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Analog Devices Inc. LT8390HUFD#TRPBF
- Part No.:
- LT8390HUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390HUFD#TRPBF.pdf
- Description:
- 60V SYNCHRONOUS 4-SWITCH BUCK-BO
- Quantity:
- Payment:
- Shipping:
Inventory:4,252
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Product details
Overview
LT8390HUFD#TRPBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V–60V input and 0V–60V output, delivering up to 98% efficiency in 48W (12V/4A) configurations. It features ±1.5% output voltage accuracy, spread-spectrum EMI reduction, and seamless buck/buck-boost/boost region transitions-used in automotive battery chargers, industrial power supplies, and telecom voltage regulators.
For engineers reviewing the LT8390HUFD#TRPBF datasheet, LT8390HUFD#TRPBF pinout, LT8390HUFD#TRPBF application, or LT8390HUFD#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 4mm × 5mm QFN-28 package with exposed thermal pad, –40°C to 150°C junction temperature rating, and support for both input/output current regulation with ±3% accuracy.
Technical Context
The LT8390HUFD#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN), enabling continuous conduction across VIN/VOUT ratios from 0.73 to 1.35 without audible noise or discontinuity. Its dual gate drivers (TG1/BG1 and TG2/BG2) support N-channel MOSFETs on all four switches with integrated bootstrap diodes and shoot-through protection.
It integrates a 5V INTVCC LDO, 2V VREF reference, and independent error amplifier (VC) for loop compensation, while the CTRL pin enables programmable ISP/ISN current limit from 5mV to 100mV. Spread spectrum modulation (±12.5% to ±16.5%) is activated via SYNC/SPRD tied 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 sources including automotive batteries (9V–16V), industrial rails (24V/48V), and supercapacitor stacks. |
| Output Voltage Range | 0V to 60V - enables bidirectional regulation, battery charging, and voltage inversion without polarity reversal hardware. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT resistor or external sync clock) - balances efficiency, size, and EMI for compact high-power designs. |
| Output Voltage Accuracy | ±1.5% over –40°C to 150°C - ensures stable regulation in harsh environments without calibration. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables precise input/output current limiting and telemetry in battery management systems. |
| Efficiency | Up to 98% at 12V/4A - minimizes thermal stress and enables high-density layouts in space-constrained applications. |
| Operating Junction Temp | –40°C to 150°C - qualified per AEC-Q100 Grade H, suitable for under-hood automotive and industrial edge computing. |
Pinout & Package
LT8390HUFD#TRPBF uses a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND), θJA = 43°C/W, θJC = 3.4°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Primary power source determining buck/buck-boost/boost operating region; requires ≥1µF local ceramic bypass. |
| VOUT | Output supply rail | Regulated output node; also serves as high-side drive rail for LOADTG; requires ≥1µF local ceramic bypass. |
| LSP / LSN | Buck-side inductor current sense | Kelvin-connected inputs for accurate RSENSE measurement; enable reverse-current detection and valley-current monitoring. |
| ISP / ISN | Input/output current sense | Dedicated differential inputs for system-level current regulation (e.g., battery charge/discharge current limiting). |
| TG1 / BG1 / BST1 / SW1 | Buck-side gate drive chain | Drive external N-MOSFETs (top/bottom); BST1 includes integrated Schottky diode; SW1 connects to inductor node. |
| TG2 / BG2 / BST2 / SW2 | Boost-side gate drive chain | Drive external N-MOSFETs (top/bottom); BST2 includes integrated Schottky diode; SW2 connects to inductor node. |
| FB | Voltage feedback input | Regulates output to 1.00V reference; triggers PGOOD and fault protection (OV/UV) when deviating >±10%. |
| CTRL | Current limit programming | Analog input scaling ISP/ISN threshold from 5mV to 100mV; enables adaptive current limiting without digital interface. |
| SYNC/SPRD | Frequency control | GND = fixed frequency; INTVCC = ±15% triangle spread spectrum; external clock = synchronization to system master. |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables external PMOS; LOADTG provides buffered inverted gate drive referenced to VOUT. |
| PGOOD | Open-drain status flag | Pulled low when FB is within ±10% of target; requires external pull-up; used for sequencing and system health monitoring. |
| SS | Soft-start timing | Capacitor-to-ground sets ramp time; resistor-to-VREF configures short-circuit response (hiccup/latch-off/run-through). |
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 50% vs dual-stage solutions. |
| Seamless region transition | No output glitch or audible noise during VIN/VOUT crossover (e.g., cold-cranking 6V → 14V in automotive); maintains regulation across 0.73–1.35 VIN/VOUT ratio. |
| Integrated bootstrap diodes | Removes two external Schottky diodes per side; simplifies layout, improves reliability, and reduces footprint in high-vibration environments. |
| AEC-Q100 Grade H qualification | Validated for automotive under-hood operation up to 150°C junction; includes HTOL, TC, ESD, and EM test reports per AEC standard. |
| Spread-spectrum EMI reduction | ±12.5% to ±16.5% frequency dithering lowers peak radiated emissions by >10dB without filter redesign or shielding. |
| Independent input/output current monitoring | Separate ISP/ISN and LSP/LSN paths allow simultaneous battery charge current (input) and system load current (output) regulation in portable power banks. |
Applications
| Automotive Battery Charger | Industrial 48V Power Supply |
|---|---|
|
Use Scenario: Charging 12V lead-acid or LiFePO₄ battery from variable 24V–60V vehicle bus during engine-off or regenerative braking. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller regulating constant-current/constant-voltage charge profile with input current limiting. Use Value: Maintains full 4A charge current even at 24V input → 12V output (buck), 36V → 12V (buck-boost), and 12V → 12V (crossover), eliminating voltage droop during start-stop cycles. |
