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Analog Devices Inc. LTC7862EUFD#TRPBF
- Part No.:
- LTC7862EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC7862EUFD#TRPBF.pdf
- Description:
- 140V HIGH EFFICIENCY SWITCHING S
- Quantity:
- Payment:
- Shipping:
Inventory:5,212
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Product details
Overview
LTC7862EUFD#TRPBF 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, clamping VOUT to a user-adjustable level (up to 60V) while delivering up to 20A output current. Used in automotive load dump protection per ISO 7637 and MIL-STD-1275 compliant systems.
For engineers reviewing the LTC7862EUFD#TRPBF datasheet, LTC7862EUFD#TRPBF pinout, LTC7862EUFD#TRPBF application, or LTC7862EUFD#TRPBF equivalent, key selection criteria include adjustable fault timer duration, RSENSE/DCR current sensing flexibility, programmable switching frequency (50–900 kHz), wide 4V–140V input range, and QFN thermal performance with exposed pad grounding.
Technical Context
The LTC7862EUFD#TRPBF implements a peak-current-mode synchronous buck controller architecture with dual N-channel MOSFET gate drivers (TG/BG), integrated charge pump for high-side drive, and fast comparator-based overcurrent protection. Its dropout detection logic enables seamless transition between 100% pass-through and active regulation without output disruption.
It features independent LDOs for DRVCC (6V or 9V selectable via DRVUV) and INTVCC (5V), programmable UVLO/OVLO thresholds, open-drain WARNB fault indicator with 60µs delay, and a precision 0.796V feedback reference (±0.8% over temperature). The TMR pin supports configurable switching time limits and cooldown/retry cycles with 2.7% duty cycle during sustained faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 140V operating; 150V absolute max - supports 28V vehicle bus with 100V load dump transients. |
| VOUT Clamp Range | Adjustable up to 60V via resistor divider on VFB - enables safe clamping at 28V, 34V, or other system-specific levels. |
| Switching Frequency | 50kHz to 900kHz (programmable via FREQ pin resistor) - allows optimization of size vs. EMI in surge protection designs. |
| Current Sensing | RSENSE or inductor DCR sensing - provides design flexibility for accuracy, cost, and board space trade-offs. |
| Fault Timer Resolution | 55ms/µF (initial fault), 50ms/µF (retry), 1700ms/µF (cooldown) - enables precise thermal management during transient events. |
| Package Thermal Resistance | θJA = 43°C/W, θJC = 3.4°C/W (QFN UFD) - requires exposed pad soldering to PCB ground for rated thermal performance. |
| Operating Temperature | –40°C to +125°C junction - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
20-pin (4mm × 5mm) plastic QFN package (UFD) with exposed thermal pad (Pin 21) that must be soldered to PCB ground for electrical integrity and thermal performance (θJC = 3.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+ | Differential current sense positive input | Connects to high-side of current sense resistor; sets overcurrent trip point with SENSE– and ITH voltage. |
| SENSE– | Differential current sense negative input | Biased above INTVCC during operation; powers internal current comparator when >5V. |
| SS | Soft-start ramp control | Internal 10µA pull-up charges external capacitor to control startup slew rate and inrush limiting. |
| VFB | Feedback voltage input | Compares against 0.796V reference; sets regulated output clamp voltage via external resistor divider. |
| ITH | Error amplifier output / compensation node | Sets current limit threshold and provides loop compensation for stability in buck regulation mode. |
| TMR | Fault timer timing input | External capacitor sets maximum switching duration, retry interval, and cooldown period. |
| FREQ | Oscillator frequency control | Resistor-to-GND selects frequency from 50–900kHz; tied to GND or INTVCC for fixed 350/535kHz. |
| WARNB | Open-drain fault warning output | Pulls low during switching (surge, overcurrent, startup) and cooldown; high-Z after dropout entry (60µs delay). |
| TG | Top N-MOSFET gate driver output | Floating high-side driver (SW to BOOST swing); drives MTOP with <25ns rise/fall times. |
| SW | Switch node connection | Connects to inductor and bottom MOSFET source; critical for layout to minimize EMI and ringing. |
| BOOST | Bootstrap supply for TG driver | Capacitor between BOOST and SW sustains high-side drive; diode from BOOST to DRVCC supplies charge pump. |
| BG | Bottom N-MOSFET gate driver output | Ground-referenced driver (0V to DRVCC); synchronously controls MBOT with 50ns dead-time control. |
| GND | Power and signal ground | All GND pins plus exposed pad (Pin 21) must be connected to common PCB ground plane. |
