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Analog Devices Inc. LT8390HFE#TRPBF
- Part No.:
- LT8390HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390HFE#TRPBF.pdf
- Description:
- 60V SYNCHRONOUS 4-SWITCH BUCK-BO
- Quantity:
- Payment:
- Shipping:
Inventory:1,975
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Product details
Overview
LT8390HFE#TRPBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V to 60V input and 0V to 60V output, with ±1.5% output voltage accuracy, 150kHz–650kHz adjustable switching frequency, and AEC-Q100 qualification for automotive applications. It enables seamless buck/buck-boost/boost transitions in high-reliability battery charger and voltage regulator systems.
For engineers reviewing the LT8390HFE#TRPBF datasheet, LT8390HFE#TRPBF pinout, LT8390HFE#TRPBF application, or LT8390HFE#TRPBF equivalent, key selection criteria include VIN/VOUT region transition thresholds (e.g., buck-boost to boost at VIN/VOUT = 0.75), peak-buck/peak-boost current mode control implementation, spread spectrum EMI reduction capability, and high-side PMOS load switch driver integration.
Technical Context
The LT8390HFE#TRPBF implements ADI's proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN) and dual independent gate drivers (TG1/BG1 for buck side, TG2/BG2 for boost side). It dynamically selects between four operating states based on real-time VIN/VOUT ratio - peak-buck in buck region, peak-buck in buck-boost region, peak-boost in buck-boost region, and peak-boost in boost region - with hysteresis to prevent mode chattering.
Its control architecture integrates an internal 5V LDO (INTVCC), 2V reference (VREF), error amplifier (VC), and programmable current limit via CTRL pin (0.3V–1.35V linear range mapping to 5mV–100mV ISP-ISN threshold). Spread spectrum modulation (±15% triangle) is enabled by tying SYNC/SPRD to INTVCC, reducing EMI without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide-input automotive battery (9V–16V nominal) and industrial rail (24V/48V) without pre-regulation. |
| VOUT Range | 0V to 60V - enables bidirectional regulation for supercapacitor charging and battery backup systems. |
| Output Voltage Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable CV/CC battery charging and precision system rails. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT resistor or external sync clock) - balances efficiency, size, and EMI in compact layouts. |
| Current Sense Accuracy | ±3% for input/output current monitoring (ISP/ISN) - enables accurate battery charge/discharge current measurement. |
| Operating Junction Temp | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive use. |
| Package | 28-Lead TSSOP with exposed pad - provides θJC = 5°C/W thermal path for high-power operation up to 48W. |
Pinout & Package
LT8390HFE#TRPBF uses a 28-lead plastic TSSOP package with exposed GND pad (Pin 29), requiring soldering to PCB for thermal and electrical integrity. θJA = 30°C/W, θJC = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1, BG2 | Buck/Boost bottom gate drivers | Drive N-channel MOSFETs from GND to INTVCC (5V); enable synchronous rectification for >98% efficiency. |
| TG1, TG2 | Buck/Boost top gate drivers | Drive N-channel MOSFETs from SWx to BSTx; require bootstrap capacitors for high-side gate bias. |
| LSP/LSN | Buck-side inductor current sense inputs | Kelvin-connected to RSENSE for accurate peak-current-mode control across all operating regions. |
| ISP/ISN | Input/output current monitor inputs | Measure system-level current (e.g., battery charge current) with ±3% accuracy and ISMON scaling (×10 + 0.25V). |
| LOADEN / LOADTG | High-side PMOS load switch control | Enable/disable external PMOS FET; LOADTG provides buffered inverted drive referenced to VOUT (not GND). |
| SYNC/SPRD | Frequency control input | GND = fixed frequency; INTVCC = ±15% triangle spread spectrum; external clock = synchronization to system master. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters; reduces BOM count and board area in space-constrained designs. |
| Seamless region transitions | No output disturbance during VIN/VOUT crossover (e.g., cold-crank 6V → 14V automotive start-stop); maintains regulation through buck→buck-boost→boost. |
| Integrated bootstrap diodes (BST1/BST2) | Removes two external Schottky diodes; simplifies layout and improves reliability in high-vibration environments. |
| VOUT-disconnected shutdown | Isolates output from input during EN/UVLO low state - prevents backfeed and supports hot-swap compliance. |
| Programmable fault response | Short-circuit protection with user-selectable hiccup (no resistor), latch-off (499kΩ), or keep-running (100kΩ) via SS pin resistor. |
Applications
| Automotive Start-Stop Systems | Industrial 24V/48V Backup Power |
|---|---|
Use Scenario: Regulates 12V system rail during engine cranking (VIN drops to 6V) and alternator overvoltage (VIN rises to 16V), maintaining stable 12V output for infotainment and ADAS modules. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller with AEC-Q100 Grade H qualification and –40°C to +150°C operation. Use Value: Eliminates voltage droop or overshoot during transient events; supports ISO 16750-2 pulse testing without derating. | Use Scenario: Powers critical PLC I/O modules from either 24V main supply or 48V supercapacitor bank during AC mains failure. IC Role / Device Role / Timing Role: Bidirectional voltage regulator enabling seamless switchover between primary and backup sources without output interruption. Use Value: Achieves <10µs transition time between sources; supports 48W continuous output with <1% regulation deviation. |
