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Analog Devices Inc. LTC7862EUFD#PBF
- Part No.:
- LTC7862EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC7862EUFD#PBF.pdf
- Description:
- 140V HIGH EFFICIENCY SWITCHING S
- Quantity:
- Payment:
- Shipping:
Inventory:197
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Product details
Overview
LTC7862EUFD#PBF from Analog Devices is a high-efficiency switching surge stopper controller designed to protect downstream loads from input overvoltage transients up to 140V. It operates in 100% duty-cycle pass-through mode during normal conditions and switches into buck regulation during surges, overcurrents, or startup-clamping VOUT to a user-adjustable level up to 60V while delivering up to 20A output current. Used in automotive load dump (ISO 7637), MIL-STD-1275, and industrial power systems.
For engineers reviewing the LTC7862EUFD#PBF datasheet, LTC7862EUFD#PBF pinout, LTC7862EUFD#PBF application, or LTC7862EUFD#PBF equivalent, key selection criteria include its 4V–140V input range, adjustable fault timer, RSENSE/DCR current sensing, open-drain WARNB fault indicator, and dual-package support (QFN/TSSOP) with exposed thermal pad.
Technical Context
The LTC7862EUFD#PBF implements a peak-current-mode synchronous buck controller architecture with fast comparator-based overcurrent protection and programmable switching frequency (50kHz–900kHz). Its gate drivers deliver <25ns rise/fall times and support external N-channel MOSFETs with top-side driver supply via integrated charge pump (BOOST-SW).
It features dual LDOs: INTVCC (5.0V ±3%) for internal analog/digital circuits and DRVCC (6.0V or 9.0V selectable via DRVUV) for gate drivers. The TMR pin enables precise control of switching duration during faults, enforcing a 2.7% retry duty cycle and cool-down period to limit thermal stress during sustained overvoltage events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports wide-range vehicle and military bus operation including ISO 7637 load dump and MIL-STD-1275 transients. |
| Output Clamp Voltage | Adjustable up to 60V - set via external resistor divider on VFB; typical 28V/34V clamping used in 28V system protection. |
| Switching Frequency | 50kHz to 900kHz - programmable via FREQ pin resistor; fixed options at 350kHz (low) or 535kHz (high) when tied to GND or INTVCC. |
| Current Sensing | RSENSE or inductor DCR - differential SENSE+/SENSE− inputs with 43mV–57mV max threshold; enables accurate overcurrent protection independent of MOSFET RDS(on). |
| Fault Timer Control | Programmable via CTMR capacitor - sets initial switching time (55ms/µF), retry interval (50ms/µF), and cool-down (1700ms/µF) to manage thermal budget. |
| Gate Driver Outputs | TG and BG drivers - 2.2Ω pull-up / 1.0Ω pull-down on TG; 2.0Ω/1.0Ω on BG; supports high-side N-MOS with BOOST charge pump. |
| Operating Temperature | –40°C to +125°C - specified junction temperature range for industrial and automotive under-hood applications. |
Pinout & Package
Package: 20-lead (4mm × 5mm) plastic QFN with exposed thermal pad (Pin 21 = GND). Requires soldering of exposed pad to PCB ground plane for rated electrical performance and θJA = 43°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+ | Differential current sense positive input | Connects to high-side of current sense resistor; used with SENSE− to set overcurrent trip point based on ITH voltage. |
| SENSE− | Differential current sense negative input | Connects to low-side of sense resistor or inductor DCR; supplies comparator bias when >INTVCC. |
| SS | Soft-start ramp control | Internal 10µA pull-up charges external capacitor; regulates VFB to min(0.8V, VSS) during startup to limit inrush. |
| VFB | Feedback voltage input | Monitors output via resistor divider; regulated to 0.792V–0.812V (typ 0.800V); determines output clamp voltage. |
| ITH | Error amplifier output & compensation node | Sets current limit threshold; higher voltage increases current trip point linearly per datasheet curve. |
| TMR | Fault timer timing input | Capacitor-to-ground sets switching duration, retry delay, and cool-down time; internal current sources define thresholds. |
| FREQ | Oscillator frequency control | 20µA internal pull-up sets VCO voltage; resistor to GND programs frequency; tie to GND/INTVCC for fixed 350/535kHz. |
| WARNB | Open-drain fault warning output | Pulls low during switching (surge, overcurrent, startup) and cool-down; high-impedance in dropout/pass-through mode. |
| TG | Top-gate driver output | Floating high-side driver (SW to BOOST swing); drives gate of external high-side N-MOSFET. |
| SW | Switch node connection | Connects to inductor and source of bottom MOSFET; node voltage swings from GND to VIN during operation. |
| OVLO | Overvoltage lockout input | Logic-high (>1.2V) disables switching; maintains DRVCC/INTVCC regulation; connect to GND if unused. |
| INTVCC | Internal 5V LDO output | Supplies internal analog/digital circuitry; requires 0.1µF ceramic bypass close to pin. |
| DRVCC | Gate driver supply output | 6.0V (DRVUV=GND) or 9.0V (DRVUV=INTVCC); powers TG/BG drivers; requires ≥4.7µF low-ESR ceramic decoupling. |
