My Inquiry
My Account
Analog Devices Inc. LT8390AIFE#PBF
- Part No.:
- LT8390AIFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390AIFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 28
- Quantity:
- Payment:
- Shipping:
Inventory:200
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8390AIFE#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 and ±3% current sensing accuracy, enabling seamless transitions between buck, buck-boost, and boost modes. It is used in automotive battery management systems requiring wide VIN/VOUT ratio handling and low-noise regulation.
For engineers reviewing the LT8390AIFE#PBF datasheet, LT8390AIFE#PBF pinout, LT8390AIFE#PBF application, or LT8390AIFE#PBF equivalent, key selection criteria include its peak-buck/peak-boost current mode control, AEC-Q100 qualification, 28-lead TSSOP package with exposed pad, and support for input/output current monitoring with PGOOD flag.
Technical Context
The LT8390AIFE#PBF implements Analog Devices' proprietary peak-buck/peak-boost current mode architecture, using a single inductor current sense resistor (LSP/LSN) to maintain regulation across all three operating regions. Its dual-mode comparator structure enables smooth, low-noise transitions at VIN/VOUT ratios of 0.75 (buck→buck-boost), 0.85 (boost→buck-boost), 1.25 (buck→buck-boost), and 1.33 (buck-boost→boost), with hysteresis preventing mode chatter.
It integrates two independent gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), an internal 5V INTVCC LDO, 2V VREF reference, and programmable fault response (hiccup/latch-off/keep-running) via SS pin resistor configuration. The CTRL pin linearly scales ISP/ISN current threshold from 5mV to 100mV over 0.3V–1.35V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports 12V/24V/48V automotive and industrial rails without pre-regulation |
| Output Voltage Range | 0V to 60V - enables bidirectional voltage regulation and battery charging/discharging |
| Switching Frequency | 600kHz to 2MHz - adjustable via RT resistor; 25% triangle spread spectrum reduces EMI peaks |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable CV regulation in battery charger and supply applications |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables precise input/output current limiting and telemetry |
| Operating Junction Temp | –40°C to 125°C - qualified per AEC-Q100 Grade I for under-hood automotive use |
| Package | 28-Lead TSSOP with exposed pad - θJC = 5°C/W enables high-power thermal management |
Pinout & Package
LT8390AIFE#PBF is housed in a 28-lead plastic TSSOP package with exposed pad (pin 29), which must be soldered to PCB ground for thermal and electrical integrity. θJA = 30°C/W, θJC = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage feedback input | Regulates VOUT to 1.00V reference; triggers FB overvoltage (1.1V) or short-circuit (0.25V) protection |
| ISP / ISN | High-side current sense inputs | Kelvin-connected to RIS for ±3% accurate input/output current measurement and limiting |
| TG1 / BG1 / SW1 / BST1 | Buck-side power switch interface | Drives external N-MOSFETs in buck topology; BST1 supplies floating gate drive for TG1 |
| TG2 / BG2 / SW2 / BST2 | Boost-side power switch interface | Drives external N-MOSFETs in boost topology; BST2 supplies floating gate drive for TG2 |
| LOADEN / LOADTG | High-side PMOS load switch control | Enables/disables external PMOS; LOADTG provides inverted, buffered gate drive referenced to VOUT |
| SYNC/SPRD | Frequency control input | GND = fixed oscillator; INTVCC = 25% spread spectrum; external clock = synchronization |
| RT | Oscillator frequency set | Resistor to GND sets switching frequency from 600kHz to 2MHz (e.g., 100kΩ ≈ 1.3MHz) |
| PGOOD | Open-drain status flag | Pulled low when FB is within ±10% of target - indicates valid regulation and safe system startup |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck + boost ICs; reduces BOM count and board area in space-constrained systems |
| Seamless region transition | No output glitch or regulation dropout during VIN/VOUT crossover - critical for automotive cold-crank and start-stop operation |
| Spread spectrum modulation | 25% triangle dither reduces peak EMI by >10dB, easing CISPR 25 Class 5 compliance without added filtering |
| Programmable fault response | SS pin resistor selects hiccup (no resistor), latch-off (499kΩ), or keep-running (100kΩ) on output short |
| AEC-Q100 Grade I qualification | Validated for automotive under-hood environments including temperature cycling, HTOL, and ESD testing |
Applications
| Automotive Battery Management | Industrial Wide-Input Power Supply |
|---|---|
Use Scenario: Regulating 12V/24V/48V battery systems during engine cranking, regenerative braking, and load dump events. IC Role / Device Role / Timing Role: 4-switch buck-boost controller maintaining stable 12V output despite VIN swinging from 3.5V to 60V. Use Value: Eliminates need for backup LDOs or discrete boost stages; ±1.5% VOUT accuracy ensures reliable MCU and sensor operation. | Use Scenario: Powering industrial PLC I/O modules from unregulated 24V–48V factory bus with varying load transients. IC Role / Device Role / Timing Role: Synchronous controller delivering up to 4A at 2MHz with <100ns dead-time control for high efficiency. Use Value: 95% efficiency at 2MHz reduces heatsink size; spread spectrum avoids interference with CAN FD timing signals. |
| Telecom 48V Backup Charger | High-Frequency Portable Equipment |
