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Analog Devices Inc. LT8390AHUFD#TRPBF
- Part No.:
- LT8390AHUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390AHUFD#TRPBF.pdf
- Description:
- 60V SYNCHRONOUS 4-SWITCH BUCK-BO
- Quantity:
- Payment:
- Shipping:
Inventory:3,524
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Product details
Overview
LT8390AHUFD#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, ±1.5% output voltage accuracy, and AEC-Q100 qualification for automotive-grade thermal operation up to 150°C junction temperature.
For engineers reviewing the LT8390AHUFD#TRPBF datasheet, LT8390AHUFD#TRPBF pinout, LT8390AHUFD#TRPBF application, or LT8390AHUFD#TRPBF equivalent, key selection criteria include VIN/VOUT region transition behavior, ISP/ISN current sense accuracy (±3%), LOADTG high-side PMOS driver capability, and QFN-28 (4mm × 5mm) package thermal performance (θJC = 3.4°C/W).
Technical Context
The LT8390AHUFD#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control, enabling seamless transitions between buck (VIN/VOUT ≤ 0.77), buck-boost (0.77 < VIN/VOUT < 1.35), and boost (VIN/VOUT ≥ 1.35) regions without audible noise or regulation discontinuity. Its dual-current-sense architecture uses LSP/LSN for inductor current and ISP/ISN for input/output current monitoring.
It integrates two independent gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), internal 5V INTVCC LDO, 2V VREF reference, and programmable fault response (hiccup/latch-off/keep-running) via SS pin resistor configuration - all operating across –40°C to 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide-input industrial and automotive battery systems including cold-crank (4.5V) and load-dump (60V) transients. |
| VOUT Range | 0V to 60V - enables bidirectional voltage regulation for supercapacitor charging, battery backup, and variable-output power supplies. |
| Switching Frequency | 600kHz to 2MHz - adjustable via RT resistor; 2MHz operation allows compact magnetics and low-profile designs. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation across temperature and line/load variations in precision applications. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables accurate input or output current limiting and telemetry in battery management and protection circuits. |
| Junction Temp Range | –40°C to 150°C - AEC-Q100 qualified (H grade); supports under-hood automotive and high-ambient industrial environments. |
| Spread Spectrum | 25% triangle modulation - reduces peak EMI by spreading switching energy across frequency band, easing EMC compliance. |
Pinout & Package
LT8390AHUFD#TRPBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed pad (Pin 29 = GND), offering θJA = 43°C/W and θJC = 3.4°C/W for high-power density thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 | Buck/Boost switch nodes | Connect to external MOSFETs; swing from Schottky drop below GND to VIN (SW1) or VOUT (SW2); require Kelvin routing for low-noise sensing. |
| TG1, BG1, TG2, BG2 | N-channel gate drivers | Drive top/bottom MOSFETs with 2.6Ω pull-up / 1.4Ω pull-down (TG) and 3.2Ω / 1.2Ω (BG); support 2MHz switching with 20–25ns rise/fall times. |
| LSP, LSN | Inductor current sense inputs | Kelvin-connected to RSENSE; enable precise peak-buck/peak-boost current mode control across all operating regions. |
| ISP, ISN | Input/output current monitor inputs | Measure system-level current with ±3% accuracy; ISMON outputs 10×(VISP–VISN) + 0.25V for analog telemetry or parallel master/slave sync. |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables external PMOS; LOADTG provides buffered inverted drive referenced to VOUT (VOUT–5V to VOUT), isolating output during shutdown. |
| FB, VC, RT, SYNC/SPRD | Voltage loop, compensation, freq. set, sync/modulation | FB regulates to 1.00V; VC sets current comparator threshold; RT sets oscillator (600kHz–2MHz); SYNC/SPRD selects sync clock or 25% SS modulation. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters; reduces BOM count, PCB area, and design complexity in wide-VIN/VOUT systems. |
| Seamless region transitions | No regulation dropout or audible artifacts when crossing buck/buck-boost/boost boundaries - critical for automotive start-stop and battery switchover. |
| Programmable fault response | SS pin resistor configures short-circuit behavior: hiccup (no resistor), latch-off (499kΩ), or keep-running (100kΩ) - enables application-specific safety logic. |
| VOUT disconnection during shutdown | When EN/UVLO < 0.3V, TG1/TG2 turn off and BG1/BG2 turn on, disconnecting VIN from VOUT - prevents backfeed and meets automotive isolation requirements. |
| Integrated 5V INTVCC LDO | Supplies internal circuitry and gate drivers from VIN; delivers 145mA typical current with 4.85–5.15V regulation - eliminates need for external bias rail. |
Applications
| Automotive Start-Stop Systems | Industrial 24V/48V Backup Power |
|---|---|
Use Scenario: Maintains stable 12V rail during engine cranking (VIN drops to 4.5V) and alternator load dump (VIN spikes to 60V). IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller regulating VOUT = 12V while monitoring input current for battery health. Use Value: ±1.5% VOUT accuracy and seamless buck→buck-boost→boost transitions prevent ECU brownouts and ensure uninterrupted CAN/LIN communication. | Use Scenario: Powers critical PLC I/O modules from either primary 24V supply or backup supercapacitor bank during mains failure. IC Role / Device Role / Timing Role: Bidirectional voltage regulator controlling charge/discharge of 24V–48V supercapacitors with ISP/ISN current monitoring. Use Value: 0V–60V VOUT capability and ±3% current sense accuracy enable precise energy metering and safe capacitor voltage clamping. |
| Telecom Remote Radio Units | High-Frequency Battery-Powered Test Equipment |