| VIN | Main input supply | Primary power input (4V–140V); bypass capacitor required between VIN and GND. |
| EXTVCC | External gate driver supply input | Alternative input for DRVCC LDO; switchover at 4.7V (DRVUV=GND) or 7.7V (DRVUV=INTVCC); max 14V rating. |
| RUN | Enable/disable control | 1.12V threshold for shutdown; <0.7V forces full shutdown (IQ ≈10µA); must not be left floating. |
| DRVUV | DRVCC UVLO & EXTVCC switchover select | Selects DRVCC voltage (6V/9V) and corresponding UVLO/switchover thresholds; tie to GND or INTVCC. |
| BOOST | Bootstrap supply for top-gate driver | Connected via capacitor to SW; diode from DRVCC provides charge; voltage ~DRVCC above SW during operation. |
| BG | Bottom-gate driver output | Drives gate of synchronous N-MOSFET; swing from GND to DRVCC; complements TG in buck operation. |
| GND | Ground reference | All GND pins (including exposed pad Pin 21) must be connected to common PCB ground for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle pass-through mode | Minimizes conduction loss during normal operation-insertion loss dominated by external MOSFET RDS(on), not IC quiescent drop. |
| Adjustable output voltage clamp | Set via standard resistor divider on VFB; supports precise clamping from ~2V to 60V without external op-amps. |
| Programmable fault timer with cooldown | Prevents thermal runaway during sustained surges by limiting total switching time and enforcing mandatory cool-down before retry. |
| Open-drain WARNB fault indicator | Provides system-level status signaling-low during all fault conditions (overvoltage, overcurrent, startup, cool-down) and high-Z in safe pass-through. |
| Dual current sensing methods | Supports either discrete shunt (RSENSE) or lossless inductor DCR sensing-reduces BOM count and improves efficiency in high-current designs. |
| Robust gate drivers with charge pump | TG/BG drivers deliver fast edge rates (<25ns) and low on-resistance; integrated BOOST charge pump eliminates need for external bootstrap components. |
Applications
| Automotive Load Dump Protection | MIL-STD-1275 Vehicle Power |
|---|---|
|
Use Scenario: Protecting infotainment, ADAS, or telematics modules from 100V/400ms load dump transients on 28V vehicle buses. IC Role / Device Role / Timing Role: Acts as pre-regulator that clamps VOUT to 34V during surge while maintaining continuous power to downstream DC/DC converters. Use Value: Enables use of cost-effective 36V-rated downstream components instead of 100V+ rated parts; reduces system thermal stress vs linear solutions. |
Use Scenario: Ensuring uninterrupted operation of avionics or mission-critical electronics during MIL-STD-1275 Class A/B/C transients (up to 100V). IC Role / Device Role / Timing Role: Switching surge stopper operating in dropout mode >99% of time; activates only during transient events to regulate output. Use Value: Delivers 20A output current during 100V surges-unachievable with linear surge protectors due to excessive power dissipation. |
| Industrial Power Input Conditioning | High-Reliability DC Power Distribution |
|
Use Scenario: Stabilizing unregulated 48V–72V industrial bus inputs subject to lightning-induced surges or switching transients. IC Role / Device Role / Timing Role: Controls external N-MOSFET pair to implement efficient buck regulation only when input exceeds safe clamp threshold. Use Value: Achieves >95% efficiency in regulation mode-cutting power loss by >70% versus linear alternatives at 10A output. |
Use Scenario: Providing fault-tolerant power path in redundant power systems where continuous availability is critical. IC Role / Device Role / Timing Role: Monitors input continuously; asserts WARNB during any fault event to trigger system-level diagnostics or failover logic. Use Value: Integrates programmable timer and retry behavior-eliminates need for external microcontroller supervision in safety-critical designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365HDE#PBF | Linear surge protector (no switching); 4–40V input; fixed 3.3V/5V/12V outputs; no adjustable clamp or timer. | Lower current capability (max 2.5A); suited for low-power logic rails-not for high-current 28V bus protection. | Choose LTC4365HDE#PBF only for sub-3A applications where simplicity and ultra-low quiescent current (<15µA) outweigh efficiency needs. |
| TPS43060RTER | Wide-input synchronous buck controller (4.5–60V); no integrated surge-specific features like programmable fault timer or WARNB. | Lacks dedicated overvoltage lockout, adjustable clamp, or pass-through mode-requires external circuitry to emulate surge stopper behavior. | Choose TPS43060RTER only when designing custom surge protection with full control over timing, sequencing, and fault response. |
Compared with LTC4365HDE#PBF and TPS43060RTER, the LTC7862EUFD#PBF uniquely combines high-efficiency switching regulation, 140V input tolerance, adjustable output clamping, and integrated fault management-making it the only single-chip solution for 20A+ automotive/military surge protection without external supervision.
