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Analog Devices Inc. LT8228HFE#TRPBF
- Part No.:
- LT8228HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8228HFE#TRPBF.pdf
- Description:
- SWITCHING VOLTAGE REGULATORS 100
- Quantity:
- Payment:
- Shipping:
Inventory:4,068
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Product details
Overview
LT8228HFE#TRPBF from Analog Devices is a 100V bidirectional synchronous buck/boost controller supporting constant-voltage and constant-current regulation in both directions, with independent compensation networks, reverse supply protection, reverse current blocking, and fault reporting via FAULT/REPORT pins. It operates across –40°C to +150°C junction temperature and delivers programmable switching frequency from 80kHz to 600kHz.
For engineers reviewing the LT8228HFE#TRPBF datasheet, LT8228HFE#TRPBF pinout, LT8228HFE#TRPBF application, or LT8228HFE#TRPBF equivalent, key selection criteria include bidirectional current limit accuracy (±2.5%), AEC-Q100 qualification for automotive use, 38-lead TSSOP thermal performance (θJA = 25°C/W), and masterless paralleling capability for high-reliability power systems.
Technical Context
The LT8228HFE#TRPBF implements dual-loop control with separate error amplifiers for V1 and V2 terminals, enabling independent voltage and current regulation in buck (V1→V2) and boost (V2→V1) modes. Its DRXN pin determines direction automatically or via external logic, while ISHARE enables masterless current sharing among parallel controllers without synchronization signals.
Protection architecture includes dedicated gate drivers (DG1/DG2) for external high-side MOSFETs at both terminals, with adjustable timer-based short-circuit protection on the boost output and ±40V negative voltage tolerance. Internal diagnostics monitor switching MOSFET shorts, inrush transients, and thermal faults, reporting through open-drain FAULT and REPORT pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 6V to 100V on both V1 and V2 terminals - supports wide-input industrial and automotive battery systems including dual-battery architectures. |
| Switching Frequency | 80kHz to 600kHz, programmable via RT resistor or synchronizable to external clock - enables EMI optimization and inductor size reduction. |
| Current Regulation Accuracy | ±2.5% over temperature - ensures precise charge/discharge current control in battery backup and energy storage applications. |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Package Thermal Resistance | θJA = 25°C/W (38-lead TSSOP with exposed pad soldered to PCB) - enables >40W continuous power dissipation with standard 2-layer board layout. |
| Fault Reporting Interface | Open-drain FAULT and REPORT pins with <0.35V low-level voltage at 2mA - simplifies integration into microcontroller interrupt and status monitoring circuits. |
| AEC-Q100 Grade | Grade H (–40°C to +150°C) - certified for automotive powertrain and chassis applications requiring extended temperature reliability. |
Pinout & Package
LT8228HFE#TRPBF is housed in a 38-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 39 = GND), rated for 150°C maximum junction temperature and optimized for high-power density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SNS1P/SNS1N | V1 current sense differential input | Measures bidirectional current at V1 terminal with ±80mV full-scale range; enables reverse current blocking in buck mode. |
| SNS2P/SNS2N | V2 current sense differential input | Measures bidirectional current at V2 terminal; supports programmable inrush limiting during boost startup. |
| DG1/DS1 | V1 protection MOSFET gate driver output and source reference | Drives external high-side N-channel MOSFET at V1; provides 10V gate drive swing with ±110mA sink capability. |
| DG2/DS2 | V2 protection MOSFET gate driver output and source reference | Drives external high-side N-channel MOSFET at V2; features adjustable timer-based short-circuit protection. |
| DRXN | Direction control and status output | Logic-high = buck mode (V1→V2); logic-low = boost mode (V2→V1); also reports active mode to external logic. |
| ISHARE | Masterless current share bus | Enables parallel operation of multiple LT8228HFE#TRPBF controllers without master clock; maintains ±4% current sharing accuracy. |
| FAULT/REPORT | Open-drain fault and diagnostic reporting outputs | FAULT asserts on critical faults (e.g., MOSFET short); REPORT provides detailed status (e.g., UV/OV, thermal warning). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current regulation | Independent ISET1P/ISET1N and ISET2P/ISET2N inputs enable simultaneous precision control of input/output current in both buck and boost directions. |
| Reverse current protection | Automatic DG1 turn-off when VSNS1P–SNS1N falls below –3mV prevents battery discharge back into supply during buck operation. |
| Boost output short protection | Adjustable TMR pin timer disables boost output after programmable delay upon overcurrent detection, preventing MOSFET destruction. |
| Input negative voltage tolerance | DS1 and DS2 pins withstand –40V, allowing safe connection to reversed batteries or transient-negative rail conditions. |
| Programmable spread spectrum | Reduces peak EMI by modulating switching frequency up to ±10% around fPROG, easing compliance with CISPR 25 Class 5 automotive standards. |
Applications
| Automotive Dual-Battery Systems | Industrial UPS Backup Power |
|---|---|
Use Scenario: Seamless power handoff between starter battery (V1) and auxiliary battery (V2) during engine start-stop cycles and load-dump events. IC Role / Device Role / Timing Role: Bidirectional controller managing energy flow direction, voltage regulation, and reverse current blocking at both terminals. Use Value: Eliminates need for discrete OR-ing diodes or relays, reducing conduction loss by >70% and enabling compact, solid-state battery isolation. |
Use Scenario: Maintaining stable 48V DC output during AC mains failure using a 24V–54V input battery bank with fast transition (<100µs) between grid and backup modes. IC Role / Device Role / Timing Role: Constant-voltage buck controller (grid→battery) and constant-current boost charger (battery→load) with shared sensing and protection. Use Value: Achieves >96% efficiency at 40A buck and >94% at 10A boost, extending runtime while meeting UL 1778 hold-up time requirements. |
