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Analog Devices Inc. LT8228EFE#PBF
- Part No.:
- LT8228EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8228EFE#PBF.pdf
- Description:
- SWITCHING VOLTAGE REGULATORS 100
- Quantity:
- Payment:
- Shipping:
Inventory:149
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Product details
Overview
LT8228EFE#PBF 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 detection via FAULT/REPORT pins. It operates across 6V–100V input/output ranges, delivers ±1.0% feedback voltage tolerance over temperature, and enables programmable switching frequency from 80kHz to 600kHz - deployed in dual-battery automotive backup systems requiring high-reliability power path control.
For engineers reviewing the LT8228EFE#PBF datasheet, LT8228EFE#PBF pinout, LT8228EFE#PBF application, or LT8228EFE#PBF equivalent, key selection criteria include bidirectional current limit accuracy (±2.5%), masterless current sharing error (±4%), 10V gate drive capability, AEC-Q100 qualification for automotive use, and integrated protection MOSFET controllers for V1/V2 terminals with –40V negative voltage tolerance.
Technical Context
The LT8228EFE#PBF implements dual-loop control architecture 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 (buck at 2V, boost at 0V), while internal protection MOSFET drivers (DG1/DG2) provide 8–12.5V gate drive relative to DS1/DS2, enabling reverse current blocking and inrush limiting with adjustable timer-based short-circuit protection on the boost output.
It supports parallel operation via ISHARE pin with masterless, fault-tolerant current sharing, and integrates diagnostic features including switching MOSFET short detection, UV/OV monitoring on both V1/V2 rails, and real-time current monitoring through IMON1/IMON2 outputs. The device uses a PLL-based oscillator synchronized via SYNC pin and offers spread-spectrum modulation for EMI reduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input/Output Voltage Range | 6V to 100V - supports wide-range battery and industrial bus applications without external level-shifting. |
| Feedback Voltage Accuracy | ±1.0% over temperature - ensures stable regulation under thermal stress in automotive and industrial environments. |
| Switching Frequency Range | 80kHz to 600kHz - programmable via RT resistor or external SYNC clock for optimal efficiency/EMI trade-off. |
| Bidirectional Current Regulation Error | ±2.5% - tight current loop accuracy for precision battery charging/discharging and power path management. |
| Current Sharing Error (Parallel) | ±4% - enables scalable high-current designs with multiple LT8228EFE#PBF controllers without master clock or complex calibration. |
| Negative Voltage Protection | –40V on DS1/DS2 - prevents damage during reverse battery insertion or load dump events in dual-rail systems. |
| Gate Drive Capability | 10V swing (DG1/DG2 relative to DS1/DS2) - drives high-side NMOS protection FETs directly without external level shifters. |
Pinout & Package
The LT8228EFE#PBF is housed in a 38-lead plastic TSSOP package (FE) with exposed pad (Pin 39) soldered to PCB for thermal management. Pin functions are validated per Analog Devices Rev. C datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SNS1P/SNS1N | V1 current sense differential inputs | Measure bidirectional current at V1 terminal; support ±80mV sensing range with <±2.5% regulation error. |
| SNS2P/SNS2N | V2 current sense differential inputs | Measure bidirectional current at V2 terminal; enable independent current monitoring and regulation in buck/boost modes. |
| DG1/DS1 | V1 protection MOSFET gate driver and source | Control external NMOS at V1 to block reverse current in buck mode and limit inrush in boost mode. |
| DG2/DS2 | V2 protection MOSFET gate driver and source | Control external NMOS at V2 for negative voltage protection and fault isolation up to –40V. |
| DRXN | Direction control input | Logic-high (≥2V) selects buck mode; logic-low (≤0.85V) selects boost mode - auto-determined or externally forced. |
| FAULT/REPORT | Fault reporting outputs | Open-drain FAULT asserts low on critical faults; REPORT provides analog voltage proportional to shared current or fault status. |
| ISHARE | Current sharing bus | Analog node for masterless paralleling - voltage represents average current across multiple LT8228EFE#PBF units. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current regulation | Independent ISET1P/ISET1N/ISET2P/ISET2N pins enable precise ±2.5% current control in both directions without mode-switching recalibration. |
| Reverse current blocking | DG1-driven V1 protection MOSFET blocks reverse current during buck operation, eliminating need for external diodes or ideal diode controllers. |
| Boost output short protection | Adjustable timer circuit breaker on TMR pin limits boost output short-circuit duration, preventing thermal runaway without sacrificing startup reliability. |
| AEC-Q100 qualified | LT8228EFE#PBF grade E (–40°C to 125°C) meets automotive reliability standards for dual-battery systems and power interrupt protection. |
| Programmable spread spectrum | Reduces peak EMI by modulating switching frequency around fPROG setting - improves EMC compliance in noise-sensitive vehicle electronics. |
Applications
| Automotive Dual-Battery Systems | High-Reliability Backup Power |
|---|---|
Use Scenario: Seamless power handoff between starter battery (12V) and auxiliary Li-ion battery (48V) during engine start-stop cycles and load dumps. IC Role / Device Role / Timing Role: Bidirectional buck/boost controller regulating voltage and current flow between two isolated battery domains with reverse polarity protection. Use Value: Prevents reverse current damage during hot-swap events and maintains system uptime during primary supply interruption with <150ns minimum on-time control. | Use Scenario: Industrial PLC or telecom base station using supercapacitor bank as backup source during AC mains failure. IC Role / Device Role / Timing Role: Constant-current charger and discharge regulator managing energy transfer between main rail and backup storage with fault-isolated power paths. Use Value: Enables "N+1" redundant power architecture with masterless current sharing across parallel controllers, reducing single-point-of-failure risk. |
| Power Interrupt Protection System | Redundant Server Power Supply |
