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Analog Devices Inc. LT8390AEFE#TRPBF
- Part No.:
- LT8390AEFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390AEFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 28
- Quantity:
- Payment:
- Shipping:
Inventory:815
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Product details
Overview
LT8390AEFE#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 spread spectrum EMI reduction. It delivers ±1.5% VOUT accuracy (1V–60V), ±3% current sense accuracy, and 95% efficiency at 48W (12V/4A) in automotive voltage regulator and battery charger applications.
For engineers reviewing the LT8390AEFE#TRPBF datasheet, LT8390AEFE#TRPBF pinout, LT8390AEFE#TRPBF application, or LT8390AEFE#TRPBF equivalent, key selection criteria include VIN/VOUT crossover operation, peak-buck/peak-boost current mode control, AEC-Q100 qualification, 28-lead TSSOP package with exposed pad, and programmable fault response (hiccup/latch-off/keep-running).
Technical Context
The LT8390AEFE#TRPBF implements Analog Devices' proprietary dual-mode current sensing architecture: peak-buck control dominates when VIN/VOUT ≤ 0.87, peak-boost when VIN/VOUT ≥ 1.23, with seamless buck-boost transition between 0.85–1.25. Its internal 5V LDO (INTVCC) powers gate drivers and logic, while independent ISP/ISN and LSP/LSN current sense inputs enable precise input/output current regulation and reverse-current detection.
Operation spans three regions-buck (VIN ≫ VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN ≪ VOUT)-with region transitions controlled by measured VIN/VOUT ratio and validated hysteresis thresholds (e.g., buck-to-buck-boost at 1.23–1.27). The controller supports external synchronization (600kHz–2.1MHz) or internal spread-spectrum modulation (±25% triangle) to suppress EMI peaks without sacrificing regulation stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide automotive battery transients (cold crank to load dump) and industrial 24V/48V rails. |
| Output Voltage Range | 0V to 60V - enables bidirectional regulation for supercapacitor charging and battery backup systems. |
| Switching Frequency | 600kHz to 2MHz adjustable via RT resistor - allows high-frequency layout compactness or low-frequency efficiency optimization. |
| VOUT Accuracy | ±1.5% over 1V–60V - ensures stable reference for sensitive analog loads and precision power sequencing. |
| Current Sense Accuracy | ±3% for ISP/ISN and LSP/LSN paths - critical for accurate battery charge/discharge current monitoring and protection. |
| Operating Temp Range | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments. |
| Package | 28-lead TSSOP with exposed pad - provides thermal performance (θJC = 5°C/W) and PCB assembly compatibility. |
Pinout & Package
LT8390AEFE#TRPBF is housed in a 28-lead plastic TSSOP package (FE) with exposed pad (Pin 29), which must be soldered 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 output to 1.00V reference; triggers PGOOD and fault protection (OV/UV) based on ±10% threshold window. |
| ISP / ISN | High-side current sense differential inputs | Monitor input current or output current (depending on configuration); support Kelvin sensing for ±3% accuracy. |
| LSP / LSN | Buck-side inductor current sense differential inputs | Enable peak-buck current mode control and reverse-current detection in buck/buck-boost modes. |
| TG1 / BG1 / BST1 / SW1 | Buck-side gate drive and switch node | Drive external N-channel MOSFETs in buck topology; BST1 supplies floating gate drive for TG1. |
| TG2 / BG2 / BST2 / SW2 | Boost-side gate drive and switch node | Drive external N-channel MOSFETs in boost topology; BST2 supplies floating gate drive for TG2. |
| LOADEN / LOADTG | High-side PMOS load switch control | Enables/disables external PMOS FET; LOADTG provides inverted, buffered gate drive referenced to VOUT. |
| SYNC/SPRD | Frequency control select | Ground = fixed frequency; INTVCC = ±25% triangle spread spectrum; external clock = synchronization. |
| PGOOD | Open-drain power-good flag | Asserts low when FB is within ±10% of target - used for system power sequencing and fault indication. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters; reduces BOM count and board space in VIN/VOUT crossover applications. |
| Proprietary peak-buck/peak-boost current mode | Ensures stable, jitter-free transitions between buck, buck-boost, and boost regions without audible noise or regulation glitches. |
| Spread spectrum frequency modulation | Reduces peak EMI by >10dB across conducted and radiated bands - meets CISPR 25 Class 5 without added shielding. |
| AEC-Q100 Grade E qualification | Validated for automotive use (–40°C to +125°C), including HTOL, TC, and ESD testing per stress test plan. |
| Programmable short-circuit response | Configurable hiccup, latch-off, or continuous operation via SS pin resistor - enables system-level fault strategy alignment. |
| VOUT-disconnected shutdown | Isolates output from input during disable - prevents backfeed and supports hot-swap or battery isolation requirements. |
Applications
| Automotive Front-End Power Supply | Industrial 24V/48V Battery Charger |
|---|---|
Use Scenario: Regulating 12V/24V battery rail to stable 5V/3.3V for ADAS camera modules and infotainment head units amid cold-crank (4.5V) and load-dump (60V) transients. IC Role / Device Role / Timing Role: Primary buck-boost controller managing VIN/VOUT crossover, providing constant-voltage regulation with fast transient response and EMI suppression. Use Value: Maintains uninterrupted power during engine start-stop cycles and eliminates need for pre-regulator stages, reducing system cost and footprint. |
Use Scenario: Charging 24V LiFePO₄ battery packs from variable solar or generator sources ranging from 18V to 56V. IC Role / Device Role / Timing Role: Constant-current/constant-voltage (CC/CV) battery charger controller using ISP/ISN for precise charge current regulation and FB for voltage termination. Use Value: Achieves ±3% charge current accuracy and ±1.5% voltage accuracy across full temperature range, enabling safe, high-efficiency charging without external DACs or op-amps. |
