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Analog Devices Inc. LTC7862IFE#TRPBF
- Part No.:
- LTC7862IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7862IFE#TRPBF.pdf
- Description:
- 140V HIGH EFFICIENCY SWITCHING S
- Quantity:
- Payment:
- Shipping:
Inventory:4,665
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Product details
Overview
LTC7862IFE#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 (ISO 7637) and military power (MIL-STD-1275) protection circuits.
For engineers reviewing the LTC7862IFE#TRPBF datasheet, LTC7862IFE#TRPBF pinout, LTC7862IFE#TRPBF application, or LTC7862IFE#TRPBF equivalent, key selection considerations 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 –40°C to 125°C operation.
Technical Context
The LTC7862IFE#TRPBF implements a synchronous N-channel MOSFET gate driver architecture with independent TG and BG outputs, supporting external high-side and low-side FETs. Its peak-current-mode control loop uses an adjustable ITH voltage to set current limit threshold and integrates a fast comparator for overcurrent response within nanoseconds.
It features dual DRVCC supply paths - from VIN via internal LDO or from EXTVCC - with switchover thresholds programmable via DRVUV pin (6V or 9V output). The TMR pin controls both switching duration during faults and cooldown/retry timing using a single external capacitor, enabling thermal optimization for transient-only operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 140V operating; 150V absolute max - supports wide industrial/military input rails including ISO7637 load dump and MIL-STD-1275 surges. |
| VOUT Clamp Range | Adjustable up to 60V via feedback divider - enables precise output voltage limiting during transients without external regulators. |
| Switching Frequency | 50kHz to 900kHz programmable - allows EMI optimization and inductor size trade-offs across diverse surge durations and power levels. |
| Current Sensing | RSENSE or inductor DCR sensing - provides flexibility in accuracy vs. cost vs. board space for overcurrent protection. |
| Fault Timer | Programmable via TMR pin capacitor - sets maximum switching time per fault event and cooldown period, enabling thermal design for pass-through dominance. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and harsh-environment industrial applications. |
| Package | 20-pin 4mm × 5mm QFN (UFD) or TSSOP (FE) - exposed pad required for thermal performance; both packages support same pinout and functionality. |
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 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 or DCR network; sets overcurrent trip point with SENSE– and ITH voltage. |
| SENSE– | Differential current sense negative input | Bias source for current comparator when > INTVCC; referenced to output rail for accurate high-side sensing. |
| SS | Soft-start ramp control | Internal 10µA pull-up charges external capacitor to control startup dV/dt and inrush current limiting. |
| VFB | Feedback voltage input | Monitors output via resistor divider; regulates VOUT by comparing to 0.792–0.812V internal reference. |
| ITH | Error amplifier output / current limit control | Sets peak current threshold; higher voltage increases current limit; used for compensation and dynamic current adjustment. |
| TMR | Fault timer programming node | External capacitor sets switching-on time per fault event and cooldown duration before retry; critical for thermal management. |
| FREQ | Oscillator frequency control | Resistor-to-GND sets frequency from 50–900kHz; tied to GND or INTVCC selects fixed 350kHz or 535kHz modes. |
| WARNB | Open-drain fault warning output | Pulls low during switching (surge, overcurrent, startup) and cool-down; high-impedance in dropout mode; 60µs delay after dropout entry. |
| TG | Top-gate driver output | Floating high-side driver (SW to BOOST swing); drives external N-MOSFET gate with <25ns rise/fall times. |
| SW | Switch node connection | Connects to inductor and bottom-FET source; serves as return path for BOOST capacitor and TG driver supply. |
| BOOST | Bootstrap supply for top gate driver | Capacitor between BOOST and SW supplies floating gate drive; voltage ~DRVCC above SW during pass-through. |
| BG | Bottom-gate driver output | Ground-referenced driver (0 to DRVCC swing); synchronously controls bottom N-MOSFET with 50ns min off-to-on delay. |
| GND | Power and signal ground | All GND pins plus exposed pad must be connected to common PCB ground plane for noise immunity and thermal conduction. |
| DRVCC | Gate driver supply output | 5.8–9.4V LDO output powering TG/BG drivers; sourced from VIN or EXTVCC depending on DRVUV setting and voltage levels. |
| VIN | Main input supply | Primary power input (4–140V); powers internal circuitry and DRVCC LDO unless EXTVCC is active and above switchover threshold. |
| EXTVCC | External gate driver supply input | Alternative input for DRVCC LDO; activates when voltage exceeds 4.7V (DRVUV = GND) or 7.7V (DRVUV = INTVCC). |