Use Scenario: Charging supercapacitor banks from 48V telecom rectifiers while supporting hot-swap and hold-up. IC Role / Device Role / Timing Role: Bidirectional current-controlled regulator managing charge/discharge via ISP/ISN monitoring. Use Value: ±3% current accuracy enables precise coulomb counting; VOUT disconnect during shutdown prevents leakage. | Use Scenario: Powering portable test equipment with Li-ion battery input (3V–4.2V) and 5V/12V system rails. IC Role / Device Role / Timing Role: Single-chip solution converting battery voltage to regulated 5V/12V outputs without intermediate conversion stages. Use Value: 2MHz operation allows use of 1µH inductors; TSSOP package fits compact 2-layer PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-switch buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | Fixed 100kHz–600kHz range; no spread spectrum; lower max VIN (40V); no AEC-Q100 rating | Suitable for non-automotive industrial supplies where EMI is less constrained | Select if cost sensitivity outweighs EMI performance and automotive qualification needs |
| MPQ4332GJ-AEC1-Z | Integrated MOSFETs (40V max); fixed 2.2MHz; no ISP/ISN current monitor; no programmable fault modes | Targeted at space-constrained consumer electronics with simpler protection requirements | Select only for low-power (<2A), fixed-output designs where integration trumps flexibility |
Compared with LTC3780EFE#PBF and MPQ4332GJ-AEC1-Z, LT8390AIFE#PBF uniquely combines AEC-Q100 qualification, 60V capability, spread spectrum, and full input/output current monitoring - making it the only option for high-reliability automotive and industrial systems demanding both wide voltage range and precise telemetry.
Availability
LT8390AIFE#PBF is available at Aetrix Electronics and suitable for automotive battery management, industrial wide-input power supplies, and telecom backup charger applications requiring stable component supply and long-term lifecycle support.
Supply support for LT8390AIFE#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-VIN/VOUT DC/DC conversion in harsh environments - emphasizing seamless mode transition, low EMI, and robust fault handling for automotive and industrial power systems.
FAQ
What is the maximum input voltage supported by the LT8390AIFE#PBF?
The LT8390AIFE#PBF supports an absolute maximum input voltage of 60V on the VIN pin, with continuous operation specified from 4V to 60V. This enables direct connection to 48V industrial buses and 12V/24V automotive systems, including load dump conditions up to 60V transient. Exceeding 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT8390AIFE#PBF support both buck and boost operation in a single circuit?
Yes, the LT8390AIFE#PBF implements a true 4-switch single-inductor buck-boost topology that operates seamlessly across buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT) regions. Its proprietary peak-buck/peak-boost current mode control automatically transitions between modes without output disturbance, validated down to 0V output capability.
How is spread spectrum enabled on the LT8390AIFE#PBF?
Spread spectrum is enabled on the LT8390AIFE#PBF by connecting the SYNC/SPRD pin to INTVCC, which activates internal 25% triangle frequency modulation around the base oscillator frequency set by the RT resistor. This reduces EMI peak amplitudes without requiring external clock sources or layout changes - a key advantage over fixed-frequency alternatives.
What package type is used for the LT8390AIFE#PBF?
The LT8390AIFE#PBF uses a 28-lead plastic TSSOP package with exposed pad (FE package). The exposed pad (pin 29) must be soldered directly to the PCB ground plane to achieve θJC = 5°C/W thermal resistance and ensure reliable operation at full load. It is not offered in QFN for this temperature grade.
Is the LT8390AIFE#PBF qualified for automotive applications?
Yes, the LT8390AIFE#PBF is AEC-Q100 qualified for Grade I (–40°C to +125°C junction temperature), with full reliability testing including HTOL, temperature cycling, and ESD. It is explicitly listed in Analog Devices' automotive ordering table with #PBF lead-free finish and FE package - making it suitable for under-hood and infotainment power systems.
LT8390AIFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LT8390AIFE#PBF FAQ
1.How can I place an order for LT8390AIFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390AIFE#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 LT8390AIFE#PBF reliable?
The price and inventory of LT8390AIFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390AIFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8390AIFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390AIFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390AIFE#PBF?
LT8390AIFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390AIFE#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 LT8390AIFE#PBF?
For technical support, including LT8390AIFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390AIFE#PBF requirements.
6.How does Aetrix verify that LT8390AIFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8390AIFE#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 LT8390AIFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8390AIFE#PBF?
All LT8390AIFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390AIFE#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 LT8390AIFE#PBF part is unused and in its original packaging.
Return procedure for LT8390AIFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8390AIFE#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…
