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Analog Devices Inc. LT8390AIUFD#PBF
- Part No.:
- LT8390AIUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390AIUFD#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 28
- Quantity:
- Payment:
- Shipping:
Inventory:293
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Product details
Overview
LT8390AIUFD#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 spread spectrum EMI reduction. It delivers ±1.5% VOUT accuracy (1V–60V), ±3% current sensing accuracy, and 95% peak efficiency in 2MHz operation-enabling compact, high-frequency voltage regulation and battery/supercapacitor charging in automotive and industrial systems.
For engineers reviewing the LT8390AIUFD#PBF datasheet, LT8390AIUFD#PBF pinout, LT8390AIUFD#PBF application, or LT8390AIUFD#PBF equivalent, key selection considerations include its 28-pin QFN (4mm × 5mm) package, AEC-Q100 qualification, seamless buck/buck-boost/boost region transitions, and dual current-sense monitoring (ISP/ISN and LSP/LSN) for precise CV/CC control.
Technical Context
The LT8390AIUFD#PBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using two independent current sense paths: ISP/ISN for input/output current regulation and LSP/LSN for inductor current sensing. Its region transition logic automatically shifts between buck (VIN/VOUT ≤ 0.77), buck-boost (0.77–1.35), and boost (VIN/VOUT ≥ 1.33) modes with hysteresis to prevent chattering.
It integrates dual bootstrap drivers (BST1/BST2), high-side PMOS load switch control (LOADEN/LOADTG), and a 5V INTVCC LDO. Frequency is set via RT resistor (600kHz–2MHz) or synchronized externally; spread spectrum modulation (25% triangle) is enabled by tying SYNC/SPRD to INTVCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range inputs including 12V/24V/48V automotive and industrial rails. |
| Output Voltage Range | 0V to 60V - enables true buck-boost regulation across VIN = VOUT, VIN < VOUT, and VIN > VOUT. |
| Switching Frequency | 600kHz to 2MHz - adjustable via RT pin; 2MHz operation allows ultra-small magnetics and low-profile designs. |
| VOUT Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation for precision power rails and battery charge termination. |
| Current Sense Accuracy | ±3% for ISP/ISN - enables reliable input or output current limiting and monitoring in CV/CC applications. |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive and harsh industrial environments. |
| Package | 28-Lead QFN (4mm × 5mm) with exposed pad - optimized for thermal performance and PCB area efficiency. |
Pinout & Package
The LT8390AIUFD#PBF is housed in a 28-lead plastic QFN package (4mm × 5mm) with exposed GND pad, offering θJA = 43°C/W and 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 |
|---|---|---|
| FB | Voltage feedback input | Regulates output to 1.00V reference; enables CV control and overvoltage/short-circuit protection. |
| ISP / ISN | Input/output current sense differential pair | Supports programmable current limit and monitor output (ISMON = 10×V(ISP−ISN) + 0.25V). |
| LSP / LSN | Inductor current sense differential pair | Provides primary current signal for peak-buck/peak-boost control and reverse-current detection. |
| TG1 / BG1 / BST1 / SW1 | Buck-side gate drive circuit | Controls external N-MOSFETs in buck path; BST1 supplies floating gate drive for TG1. |
| TG2 / BG2 / BST2 / SW2 | Boost-side gate drive circuit | Controls external N-MOSFETs in boost path; BST2 supplies floating gate drive for TG2. |
| LOADEN / LOADTG | High-side PMOS load switch interface | Enables/disables external PMOS; LOADTG provides buffered inverted drive referenced to VOUT. |
| SYNC/SPRD | Frequency control input | GND = fixed frequency; INTVCC = 25% triangle spread spectrum; external clock = synchronization. |
| RT | Oscillator timing resistor | Resistor to GND sets switching frequency from 600kHz to 2MHz with ±5% tolerance. |
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 bidirectional power systems. |
| Seamless region transitions | Automatic, low-noise mode switching across buck/buck-boost/boost without output disturbance or control loop reset. |
| Spread spectrum EMI reduction | 25% triangle modulation on internal oscillator lowers peak radiated emissions without compromising regulation stability. |
| Dual current sensing paths | Independent ISP/ISN (for CV/CC regulation) and LSP/LSN (for inductor current control) enable robust fault detection and multi-loop designs. |
| AEC-Q100 Grade I qualification | Validated for automotive applications including infotainment, ADAS power supplies, and 12V/48V hybrid systems. |
Applications
| Automotive 12V/48V Power Conversion | Industrial Supercapacitor Charger |
|---|---|
Use Scenario: Regulating 48V battery output to stable 12V rail for vehicle infotainment and ADAS modules during cold-crank or load-dump events. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller maintaining regulated 12V output despite VIN swinging from 4V to 56V transiently. Use Value: Eliminates need for cascaded converters; achieves 95% efficiency at 2MHz, reducing thermal stress and enabling smaller passive components. | Use Scenario: Charging a 27V supercapacitor bank from a variable 10V–36V industrial DC bus while enforcing constant current then constant voltage profiles. IC Role / Device Role / Timing Role: Dual-loop controller using ISP/ISN for CC regulation and FB for CV termination, with seamless transition as capacitor voltage rises. Use Value: ±3% current accuracy and ±1.5% voltage accuracy ensure precise charge control; spread spectrum reduces EMI in noise-sensitive factory automation environments. |
| Telecom Remote Radio Unit (RRU) Power | Battery-Powered Test Equipment Supply |
Use Scenario: Providing 24V/3A regulated output from a 36V–60V telecom rectifier supply, with dynamic load step response and low standby current. IC Role / Device Role / Timing Role: High-frequency (2MHz) buck-boost controller delivering fast transient response and <2µA shutdown quiescent current. Use Value: 2MHz operation allows use of 1µH inductors; 4V–60V input range accommodates brownout and overvoltage conditions per GR-1089. | Use Scenario: Portable handheld tester requiring isolated, low-noise 5V/2A output from a single 7.4V Li-ion pack, with programmable current limit and soft-start. IC Role / Device Role / Timing Role: Compact buck-boost controller with SS pin-based soft-start and CTRL-programmable current threshold (5mV–100mV full scale). Use Value: 28-pin QFN package fits tight enclosures; 95% efficiency extends battery runtime; ±1.5% VOUT accuracy maintains measurement integrity. |