| RUN | Enable/disable control | Logic input: <1.12V disables switching; <0.7V shuts down entire IC (IQ ≈ 10µA); tied to VIN for always-on operation. |
| DRVUV | DRVCC UVLO and switchover select | Configures DRVCC output (6V or 9V) and sets corresponding UVLO/EXTVCC switchover thresholds - must not float. |
| INTVCC | Internal 5V analog/digital supply | Stable 4.7–5.2V LDO output powering internal logic, comparators, and references; requires 0.1µF ceramic bypass. |
| OVLO | Overvoltage lockout input | Input disable: >1.2V disables switching while maintaining DRVCC/INTVCC regulation; connect to GND if unused. |
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 controller quiescent drop. |
| Adjustable output voltage clamp | Enables precise VOUT regulation during surges without secondary regulators - simplifies system BOM and improves transient response. |
| Programmable fault timer with cooldown | Allows thermal design optimized for dominant pass-through operation while safely handling short-duration high-power surges. |
| Dual current sensing options | Supports either discrete shunt resistors (high accuracy) or inductor DCR (cost/space savings) - accommodates varied design priorities. |
| Open-drain WARNB fault indicator | Provides system-level visibility into surge events, overcurrent faults, and startup sequencing - enables logging, diagnostics, and coordinated shutdown. |
| DRVCC supply flexibility | Automatic switchover between VIN and EXTVCC sources ensures robust gate drive under varying input conditions and reduces heat generation. |
Applications
| Automotive Load Dump Protection | ISO 7637-2 Transient Suppression |
|---|---|
Use Scenario: Protecting infotainment, ADAS, or telematics modules from 12V/24V vehicle bus surges during alternator load dump (up to 100V, 400ms). IC Role / Device Role / Timing Role: Acts as pre-regulator clamping VOUT to 28V or 34V during transients while passing nominal voltage unregulated during normal operation. Use Value: Enables use of standard 36V-rated downstream components instead of 100V+ rated parts, reducing system cost and complexity. | Use Scenario: Compliance with ISO 7637-2 Pulse 5a (load dump) and Pulse 1/2a/2b (switching transients) in commercial vehicles. IC Role / Device Role / Timing Role: Provides fast-acting, high-efficiency clamping with sub-100ns current-limit response and programmable fault timing to meet test pulse durations. Use Value: Eliminates need for TVS diodes alone - avoids catastrophic failure under repeated transients due to superior energy handling and thermal recovery. |
| MIL-STD-1275E Surge Protection | Industrial 48V DC Power Systems |
Use Scenario: Safeguarding avionics, radar, or communications equipment on 28V aircraft buses subjected to MIL-STD-1275E surges (up to 100V, 500ms). IC Role / Device Role / Timing Role: Functions as intelligent surge stopper with adjustable clamp voltage and fault timer, maintaining regulated output during extended transients. Use Value: Achieves >90% efficiency during surge regulation versus <40% for linear alternatives - enables higher sustained output current without oversized heatsinks. | Use Scenario: Protecting PLC I/O modules, motor drives, or sensors powered from 48V industrial DC distribution networks prone to switching spikes and lightning-induced surges. IC Role / Device Role / Timing Role: Pre-regulates 48V input to stable 24V or 36V output, absorbing transients up to 140V while maintaining uninterrupted operation. Use Value: Reduces reliance on upstream AC/DC converters with built-in surge ratings - lowers total system footprint and improves reliability in distributed power architectures. |
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 protector with integrated MOSFET; 4–40V VIN range; no switching capability; lower IQ (25µA) but limited to 3A continuous. | Best for low-current, space-constrained applications where efficiency during surge is secondary to simplicity and cost. | Select LTC4365HDE#PBF only when input voltage stays below 40V and output current remains ≤3A - unsuitable for 140V or 20A requirements of LTC7862IFE#TRPBF. |
| MAX6495ATA+T | High-voltage linear surge stopper; 4.5–60V VIN; integrated 100V MOSFET; 5A max; includes thermal foldback but no programmable timer or WARNB output. | Targeted at compact, self-contained protection for 12V/24V systems needing basic overvoltage cutoff without regulation. | Choose MAX6495ATA+T for plug-and-play protection where adjustable clamping, high current, or fault diagnostics are unnecessary - cannot replace LTC7862IFE#TRPBF in high-power or programmable designs. |
Compared with LTC4365HDE#PBF and MAX6495ATA+T, the LTC7862IFE#TRPBF uniquely delivers high-efficiency switching regulation across 4–140V inputs with full programmability of clamp voltage, current limit, fault timing, and gate drive - making it the only viable option for 20A automotive/military surge protection requiring sustained output during long transients.