| High-Reliability N+1 Redundant Supplies | Power Interrupt Protection for Critical Loads |
Use Scenario: Paralleling three LT8228HFE#TRPBF-controlled 5kW modules in telecom rectifier systems where single-point failure must not disrupt output. IC Role / Device Role / Timing Role: Masterless current-sharing controller ensuring balanced load distribution across all modules without clock synchronization. Use Value: Delivers ±4% current matching across modules under dynamic load steps, eliminating hot-spotting and enabling plug-and-play redundancy. |
Use Scenario: Protecting FPGA-based control systems from brownouts during generator switchover in datacenter PDUs with <1ms interruption tolerance. IC Role / Device Role / Timing Role: Fast-direction-switching controller that transitions from buck (grid→capacitor bank) to boost (bank→load) within 50µs of input loss. Use Value: Guarantees uninterrupted 12V/20A output for 20ms using 2200µF hold-up capacitance, meeting IEC 61000-4-11 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional buck/boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7820EUFD#PBF | Fixed 500kHz frequency, no reverse current protection, no V2-side inrush limiting, 60V max rating | Limited to unidirectional high-efficiency DC/DC conversion; unsuitable for battery backup or dual-rail isolation | Select only for cost-sensitive, fixed-frequency 48V intermediate bus applications without fault resilience requirements |
| MPQ4282GLED-AEC1-Z | Integrated 100V MOSFETs, 3A max output, no masterless paralleling, no TMR-based short protection | Targeted at low-power automotive infotainment rails; lacks scalability for >10A systems | Choose for space-constrained 12V→5V/3.3V point-of-load designs where integrated FETs reduce BOM count |
Compared with LTC7820EUFD#PBF and MPQ4282GLED-AEC1-Z, the LT8228HFE#TRPBF uniquely combines 100V bidirectional operation, reverse current blocking, masterless paralleling, and automotive-grade thermal robustness - making it the only option for scalable, fault-tolerant dual-battery and N+1 redundant systems.
Availability
LT8228HFE#TRPBF is available at Aetrix Electronics and suitable for automotive dual-battery systems, industrial UPS backup power, and high-reliability N+1 redundant supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8228HFE#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 industrial, automotive, communications, and healthcare markets with precision power, sensing, and timing solutions.
The LT8228HFE#TRPBF belongs to Analog Devices' Power by Linear™ high-voltage controller family, engineered specifically for fault-resilient, bidirectional energy transfer in automotive and industrial battery systems demanding AEC-Q100 qualification and extended temperature operation.
FAQ
What is the maximum operating junction temperature for the LT8228HFE#TRPBF?
The LT8228HFE#TRPBF is rated for a maximum junction temperature of +150°C and is fully specified across –40°C to +150°C. This Grade H qualification meets AEC-Q100 requirements for under-hood automotive applications and enables reliable operation in high-ambient industrial environments without derating.
Does the LT8228HFE#TRPBF support automatic direction detection between buck and boost modes?
Yes, the LT8228HFE#TRPBF supports automatic direction detection via its DRXN pin, which transitions low for boost mode (V2→V1) and high for buck mode (V1→V2) based on relative voltage and current conditions. External control is also supported by driving DRXN directly, enabling deterministic sequencing in complex power architectures.
How does the LT8228HFE#TRPBF implement reverse current protection in buck mode?
In buck mode, the LT8228HFE#TRPBF monitors the SNS1P–SNS1N differential voltage; when it falls below –3mV (indicating reverse current flow from V2 to V1), the controller immediately disables DG1 to turn off the V1-side protection MOSFET, blocking reverse conduction while maintaining system isolation.
Can multiple LT8228HFE#TRPBF controllers be paralleled without a master clock signal?
Yes, the LT8228HFE#TRPBF features masterless, fault-tolerant current sharing via its ISHARE pin. Multiple units can be connected in parallel with no synchronization required, maintaining ±4% current sharing accuracy even if one controller fails or is hot-plugged, making it ideal for N+1 redundant power systems.
What protection features does the LT8228HFE#TRPBF provide against boost output short circuits?
The LT8228HFE#TRPBF provides boost output short-circuit protection via its TMR pin: upon overcurrent detection, an internal timer begins counting, and if the fault persists beyond the programmed delay, the boost output is disabled. This prevents destructive power dissipation in external MOSFETs during sustained shorts.
LT8228HFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (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:
- 2
- Voltage - Supply (Vcc/Vdd):
- 6V ~ 100V
- Frequency - Switching:
- 80kHz ~ 600kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT8228HFE#TRPBF FAQ
1.How can I place an order for LT8228HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8228HFE#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 LT8228HFE#TRPBF reliable?
The price and inventory of LT8228HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8228HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8228HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8228HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8228HFE#TRPBF?
LT8228HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8228HFE#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 LT8228HFE#TRPBF?
For technical support, including LT8228HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8228HFE#TRPBF requirements.
6.How does Aetrix verify that LT8228HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8228HFE#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 LT8228HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8228HFE#TRPBF?
All LT8228HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8228HFE#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 LT8228HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8228HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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