Use Scenario: Datacenter server rack with dual 48V DC inputs where one supply may fail unexpectedly during operation. IC Role / Device Role / Timing Role: Bidirectional controller enforcing strict current limits and detecting MOSFET shorts to isolate faulty rails within microseconds. Use Value: Fault reporting via FAULT/REPORT pins enables real-time diagnostics and automated switchover, meeting <10ms continuity requirements for Tier-4 uptime. | Use Scenario: Enterprise storage array requiring uninterrupted power delivery during hot-swap of failed PSU modules. IC Role / Device Role / Timing Role: Synchronous buck/boost controller managing bidirectional energy flow between redundant PSUs and intermediate bus capacitor. Use Value: Supports seamless transition between supply sources with no output voltage droop or reverse current injection, verified at 40A buck and 10A boost loads. |
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 |
|---|---|---|---|
| LTC7821EFE#PBF | Fixed-ratio hybrid converter (no regulation); no bidirectional current control; no V1/V2 protection MOSFET drivers. | Used only in non-regulated high-efficiency step-down applications; lacks reverse current blocking and fault reporting. | Select only when precise voltage/current regulation and protection are unnecessary - not suitable for battery backup or automotive use. |
| MPQ4269GJ-AEC1-Z | Single-direction 65V buck-boost controller; no reverse current blocking; no ISHARE current sharing; no AEC-Q100 qualification. | Targeted at consumer portable devices; lacks negative voltage tolerance and diagnostic reporting required for automotive or industrial deployment. | Consider only for cost-sensitive, non-automotive applications with unidirectional power flow and relaxed reliability requirements. |
Compared with LTC7821EFE#PBF and MPQ4269GJ-AEC1-Z, the LT8228EFE#PBF uniquely combines bidirectional regulation, integrated protection MOSFET control, AEC-Q100 qualification, and masterless current sharing - making it the sole option for automotive dual-battery systems requiring reverse current blocking and fault-isolated redundancy.
Availability
LT8228EFE#PBF is available at Aetrix Electronics and suitable for automotive dual-battery systems, industrial backup power supplies, and telecom power interrupt protection requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8228EFE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8228EFE#PBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, designed specifically for robust bidirectional power management in safety-critical automotive and industrial backup systems.
FAQ
What is the operating temperature range for the LT8228EFE#PBF?
The LT8228EFE#PBF is rated for operation from –40°C to +125°C junction temperature and is qualified to AEC-Q100 Grade E standards. This makes the LT8228EFE#PBF suitable for under-hood automotive applications and industrial environments with wide ambient thermal swings. Thermal shutdown activates at 150°C to protect the device during overload conditions.
How does the LT8228EFE#PBF handle reverse battery insertion at the V2 terminal?
The LT8228EFE#PBF detects negative voltage at DS2 down to –40V and disables DG2 gate drive to isolate the V2 terminal using the external protection MOSFET. During reverse battery insertion in regulation, the LT8228EFE#PBF maintains controlled shutdown without latch-up, verified in typical performance graphs (Figure G14/G15). This behavior is intrinsic to the V2 protection MOSFET controller and requires no external circuitry.
Can the LT8228EFE#PBF operate in both buck and boost modes simultaneously?
No - the LT8228EFE#PBF operates exclusively in either buck or boost mode at any given time, determined by the DRXN pin state (≥2V = buck, ≤0.85V = boost). However, it supports seamless transitions between modes during system reconfiguration, and its bidirectional current sensing allows continuous monitoring regardless of direction. The LT8228EFE#PBF does not support concurrent buck-and-boost operation on the same power path.
What is the purpose of the ISHARE pin on the LT8228EFE#PBF?
The ISHARE pin on the LT8228EFE#PBF enables masterless, fault-tolerant current sharing among multiple parallel controllers. It carries an analog voltage representing the average current across all connected LT8228EFE#PBF units, allowing each device to adjust its output to match the group average with ±4% sharing error. No clock synchronization or daisy-chaining is required - simply tie all ISHARE pins together with appropriate pull-up.
Does the LT8228EFE#PBF require external Schottky diodes in typical applications?
External Schottky diodes (e.g., D2/D3 in typical application schematics) are optional and used only to improve light-load efficiency or reduce body-diode conduction losses in boost mode. The LT8228EFE#PBF does not require them for basic operation - its synchronous rectification and strong gate drivers (100mA sink/source) fully support NMOS-only designs. Diode selection guidance is provided in the datasheet Section "Optional Schottky Diode Selection" (p.45).
LT8228EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (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:
- 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#PBF FAQ
1.How can I place an order for LT8228EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8228EFE#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 LT8228EFE#PBF reliable?
The price and inventory of LT8228EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8228EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8228EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8228EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8228EFE#PBF?
LT8228EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8228EFE#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 LT8228EFE#PBF?
For technical support, including LT8228EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8228EFE#PBF requirements.
6.How does Aetrix verify that LT8228EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8228EFE#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 LT8228EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8228EFE#PBF?
All LT8228EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8228EFE#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 LT8228EFE#PBF part is unused and in its original packaging.
Return procedure for LT8228EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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