| Telecom 48V Backup System | High-Frequency Portable Medical PSU |
Use Scenario: Providing uninterrupted 48V output from either primary AC/DC supply or backup supercapacitor bank during mains failure. IC Role / Device Role / Timing Role: Bidirectional buck-boost controller operating in both step-down (AC/DC → 48V) and step-up (supercap → 48V) modes with seamless switchover. Use Value: Enables zero-interruption power transfer between sources using single inductor and four external FETs - no relay or OR-ing required. |
Use Scenario: Powering portable ultrasound or patient monitor electronics from 12V lithium battery while maintaining strict EMI limits in clinical environments. IC Role / Device Role / Timing Role: High-frequency (2MHz) DC/DC controller with spread spectrum modulation to meet FCC Part 15 Class B radiated emissions without ferrite beads or metal cans. Use Value: Reduces filter component count by 40% versus fixed-frequency designs and enables ultra-thin PCB stackups for handheld enclosures. |
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 |
|---|---|---|---|
| LT8390IFE#TRPBF | Same silicon, –40°C to +125°C grade with identical electrical specs and pinout. | No functional difference; differs only in test screening and documentation traceability for industrial use cases. | Select when full industrial-grade qualification (no automotive AEC-Q100) is sufficient and cost sensitivity is higher. |
| LT8390AJFE#TRPBF | Same functionality with extended junction temperature rating (–40°C to +150°C) and tighter thermal derating. | Suitable for under-hood automotive locations exceeding 125°C ambient (e.g., near exhaust manifolds). | Choose when operating junction temperature exceeds 125°C; requires updated thermal design but offers same control features. |
Compared with LT8390IFE#TRPBF and LT8390AJFE#TRPBF, the LT8390AEFE#TRPBF provides the optimal balance of AEC-Q100 compliance, thermal margin, and cost for mainstream automotive front-end and industrial battery systems - avoiding over-specification while guaranteeing reliability in demanding environments.
Availability
LT8390AEFE#TRPBF is available at Aetrix Electronics and suitable for automotive front-end power supplies, industrial battery chargers, and telecom backup systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8390AEFE#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 automotive, industrial, communications, and healthcare markets.
The LT8390A product line delivers high-efficiency, high-frequency 4-switch buck-boost controllers designed specifically for automotive voltage regulation, battery charging, and industrial power systems where input voltage may fall above, below, or equal to output voltage.
FAQ
What is the maximum switching frequency supported by the LT8390AEFE#TRPBF?
The LT8390AEFE#TRPBF supports an adjustable switching frequency from 600kHz to 2MHz using an external RT resistor. At RT = 59.0kΩ, it operates at up to 2MHz (typical 2000kHz), enabling compact magnetics and reduced output ripple in space-constrained designs. Frequency synchronization to external clocks up to 2.1MHz is also supported via the SYNC/SPRD pin.
Does the LT8390AEFE#TRPBF support both input and output current regulation?
Yes, the LT8390AEFE#TRPBF supports precise input current regulation via the ISP/ISN pins and inductor current regulation via the LSP/LSN pins. Both paths deliver ±3% accuracy over temperature and line, enabling robust CC/CV battery charging, input current limiting for solar harvesters, and reverse-current protection in backup systems.
How does the LT8390AEFE#TRPBF handle transitions between buck, buck-boost, and boost modes?
The LT8390AEFE#TRPBF uses a proprietary peak-buck/peak-boost current mode architecture with hysteresis-controlled region transitions. Buck-to-buck-boost occurs at VIN/VOUT = 1.23–1.27, buck-boost-to-boost at 0.83–0.87, and peak-buck-to-peak-boost at 0.96–1.04 - ensuring glitch-free, low-noise transitions without output disturbance or control loop instability.
Is the LT8390AEFE#TRPBF AEC-Q100 qualified, and what grade does it meet?
Yes, the LT8390AEFE#TRPBF is AEC-Q100 qualified as Grade E (–40°C to +125°C junction temperature). It undergoes full automotive stress testing including HTOL, temperature cycling, and ESD per AEC-Q100 Rev H, making it suitable for engine control units, ADAS power supplies, and other under-hood automotive applications.
Can the LT8390AEFE#TRPBF drive external PMOS load switches, and how is this configured?
Yes, the LT8390AEFE#TRPBF integrates a dedicated high-side PMOS load switch driver via LOADEN and LOADTG pins. Applying a logic-high signal to LOADEN turns on LOADTG, which drives the gate of an external PMOS FET with a swing from (VOUT – 5V) to VOUT. This enables controlled power sequencing, hot-swap capability, and output isolation during shutdown.
LT8390AEFE#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
LT8390AEFE#TRPBF FAQ
1.How can I place an order for LT8390AEFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390AEFE#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 LT8390AEFE#TRPBF reliable?
The price and inventory of LT8390AEFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390AEFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390AEFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390AEFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390AEFE#TRPBF?
LT8390AEFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390AEFE#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 LT8390AEFE#TRPBF?
For technical support, including LT8390AEFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390AEFE#TRPBF requirements.
6.How does Aetrix verify that LT8390AEFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390AEFE#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 LT8390AEFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390AEFE#TRPBF?
All LT8390AEFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390AEFE#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 LT8390AEFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8390AEFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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