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Analog Devices Inc. LT8228IFE#TRPBF
- Part No.:
- LT8228IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8228IFE#TRPBF.pdf
- Description:
- SWITCHING VOLTAGE REGULATORS 100
- Quantity:
- Payment:
- Shipping:
Inventory:2,595
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Product details
Overview
LT8228IFE#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 and V2 terminals, and integrated MOSFET gate drivers for input/output protection. It operates across 6V–100V input/output ranges, delivers ±1.0% feedback voltage tolerance over temperature, and is AEC-Q100 qualified for automotive dual-battery systems.
For engineers reviewing the LT8228IFE#TRPBF datasheet, LT8228IFE#TRPBF pinout, LT8228IFE#TRPBF application, or LT8228IFE#TRPBF equivalent, this page provides verified technical context on bidirectional power flow control, programmable current limits (±2.5% regulation error), fault reporting via FAULT/REPORT pins, and masterless current sharing for N+1 redundant supplies - all critical for high-reliability battery backup and supply stabilization designs.
Technical Context
The LT8228IFE#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 direction (buck when high, boost when low), enabling automatic or external mode selection without external logic.
Protection is hardware-based: DG1/DG2 gate drivers deliver 8–12.5V swing relative to DS1/DS2, with undervoltage lockout (3.8–5.0V), negative voltage cutoff (–1.7V), and pull-down strength of –80mA to rapidly disable external MOSFETs during faults like switching FET shorts or –40V reverse input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 6V to 100V on both V1 and V2 terminals - supports wide-range battery backup, industrial 24–48V systems, and automotive 12V/48V dual-rail architectures. |
| Feedback Accuracy | ±1.0% over temperature - ensures stable output voltage regulation under thermal stress in engine bay or industrial enclosures. |
| Current Regulation Error | ±2.5% in buck/boost modes - enables precise charge/discharge current control for Li-ion or lead-acid battery management. |
| Switching Frequency | 80kHz to 600kHz, programmable via RT resistor or synchronizable to external clock - balances efficiency vs. size for 10µH–47µH inductors. |
| Gate Drive Strength | TG/BG drivers with 1.0Ω pull-down resistance and 50ns rise/fall times - directly drives 10nC gate charge MOSFETs without external buffers. |
| Temperature Grade | –40°C to +125°C junction - certified for automotive I-grade operation per AEC-Q100 Rev H. |
| Fault Reporting | Dedicated FAULT (open-drain, 0.35V max @ 2mA) and REPORT (open-drain, 0.35V max @ 2mA) pins - enables real-time system-level diagnostics without microcontroller polling. |
Pinout & Package
The LT8228IFE#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). Package dimensions comply with JEDEC MO-153AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SNS1P/SNS1N | V1-side current sense differential inputs | Measure bidirectional current at V1 terminal; support ±80mV sensing range with <1µA bias current for high-accuracy monitoring. |
| SNS2P/SNS2N | V2-side current sense differential inputs | Enable independent current regulation and monitoring on V2 side; compatible with Kelvin-sense PCB layout for minimal noise coupling. |
| DRXN | Direction control input | High = buck mode (V1→V2), low = boost mode (V2→V1); also used for automatic direction detection based on voltage polarity. |
| FAULT / REPORT | Open-drain fault status outputs | Active-low signals indicating overcurrent, overvoltage, undervoltage, or thermal fault; REPORT provides detailed diagnostic code via pulse-width encoding. |
| DG1 / DS1 / V1D | V1-terminal protection MOSFET driver | DG1 drives gate of external high-side protection FET; DS1 is source connection; V1D is V1-domain supply - isolates V1 during faults and blocks reverse current. |
| DG2 / DS2 / BIAS | V2-terminal protection MOSFET driver | DG2 drives gate of V2-side protection FET; DS2 is source; BIAS powers internal regulators - enables independent V2-side inrush limiting and short-circuit protection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current regulation | Independent ISET1P/ISET1N (V1) and ISET2P/ISET2N (V2) pins allow simultaneous programming of forward/reverse current limits with ±2.5% accuracy. |
| Masterless current sharing | ISHARE pin enables N+1 parallel operation with ±4% current sharing error - eliminates master controller and single point of failure in high-power systems. |
| Reverse voltage protection | Hardware-enforced –40V tolerance on DS1/DS2 pins with automatic DG1/DG2 shutdown below –1.7V - protects against accidental reverse battery connection. |
| Programmable inrush limiting | Adjustable timer-based circuit breaker on V2 output (TMR pin) limits boost-mode inrush current - prevents fuse blowing during cold-start battery backup engagement. |
| Integrated diagnostics | FAULT pin asserts on any critical fault; REPORT pin outputs encoded pulses indicating specific fault type (e.g., UV1, OV2, TG short) - reduces firmware complexity in safety-critical applications. |
Applications
| Automotive Dual-Battery Systems | Industrial Power Backup |
|---|---|
Use Scenario: Seamless power handoff between 12V starter battery and 48V mild-hybrid rail during engine start-stop cycles. IC Role / Device Role / Timing Role: Bidirectional controller regulating power flow from 48V rail to 12V system (boost) or vice versa (buck), with reverse current blocking during cranking. Use Value: Prevents 12V brownout during cold cranking by delivering up to 40A at 14V from 48V rail, while maintaining ±1.0% output voltage stability. | Use Scenario: Maintaining PLC or DCS controller uptime during AC mains failure using supercapacitor or LiFePO₄ backup bank. IC Role / Device Role / Timing Role: Constant-current charger for backup battery during normal operation; constant-voltage discharger during outage - managed via FB1/FB2 loops. Use Value: Enables >95% peak efficiency at 20A load, reducing thermal load in sealed industrial cabinets and extending backup runtime. |
