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Analog Devices Inc. LT8210IFE#PBF
- Part No.:
- LT8210IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8210IFE#PBF.pdf
- Description:
- 100V BUCK/BOOST CTLR WITH PASS-T
- Quantity:
- Payment:
- Shipping:
Inventory:4,233
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Product details
Overview
LT8210IFE#PBF from Analog Devices is a 100V input/output 4-switch synchronous buck-boost DC/DC controller with programmable non-switching pass-thru mode, ±1.25% output voltage accuracy over –40°C to 125°C, 80kHz–400kHz adjustable switching frequency, and reverse input protection down to –40V. It enables high-efficiency power conversion in automotive start-stop and ISO 7637-compliant industrial systems.
For engineers reviewing the LT8210IFE#PBF datasheet, LT8210IFE#PBF pinout, LT8210IFE#PBF application, or LT8210IFE#PBF equivalent, key selection considerations include pass-thru window programming, dual-loop current monitoring (±3% accuracy), GATEVCC back-drive protection during brownout, EXTVCC switchover threshold (7.3–8.8V), and compatibility with standard-level N-channel MOSFETs.
Technical Context
The LT8210IFE#PBF implements independent buck and boost regulation loops with separate FB1 (1.00V typical) and FB2 (1.00V typical) reference inputs, enabling precise output voltage control across all operating regions. Its pass-thru mode activates when VINP is within a user-defined window relative to VOUT, bypassing switching entirely to achieve 99.9% efficiency and zero EMI.
It features dual current sense amplifiers: SNSP1/SNSN1 for cycle-by-cycle inductor current limiting (±20% tolerance) and SNSP2/SNSN2 for average input/output current monitoring and regulation (±3% accuracy). Gate drivers deliver 10V logic-level outputs with 3Ω pull-up and 1Ω pull-down resistance for TG1/TG2, supporting fast switching transitions (25ns rise time).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.8V to 100V (4.5V min for startup); supports wide-input industrial and automotive battery systems. |
| VOUT Range | 1V to 100V; enables flexible output configuration without external level-shifting. |
| Output Voltage Accuracy | ±1.25% over –40°C to 125°C; ensures stable regulation under thermal stress in under-hood environments. |
| Pass-Thru IQ | 18µA at VINP = 48V; minimizes quiescent consumption during non-switching operation. |
| Switching Frequency | 80kHz to 400kHz (RT-set or synchronized); allows EMI optimization and inductor size trade-offs. |
| Current Monitoring Accuracy | ±3% for average current (IMON), ±5% for current regulation; enables reliable overcurrent protection and load management. |
| GATEVCC Regulation | 10.6V ±0.6V at 25mA; powers standard-level N-MOSFETs without external LDO. |
Pinout & Package
LT8210IFE#PBF is housed in a 38-lead plastic TSSOP package with exposed pad (Pin 39) soldered to PCB ground. Pin functions are validated per Analog Devices Rev. B datasheet (pages 3, 12–13).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable & undervoltage lockout input | Precision comparator with 1.45V enable threshold; tolerates –40V to 100V, enabling direct VIN connection or resistor-divider UVLO setup. |
| MODE1/MODE2 (Pins 2–3) | Operating mode selection | Binary-coded inputs selecting CCM, DCM, Burst Mode®, or Pass-Thru; no external logic required. |
| SYNC/SPRD (Pin 4) | Frequency synchronization/spread-spectrum control | Accepts 80–400kHz external clock or enables spread-spectrum modulation when tied to VDD. |
| PWGD (Pin 5) | Power good open-drain output | Asserts low if VOUT deviates >±10% or IMON exceeds 1.20V; compatible with up to 40V pull-up rails. |
| RT (Pin 6) | Switching frequency set resistor | Resistor-to-ground sets fSW from 80–400kHz; internal current source enables precise frequency calibration. |
| GND (Pin 7 / Exposed Pad) | Signal ground reference | Exposed thermal pad must be soldered to PCB ground plane for thermal and noise performance. |
| VDD (Pin 8) | Internally regulated 3.3V supply | Provides bias for MODE/SYNC logic; requires ≥2.2µF ceramic bypass capacitor. |
| SS (Pin 9) | Soft-start timing capacitor | 5µA internal current charges external capacitor to control inrush current ramp rate. |
| IMON (Pin 10) | Average current monitor output | Sources current proportional to (SNSP2 – SNSN2); sets current limit via RIMON to ground. |
| VC1/VC2 (Pins 11–12) | Error amplifier compensation outputs | VC1 controls buck-boost/buck loops; VC2 controls pass-thru buck loop; both drive external compensation networks. |
| FB1/FB2 (Pins 13–14) | Feedback voltage inputs | FB1 = 1.00V ref for CCM/DCM/Burst/boost regulation; FB2 = 1.00V ref for pass-thru buck regulation. |