Availability
LTC7862IFE#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, MIL-STD-1275E compliance, and industrial 48V DC power systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC7862IFE#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 LTC7862IFE#TRPBF belongs to Analog Devices' Power by Linear™ surge protection controller family, engineered specifically for high-reliability, high-efficiency transient suppression in demanding vehicular and military power systems.
FAQ
What is the maximum input voltage the LTC7862IFE#TRPBF can withstand?
The LTC7862IFE#TRPBF has an absolute maximum input voltage rating of 150V, with guaranteed operation from 4V to 140V. This makes it suitable for protecting against severe transients such as ISO 7637 load dump (100V) and MIL-STD-1275E (100V), while maintaining reliable function across wide industrial input ranges. Exceeding 150V risks permanent damage.
How does the LTC7862IFE#TRPBF handle overcurrent events?
The LTC7862IFE#TRPBF detects overcurrent via differential sensing at SENSE+ and SENSE– pins, using either an external shunt resistor or inductor DCR. It limits peak current by adjusting the ITH control voltage and initiates switching regulation if the fault persists beyond the TMR-programmed duration, then enters cooldown before retry. This protects both the IC and external MOSFETs.
Can the LTC7862IFE#TRPBF operate without external MOSFETs?
No, the LTC7862IFE#TRPBF is a controller only and requires two external N-channel MOSFETs - one high-side (MTOP) and one synchronous low-side (MBOT) - to implement the buck regulator during surge events. It does not integrate power switches. Typical implementations use Infineon BSC035N10NS5 or equivalent 100V+ rated devices.
What is the purpose of the WARNB pin on the LTC7862IFE#TRPBF?
The WARNB pin on the LTC7862IFE#TRPBF is an open-drain logic output that pulls low during all switching activity - including input overvoltage, overcurrent, short-circuit, and startup events - and remains low during cooldown. It transitions to high-impedance only in steady-state dropout mode, providing real-time system-level fault status without additional monitoring circuitry.
Does the LTC7862IFE#TRPBF support both QFN and TSSOP packages interchangeably?
Yes, the LTC7862IFE#TRPBF is specified for the 20-lead 4mm × 5mm QFN (UFD) package. While the LTC7862 family includes TSSOP variants (e.g., LTC7862IFE#PBF), the #TRPBF suffix denotes tape-and-reel QFN packaging. Pinout, electrical specs, and thermal characteristics differ between UFD and FE packages - direct PCB substitution is not supported without layout revision.
LTC7862IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC7862IFE#TRPBF FAQ
1.How can I place an order for LTC7862IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7862IFE#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 LTC7862IFE#TRPBF reliable?
The price and inventory of LTC7862IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7862IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7862IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7862IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7862IFE#TRPBF?
LTC7862IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7862IFE#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 LTC7862IFE#TRPBF?
For technical support, including LTC7862IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7862IFE#TRPBF requirements.
6.How does Aetrix verify that LTC7862IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7862IFE#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 LTC7862IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7862IFE#TRPBF?
All LTC7862IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7862IFE#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 LTC7862IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7862IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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