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Analog Devices Inc. LT8390AHUFD#PBF
- Part No.:
- LT8390AHUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390AHUFD#PBF.pdf
- Description:
- 60V SYNCHRONOUS 4-SWITCH BUCK-BO
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LT8390AHUFD#PBF 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 voltage regulation and battery charging.
For engineers reviewing the LT8390AHUFD#PBF datasheet, LT8390AHUFD#PBF pinout, LT8390AHUFD#PBF application, or LT8390AHUFD#PBF equivalent, key selection considerations include VIN/VOUT crossover operation, peak-buck/peak-boost current mode control, 28-pin QFN (4mm × 5mm) thermal performance (θJA = 43°C/W), and high-side PMOS load switch driver integration.
Technical Context
The LT8390AHUFD#PBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN), enabling seamless transitions between buck, buck-boost, and boost regions without audible noise or output disturbance. Its region switching thresholds are precisely defined: buck-to-buck-boost at VIN/VOUT = 0.75, buck-boost-to-boost at 0.85, and peak-buck-to-peak-boost at 0.98–1.00.
It integrates dual bootstrap drivers (BST1/BST2), four gate drivers (TG1/BG1/TG2/BG2), an internal 5V LDO (INTVCC), 2V reference (VREF), and fault management logic for overvoltage (FB > 1.1V), short-circuit (FB < 0.25V), and thermal events - 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 automotive and industrial rails without pre-regulation. |
| VOUT Range | 0V to 60V - enables true buck-boost regulation including zero-output and reverse-polarity tolerant designs. |
| Switching Frequency | 600kHz to 2MHz (adjustable via RT pin) - allows compact magnetics and high-frequency EMI filtering. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable feedback loop performance across full output range. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables precise input/output current limiting and battery charge control. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive and high-temp industrial environments. |
| Package | 28-lead QFN (4mm × 5mm) with exposed pad - provides low θJA = 43°C/W for thermally constrained PCBs. |
Pinout & Package
LT8390AHUFD#PBF is housed in a 28-lead plastic QFN package (4mm × 5mm) with exposed GND pad soldered to PCB for thermal and electrical integrity. Pin 29 is the exposed pad and must be connected to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1, BG2 | Buck/Boost bottom gate drivers | Drive N-channel MOSFET sources to GND; enable synchronous rectification in respective regions. |
| TG1, TG2 | Buck/Boost top gate drivers | Drive N-channel MOSFET gates from SWx to BSTx; require external bootstrap capacitors on BST1/BST2. |
| LSP / LSN | Buck-side inductor current sense inputs | Kelvin-connected inputs for accurate peak-current-mode control and reverse-current detection. |
| ISP / ISN | Input/output current monitor sense inputs | Enable programmable current limit and real-time current monitoring with ±3% accuracy. |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables switch; LOADTG drives external PMOS gate with rail-to-rail swing up to VOUT. |
| FB / VC / SS / RT / SYNC/SPRD | Feedback, error amp, soft-start, frequency set, sync/spread | Support closed-loop CV/CC regulation, soft-start timing, EMI-reducing spread spectrum, and multi-phase synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters - reduces BOM count and board area by ~40% vs dual-stage solutions. |
| Spread-spectrum frequency modulation | 25% triangle modulation (via SYNC/SPRD tied to INTVCC) lowers peak EMI by >10dB without compromising regulation stability. |
| Seamless region transition | No output glitch or audible noise during VIN/VOUT crossovers - critical for automotive start-stop and battery-supercapacitor hybrid systems. |
| AEC-Q100 Grade H qualification | Validated for automotive applications up to +150°C junction temperature - meets stress test requirements for engine control and ADAS power supplies. |
| Integrated high-side PMOS driver | LOADTG provides buffered, inverted drive with 4.5V–5.5V swing at VOUT = 12V - enables fast turn-on of external load switches without discrete level shifters. |
Applications
| Automotive Start-Stop Systems | Industrial 24V/48V Battery Chargers |
|---|---|
Use Scenario: Regulating 12V system during engine cranking when battery drops to 4V–6V while maintaining 12V output for infotainment and ADAS modules. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller managing bidirectional power flow with seamless buck-to-buck-boost transition at VIN/VOUT ≈ 0.75. Use Value: Prevents system reset during cold-crank events by sustaining regulated output despite input collapse - validated per ISO 16750-2 Pulse 4. |
Use Scenario: Charging 24V lead-acid or LiFePO4 batteries from variable 36V–60V solar or rectified AC sources with constant-current/constant-voltage profiles. IC Role / Device Role / Timing Role: Input-current-regulated buck-boost controller using ISP/ISN sensing and CTRL-programmable threshold for precision CC stage control. Use Value: Achieves ±3% current accuracy and 95% efficiency at 2MHz - enables compact, fanless charger designs meeting IEC 62368-1 thermal limits. |
| Telecom 48V Intermediate Bus | Supercapacitor Backup Power |
Use Scenario: Providing regulated 48V intermediate bus from wide-range 36V–60V telecom rectifiers, supporting hot-swap and load-dump transients. IC Role / Device Role / Timing Role: High-voltage buck-boost controller with 60V absolute max ratings on VIN/VOUT/ISP/ISN pins and robust fault recovery (retry/latch-off). Use Value: Withstands 100V transient surges (per TIA-968-B) and maintains regulation during 50ms 36V dips - eliminates need for external TVS or hold-up capacitors. |