| N+1 Redundant Telecom Supplies | Power Interrupt Protection System |
Use Scenario: Parallel operation of three LT8228IFE#TRPBF controllers feeding a 54V telecom shelf bus from multiple 48V rectifiers. IC Role / Device Role / Timing Role: Masterless current sharing via ISHARE pin ensures balanced loading across modules without communication bus or timing skew concerns. Use Value: Achieves ±4% current matching across units even with ±5% RSET resistor tolerance, eliminating need for manual trimming or digital calibration. | Use Scenario: Protecting medical imaging equipment from data corruption during sub-cycle AC dropout events. IC Role / Device Role / Timing Role: Fast-acting reverse current blocker (DG1/DG2 response <1µs) isolating main supply from backup during grid transients. Use Value: Blocks reverse current within 200ns of fault detection, preventing capacitor discharge into failed upstream converter and preserving hold-up time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7820EUFD#PBF | Fixed-ratio hybrid converter (no inductor), 40V max, no bidirectional current regulation, no reverse current protection | Only suitable for unidirectional, fixed-ratio step-down where isolation and simplicity outweigh regulation flexibility | Select only if topology is strictly fixed-ratio and voltage range ≤40V; cannot replace LT8228IFE#TRPBF in battery backup or dual-rail applications. |
| MPQ4282GR-A | 40V max, no reverse voltage protection, no ISHARE current sharing, no AEC-Q100 qualification | Limited to consumer-grade 12V/24V systems without automotive or industrial reliability requirements | Acceptable for cost-sensitive non-automotive designs requiring basic buck-boost, but lacks fault reporting, reverse protection, and precision current control. |
Compared with LTC7820EUFD#PBF and MPQ4282GR-A, the LT8228IFE#TRPBF uniquely combines 100V operation, bidirectional current regulation with ±2.5% error, hardware reverse current blocking, and AEC-Q100 qualification - making it the only viable option for automotive dual-battery and industrial N+1 redundant systems demanding functional safety and long-term reliability.
Availability
LT8228IFE#TRPBF is available at Aetrix Electronics and suitable for automotive dual-battery systems, industrial power backup, N+1 redundant telecom supplies, and power interrupt protection systems requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LT8228IFE#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.
The LT8228IFE#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-voltage bidirectional energy transfer in automotive, industrial, and telecom infrastructure - emphasizing fault resilience, precision regulation, and seamless mode transitions.
FAQ
What is the maximum input voltage supported by the LT8228IFE#TRPBF?
The LT8228IFE#TRPBF supports up to 100V on both V1 and V2 terminals, with absolute maximum ratings of –40V to +100V on DS1 and DS2 pins. This enables direct interface with 48V automotive rails, 60V industrial buses, and legacy 100V telecom systems without external voltage clamping.
Does the LT8228IFE#TRPBF support automatic bidirectional mode switching?
Yes, the LT8228IFE#TRPBF supports automatic direction detection via the DRXN pin. When left floating or configured with appropriate pull-up/down resistors, it senses relative voltages at V1 and V2 to autonomously select buck or boost mode - eliminating need for external microcontroller intervention during power path reconfiguration.
How does the LT8228IFE#TRPBF implement reverse current protection?
The LT8228IFE#TRPBF uses dedicated DG1 and DG2 gate drivers to control external high-side protection MOSFETs. When reverse current is detected (e.g., –3.0mV across SNS1P/SNS1N in buck mode), it disables DG1 within 200ns, physically isolating V1 from V2 and preventing battery drain or supply backfeed - a hardware-level feature independent of loop response time.
Can multiple LT8228IFE#TRPBF controllers be paralleled for higher current capacity?
Yes, the LT8228IFE#TRPBF features masterless, fault-tolerant current sharing via the ISHARE pin. Up to six units can operate in parallel with ±4% current matching accuracy, and removal of any unit during operation does not disrupt regulation - ideal for N+1 redundant power systems requiring continuous uptime.
Is the LT8228IFE#TRPBF qualified for automotive applications?
Yes, the LT8228IFE#TRPBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to +125°C), with built-in diagnostics including FAULT and REPORT pins, thermal shutdown at 150°C, and robust ESD protection. It is explicitly designated for dual-battery automotive systems and meets stringent automotive reliability and test requirements.
LT8228IFE#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
LT8228IFE#TRPBF FAQ
1.How can I place an order for LT8228IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8228IFE#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 LT8228IFE#TRPBF reliable?
The price and inventory of LT8228IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8228IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8228IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8228IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8228IFE#TRPBF?
LT8228IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8228IFE#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 LT8228IFE#TRPBF?
For technical support, including LT8228IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8228IFE#TRPBF requirements.
6.How does Aetrix verify that LT8228IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8228IFE#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 LT8228IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8228IFE#TRPBF?
All LT8228IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8228IFE#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 LT8228IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8228IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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