| DRVCC | Gate driver supply output | 5.8–9.4V LDO output (selectable 6V/9V); powers TG/BG drivers; requires ≥4.7µF ceramic decoupling. |
| VIN | Main input supply | Primary power input (4–140V); bypassed with bulk and ceramic capacitors near pin. |
| EXTVCC | External gate driver supply input | Optional 7–13V input to bypass VIN-based DRVCC LDO; switchover at 4.7V or 7.7V depending on DRVUV. |
| RUN | Enable/disable control | Logic-high (>1.12V) enables operation; <0.7V forces full shutdown (10µA IQ). |
| DRVUV | DRVCC regulation and UVLO select | Tie to GND for 6V DRVCC/low-threshold UVLO; tie to INTVCC for 9V DRVCC/high-threshold UVLO. |
| INTVCC | Internal 5V analog/digital supply | Stable 5V LDO output; powers internal circuitry; requires 0.1µF ceramic capacitor close to pin. |
| OVLO | Overvoltage lockout input | Disable switching when >1.2V applied; soft-start resets on OVLO assertion; tie to GND if unused. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle pass-through mode | Enables near-zero insertion loss during normal operation - critical for minimizing conduction losses in high-current vehicle power systems. |
| Programmable fault timer with cooldown | Prevents thermal runaway by limiting cumulative switching time during surges - allows component sizing optimized for pass-through, not worst-case regulation. |
| Adjustable output voltage clamp | Supports system-specific clamping (e.g., 28V, 34V, 48V) without redesign - eliminates need for external regulators in protected subsystems. |
| Synchronous N-MOSFET gate drivers | Integrated TG/BG drivers with <30ns transitions reduce external component count and improve efficiency vs. discrete driver solutions. |
| RSENSE or DCR current sensing | Flexibility to choose between high-accuracy shunt resistors or low-cost inductor DCR sensing - accommodates cost, accuracy, and thermal constraints. |
| Open-drain WARNB with timing delay | Provides unambiguous fault indication synchronized to controller state - avoids false triggers during mode transitions or startup. |
Applications
| Automotive Load Dump Protection | ISO 7637-2 Compliant Power Supply |
|---|---|
Use Scenario: Protecting infotainment ECUs and ADAS sensors from 100V/400ms load dump transients on 12V/24V vehicle buses. IC Role / Device Role / Timing Role: Acts as pre-regulator clamping VOUT to 28V during surge; remains in 100% pass-through during normal operation. Use Value: Enables use of standard 36V-rated downstream components instead of 150V-rated parts - reducing BOM cost and footprint. | Use Scenario: Providing stable 28V rail to telematics modules subjected to pulse 5a/b per ISO 7637-2. IC Role / Device Role / Timing Role: Regulates output during transient pulses while maintaining continuous operation - no system reset or brownout. Use Value: Eliminates need for oversized input capacitors or linear post-regulators - improves system efficiency and thermal margin. |
| MIL-STD-1275 Vehicle Power Interface | Industrial 48V DC Power Distribution |
Use Scenario: Securing avionics and mission-critical controllers against 100V/500ms surges in military ground vehicles. IC Role / Device Role / Timing Role: Switches into buck mode only during overvoltage events; otherwise passes input directly with <100mV drop at 20A. Use Value: Achieves >95% efficiency in pass-through mode and >88% during regulation - extends battery runtime and reduces heatsink requirements. | Use Scenario: Protecting PLC I/O modules and motor drives from 100V surges on factory 48V DC backbone. IC Role / Device Role / Timing Role: Clamps output to 52V using VFB divider; uses DCR sensing to avoid shunt resistor power loss. Use Value: Supports high-current (20A+) distribution without derating - maintains reliability across wide ambient temperature range (–40°C to +125°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365HDE#PBF | Linear surge stopper; 40V max VIN; no switching; 3.3V/5V fixed outputs | Lower power capability (<3A), no adjustable clamp, simpler layout but higher power loss during surges | Select for low-complexity, low-current (<3A), space-constrained designs where efficiency during surge is secondary. |
| MAX6495ATA+T | Switching surge protector; 80V max VIN; integrated MOSFETs; 5V/3.3V fixed outputs | Lower voltage rating, monolithic (no external FETs), limited to 3A output, no adjustable VOUT clamp | Select for compact, lower-power applications requiring integrated solution and fixed output voltages. |
Compared with LTC4365HDE#PBF and MAX6495ATA+T, the LTC7862EUFD#TRPBF delivers scalable high-current protection (20A+) with fully adjustable clamp voltage and external FET flexibility - making it suitable for demanding automotive, military, and industrial systems where thermal management and design reuse are critical.
