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Analog Devices Inc. LT8210EUJ#PBF
- Part No.:
- LT8210EUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT8210EUJ#PBF.pdf
- Description:
- 100V BUCK/BOOST CTLR WITH PASS-T
- Quantity:
- Payment:
- Shipping:
Inventory:1,656
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Product details
Overview
LT8210EUJ#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 avionics systems where wide VIN/VOUT range and transient survivability are critical.
For engineers reviewing the LT8210EUJ#PBF datasheet, LT8210EUJ#PBF pinout, LT8210EUJ#PBF application, or LT8210EUJ#PBF equivalent, key selection considerations include pass-thru window programming, dual-loop error amplifier compensation (VC1/VC2), GATEVCC back-drive protection during brownout, EXTVCC switchover threshold (7.3–8.8V), and ±3% accurate current monitoring via IMON.
Technical Context
The LT8210EUJ#PBF implements a dual-error-amplifier architecture: VC1 controls the boost loop in pass-thru mode and regulates CCM/DCM/Burst Mode operation; VC2 exclusively governs the buck loop during pass-thru. Its gate drivers deliver 10V logic-level outputs with 3Ω TG pull-up and 1Ω BG pull-down resistance, supporting standard N-channel MOSFETs without level-shifting.
Pass-thru mode activates when VINP falls within a user-defined window set by FB1/FB2 reference voltages (1.000V typ), eliminating switching losses and EMI while maintaining >99.9% efficiency at light load. Transition between buck, boost, and buck-boost regions is seamless and governed by real-time VINP/VOUT ratio comparison against 0.84× and 1.19× thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.8V to 100V (4.5V min for startup); supports ISO 7637 pulse 5a/b, MIL-STD-1275, DO-160 surge compliance. |
| VOUT Range | 1V to 100V; programmable via FB1/FB2 resistive dividers with ±1.25% regulation accuracy across –40°C to 125°C. |
| Switching Frequency | 80kHz to 400kHz (RT-set or synchronized); spread-spectrum modulation reduces EMI peak emissions. |
| Pass-Thru IQ | 18µA typical at VINP = 48V; enables ultra-low-power battery backup and always-on systems. |
| Current Sensing | ±3% average current monitoring accuracy; IMON output sources 5.1–92.7µA proportional to SNSP2–SNSN2 differential voltage. |
| GATEVCC Regulation | 10.6V ±0.6V at 25mA; back-drive protected to sustain regulation during VINP brownout events. |
| Reverse Input Protection | Active down to –40V using external N-MOSFET on DG pin; disconnects input at –1.2V (typ) VIN threshold. |
Pinout & Package
LT8210EUJ#PBF is housed in a 40-lead (6mm × 6mm) plastic QFN package with exposed pad (Pin 41 = GND). The package supports high thermal performance (θJA = 25°C/W) and requires soldering of the exposed pad to PCB ground for optimal power dissipation and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable & Undervoltage Lockout Input | Enables IC above 1.45V; tolerates –40V; sets UVLO threshold via resistor divider from VIN. |
| MODE1/MODE2 (Pins 2,3) | Operating Mode Selection | Configures CCM, DCM, Burst Mode, or Pass-Thru via 2-bit logic; determines control loop behavior and switching state. |
| SYNC/SPRD (Pin 4) | Frequency Synchronization Input | Accepts 80–400kHz external clock; tied to VDD enables spread-spectrum modulation for EMI reduction. |
| PWGD (Pin 5) | Power Good Open-Drain Output | Asserts low if VOUT deviates >±10% or IMON >1.20V; compatible with up to 40V pull-up rails. |
| RT (Pin 6) | Switching Frequency Set | Resistor-to-GND sets fSW: 110kΩ → 91kHz, 39.2kΩ → 190kHz, 16.9kΩ → 380kHz (typ). |
| GND (Pin 7 / Exposed Pad) | Signal & Thermal Ground | Primary reference for small-signal circuitry; exposed pad must be soldered to PCB ground plane. |
| VDD (Pin 8) | Internal 3.3V Regulator Output | Supplies MODE/SYNC logic; bypass with ≥2.2µF ceramic capacitor; UVLO at 2.8V (typ). |
| SS (Pin 9) | Soft-Start Control | Capacitor-to-ground sets inductor current ramp rate; sourced with 5µA internal current during startup. |
| IMON (Pin 10) | Current Monitor Output | Sources current proportional to SNSP2–SNSN2; 1.01V threshold triggers transition to current regulation. |
| VC1/VC2 (Pins 11,12) | Error Amplifier Compensation Outputs | VC1: primary loop comp for CCM/DCM/Burst and pass-thru boost loop; VC2: dedicated buck loop comp in pass-thru. |
| FB1/FB2 (Pins 13,14) | Feedback Inputs | FB1 = 1.000V ref for boost regulation; FB2 = 1.000V ref for buck regulation; define pass-thru window boundaries. |
| VIN (Pin 15) | Main Input Supply | Accepts 2.8–100V; powers internal circuitry; quiescent current as low as 18µA in pass-thru mode. |
| DG (Pin 16) | Dynamic Gate Drive for Reverse Protection | Drives external N-MOSFET for reverse input disconnect; operates at 7–8.5V above VIN. |