Availability
LTC7862EUFD#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, MIL-STD-1275 compliance testing, and industrial 48V power distribution requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LTC7862EUFD#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7862EUFD#PBF belongs to Analog Devices' Power by Linear™ surge protection controller family, engineered specifically for high-reliability DC power conditioning in harsh environments where input transients exceed standard regulator limits.
FAQ
What is the maximum input voltage the LTC7862EUFD#PBF can withstand?
The LTC7862EUFD#PBF has an absolute maximum input voltage rating of 150V, with guaranteed operation across a 4V to 140V input range. This makes it suitable for protecting against severe transients such as ISO 7637 load dump (100V/400ms) and MIL-STD-1275 Class C surges (100V/500ms), while maintaining regulation and reliability within its specified operating range.
How does the LTC7862EUFD#PBF handle overcurrent conditions?
The LTC7862EUFD#PBF detects overcurrent using differential sensing at SENSE+ and SENSE− pins, with a programmable trip threshold determined by the ITH voltage and sense resistor value. When triggered, it enters switching mode to regulate output current, and the fault timer (TMR pin) limits total switching duration to prevent thermal overload-enforcing automatic cool-down and retry cycles.
Can the LTC7862EUFD#PBF operate without external MOSFETs?
No-the LTC7862EUFD#PBF is a controller-only device and requires two external N-channel MOSFETs: one high-side (driven by TG) and one synchronous low-side (driven by BG). It does not integrate power switches; its design relies on external FETs selected for voltage rating, RDS(on), and thermal performance to match application requirements.
What is the purpose of the WARNB pin on the LTC7862EUFD#PBF?
The WARNB pin on the LTC7862EUFD#PBF is an open-drain logic output that pulls low during all active fault conditions-including input overvoltage, overcurrent, startup, and cool-down periods. It transitions to high-impedance only during normal 100% duty-cycle pass-through operation, providing a simple, real-time system-level indicator of surge stopper activity.
Is the LTC7862EUFD#PBF pin-compatible with other variants in the LTC7862 family?
Yes-the LTC7862EUFD#PBF shares identical pinout and footprint with all other LTC7862 variants in the 20-lead QFN (UFD) package, including LTC7862IUFD#PBF and LTC7862HUFD#PBF. Differences are limited to temperature grade (E = –40°C to +125°C) and minor electrical specifications-not pin function or layout.
LTC7862EUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 20-WFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x5)
LTC7862EUFD#PBF FAQ
1.How can I place an order for LTC7862EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7862EUFD#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 LTC7862EUFD#PBF reliable?
The price and inventory of LTC7862EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7862EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7862EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7862EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7862EUFD#PBF?
LTC7862EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7862EUFD#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 LTC7862EUFD#PBF?
For technical support, including LTC7862EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7862EUFD#PBF requirements.
6.How does Aetrix verify that LTC7862EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7862EUFD#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 LTC7862EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7862EUFD#PBF?
All LTC7862EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7862EUFD#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 LTC7862EUFD#PBF part is unused and in its original packaging.
Return procedure for LTC7862EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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