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Analog Devices Inc. LTC7862EFE#TRPBF
- Part No.:
- LTC7862EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7862EFE#TRPBF.pdf
- Description:
- 140V HIGH EFFICIENCY SWITCHING S
- Quantity:
- Payment:
- Shipping:
Inventory:5,977
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Product details
Overview
LTC7862EFE#TRPBF from Analog Devices is a high-efficiency switching surge stopper controller that protects downstream loads from input overvoltage transients up to 140V while delivering up to 20A output current. It operates in 100% duty-cycle pass-through mode during normal conditions and switches into buck regulation during surges, overcurrents, or startup - with adjustable output clamp (up to 60V), programmable fault timer, and RSENSE/DCR current sensing. It is used in automotive load-dump protection compliant with ISO 7637 and MIL-STD-1275.
For engineers reviewing the LTC7862EFE#TRPBF datasheet, LTC7862EFE#TRPBF pinout, LTC7862EFE#TRPBF application, or LTC7862EFE#TRPBF equivalent, key selection considerations include its 4V–140V input range, 20-pin TSSOP package with exposed thermal pad, adjustable 50kHz–900kHz switching frequency, 0.792V feedback reference, and dual-mode operation (pass-through + regulated switching) for surge resilience without compromising efficiency.
Technical Context
The LTC7862EFE#TRPBF implements a peak-current-mode synchronous buck controller architecture with integrated gate drivers for external N-channel MOSFETs. Its functional core includes a transconductance error amplifier (gm = 2 mmho), fast current comparator referenced to ITH voltage, and programmable oscillator with internal 20µA FREQ pull-up current.
It features dual power domains: DRVCC (6V or 9V LDO, selectable via DRVUV pin) powers gate drivers, while INTVCC (5.0V ±3%) supplies analog/digital circuitry. The TMR pin controls both switching duration during faults (55 ms/µF typical) and cooldown timing (1700 ms/µF), enforcing strict thermal budgeting by limiting high-loss regulation intervals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports wide industrial/automotive bus voltages 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 in reference designs. |
| Switching Frequency | 50kHz to 900kHz - programmable via resistor on FREQ pin; enables optimization of size, EMI, and efficiency. |
| Feedback Reference | 0.792V (±0.8% over temp) - precise regulation point enabling accurate output voltage control with minimal drift. |
| Fault Timer Resolution | 55 ms per µF on TMR pin - defines maximum continuous switching time during overvoltage/overcurrent events. |
| Gate Driver Strength | TG/BG pull-up: 2.2Ω/2.0Ω; pull-down: 1.0Ω/1.0Ω - drives high-side and low-side MOSFETs with <25ns transition times at 3300pF load. |
| Operating Temp Range | –40°C to +125°C - qualified for automotive and industrial environments; junction max 150°C. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE) with exposed thermal pad (Pin 21 = GND). Requires soldering of exposed pad to PCB ground plane for rated electrical performance and θJA = 38°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+ | Differential current sense positive input | Connects to high-side of RSENSE; sets overcurrent trip threshold jointly with SENSE– and ITH voltage. |
| SENSE– | Differential current sense negative input | Biased above INTVCC during operation; supplies current comparator bias; supports DCR sensing. |
| SS | Soft-start ramp control | Internal 10µA pull-up charges external capacitor to control output voltage ramp rate during startup/retry. |
| VFB | Regulated feedback input | Compares against 0.792V reference; determines output clamp voltage via external resistor divider. |
| ITH | Error amplifier output & compensation node | Sets current limit threshold; used for loop compensation; voltage directly scales current sense trip point. |
| TMR | Fault timer timing input | Capacitor-to-ground sets switching-on duration (55 ms/µF) and cooldown period (1700 ms/µF). |
| FREQ | Oscillator frequency programming | 20µA internal pull-up develops voltage; resistor-to-GND selects 50–900kHz; tied to GND/INTVCC for fixed 350/535kHz. |
| WARNB | Open-drain fault indicator | Pulls low during switching (surge/overcurrent/startup), shutdown, or cooldown; high-Z after dropout entry (60µs delay). |
| TG | Top-gate driver output | Floating high-side driver (SW to BOOST swing); drives main N-MOSFET gate with 2.2Ω pull-up / 1.0Ω pull-down. |
| SW | Switch node connection | Connects to inductor and bottom MOSFET source; critical for layout; carries high di/dt during switching. |
| BOOST | Bootstrap supply for top gate driver | Capacitor between BOOST and SW provides floating rail; diode from BOOST to DRVCC maintains charge. |
| BG | Bottom-gate driver output | Ground-referenced driver (0V to DRVCC swing); drives synchronous N-MOSFET gate with 2.0Ω pull-up / 1.0Ω pull-down. |