| VINP (Pin 17) | Pass-Thru Input Sense | Monitors input for pass-thru window calculation; independent of VIN pin; supports high-side sensing. |
| SNSP1/SNSN1 (Pins 18,19) | Inductor Current Sense Inputs | Measure high-side switch current for cycle-by-cycle limiting; ±20% accuracy; max sense threshold 96mV. |
| TG1/SW1/BST1 (Pins 20–22) | Top Gate Driver, Switch Node, Bootstrap | TG1 drives high-side N-MOSFET gate; SW1 = switch node; BST1 supplies floating gate drive for TG1. |
| EXTVCC (Pin 23) | External Gate Driver Supply Input | Accepts 7.3–40V; switchover from VINP occurs at 8V (typ); improves efficiency vs internal GATEVCC regulation. |
| GATEVCC (Pin 24) | Regulated 10.6V Gate Driver Supply | Internally regulated from VINP or EXTVCC; 110mA max output; dropout <1.6V at 50mA load. |
| BG1/PGND (Pins 25,26) | Bottom Gate Driver & Power Ground | BG1 drives low-side N-MOSFET gate; PGND is high-current return path for power switches and sense resistors. |
| BG2/SW2/BST2 (Pins 27–29) | Second Bottom Gate Driver, Switch Node, Bootstrap | Completes 4-switch topology; BG2 drives second low-side FET; SW2 = second switch node. |
| TG2 (Pin 30) | Second Top Gate Driver | Drives second high-side N-MOSFET; complements TG1 for full 4-switch synchronous buck-boost operation. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Pass-Thru Window | Non-switching conduction enabled when VINP is between FB1- and FB2-defined thresholds; eliminates switching loss and EMI. |
| Dual Independent Error Amplifiers | VC1 and VC2 provide separate compensation networks for buck and boost loops during pass-thru, enabling stable dual-regulation. |
| Reverse Input Protection | Integrated DG driver supports external N-MOSFET to disconnect input down to –40V; prevents damage from battery reversal. |
| Back-Drive Protected GATEVCC | Maintains 10.6V gate drive during VINP brownout by sourcing current from GATEVCC into VINP; sustains MOSFET bias under fault. |
| Spread-Spectrum Modulation | Reduces peak EMI by ±12.5% frequency dithering when SYNC/SPRD tied to VDD; no external components required. |
| High-Accuracy Current Monitoring | IMON output provides ±3% accurate average current measurement referenced to SNSP2/SNSN2; enables precise OCP and foldback. |
Applications
| Automotive Start-Stop Systems | Avionics Power Distribution |
|---|---|
Use Scenario: Maintaining stable 28V supply during engine cranking when battery voltage dips to 4V–6V. IC Role / Device Role / Timing Role: Buck-boost controller regulating 28V output from 4V–36V input; enters pass-thru when input nears 28V. Use Value: Eliminates switching noise during critical communication windows (e.g., eCall activation) while sustaining >99.9% efficiency. |
Use Scenario: Converting 270V DC aircraft bus to 28V/5V rails for flight control computers and sensors. IC Role / Device Role / Timing Role: High-voltage buck-boost controller with MIL-STD-704/DO-160 compliance; handles 100V transients. Use Value: Survives –40V reverse polarity and 100V surges without external TVS; reduces system BOM count and board area. |
| Industrial Telecom Power | Railway Signaling Equipment |
Use Scenario: Providing isolated 48V PoE++ power from fluctuating 36V–72V DC distribution bus. IC Role / Device Role / Timing Role: Primary-side controller managing 4-switch topology; uses EXTVCC for improved light-load efficiency. Use Value: Achieves >95% efficiency at 2A load across full input range; spread-spectrum mode meets EN55032 Class B limits. |
Use Scenario: Powering trackside signaling modules from 72V–110V nominal rail subject to ISO 16750-2 load dump pulses. IC Role / Device Role / Timing Role: Wide-input buck-boost regulator with 100V absolute max rating; withstands 120V transients. Use Value: No external surge clamping needed; integrated reverse protection avoids costly discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#PBF | 6V–100V input; no pass-thru mode; single VC pin; lower max fSW (400kHz vs 400kHz); no reverse input protection. | Lacks non-switching conduction; unsuitable for ultra-low-noise or zero-EMI requirements like eCall. | Select when pass-thru is unnecessary and cost sensitivity outweighs EMI/efficiency benefits. |
| LT8705IUFD#PBF | 4.5V–80V input; no pass-thru; dual VC pins; includes I2C interface; higher quiescent current (25µA vs 18µA in pass-thru). | Requires microcontroller coordination; adds firmware complexity; not drop-in for analog-only designs. | Choose when digital telemetry, telemetry logging, or dynamic parameter adjustment is required. |
Compared with LTC3789EFE#PBF and LT8705IUFD#PBF, the LT8210EUJ#PBF uniquely delivers programmable pass-thru conduction, –40V reverse protection, and back-drive-protected GATEVCC-enabling robust, low-EMI power conversion where input voltage closely tracks output.
