My Inquiry
My Account
Analog Devices Inc. LT8390AEUFD#PBF
- Part No.:
- LT8390AEUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8390AEUFD#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 28
- Quantity:
- Payment:
- Shipping:
Inventory:316
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8390AEUFD#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% output voltage accuracy, ±3% current sensing accuracy, and 95% peak efficiency in 2MHz operation-enabling compact, high-frequency battery charger and automotive voltage regulator designs.
For engineers reviewing the LT8390AEUFD#PBF datasheet, LT8390AEUFD#PBF pinout, LT8390AEUFD#PBF application, or LT8390AEUFD#PBF equivalent, key selection criteria include its seamless buck/buck-boost/boost region transitions, programmable 600kHz–2MHz switching frequency, AEC-Q100 qualification for automotive use, and integrated high-side PMOS load switch driver for system-level power sequencing.
Technical Context
The LT8390AEUFD#PBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN), enabling smooth, low-noise transitions across VIN/VOUT ratios from 0.73 to 1.35. Its dual-region control logic dynamically selects between peak-buck (buck & buck-boost) and peak-boost (buck-boost & boost) modes based on real-time VIN/VOUT ratio, eliminating discontinuities in regulation.
It integrates two independent gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), dual bootstrap supplies (BST1/BST2), and a dedicated 5V INTVCC LDO. The controller supports both internal oscillator (RT-set) and external synchronization (SYNC/SPRD pin), with triangle spread spectrum modulation (21–25% above base frequency) activated by tying SYNC/SPRD to INTVCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide automotive battery transients (e.g., cold-crank to load-dump) without external pre-regulation. |
| Output Voltage Range | 0V to 60V - enables bidirectional voltage regulation, battery charging, and supercapacitor balancing applications. |
| Switching Frequency | 600kHz to 2MHz (adjustable via RT pin) - allows optimization of size vs. efficiency; 2MHz operation enables <1µH inductors and ultra-compact layouts. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable regulation across full output range for precision power rails. |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables reliable input/output current limiting and battery charge/discharge control. |
| Spread Spectrum Modulation | 21–25% triangle FM - reduces peak EMI by spreading energy across frequency band, easing CISPR 25 Class 5 compliance. |
| Operating Junction Temp | –40°C to +125°C - qualified for under-hood automotive and industrial environments with no derating required. |
Pinout & Package
LT8390AEUFD#PBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND). The package provides θJA = 43°C/W and θJC = 3.4°C/W, enabling high-power density operation with minimal PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage feedback input | Regulates output to 1.00V reference; enables precise CV control and overvoltage/short-circuit protection. |
| ISP / ISN | Current sense differential inputs | Kelvin-connected to RSENSE; provide ±3% accurate input/output current monitoring and limiting. |
| TG1 / BG1 / BST1 / SW1 | Buck-side gate drive network | Controls external N-MOSFETs in buck path; BST1 integrates Schottky diode for bootstrap capacitor charging. |
| TG2 / BG2 / BST2 / SW2 | Boost-side gate drive network | Controls external N-MOSFETs in boost path; independent timing prevents shoot-through during region transitions. |
| LOADEN / LOADTG | High-side PMOS load switch interface | Enables controlled power-up/down sequencing; LOADTG drives external PMOS with rail-to-rail swing referenced to VOUT. |
| SYNC/SPRD | Frequency control input | Ground = fixed oscillator; INTVCC = 25% spread spectrum; external clock = synchronization to system master clock. |
| RT | Oscillator frequency set | Resistor to GND sets switching frequency from 600kHz to 2MHz; enables layout-optimized noise/efficiency tradeoff. |
| PGOOD | Open-drain power-good flag | Asserts when FB is within ±10% of target; used for system enable sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters; reduces BOM count, board space, and design complexity in wide-input-range systems. |
| Seamless region transition | No output disturbance or control loop instability when crossing buck → buck-boost → boost boundaries; critical for automotive start-stop and battery backup systems. |
| Integrated 5V INTVCC LDO | Supplies internal logic and gate drivers from VIN; eliminates need for external bias supply, simplifying auxiliary power design. |
| AEC-Q100 Grade E | Qualified for automotive applications per Rev H; supports functional safety requirements in ADAS and body electronics. |
| Programmable fault response | Hiccup, latch-off, or continuous operation during short-circuit - configured via SS pin resistor, enabling application-specific reliability tuning. |
Applications
| Automotive Start-Stop Systems | Industrial 24V/48V Battery Chargers |
|---|---|
Use Scenario: Maintains stable 12V rail during engine cranking (VIN drops to 4–6V) and alternator overvoltage (VIN spikes to 60V). IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller regulating VOUT = 12V regardless of VIN variation; handles bidirectional power flow during regenerative braking. Use Value: Eliminates need for separate buck and boost stages; achieves >90% efficiency across full transient range without output dropout. | Use Scenario: Charges 24V lead-acid or 48V LiFePO₄ battery from variable solar or generator input (8–60V). IC Role / Device Role / Timing Role: Constant-current/constant-voltage (CC/CV) battery charger controller with ISP/ISN current monitoring and PGOOD sequencing. Use Value: ±3% current accuracy enables precise charge termination; spread spectrum reduces conducted EMI in sensitive industrial environments. |