Use Scenario: Generates isolated 5V/3.3V rails from fluctuating 48V telecom battery (36–72V range) in outdoor base stations. IC Role / Device Role / Timing Role: High-frequency (2MHz) buck-boost controller minimizing inductor size while providing PGOOD flag for system sequencing. Use Value: 2MHz operation reduces magnetic volume by >50% vs 500kHz designs; PGOOD ensures clean power-up of FPGAs and RF transceivers. | Use Scenario: Powers portable oscilloscope front-end ADCs and amplifiers from Li-ion battery (3.0–4.2V) while maintaining 5V analog supply. IC Role / Device Role / Timing Role: Wide-input buck-boost controller delivering regulated 5V output with low-noise spread spectrum to minimize measurement interference. Use Value: 25% triangle spread spectrum lowers peak EMI by 10dB, preserving signal integrity in sensitive analog acquisition paths. |
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 |
|---|---|---|---|
| LT8390IUFD#TRPBF | Same architecture and pinout; rated for –40°C to 125°C junction (vs. LT8390AHUFD#TRPBF's –40°C to 150°C) | Suitable for non-automotive industrial use where ambient temperature stays below 105°C | Select LT8390AHUFD#TRPBF for under-hood automotive or high-ambient industrial deployments requiring extended thermal margin. |
| MPQ4333GSD-AEC1-Z | Monolithic 3.5A 4-switch buck-boost IC (integrated MOSFETs); fixed 500kHz–2.2MHz freq.; no ISP/ISN current monitor | Lower component count but limited to ≤3.5A; lacks programmable fault modes and high-accuracy current telemetry | Choose LT8390AHUFD#TRPBF when >3.5A output, precision current monitoring, or AEC-Q100 H-grade reliability is required. |
Compared with LT8390IUFD#TRPBF, the LT8390AHUFD#TRPBF adds 25°C higher junction rating and automotive qualification; versus MPQ4333GSD-AEC1-Z, it offers higher current scalability, external MOSFET flexibility, and full current-sense telemetry - essential for high-reliability, high-power, or diagnostic-capable systems.
Availability
LT8390AHUFD#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial backup power supplies, telecom remote radio units, and high-frequency battery-powered test equipment requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8390AHUFD#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 industrial, automotive, communications, and healthcare markets.
The LT8390A product line delivers high-efficiency, wide-VIN/VOUT synchronous 4-switch buck-boost controllers optimized for automotive-grade reliability, EMI-sensitive applications, and systems demanding seamless voltage regulation across input/output crossover conditions.
FAQ
What is the maximum junction temperature rating for the LT8390AHUFD#TRPBF?
The LT8390AHUFD#TRPBF is rated for continuous operation up to 150°C junction temperature and is AEC-Q100 qualified for automotive applications. This exceeds the 125°C rating of standard-grade variants like LT8390EUFD#TRPBF, making it suitable for under-hood environments and high-ambient industrial deployments where thermal headroom is critical. The device includes overtemperature protection that activates above 150°C.
How does the LT8390AHUFD#TRPBF handle transitions between buck, buck-boost, and boost operating regions?
The LT8390AHUFD#TRPBF uses Analog Devices' proprietary peak-buck/peak-boost current mode control to achieve seamless, low-noise transitions. Region boundaries are defined by VIN/VOUT ratios: buck (≤0.77), buck-boost (0.77–1.35), and boost (≥1.35). Hysteresis prevents chattering, and the single inductor current sense (LSP/LSN) ensures continuous regulation without output droop or audible artifacts during crossover - verified in typical applications at 2MHz switching.
Can the LT8390AHUFD#TRPBF monitor both input and output current simultaneously?
Yes, the LT8390AHUFD#TRPBF supports independent input or output current monitoring via the ISP/ISN pins, with ±3% accuracy across temperature. The ISMON pin outputs a voltage equal to 10×(VISP–VISN) + 0.25V, enabling analog telemetry or master-slave synchronization in parallel configurations. For input current monitoring, connect ISP/ISN in series with VIN; for output current, place them in series with VOUT - the controller automatically adapts based on operating region.
What fault protection features does the LT8390AHUFD#TRPBF provide during output short-circuit conditions?
The LT8390AHUFD#TRPBF offers three configurable fault responses during output short-circuit: hiccup mode (no SS resistor), latch-off (499kΩ from SS to GND), or keep-running (100kΩ from SS to GND). It also detects short-circuit via FB voltage falling below 0.25V and provides PGOOD flag deassertion. These protections are fully operational across the –40°C to 150°C junction range and do not require external components beyond the SS resistor.
Is the LT8390AHUFD#TRPBF pin-compatible with other LT8390A variants in the QFN package?
Yes, all LT8390A variants in the UFD (4mm × 5mm QFN-28) package - including LT8390AHUFD#TRPBF, LT8390AIUFD#TRPBF, and LT8390AEUFD#TRPBF - share identical pinout, footprint, and electrical interface. The only differences are temperature grade (H = –40°C to 150°C, I = –40°C to 125°C, E = –40°C to 125°C) and AEC-Q100 qualification status. This allows direct substitution in existing layouts when upgrading thermal or automotive compliance requirements.
LT8390AHUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT8390AHUFD#TRPBF FAQ
1.How can I place an order for LT8390AHUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390AHUFD#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 LT8390AHUFD#TRPBF reliable?
The price and inventory of LT8390AHUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390AHUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390AHUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390AHUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390AHUFD#TRPBF?
LT8390AHUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390AHUFD#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 LT8390AHUFD#TRPBF?
For technical support, including LT8390AHUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390AHUFD#TRPBF requirements.
6.How does Aetrix verify that LT8390AHUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390AHUFD#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 LT8390AHUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390AHUFD#TRPBF?
All LT8390AHUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390AHUFD#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 LT8390AHUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT8390AHUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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