Use Scenario: Generating stable 12V/4A auxiliary rail from unregulated 36V–57V industrial 48V distribution bus with high transient immunity. IC Role / Device Role / Timing Role: Primary DC/DC controller managing dynamic load steps up to 4A with <100µs response and <50mV overshoot. Use Value: 98% peak efficiency reduces heatsink requirements; ±1.5% output accuracy ensures compatibility with downstream 12V logic and sensors without post-regulation. |
| Telecom 48V Backup System | High-Power Portable Power Bank |
|
Use Scenario: Bidirectional power conversion between 48V telecom rectifier and 48V lithium-ion backup battery, supporting grid-fail switchover and battery recharging. IC Role / Device Role / Timing Role: Dual-role controller enabling regulated discharge (boost: battery→bus) and charge (buck: bus→battery) with shared inductor and MOSFETs. Use Value: Single-chip solution replaces discrete buck+boost controllers; seamless mode transition prevents communication interruption during AC loss events. |
Use Scenario: High-capacity USB PD power bank delivering 20V/3A output from 3S–4S Li-ion pack (9V–16.8V), requiring step-up and step-down capability. IC Role / Device Role / Timing Role: Core voltage regulator implementing programmable current limits (via CTRL) for USB PD compliance and battery protection. Use Value: ±3% ISP/ISN current accuracy enables precise CC/CV battery charging; spread spectrum meets FCC Class B conducted EMI limits without added filters. |
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 |
|---|---|---|---|
| LT8705IUFD#TRPBF | Fixed 150kHz–600kHz range; no spread spectrum; lower max input (80V); no ISP/ISN current monitor. | Suited for cost-sensitive industrial supplies where EMI filtering is handled externally and only output regulation is required. | Choose LT8705IUFD#TRPBF if ISP/ISN monitoring and EMI reduction are unnecessary and wider input voltage (up to 80V) is needed. |
| MPQ4333GL-AEC1-Z | 3.5V–36V input; 5A max; integrated MOSFETs; no spread spectrum; no independent ISP/ISN path. | Targeted at compact automotive infotainment rails where integration and small size outweigh flexibility and precision monitoring. | Choose MPQ4333GL-AEC1-Z for space-constrained AEC-Q100 designs needing fully integrated 5A solution below 36V input. |
Compared with LT8390HUFD#TRPBF, LT8705IUFD#TRPBF offers higher input voltage tolerance but lacks current monitoring and EMI suppression, while MPQ4333GL-AEC1-Z trades external FET flexibility and precision sensing for smaller footprint and lower BOM count.
Availability
LT8390HUFD#TRPBF is available at Aetrix Electronics and suitable for automotive battery management systems, industrial 48V power supplies, and telecom backup systems requiring stable component supply, AEC-Q100 qualification, and high-temperature operation.
Supply support for LT8390HUFD#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 LT8390HUFD#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, wide-input-range DC/DC conversion in thermally demanding and EMI-sensitive applications.
FAQ
What is the maximum junction temperature rating for the LT8390HUFD#TRPBF?
The LT8390HUFD#TRPBF is rated for operation up to 150°C junction temperature and is qualified per AEC-Q100 Grade H. This makes it suitable for under-hood automotive applications and high-ambient industrial environments where thermal derating must be minimized. The device includes internal overtemperature protection that activates above 150°C to prevent permanent damage.
Does the LT8390HUFD#TRPBF support both input and output current regulation?
Yes, the LT8390HUFD#TRPBF supports independent input and output current regulation via dedicated ISP/ISN pins, with ±3% accuracy across temperature. This enables precise battery charge current control (input) and system load current limiting (output) in applications like portable power banks and telecom backup systems.
How does spread spectrum operation work on the LT8390HUFD#TRPBF?
Spread spectrum on the LT8390HUFD#TRPBF is enabled by tying the SYNC/SPRD pin to INTVCC, which activates ±15% triangle modulation around the programmed oscillator frequency. This dithers switching edges to reduce peak EMI by up to 10dB without altering loop stability or requiring additional filtering components.
Can the LT8390HUFD#TRPBF operate with VIN equal to VOUT?
Yes, the LT8390HUFD#TRPBF operates seamlessly when VIN equals VOUT (e.g., 12V in → 12V out), transitioning through buck-boost region with no output disturbance. Its proprietary peak-buck/peak-boost control ensures continuous regulation and minimal ripple during crossover, critical for automotive start-stop and industrial brownout scenarios.
What package type and thermal characteristics does the LT8390HUFD#TRPBF use?
The LT8390HUFD#TRPBF uses a 28-lead 4mm × 5mm plastic QFN package with exposed thermal pad (Pin 29 = GND). Its thermal resistance is θJA = 43°C/W and θJC = 3.4°C/W, enabling efficient heat transfer to the PCB ground plane-essential for maintaining 150°C junction rating in high-power 48W applications.
LT8390HUFD#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:
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT8390HUFD#TRPBF FAQ
1.How can I place an order for LT8390HUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390HUFD#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 LT8390HUFD#TRPBF reliable?
The price and inventory of LT8390HUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390HUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390HUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390HUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390HUFD#TRPBF?
LT8390HUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390HUFD#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 LT8390HUFD#TRPBF?
For technical support, including LT8390HUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390HUFD#TRPBF requirements.
6.How does Aetrix verify that LT8390HUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390HUFD#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 LT8390HUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390HUFD#TRPBF?
All LT8390HUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390HUFD#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 LT8390HUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT8390HUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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