| OVLO | Overvoltage lockout input | Threshold = 1.2V; disables switching if exceeded; maintains DRVCC/INTVCC regulation during event. |
| RUN | Enable/disable control | ON threshold = 1.12V; shutdown below 0.7V reduces IQ to 10µA; must not be left floating. |
| DRVUV | DRVCC regulation select & UVLO threshold config | Tied to GND → DRVCC = 6.0V; tied to INTVCC → DRVCC = 9.0V; also selects lower/higher UVLO thresholds. |
| INTVCC | Internal 5.0V LDO output | Powers internal analog/digital blocks; requires 0.1µF ceramic bypass close to pin. |
| DRVCC | Gate driver supply output | Supplies TG/BG drivers; sourced from VIN or EXTVCC LDO; requires ≥4.7µF low-ESR ceramic decoupling. |
| VIN | Main input supply | Primary power path; connects to vehicle/bus input; requires local ceramic bypass to GND. |
| EXTVCC | External gate driver supply input | Optional alternate source for DRVCC; switchover at 4.7V (DRVUV=GND) or 7.7V (DRVUV=INTVCC); max 14V. |
| GND | Power and signal ground | All GND pins (including exposed pad Pin 21) must be connected to common PCB ground plane for thermal/electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle pass-through mode | Minimizes conduction loss during normal operation - insertion loss dominated by MOSFET RDS(on), not regulator inefficiency. |
| Programmable fault timer with cooldown | Enables thermal design optimized for pass-through mode while safely handling short-duration surges up to 140V. |
| Adjustable output voltage clamp | Set from 0.8V reference via resistor divider - supports precise clamping (e.g., 28V, 34V) for MIL-STD-1275 compliance. |
| Dual current sensing options | Supports both discrete shunt (RSENSE) and inductor DCR sensing - reduces component count and improves accuracy at high currents. |
| Robust gate drivers with fast transitions | Sub-25ns rise/fall times and <60ns dead-time control enable efficient synchronous MOSFET switching at high frequencies. |
| Open-drain WARNB fault indicator | Provides system-level visibility into surge activity, overcurrent events, and fault recovery cycles without additional logic. |
Applications
| Automotive Load Dump Protection | ISO 7637-2 Compliant Power Supply |
|---|---|
|
Use Scenario: Vehicle battery system subjected to 100V/400ms load dump transients during alternator disconnection. IC Role / Device Role / Timing Role: LTC7862EFE#TRPBF acts as pre-regulator, clamping output to 34V while switching only during transient - passes nominal 12–28V unregulated. Use Value: Enables downstream 5V/3.3V converters to operate continuously without shutdown or damage during ISO 7637-2 Pulse 5a events. |
Use Scenario: Industrial control unit requiring stable 24V rail despite 24V bus fluctuations and spikes per ISO 7637-2. IC Role / Device Role / Timing Role: LTC7862EFE#TRPBF regulates output to 28V during surges >28V; otherwise operates in zero-loss pass-through mode. Use Value: Eliminates need for oversized linear regulators or TVS-based clamps - achieves >95% efficiency in normal operation. |
| MIL-STD-1275E Surge Protection | High-Current DC Power Distribution |
|
Use Scenario: Avionics subsystem powered from 28V aircraft bus experiencing 100V/500ms surges per MIL-STD-1275E. IC Role / Device Role / Timing Role: LTC7862EFE#TRPBF enters buck regulation only during surge, maintaining 28V output with 20A capability. Use Value: Meets MIL-STD-1275E Class A/B/C requirements while supporting higher sustained current than linear alternatives. |
Use Scenario: Data center rack power module delivering 20A to FPGA or ASIC with tight voltage tolerance and surge immunity. IC Role / Device Role / Timing Role: LTC7862EFE#TRPBF serves as intelligent front-end protector, combining low-loss pass-through with active transient suppression. Use Value: Reduces thermal stress on downstream components and eliminates need for parallel MOSFETs or external surge suppressors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS#PBF | Linear surge stopper IC; no external MOSFETs required; max 60V input; 3.5A continuous; no switching mode. | Lower current, simpler layout, but limited to ~10W dissipation; unsuitable for >5A sustained loads or 140V transients. | Select LTC4365IMS#PBF when board space and BOM count are prioritized over high-current surge resilience. |
| TPS43060RTER | Integrated synchronous buck controller with 65V max input; no built-in surge detection or pass-through mode; requires external OVLO circuitry. | Designed for standard DC/DC conversion, not dedicated surge protection; lacks TMR timer, WARNB, or 100% duty-cycle capability. | Select TPS43060RTER only when full custom surge logic is implemented externally and high-efficiency regulation is needed without pass-through. |
Compared with LTC4365IMS#PBF and TPS43060RTER, the LTC7862EFE#TRPBF uniquely combines 140V input tolerance, 20A capability, automatic 100% duty-cycle pass-through, and integrated fault timing - making it the only option qualified for MIL-STD-1275E and ISO 7637-2 at high current without external supervision logic.