| VIN/VINP (Pins 17, 21) | Main and precision input voltage sensing | VINP provides accurate input measurement for pass-thru window calculation; VIN handles bulk input connection. |
| SNSP1/SNSN1 (Pins 23–24) | Inductor current sense inputs | Differential pair for cycle-by-cycle peak current limiting; supports bidirectional sensing (±55mV range). |
| TG1/BG1/SW1/BST1 (Pins 25–28) | Top/bottom gate drivers & switch nodes | Drives external N-MOSFETs in buck leg; BST1 supplies floating gate drive for TG1. |
| EXTVCC (Pin 30) | External driver supply input | Enables GATEVCC regulation from VOUT or auxiliary rail; switchover occurs at 7.3–8.8V. |
| GATEVCC (Pin 31) | Regulated 10.6V gate driver supply | Back-drive protected; maintains regulation during VIN brownout when powered from EXTVCC or VINP. |
| PGND (Pin 32) | Power ground return | Separate return path for high-current switching paths; connects to PCB ground near power components. |
| BG2/SW2/BST2/TG2 (Pins 34–37) | Top/bottom gate drivers & switch nodes | Drives external N-MOSFETs in boost leg; BST2 supplies floating gate drive for TG2. |
| DG (Pin 38) | Reverse input protection gate driver | Controls external N-MOSFET for –40V reverse input protection; operates with 7.0–8.5V gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Pass-Thru Window | User-definable VINP range where input passes directly to output-eliminates switching losses and EMI while achieving 99.9% efficiency. |
| Dual Independent Current Sensing | Separate SNSP1/SNSN1 (inductor peak) and SNSP2/SNSN2 (average input/output) paths enable simultaneous overcurrent protection and load current regulation. |
| GATEVCC Back-Drive Protection | Maintains 10.6V gate drive regulation during input brownout by sourcing current from EXTVCC or VINP, ensuring MOSFET gate integrity. |
| Reverse Input Protection to –40V | Integrated DG driver controls external N-MOSFET to disconnect input during negative transients, meeting ISO 16750-2 and MIL-1275 requirements. |
| Spread-Spectrum Frequency Modulation | Reduces EMI peak emissions by modulating switching frequency ±12.5% around RT-set center frequency when SYNC/SPRD tied to VDD. |
| Phase-Lockable Oscillator | Accepts external 80–400kHz clock on SYNC/SPRD pin for system-level timing synchronization and deterministic EMI placement. |
Applications
| Automotive Start-Stop Systems | Industrial Power Supplies |
|---|---|
|
Use Scenario: Maintaining stable 12V/24V bus during engine cranking where battery voltage dips to 3–6V. IC Role / Device Role / Timing Role: Buck-boost controller regulating output despite wide VIN swing; pass-thru mode engages above 10V to minimize loss. Use Value: Enables uninterrupted operation of infotainment and ADAS modules during cold-crank events per ISO 16750-2. |
Use Scenario: Converting unregulated 24–72V DC distribution bus to isolated 5V/12V/24V rails in factory automation PLCs. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC controller with programmable current limits for motor drive auxiliary supplies. Use Value: ±3% current monitoring accuracy supports precise load balancing and fault detection in multi-rail power architectures. |
| Avionics Power Conditioning | Telecom Rectifier Modules |
|
Use Scenario: Surviving DO-160 Section 22 induced transients (±100V spikes) and maintaining output during 100ms input dropouts. IC Role / Device Role / Timing Role: High-reliability buck-boost controller with reverse input protection and GATEVCC back-drive capability. Use Value: –40V to 100V absolute max ratings and 125°C junction temperature rating ensure compliance with airborne equipment standards. |
Use Scenario: Front-end DC/DC stage in 48V telecom rectifiers accepting –72V to –48V nominal input with surge tolerance. IC Role / Device Role / Timing Role: Negative-input capable controller (via DG-driven N-MOSFET) delivering regulated +48V output. Use Value: Reverse input protection and 100V absolute max ratings allow direct integration into legacy –48V infrastructure without external diode stacks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-switch buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780 | Fixed 100V max VIN; no pass-thru mode; lower IQ (25µA in Burst Mode); no reverse input protection. | Lacks non-switching efficiency optimization and –40V reverse protection; suitable only for simpler buck-boost needs without transient immunity. | Select LTC3780 only if pass-thru and reverse protection are unnecessary and cost sensitivity outweighs feature gap. |