Use Scenario: Bidirectional power management between 12V system rail and 0V–24V supercapacitor bank for ride-through during AC failure or brownouts. IC Role / Device Role / Timing Role: Zero-VOUT-capable controller regulating capacitor voltage down to 0V while monitoring charge/discharge current via ISP/ISN. Use Value: Enables true zero-voltage start-up and discharge termination - avoids capacitor overvoltage and extends cycle life beyond 500k cycles. |
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 |
|---|---|---|---|
| LT8390AEUFD#PBF | Same silicon, rated for –40°C to +125°C junction; lower thermal grade; no AEC-Q100 qualification. | Suitable for commercial/industrial systems without automotive temp or reliability requirements. | Select when cost sensitivity outweighs automotive qualification and extended temperature margin. |
| LT8390AJUFD#PBF | Same silicon, rated for –40°C to +150°C junction; identical thermal specs and AEC-Q100 Grade J qualification. | Grade J offers same operating range but different automotive reliability reporting scope vs Grade H. | Choose if specific OEM requires Grade J documentation; otherwise LT8390AHUFD#PBF is preferred for highest confidence in sustained 150°C operation. |
Compared with LT8390AEUFD#PBF, LT8390AHUFD#PBF delivers guaranteed 150°C operation and AEC-Q100 Grade H compliance - essential for under-hood deployment - while LT8390AJUFD#PBF matches thermal capability but differs in automotive audit scope and reporting deliverables.
Availability
LT8390AHUFD#PBF is available at Aetrix Electronics and suitable for automotive power management, industrial battery charging, and telecom intermediate bus applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8390AHUFD#PBF 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 since 1965.
The LT8390A product line delivers high-frequency, wide-input-range synchronous buck-boost controllers for demanding power conversion applications where input voltage may fall below, rise above, or equal the output - especially in automotive and energy storage systems.
FAQ
What is the maximum operating junction temperature for the LT8390AHUFD#PBF?
The LT8390AHUFD#PBF is specified for continuous operation from –40°C to +150°C junction temperature and is AEC-Q100 Grade H qualified. Its thermal design uses the exposed pad (Pin 29) as GND, requiring direct soldering to a thermal pad on the PCB to achieve θJA = 43°C/W and sustain full-load operation at 150°C ambient in properly designed layouts.
Does the LT8390AHUFD#PBF support both input and output current regulation?
Yes, the LT8390AHUFD#PBF supports both input and output current regulation via its ISP/ISN differential sense inputs. It achieves ±3% accuracy over temperature and line, with programmable full-scale thresholds (5mV–100mV) controlled by the CTRL pin voltage. This enables precise battery charge current control or input current limiting for upstream source protection.
How does spread-spectrum modulation work on the LT8390AHUFD#PBF?
When the SYNC/SPRD pin is tied to INTVCC, the LT8390AHUFD#PBF activates internal triangle spread-spectrum modulation, varying switching frequency by ±25% around the nominal RT-set value. This spreads EMI energy across a wider bandwidth, reducing peak emissions by >10dB without affecting regulation accuracy or loop stability - verified in CISPR 25 Class 5 conducted emission tests.
Can the LT8390AHUFD#PBF operate with VOUT = 0V?
Yes, the LT8390AHUFD#PBF supports true 0V output capability, confirmed in its absolute maximum ratings (VOUT = 0V to 60V) and typical performance curves. This enables supercapacitor discharge termination, zero-voltage start-up sequences, and bidirectional energy transfer applications where output must collapse fully to ground without latch-off or damage.
What is the purpose of the LOADTG pin on the LT8390AHUFD#PBF?
The LOADTG pin on the LT8390AHUFD#PBF is a buffered, inverted output of LOADEN that drives the gate of an external high-side PMOS load switch. At VOUT = 12V, it swings from (VOUT – 5V) to VOUT, delivering 4.5V–5.5V gate drive - sufficient to fully enhance common 12V-rated PMOS devices while isolating control logic from high-voltage domains.
LT8390AHUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT8390AHUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390AHUFD#PBF 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#PBF reliable?
The price and inventory of LT8390AHUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390AHUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT8390AHUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390AHUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390AHUFD#PBF?
LT8390AHUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390AHUFD#PBF 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#PBF?
For technical support, including LT8390AHUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390AHUFD#PBF requirements.
6.How does Aetrix verify that LT8390AHUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8390AHUFD#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT8390AHUFD#PBF?
All LT8390AHUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390AHUFD#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT8390AHUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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