Availability
LTC7862EFE#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, MIL-STD-1275E compliant power systems, and ISO 7637-2 industrial power distribution requiring stable component supply across extended temperature and high-reliability programs.
Supply support for LTC7862EFE#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 aerospace markets.
The LTC7862EFE#TRPBF belongs to Analog Devices' Power by Linear™ surge protection controller family, designed specifically for high-voltage transient resilience in mission-critical 12V/24V/28V systems where reliability under extreme input conditions is non-negotiable.
FAQ
What is the maximum input voltage rating for the LTC7862EFE#TRPBF?
The LTC7862EFE#TRPBF has an absolute maximum input voltage rating of 150V, with a specified operating input voltage range of 4V to 140V. This allows it to handle severe automotive and military transients such as ISO 7637-2 Pulse 5a (100V/400ms) and MIL-STD-1275E Class A surges (100V/500ms) while maintaining regulation. Operation beyond 140V is outside guaranteed specifications and may compromise reliability.
Does the LTC7862EFE#TRPBF require external MOSFETs, and what type are supported?
Yes, the LTC7862EFE#TRPBF is a controller IC and requires two external N-channel MOSFETs: one high-side (MTOP) and one synchronous low-side (MBOT). It supports logic-level and standard-threshold devices, with gate drivers capable of 2.2Ω pull-up and 1.0Ω pull-down strength. Reference designs use Infineon BSC035N10NS5, confirming compatibility with 100V-rated, low-RDS(on) trench MOSFETs.
How does the fault timer (TMR pin) function in the LTC7862EFE#TRPBF?
The TMR pin on the LTC7862EFE#TRPBF sets both the maximum allowable switching duration during overvoltage, overcurrent, or startup events (55 ms per µF) and the subsequent cooldown period before retry (1700 ms per µF). When the timer expires, the controller forces TG/BG off, enters cooldown, then automatically restarts - preventing thermal runaway and enabling component sizing based on average, not worst-case, power dissipation.
Can the LTC7862EFE#TRPBF operate without switching during normal conditions?
Yes - the LTC7862EFE#TRPBF is designed for 100% duty-cycle pass-through operation during normal input conditions. In this mode, the top external MOSFET remains fully enhanced, passing input voltage to the output with only RDS(on) conduction loss. Switching occurs exclusively during transients, overcurrents, or startup, minimizing quiescent loss and heat generation in steady-state operation.
What is the purpose of the WARNB pin on the LTC7862EFE#TRPBF?
The WARNB pin on the LTC7862EFE#TRPBF is an open-drain logic output that pulls low during any switching event - including input overvoltage, overcurrent, startup, shutdown, or cooldown - and goes high-impedance 60µs after entering dropout (pass-through) mode. It provides real-time system-level visibility into surge activity and fault recovery status without requiring additional monitoring circuitry.
LTC7862EFE#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
LTC7862EFE#TRPBF FAQ
1.How can I place an order for LTC7862EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7862EFE#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 LTC7862EFE#TRPBF reliable?
The price and inventory of LTC7862EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7862EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7862EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7862EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7862EFE#TRPBF?
LTC7862EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7862EFE#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 LTC7862EFE#TRPBF?
For technical support, including LTC7862EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7862EFE#TRPBF requirements.
6.How does Aetrix verify that LTC7862EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7862EFE#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 LTC7862EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7862EFE#TRPBF?
All LTC7862EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7862EFE#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 LTC7862EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7862EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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