region detection. It automatically transitions between modes based on real-time VIN/VOUT ratio - e.g., buck-boost to boost at VIN/VOUT ≈ 0.85, and buck to buck-boost at VIN/VOUT ≈ 1.25 - with no output disturbance or control-loop instability due to seamless state switching and dedicated comparators.
Can the LT8390AIFE#TRPBF regulate both voltage and current simultaneously?
Yes, the LT8390AIFE#TRPBF supports dual-loop regulation: constant-voltage via the FB pin (targeting 1.00V) and constant-current via the ISP/ISN differential input (programmable from 5mV to 100mV full-scale). This enables true CC/CV battery charging profiles without external op-amps or microcontroller intervention.
What package type and thermal performance does the LT8390AIFE#TRPBF use?
The LT8390AIFE#TRPBF uses a 28-lead TSSOP package with exposed pad (FE), offering θJA = 30°C/W and θJC = 5°C/W. The exposed pad must be soldered to a large PCB ground plane to achieve rated thermal performance and sustain continuous operation with junction temperature below 125°C at full load in typical layouts.
LT8390AIFE#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:
- 645kHz ~ 2.1MHz
- 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
LT8390AIFE#TRPBF FAQ
1.How can I place an order for LT8390AIFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390AIFE#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 LT8390AIFE#TRPBF reliable?
The price and inventory of LT8390AIFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390AIFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390AIFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390AIFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390AIFE#TRPBF?
LT8390AIFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390AIFE#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 LT8390AIFE#TRPBF?
For technical support, including LT8390AIFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390AIFE#TRPBF requirements.
6.How does Aetrix verify that LT8390AIFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390AIFE#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 LT8390AIFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390AIFE#TRPBF?
All LT8390AIFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390AIFE#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 LT8390AIFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8390AIFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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