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Analog Devices Inc. LT8228EFE#TRPBF
- Part No.:
- LT8228EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8228EFE#TRPBF.pdf
- Description:
- SWITCHING VOLTAGE REGULATORS 100
- Quantity:
- Payment:
- Shipping:
Inventory:3,382
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Product details
Overview
LT8228EFE#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 current protection at V1, programmable inrush limiting at V2, and AEC-Q100 qualification for automotive dual-battery systems.
For engineers reviewing the LT8228EFE#TRPBF datasheet, LT8228EFE#TRPBF pinout, LT8228EFE#TRPBF application, or LT8228EFE#TRPBF equivalent, key selection criteria include bidirectional current limit accuracy (±2.5%), 80–600kHz programmable switching frequency, ±1.0% FB voltage tolerance over temperature, integrated protection MOSFET gate drivers, and masterless current sharing across parallel controllers.
Technical Context
The LT8228EFE#TRPBF implements dual-loop control with separate error amplifiers for voltage (FB1/FB2) and current (ISET1P/ISET1N/ISET2P/ISET2N), each with 0.8ms transconductance and 1.210V reference. Its DRXN pin determines power flow direction-high for buck, low for boost-and enables seamless mode transitions without external sequencing.
Protection logic integrates dedicated gate drivers (DG1/DG2) for external high-side MOSFETs at both terminals, with undervoltage lockout (3.8–5.0V), negative voltage cutoff (–1.7V), and adjustable timer-based short-circuit protection on the boost output. Fault reporting occurs via open-drain FAULT and REPORT pins with 0.35V low-level threshold under 2mA load.
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 architectures. |
| Switching Frequency | 80kHz to 600kHz, programmable via RT resistor or synchronizable to external clock-enables EMI optimization and inductor size reduction. |
| Feedback Accuracy | ±1.0% over temperature for FB1/FB2-ensures stable output voltage regulation across thermal stress in vehicle cabins or industrial enclosures. |
| Current Regulation Error | ±2.5% for all ISET inputs-guarantees precise bidirectional current limiting critical for battery charge/discharge balancing. |
| Current Sharing Error | ±4% in buck or boost mode with ISHARE-allows N+1 redundant configurations without calibration or master controller. |
| Gate Drive Capability | 10V swing (DG1/DG2), ±80mA sink/source-directly drives high-threshold SiC or GaN MOSFETs without level-shifting circuitry. |
| Temperature Grade | –40°C to +125°C junction-qualified per AEC-Q100 Grade E for under-hood and chassis-mounted power systems. |
Pinout & Package
LT8228EFE#TRPBF is housed in a 38-lead plastic TSSOP package (FE) with exposed pad (Pin 39) soldered to PCB ground for thermal management. θJA = 25°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SNS1P/SNS1N | V1 current sense differential input | Measures bidirectional current at V1 terminal; supports reverse current detection in buck mode. |
| SNS2P/SNS2N | V2 current sense differential input | Enables programmable inrush limiting and output short protection in boost mode. |
| DG1/DS1 | V1 protection MOSFET gate driver and source | Controls high-side NMOS at V1; includes UVLO, negative voltage cutoff, and fast turn-off for fault isolation. |
| DG2/DS2 | V2 protection MOSFET gate driver and source | Drives high-side NMOS at V2; provides adjustable timer-based short-circuit protection during boost startup. |
| DRXN | Direction control input | Logic-high selects buck mode (V1→V2); logic-low selects boost mode (V2→V1); auto-detect capability available. |
| ISHARE | Current sharing bus | Analog bus for masterless paralleling-voltage represents average current across multiple LT8228EFE#TRPBF units. |
| FAULT/REPORT | Fault status outputs | Open-drain signals with 0.35V max low-level voltage under 2mA load-interface directly with microcontroller GPIOs. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional reverse current protection | Prevents backfeed from V2 to V1 in buck mode using DG1-controlled MOSFET, eliminating need for external diodes or OR-ing controllers. |
| Programmable boost output short protection | TMR pin configures adjustable timer circuit breaker that disables DG2 after user-defined delay during V2 short events. |
| Masterless current sharing | ISHARE pin enables plug-and-play paralleling of up to N controllers with ±4% current matching-no clock synchronization or master unit required. |
| Independent compensation networks | Separate VC1/VC2 pins allow individual loop tuning for V1 and V2 regulation paths-critical for asymmetric buck/boost gain requirements. |
| AEC-Q100 qualified | Grade E (–40°C to +125°C) qualification ensures reliability in automotive dual-battery systems including start-stop and regenerative braking applications. |
Applications
| Automotive Dual-Battery Systems | High-Power System Backup |
|---|---|
|
Use Scenario: Seamless power transfer between 12V starter battery and 48V mild-hybrid rail during engine cranking or regenerative braking. IC Role / Device Role / Timing Role: Bidirectional buck/boost controller regulating voltage and current flow between two isolated battery domains with automatic direction detection. Use Value: Eliminates need for separate buck and boost ICs; ±2.5% current regulation ensures balanced state-of-charge across batteries. |
Use Scenario: Maintaining uninterrupted power to mission-critical loads (e.g., servers, medical devices) during AC mains failure using Li-ion or supercapacitor banks. IC Role / Device Role / Timing Role: Constant-current/constant-voltage controller managing charge/discharge cycles between backup storage and system bus. Use Value: 100V rating supports high-ratio conversion (e.g., 12V ↔ 48V); programmable inrush limiting prevents tripping upstream breakers during cold start. |