Availability
LTC7862EUFD#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, ISO 7637-2 compliant power supplies, and MIL-STD-1275 vehicle interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC7862EUFD#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, 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#TRPBF belongs to Analog Devices' Power by Linear™ surge protection controller family, engineered specifically for high-reliability DC power conditioning in harsh electromagnetic and thermal environments.
FAQ
What is the maximum input voltage the LTC7862EUFD#TRPBF can withstand?
The LTC7862EUFD#TRPBF has an absolute maximum input voltage rating of 150V, with a specified operating range of 4V to 140V. It is designed to handle 100V load dump transients per ISO 7637 and MIL-STD-1275 standards. Exceeding 150V may cause permanent damage, and operation above 140V is outside guaranteed specifications. Always observe layout best practices for high-voltage transient immunity.
How does the LTC7862EUFD#TRPBF switch between pass-through and regulation modes?
The LTC7862EUFD#TRPBF automatically enters 100% duty-cycle pass-through mode when input voltage is below the programmed VOUT clamp level, turning on the top MOSFET continuously. When VIN exceeds the clamp voltage (e.g., during a surge), it immediately initiates synchronous buck regulation using TG and BG drivers to maintain constant VOUT. Dropout detection ensures seamless, glitch-free transitions without output interruption.
Can the LTC7862EUFD#TRPBF be used with DCR current sensing?
Yes, the LTC7862EUFD#TRPBF supports both RSENSE shunt and inductor DCR current sensing. For DCR sensing, connect the SENSE+ and SENSE– pins across a small RC network (RC filter) placed in series with the inductor's DCR. This method eliminates shunt resistor power loss and improves thermal efficiency - especially valuable in high-current automotive applications where board space and heat dissipation are constrained.
What is the purpose of the TMR pin on the LTC7862EUFD#TRPBF?
The TMR pin on the LTC7862EUFD#TRPBF sets three critical timing functions via a single external capacitor: (1) maximum allowed switching duration during overvoltage/overcurrent events, (2) retry interval after fault clearance, and (3) cooldown period before restart. This prevents thermal overload by limiting cumulative switching time - enabling smaller external components optimized for pass-through operation rather than continuous regulation.
Does the LTC7862EUFD#TRPBF require special PCB layout considerations?
Yes, the LTC7862EUFD#TRPBF requires careful PCB layout: the exposed thermal pad (Pin 21) must be soldered to a solid GND plane for thermal and electrical performance; high-current paths (TG, BG, SW, BOOST) demand short, wide traces; VIN and VOUT capacitors must be placed adjacent to their respective pins; and the SENSE+/- traces should be routed as a matched differential pair away from noisy nodes to ensure accurate current sensing.
LTC7862EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 20-WFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC7862EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7862EUFD#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 LTC7862EUFD#TRPBF reliable?
The price and inventory of LTC7862EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7862EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7862EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7862EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7862EUFD#TRPBF?
LTC7862EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7862EUFD#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 LTC7862EUFD#TRPBF?
For technical support, including LTC7862EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7862EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC7862EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7862EUFD#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 LTC7862EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7862EUFD#TRPBF?
All LTC7862EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7862EUFD#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 LTC7862EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7862EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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