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Analog Devices Inc. LT8390EUFD#WPBF
- Part No.:
- LT8390EUFD#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390EUFD#WPBF.pdf
- Description:
- 60V SYNC 4-SWITCH BUCK-BOOST CNT
- Quantity:
- Payment:
- Shipping:
Inventory:404
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Product details
Overview
LT8390EUFD#WPBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V–60V input and 0V–60V output, with ±1.5% output voltage accuracy, 150kHz–650kHz adjustable switching frequency, and spread-spectrum EMI reduction. It regulates voltage or input/output current in automotive battery systems, industrial power supplies, and telecom voltage regulators requiring seamless VIN-above/VIN-below-VOUT operation.
For engineers reviewing the LT8390EUFD#WPBF datasheet, LT8390EUFD#WPBF pinout, LT8390EUFD#WPBF application, or LT8390EUFD#WPBF equivalent, key selection criteria include its peak-buck/peak-boost current mode control, integrated bootstrap diodes, high-side PMOS load switch driver, AEC-Q100 qualification, and QFN-28 (4mm × 5mm) package with exposed thermal pad.
Technical Context
The LT8390EUFD#WPBF implements a proprietary dual-mode current sensing architecture using a single inductor current sense resistor (LSP/LSN) to support continuous transition between buck, buck-boost, and boost regions without audible noise or regulation discontinuity. Its region detection 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 1.00.
Control logic integrates two independent error amplifiers (EA1 for voltage loop, EA2 for current loop), synchronized oscillator with RT-resistor programming, and dedicated LOADEN/LOADTG circuitry enabling external high-side PMOS load switching with 4.6V–5.6V gate drive swing referenced to VOUT. Fault handling includes FB overvoltage latch-off (1.10V threshold), short-circuit hiccup/latch/keep-running modes via SS pin resistor configuration, and ±3% ISP/ISN current monitor accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range battery inputs including 12V, 24V, and 48V automotive and industrial rails. |
| Output Voltage Range | 0V to 60V - enables bidirectional voltage regulation for supercapacitor charging and battery backup systems. |
| Switching Frequency | 150kHz to 650kHz - adjustable via RT resistor; ±15% triangle spread spectrum reduces EMI peaks without external filtering. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation across temperature and line/load variations in precision power supplies. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables reliable input/output current limiting and telemetry in battery management applications. |
| Package | 28-Lead QFN (4mm × 5mm) with exposed GND pad - provides low θJC = 3.4°C/W thermal resistance for high-power 48W operation. |
| AEC-Q100 Grade | Grade I (–40°C to +125°C junction) - qualified for automotive infotainment, ADAS power rails, and engine control modules. |
Pinout & Package
LT8390EUFD#WPBF uses a 28-lead plastic QFN (4mm × 5mm) package with exposed thermal pad (Pin 29 = GND). The package features θJA = 43°C/W and θJC = 3.4°C/W, requiring soldered GND pad for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Buck/Boost switch nodes | Connect to inductor ends; swing from ground to VIN (SW1) or ground to VOUT (SW2); require Kelvin routing for low-noise current sensing. |
| LSP / LSN | Buck-side inductor current sense inputs | Kelvin-connected across RSENSE to enable accurate peak-buck current mode control and reverse-current detection. |
| ISP / ISN | Input/output current sense inputs | Kelvin-connected across RIS to program and monitor input or output current with ±3% accuracy. |
| TG1 / TG2 / BG1 / BG2 | N-channel MOSFET gate drivers | Drive external high-side (TG1/TG2) and low-side (BG1/BG2) switches; TG1/TG2 swing from SWx to BSTx; BG1/BG2 swing from GND to INTVCC. |
| BST1 / BST2 | Bootstrap supply pins | Integrate Schottky diodes from INTVCC; require external capacitors to SW1/SW2 for high-side N-MOSFET gate drive. |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables external PMOS; LOADTG provides inverted, buffered gate drive referenced to VOUT (4.6V–5.6V swing). |
| FB / VC / CTRL / SS / RT | Analog control and compensation | FB sets output voltage (1.00V reference); VC is error amp output; CTRL programs current limit; SS configures soft-start/fault mode; RT sets oscillator frequency. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor topology | Eliminates need for separate buck and boost converters; supports seamless transitions across VIN/VOUT ratios without mode-hopping artifacts. |
| Integrated bootstrap Schottky diodes | Reduces external component count by eliminating discrete bootstrap diodes while maintaining robust high-side gate drive. |
| Spread-spectrum frequency modulation | ±15% triangle modulation around programmed frequency lowers peak EMI by >10dB, easing CISPR-25 Class 5 compliance in automotive designs. |
| VOUT-disconnected shutdown | Isolates output from input during shutdown, preventing backfeed and enabling safe hot-swap capability in redundant power systems. |
| Programmable fault response | SS pin resistor selection (open, 499kΩ, 100kΩ) configures short-circuit protection as hiccup, latch-off, or keep-running-no firmware required. |
Applications
| Automotive Battery Management | Industrial 24V/48V Power Supply |
|---|---|
Use Scenario: Regulating 12V battery output to stable 5V/3.3V for infotainment MCU during cold-crank (VIN drops to 3.5V) and load-dump (VIN spikes to 60V). IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller maintaining constant VOUT despite VIN crossing VOUT boundary; handles 100% duty cycle in buck mode and 0% in boost mode. Use Value: Eliminates need for pre-regulator + post-regulator cascade; achieves 98% efficiency at 4A/12V output with <10mV output ripple under transient load steps. | Use Scenario: Providing isolated 24V output from variable 18–36V industrial input rail for PLC I/O modules requiring precise current-limited sourcing. IC Role / Device Role / Timing Role: Input-current-regulated buck-boost controller using ISP/ISN feedback to deliver constant 2A output current regardless of input voltage or load impedance changes. Use Value: Enables programmable current limit (via CTRL pin) and real-time current telemetry (via ISMON) for predictive maintenance and overload diagnostics. |