| Battery-Powered Test Equipment | Telecom Remote Radio Units |
Use Scenario: Supplies 5V/3A and 12V/2A rails from a single 3S Li-ion pack (9V–12.6V), adapting to changing cell voltage during discharge. IC Role / Device Role / Timing Role: Wide-input buck-boost controller with programmable current limits and soft-start (SS pin) for inrush control. Use Value: Maintains constant output despite 30% VIN sag; avoids brownout resets in portable instrumentation. | Use Scenario: Generates stable 28V bias for GaN power amplifiers from fluctuating 48V telecom rectifier bus (36V–72V range). IC Role / Device Role / Timing Role: High-efficiency (98%) 4-switch controller with spread spectrum EMI reduction for FCC Class B compliance. Use Value: Reduces conducted EMI peaks by >10dB; eliminates need for external EMI filters in dense RF enclosures. |
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 |
|---|---|---|---|
| LT8705EFE#TRPBF | Single-ended (non-4-switch) buck-boost; requires external flyback diode; no integrated ISP/ISN current monitor. | Lower cost for non-bidirectional applications; lacks seamless VIN/VOUT crossover and ±3% current sensing. | Select when only unidirectional power flow is needed and current monitoring is handled externally. |
| MPQ4333GQ-AEC1-Z | Monolithic 4-switch buck-boost IC (integrated MOSFETs); max 3.5A output; 4.5V–36V input; no AEC-Q100 Grade H rating. | Smaller solution size but limited to lower power; not rated for 150°C junction temperature. | Select for space-constrained 24V automotive modules where 150°C operation is not required. |
Compared with LT8390HFE#TRPBF, LT8705EFE#TRPBF offers lower BOM cost but sacrifices seamless region transitions and integrated current monitoring, while MPQ4333GQ-AEC1-Z integrates power stages but cannot support 60V input or 150°C operation - making LT8390HFE#TRPBF the only option meeting full automotive under-hood requirements with bidirectional regulation.
Availability
LT8390HFE#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial backup power supplies, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8390HFE#TRPBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT8390 product line delivers robust, high-efficiency 4-switch buck-boost controllers for demanding applications where input voltage may fall below, rise above, or equal the output - especially in automotive and industrial power systems requiring AEC-Q100 qualification and wide temperature operation.
FAQ
What is the maximum supported input voltage for the LT8390HFE#TRPBF?
The LT8390HFE#TRPBF supports an absolute maximum input voltage of 60V on the VIN pin, with guaranteed operation across its full 4V to 60V input range. This allows direct connection to 48V industrial buses and 12V/24V automotive systems including cold-crank and load-dump transients when properly clamped.
Does the LT8390HFE#TRPBF support spread spectrum frequency modulation?
Yes, the LT8390HFE#TRPBF supports triangle spread spectrum modulation with ±15% deviation around the programmed oscillator frequency when the SYNC/SPRD pin is tied to INTVCC. This feature reduces peak EMI emissions without requiring external clock sources or complex filtering.
How does the LT8390HFE#TRPBF handle transitions between buck, buck-boost, and boost modes?
The LT8390HFE#TRPBF uses proprietary peak-buck/peak-boost current mode control with hysteresis-based region detection. Transition thresholds (e.g., buck-boost to boost at VIN/VOUT = 0.75) ensure seamless, low-noise mode changes without output disturbance - verified across temperature and load conditions.
What is the purpose of the LOADEN and LOADTG pins on the LT8390HFE#TRPBF?
The LOADEN pin enables or disables an external high-side PMOS load switch; LOADTG provides a buffered, inverted gate drive referenced to VOUT (not GND), allowing safe turn-on/turn-off of the PMOS FET. When LOADEN is low, LT8390HFE#TRPBF disconnects VOUT from VIN and disables all power switches.
Is the LT8390HFE#TRPBF qualified for automotive applications?
Yes, the LT8390HFE#TRPBF is AEC-Q100 qualified for automotive applications with Grade H temperature rating (–40°C to +150°C junction), making it suitable for under-hood use in engine control, ADAS, and start-stop systems where high reliability and thermal robustness are mandatory.
LT8390HFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT8390HFE#TRPBF FAQ
1.How can I place an order for LT8390HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390HFE#TRPBF 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 LT8390HFE#TRPBF reliable?
The price and inventory of LT8390HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390HFE#TRPBF?
LT8390HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390HFE#TRPBF 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 LT8390HFE#TRPBF?
For technical support, including LT8390HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390HFE#TRPBF requirements.
6.How does Aetrix verify that LT8390HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390HFE#TRPBF 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 LT8390HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390HFE#TRPBF?
All LT8390HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390HFE#TRPBF, 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 LT8390HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8390HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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