| LT8705 | 150V max VIN; no integrated pass-thru logic; requires external comparators for window-based bypass; higher pin count. | Supports wider input but adds design complexity for pass-thru emulation; lacks single-chip reverse protection implementation. | Choose LT8705 only when >100V input is mandatory and system-level pass-thru can be implemented externally. |
Compared with LTC3780 and LT8705, the LT8210IFE#PBF uniquely integrates hardware-based pass-thru mode with automatic transition logic, 100V operation, and monolithic reverse input protection-reducing BOM count and improving transient resilience in automotive and avionics designs.
Availability
LT8210IFE#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial power supplies, and avionics power conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8210IFE#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 aerospace markets.
The LT8210IFE#PBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for robust, wide-input DC/DC conversion in harsh environments including automotive, avionics, and industrial systems with stringent reliability and transient immunity requirements.
FAQ
What is the maximum input voltage rating for the LT8210IFE#PBF?
The LT8210IFE#PBF has an absolute maximum input voltage rating of 100V on VIN and VINP pins, and –40V on the DG pin. Its operational input range is 2.8V to 100V after startup (4.5V minimum for initial start-up), making it suitable for 48V and 72V industrial and automotive battery systems with surge tolerance.
How does the LT8210IFE#PBF implement pass-thru mode and what efficiency benefit does it provide?
The LT8210IFE#PBF implements pass-thru mode by comparing VINP to programmable thresholds derived from FB1 and FB2 references; when VINP falls within the window, internal switches disconnect the power path and route input directly to output. This eliminates switching losses and achieves 99.9% efficiency with only 18µA quiescent current at 48V input.
Can the LT8210IFE#PBF support reverse input protection, and how is it implemented?
Yes, the LT8210IFE#PBF supports reverse input protection down to –40V using its dedicated DG pin, which drives an external N-channel MOSFET placed between the input source and VIN. The DG driver delivers 7.0–8.5V gate voltage and includes undervoltage lockout (2.3–3.0V) to ensure safe turn-off during negative transients.
What are the key differences between the LT8210IFE#PBF and the LTC3780 in terms of functionality?
The LT8210IFE#PBF adds hardware-enforced pass-thru mode, reverse input protection to –40V, GATEVCC back-drive capability during brownout, and ±3% average current monitoring-features absent in the LTC3780. The LTC3780 offers only basic 4-switch buck-boost control with no integrated pass-thru logic or reverse protection circuitry.
Does the LT8210IFE#PBF require external components to set the pass-thru window, and how is it configured?
No external components are required to define the pass-thru window. The LT8210IFE#PBF uses its FB1 and FB2 pins-each with a 1.00V internal reference-to set upper and lower thresholds via resistor dividers from VOUT to ground. The window width and center point are fully programmable through these two independent feedback networks.
LT8210IFE#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:
- 2
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.8V ~ 100V
- Frequency - Switching:
- 80kHz ~ 400kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT8210IFE#PBF FAQ
1.How can I place an order for LT8210IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8210IFE#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 LT8210IFE#PBF reliable?
The price and inventory of LT8210IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8210IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8210IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8210IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8210IFE#PBF?
LT8210IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8210IFE#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 LT8210IFE#PBF?
For technical support, including LT8210IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8210IFE#PBF requirements.
6.How does Aetrix verify that LT8210IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8210IFE#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 LT8210IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8210IFE#PBF?
All LT8210IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8210IFE#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 LT8210IFE#PBF part is unused and in its original packaging.
Return procedure for LT8210IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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