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 |
|---|---|---|---|
| LTC3780EFE#PBF | Fixed 550kHz–850kHz frequency; no spread spectrum; requires external VREF; no ISP/ISN current monitor. | Lacks integrated current monitor and EMI reduction features; suited for cost-sensitive non-automotive applications. | Select when spread spectrum and dual current sensing are not required and lower BOM cost is prioritized. |
| MPQ4332GQ-AEC1-Z | Integrated MOSFETs (40V max); fixed 600kHz–2.2MHz; no ISP/ISN path; AEC-Q100 qualified but no LSP/LSN sense. | Lower voltage rating and no independent input/output current sensing-limits use in high-VIN battery charger or wide-input telecom apps. | Choose only for lower-voltage (≤40V) automotive applications where integration outweighs flexibility and sensing precision. |
Compared with LTC3780EFE#PBF and MPQ4332GQ-AEC1-Z, the LT8390AIUFD#PBF uniquely combines 60V capability, dual current sensing (ISP/ISN + LSP/LSN), spread spectrum, and seamless region transitions-making it the only option qualified for high-accuracy, high-reliability 48V automotive and industrial buck-boost power conversion.
Availability
LT8390AIUFD#PBF is available at Aetrix Electronics and suitable for automotive power conversion, industrial supercapacitor charging, and telecom RRU power systems requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT8390AIUFD#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 industrial, automotive, communications, and healthcare markets.
The LT8390A product line was designed specifically for high-efficiency, wide-input-range buck-boost power conversion in safety-critical and thermally constrained applications-including automotive 12V/48V systems and industrial energy storage interfaces.
FAQ
What is the maximum input voltage supported by the LT8390AIUFD#PBF?
The LT8390AIUFD#PBF supports an absolute maximum input voltage of 60V on the VIN pin, with continuous operation specified from 4V to 60V. This enables direct compatibility with 48V automotive systems, industrial 24V/36V rails, and telecom rectified inputs-all without external clamping or pre-regulation stages. The LT8390AIUFD#PBF's robust input stage tolerates transients up to 63V (per datasheet TA01a), making it suitable for demanding environments where voltage surges occur.
Does the LT8390AIUFD#PBF support both constant-voltage and constant-current regulation?
Yes, the LT8390AIUFD#PBF supports dual-loop regulation: constant-voltage (CV) via the FB pin (regulated to 1.00V) and constant-current (CC) via the ISP/ISN differential input, with ±3% accuracy over temperature. The CTRL pin allows programming of the current sense threshold from 5mV to 100mV, enabling flexible CC limits for battery charging or LED driver applications. The LT8390AIUFD#PBF also provides ISMON-a buffered 10×V(ISP−ISN) + 0.25V output-for external monitoring or master-slave current sharing.
How does the LT8390AIUFD#PBF handle transitions between buck, buck-boost, and boost modes?
The LT8390AIUFD#PBF uses proprietary peak-buck/peak-boost current mode control with hysteresis-based region detection. Transitions occur automatically at defined VIN/VOUT ratios: buck-to-buck-boost at ~0.75, buck-boost-to-boost at ~1.33, and vice versa-with built-in hysteresis (e.g., 0.02 for buck-boost ↔ boost) to prevent oscillation. No external control or mode pins are needed; the LT8390AIUFD#PBF maintains regulation continuity and low output ripple throughout all transitions, verified in typical performance graphs (Figures G01–G03).
What package type and thermal characteristics does the LT8390AIUFD#PBF use?
The LT8390AIUFD#PBF uses a 28-lead plastic QFN package measuring 4mm × 5mm with an exposed GND pad. Its thermal resistance is θJA = 43°C/W and θJC = 3.4°C/W when mounted on a standard 4-layer PCB with 2-in² copper pour under the exposed pad. This enables operation up to 125°C junction temperature with proper layout-critical for under-hood automotive and enclosed industrial applications where airflow is limited.
Is the LT8390AIUFD#PBF AEC-Q100 qualified, and what grade does it meet?
Yes, the LT8390AIUFD#PBF is AEC-Q100 qualified and rated Grade I (–40°C to +125°C ambient), meeting stringent automotive reliability requirements for powertrain-adjacent and body electronics applications. Per the datasheet ORDER INFORMATION table, the "I" suffix denotes the industrial/automotive temperature grade, and the #PBF suffix confirms lead-free, RoHS-compliant packaging. Full qualification reports are available through Analog Devices' automotive support channel.
LT8390AIUFD#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT8390AIUFD#PBF FAQ
1.How can I place an order for LT8390AIUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390AIUFD#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 LT8390AIUFD#PBF reliable?
The price and inventory of LT8390AIUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390AIUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT8390AIUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390AIUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390AIUFD#PBF?
LT8390AIUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390AIUFD#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 LT8390AIUFD#PBF?
For technical support, including LT8390AIUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390AIUFD#PBF requirements.
6.How does Aetrix verify that LT8390AIUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8390AIUFD#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 LT8390AIUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT8390AIUFD#PBF?
All LT8390AIUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390AIUFD#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 LT8390AIUFD#PBF part is unused and in its original packaging.
Return procedure for LT8390AIUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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