| Telecom 48V Backup System | High-Power Portable Equipment |
Use Scenario: Charging supercapacitor banks from 48V telecom rectifier while simultaneously powering 12V payload during AC failure. IC Role / Device Role / Timing Role: Bidirectional buck-boost controller operating in both charging (buck) and discharging (boost) modes with shared inductor and current sense path. Use Value: Single-chip solution reduces BOM cost by 35% vs dual-converter approach; ±1.5% VOUT accuracy ensures consistent capacitor voltage ramping and discharge cutoff. | Use Scenario: Powering 12V motor and 5V sensors from 2–3S Li-ion battery (6–12.6V) in portable test equipment with dynamic load profiles. IC Role / Device Role / Timing Role: Wide-input buck-boost controller maintaining regulated outputs across full battery discharge curve, including below-VOUT and above-VOUT regions. Use Value: Seamless region transition prevents output glitches during battery sag; spread-spectrum operation meets FCC Part 15 Class B emissions without shielding. |
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 |
|---|---|---|---|
| LTC3780EFE#PBF | Same 4-switch architecture but fixed 200kHz–600kHz range; no spread spectrum; lower max input (40V); no AEC-Q100 grade. | Targeted at non-automotive industrial supplies where EMI is less constrained and input voltage stays ≤40V. | Select LTC3780EFE#PBF only if spread spectrum and 60V input headroom are unnecessary and cost sensitivity outweighs thermal performance. |
| MPQ4332GQ-AEC1-Z | Monolithic 4-switch buck-boost IC (integrated MOSFETs); 3.3V–40V input; 0.8V–24V output; 3A max; no ISP/ISN current monitor or LOADTG driver. | Suitable for space-constrained, lower-power (<25W) automotive modules where integration trumps flexibility and telemetry. | Choose MPQ4332GQ-AEC1-Z when board area is critical, output current ≤3A, and external MOSFET control/monitoring is not required. |
Compared with LTC3780EFE#PBF and MPQ4332GQ-AEC1-Z, the LT8390EUFD#WPBF uniquely combines 60V input capability, AEC-Q100 qualification, ISP/ISN current monitoring, and programmable spread-spectrum EMI reduction-making it the only option for high-reliability, high-power, EMI-sensitive automotive and industrial buck-boost applications.
Availability
LT8390EUFD#WPBF is available at Aetrix Electronics and suitable for automotive battery management, industrial 24V/48V power supplies, and telecom backup systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for LT8390EUFD#WPBF 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 LT8390EUFD#WPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive and industrial applications requiring wide input ranges, seamless buck-boost operation, and robust fault protection.
FAQ
What is the maximum input voltage rating for the LT8390EUFD#WPBF?
The LT8390EUFD#WPBF has an absolute maximum input voltage rating of 60V on the VIN pin, with guaranteed operation across a 4V to 60V input range. This allows direct interface with 48V automotive systems, industrial 24V/36V rails, and telecom rectified inputs without external clamping or pre-regulation.
Does the LT8390EUFD#WPBF support both input and output current regulation?
Yes, the LT8390EUFD#WPBF supports precise input or output current regulation via its ISP/ISN differential current sense inputs. With ±3% accuracy over temperature, it enables programmable current limiting and real-time current telemetry for battery charging, LED drivers, and motor control applications.
How does the LT8390EUFD#WPBF achieve low EMI in automotive designs?
The LT8390EUFD#WPBF achieves low EMI through integrated triangle spread-spectrum frequency modulation (±15% around the programmed switching frequency), which spreads energy across a wider bandwidth and reduces peak radiated emissions. This feature helps meet stringent CISPR-25 Class 5 requirements without additional shielding or filtering components.
What package type and thermal characteristics does the LT8390EUFD#WPBF use?
The LT8390EUFD#WPBF uses a 28-lead QFN package (4mm × 5mm) with exposed thermal pad (Pin 29 = GND). It delivers θJC = 3.4°C/W and θJA = 43°C/W, enabling 48W operation (12V/4A) with minimal heatsinking-critical for compact automotive and industrial power modules.
Is the LT8390EUFD#WPBF qualified for automotive applications?
Yes, the LT8390EUFD#WPBF is AEC-Q100 qualified (Grade I, –40°C to +125°C junction temperature) and manufactured with controlled processes for automotive reliability. It is explicitly designated for use in automotive infotainment, ADAS, body electronics, and powertrain subsystems.
LT8390EUFD#WPBF 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:
- 190kHz ~ 630kHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT8390EUFD#WPBF FAQ
1.How can I place an order for LT8390EUFD#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390EUFD#WPBF 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 LT8390EUFD#WPBF reliable?
The price and inventory of LT8390EUFD#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390EUFD#WPBF is usually 5 days.
3.What payment methods are accepted for LT8390EUFD#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390EUFD#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390EUFD#WPBF?
LT8390EUFD#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390EUFD#WPBF 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 LT8390EUFD#WPBF?
For technical support, including LT8390EUFD#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390EUFD#WPBF requirements.
6.How does Aetrix verify that LT8390EUFD#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8390EUFD#WPBF 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 LT8390EUFD#WPBF meets industry standards.
7.What is the process for return or replacement of LT8390EUFD#WPBF?
All LT8390EUFD#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390EUFD#WPBF, 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 LT8390EUFD#WPBF part is unused and in its original packaging.
Return procedure for LT8390EUFD#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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