| "N+1" Redundant Power Supplies | Power Interrupt Protection Systems |
|
Use Scenario: Parallel operation of multiple DC-DC stages in telecom rectifiers or industrial PLC power modules to achieve fault-tolerant output current capacity. IC Role / Device Role / Timing Role: Masterless current-sharing controller enabling dynamic addition/removal of power stages while maintaining ±4% load balance. Use Value: No single point of failure; eliminates need for centralized current-sharing IC or complex digital control firmware. |
Use Scenario: Protecting sensitive electronics from brownouts or surges in factory automation equipment by rapidly switching between primary and auxiliary supplies. IC Role / Device Role / Timing Role: Fast-direction-switching controller with <150ns minimum on-time and integrated fault diagnostics (FAULT/REPORT pins). Use Value: Sub-microsecond response to supply faults; reverse current blocking prevents backfeed into failed sources. |
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 |
|---|---|---|---|
| LT8708EFE#TRPBF | Lacks bidirectional current monitoring; no ISET1N/ISET2N pins; only unidirectional current limit (V1→V2). | Suitable for unidirectional energy transfer (e.g., solar MPPT to battery), not battery-to-battery balancing. | Select when only one-way power flow is needed and cost sensitivity outweighs bidirectional feature set. |
| MPQ4269GJ-AEC1-Z | Max 60V input; no ISHARE or masterless paralleling; fixed 400kHz switching frequency; no DRXN auto-detect. | Targeted at lower-voltage automotive ADAS cameras or infotainment, not high-power dual-rail systems. | Choose for compact 60V designs where AEC-Q100 compliance is required but 100V range and current sharing are unnecessary. |
Compared with LT8228EFE#TRPBF, LT8708EFE#TRPBF omits reverse current regulation and autonomous direction control, while MPQ4269GJ-AEC1-Z sacrifices voltage headroom and scalability-making LT8228EFE#TRPBF uniquely suited for high-reliability, high-voltage, bidirectionally regulated systems requiring redundancy and fault resilience.
Availability
LT8228EFE#TRPBF is available at Aetrix Electronics and suitable for automotive dual-battery systems, high-power system backup, and "N+1" redundant power supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8228EFE#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 precision instrumentation, industrial automation, and automotive markets since 1965.
The LT8228 product line delivers robust bidirectional power control for next-generation vehicle electrification and industrial energy storage, emphasizing fault resilience, thermal ruggedness, and seamless integration into safety-critical systems.
FAQ
What is the maximum operating voltage supported by the LT8228EFE#TRPBF?
The LT8228EFE#TRPBF supports up to 100V on both V1 and V2 terminals, with absolute maximum ratings extending to 100V on DS1, DS2, SNS1P/SNS1N, SNS2P/SNS2N, and SW pins. This enables direct interface with 48V mild-hybrid rails, 60V industrial buses, and legacy 12V/24V systems without external voltage clamping.
How does the LT8228EFE#TRPBF handle reverse current protection in buck mode?
In buck mode (DRXN = high), the LT8228EFE#TRPBF monitors V1 current via SNS1P/SNS1N and disables DG1 if reverse current exceeds –3.0mV threshold across RSNS1, cutting off the V1-side MOSFET within nanoseconds. This prevents backfeed from V2 to V1 without requiring external Schottky diodes or discrete protection ICs.
Can the LT8228EFE#TRPBF be used in parallel for higher current applications?
Yes-the LT8228EFE#TRPBF features masterless, fault-tolerant current sharing via the ISHARE pin. When multiple LT8228EFE#TRPBF units are connected in parallel, their ISHARE pins form an analog bus that equalizes output current to within ±4%, even during hot-plug insertion or removal of individual controllers.
What is the purpose of the TMR pin on the LT8228EFE#TRPBF?
The TMR pin on the LT8228EFE#TRPBF sets the timeout duration for boost output short-circuit protection. When a short is detected at V2, the LT8228EFE#TRPBF disables DG2 after the delay defined by the external RC network on TMR-preventing thermal runaway while allowing brief inrush events during normal startup.
Does the LT8228EFE#TRPBF support spread spectrum frequency modulation?
Yes-the LT8228EFE#TRPBF integrates spread spectrum modulation with programmable center frequency (fPROG) and deviation range (fSPSC,MIN/MAX). With RRT = 100kΩ, it achieves 65–145kHz variation around 100kHz base frequency, reducing peak EMI emissions without compromising regulation stability or transient response.
LT8228EFE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT8228EFE#TRPBF FAQ
1.How can I place an order for LT8228EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8228EFE#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 LT8228EFE#TRPBF reliable?
The price and inventory of LT8228EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8228EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8228EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8228EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8228EFE#TRPBF?
LT8228EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8228EFE#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 LT8228EFE#TRPBF?
For technical support, including LT8228EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8228EFE#TRPBF requirements.
6.How does Aetrix verify that LT8228EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8228EFE#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 LT8228EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8228EFE#TRPBF?
All LT8228EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8228EFE#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 LT8228EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8228EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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