| Telecom 48V Intermediate Bus | High-Frequency Portable Medical Equipment |
Use Scenario: Generates isolated 3.3V/5V/12V rails from unregulated 48V telecom bus subject to hot-swap and load-dump transients. IC Role / Device Role / Timing Role: Wide-input buck-boost controller operating at 2MHz to minimize filter size; uses RT pin for frequency tuning to avoid noise-sensitive bands. Use Value: 2MHz switching enables sub-3mm height designs; ±1.5% VOUT accuracy ensures stable digital logic supply under dynamic load. | Use Scenario: Powers portable ultrasound or infusion pump from single-cell Li-ion (2.7–4.2V) while delivering regulated 5V/12V outputs. IC Role / Device Role / Timing Role: High-efficiency buck-boost controller with shutdown quiescent current <2µA (EN/UVLO <0.3V); supports battery runtime extension. Use Value: 95% peak efficiency at 2MHz extends battery life; VOUT disconnection during shutdown prevents reverse current drain. |
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 |
|---|---|---|---|
| LT8708IUFD#PBF | Wider 2.8V–80V input; no spread spectrum; lower 100kHz–800kHz freq range; lacks LOADEN/LOADTG driver. | Preferred for ultra-wide-input industrial supplies where EMI is less constrained and load switch control is unnecessary. | Select LT8708IUFD#PBF only if input exceeds 60V or spread spectrum is not required; verify gate drive compatibility with external MOSFETs. |
| MPQ4333GL-AEC1-Z | Monolithic 3.5A solution (integrated MOSFETs); 4V–36V input; fixed 2.2MHz; no ISP/ISN current monitor; AEC-Q100 qualified. | Suitable for lower-power (<20W), space-constrained automotive modules where integration outweighs flexibility. | Choose MPQ4333GL-AEC1-Z for cost-sensitive, low-complexity designs below 36V input; avoid when >36V input or precision current monitoring is needed. |
Compared with LT8390AEUFD#PBF, LT8708IUFD#PBF offers higher VIN tolerance but sacrifices EMI performance and system-level power sequencing; MPQ4333GL-AEC1-Z trades external MOSFET flexibility and current monitoring for smaller footprint and lower BOM count in sub-36V applications.
Availability
LT8390AEUFD#PBF is available at Aetrix Electronics and suitable for automotive voltage regulators, industrial battery chargers, and telecom intermediate bus converters requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8390AEUFD#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 delivers high-frequency, wide-input-range synchronous buck-boost controllers optimized for automotive start-stop, battery-powered systems, and industrial power supplies demanding seamless regulation across VIN/VOUT crossover points.
FAQ
What is the maximum switching frequency supported by the LT8390AEUFD#PBF?
The LT8390AEUFD#PBF supports an adjustable switching frequency from 600kHz to 2MHz, set via an external resistor on the RT pin. At RT = 59.0kΩ, it operates at approximately 2MHz (typical 1.9–2.1MHz), enabling compact magnetics and high-density power designs without sacrificing efficiency.
Does the LT8390AEUFD#PBF integrate MOSFET drivers for both buck and boost paths?
Yes, the LT8390AEUFD#PBF integrates four independent N-channel MOSFET gate drivers: TG1/BG1 for the buck-side switches and TG2/BG2 for the boost-side switches. Each pair includes dedicated bootstrap supplies (BST1/BST2) and supports fast rise/fall times (20–25ns) with robust 1.2–3.2Ω pull-up/pull-down resistance.
How does the LT8390AEUFD#PBF handle transitions between buck, buck-boost, and boost operating regions?
The LT8390AEUFD#PBF uses proprietary peak-buck/peak-boost current mode control with hysteresis-based region detection. It smoothly transitions across VIN/VOUT ratios (e.g., buck-boost to boost at VIN/VOUT = 0.83–0.87) without output disturbance, using a single inductor current sense resistor (LSP/LSN) and adaptive gate timing to prevent shoot-through.
Is the LT8390AEUFD#PBF qualified for automotive applications?
Yes, the LT8390AEUFD#PBF is AEC-Q100 qualified (Grade E, –40°C to +125°C junction temperature) and manufactured under controlled automotive processes. It meets stringent reliability, ESD, and transient immunity requirements for under-hood and body electronics applications.
What is the function of the LOADEN and LOADTG pins on the LT8390AEUFD#PBF?
The LOADEN pin controls an integrated high-side PMOS load switch driver. When LOADEN is asserted, LOADTG drives an external PMOS with rail-to-rail swing (VOUT–5V to VOUT), enabling controlled power-up/down sequencing and isolation of downstream circuitry during fault conditions or shutdown.
LT8390AEUFD#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)
LT8390AEUFD#PBF FAQ
1.How can I place an order for LT8390AEUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390AEUFD#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 LT8390AEUFD#PBF reliable?
The price and inventory of LT8390AEUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390AEUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT8390AEUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390AEUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390AEUFD#PBF?
LT8390AEUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390AEUFD#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 LT8390AEUFD#PBF?
For technical support, including LT8390AEUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390AEUFD#PBF requirements.
6.How does Aetrix verify that LT8390AEUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8390AEUFD#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 LT8390AEUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT8390AEUFD#PBF?
All LT8390AEUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390AEUFD#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 LT8390AEUFD#PBF part is unused and in its original packaging.
Return procedure for LT8390AEUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8390AEUFD#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