Availability
LT8210EUJ#PBF is available at Aetrix Electronics and suitable for automotive start-stop, avionics power distribution, and industrial telecom systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant design assurance.
Supply support for LT8210EUJ#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 precision instrumentation, industrial automation, communications, and aerospace markets.
The LT8210EUJ#PBF belongs to Analog Devices' Power by Linear™ high-voltage DC/DC controller family, designed specifically for demanding automotive, avionics, and industrial applications requiring wide input/output ranges, high reliability, and transient survivability.
FAQ
What is the purpose of the DG pin on the LT8210EUJ#PBF?
The DG pin on the LT8210EUJ#PBF drives an external N-channel MOSFET to enable active reverse input protection down to –40V. When VIN drops below –1.2V (typ), the DG driver turns off the series MOSFET, disconnecting the input and preventing damage. This eliminates the need for external Schottky diodes or complex protection ICs in harsh environments like automotive and railway systems.
How does pass-thru mode function in the LT8210EUJ#PBF?
Pass-thru mode in the LT8210EUJ#PBF activates when VINP falls within a user-programmed window defined by FB1 and FB2 reference voltages (1.000V typ). During this condition, the controller disables switching and directly connects input to output via external MOSFETs, achieving >99.9% efficiency and zero switching noise-critical for EMI-sensitive applications such as emergency call systems.
Can the LT8210EUJ#PBF operate with input voltages below 4.5V?
Yes-the LT8210EUJ#PBF supports VIN as low as 2.8V after startup, but requires ≥4.5V to initiate startup when EXTVCC is unpowered. If EXTVCC is supplied externally (e.g., from VOUT or another rail), the device can start from 2.8V input, enabling operation in low-battery scenarios common in automotive cold-crank conditions.
What is the role of VC1 and VC2 pins on the LT8210EUJ#PBF?
VC1 serves as the error amplifier output and compensation point for CCM/DCM/Burst Mode operation and the boost loop in pass-thru mode. VC2 is dedicated solely to the buck loop compensation during pass-thru. This dual-compensation architecture ensures stable regulation in both buck and boost directions without interaction, essential for seamless transitions across wide VIN/VOUT ratios.
Does the LT8210EUJ#PBF support synchronization to an external clock?
Yes-the LT8210EUJ#PBF supports external clock synchronization via the SYNC/SPRD pin (Pin 4). Applying a clean 80kHz–400kHz clock signal locks the internal oscillator to the external source, enabling deterministic switching timing across multiple converters to reduce beat frequencies and system-level EMI. Tying SYNC/SPRD to VDD instead enables built-in spread-spectrum modulation.
LT8210EUJ#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN 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):
- 4.5V ~ 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:
- 40-QFN (6x6)
LT8210EUJ#PBF FAQ
1.How can I place an order for LT8210EUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8210EUJ#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 LT8210EUJ#PBF reliable?
The price and inventory of LT8210EUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8210EUJ#PBF is usually 5 days.
3.What payment methods are accepted for LT8210EUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8210EUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8210EUJ#PBF?
LT8210EUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8210EUJ#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 LT8210EUJ#PBF?
For technical support, including LT8210EUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8210EUJ#PBF requirements.
6.How does Aetrix verify that LT8210EUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LT8210EUJ#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 LT8210EUJ#PBF meets industry standards.
7.What is the process for return or replacement of LT8210EUJ#PBF?
All LT8210EUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8210EUJ#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 LT8210EUJ#PBF part is unused and in its original packaging.
Return procedure for LT8210EUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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