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Analog Devices Inc. LTC7862HFE#TRPBF
- Part No.:
- LTC7862HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7862HFE#TRPBF.pdf
- Description:
- 140V HIGH EFFICIENCY SWITCHING S
- Quantity:
- Payment:
- Shipping:
Inventory:4,357
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Product details
Overview
LTC7862HFE#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, 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 LTC7862HFE#TRPBF datasheet, LTC7862HFE#TRPBF pinout, LTC7862HFE#TRPBF application, or LTC7862HFE#TRPBF equivalent, key selection criteria include its 4V–140V input range, adjustable fault timer, RSENSE/DCR current sensing, open-drain WARNB fault indicator, and support for 50kHz–900kHz switching frequency with external MOSFET control.
Technical Context
The LTC7862HFE#TRPBF implements a peak-current-mode synchronous buck controller architecture with dual N-channel MOSFET gate drivers (TG and BG), integrated charge pump for high-side drive, and programmable fault timer (TMR) that enforces strict switching duration limits during overvoltage, overcurrent, or startup events. Its dropout detection logic enables seamless transition between 100% pass-through and regulated switching modes.
It features dual independent LDOs: INTVCC (5.0V ±3%) powers internal analog/digital circuitry, and DRVCC (6.0V or 9.0V selectable via DRVUV pin) supplies gate drivers. Current sensing uses differential SENSE+/SENSE– inputs compatible with either shunt resistors or inductor DCR, with trip threshold adjustable via ITH voltage (43–57mV typical).
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 surges. |
| Output Clamp Voltage | Adjustable up to 60V - set by external resistor divider on VFB; enables safe pre-regulation of sensitive downstream loads. |
| Switching Frequency | 50kHz to 900kHz - programmable via FREQ pin resistor; allows optimization of size, efficiency, and EMI in compact designs. |
| Fault Timer Range | 52–58ms/µF (initial fault), 50ms/µF (retry), 1700ms/µF (cool-down) - ensures thermal safety by limiting cumulative switching time during transients. |
| Operating Junction Temp | –40°C to +150°C - H-grade qualification enables use in under-hood automotive and high-temp industrial environments. |
| Gate Driver Outputs | TG and BG drivers with 2.2Ω pull-up / 1.0Ω pull-down - delivers fast rise/fall times (25ns/15ns) for efficient MOSFET switching at high frequencies. |
| Current Sense Threshold | 43mV to 57mV (typical) - precise, temperature-stable trip point set by ITH voltage; supports accurate overcurrent protection. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE package), 4mm × 6.5mm body, exposed pad (Pin 21) connected to GND for thermal and electrical performance. Rated θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+ | Differential current sense (+) | Positive input to current comparator; used with SENSE– to detect overcurrent via RSENSE or DCR. |
| SENSE– | Differential current sense (–) | Negative input to current comparator; supplies bias current when > INTVCC; enables high-side sensing. |
| SS | Soft-start ramp control | Internal 10µA pull-up charges external capacitor to control output voltage ramp rate during startup/retry. |
| VFB | Feedback reference input | Regulates output clamp voltage to 0.792–0.812V; connects to resistor divider from VOUT for precise clamping. |
| ITH | Error amplifier output | Sets current limit threshold (43–57mV); also serves as compensation node for loop stability. |
| TMR | Fault timer timing input | External capacitor sets switching duration limits and cooldown timing; internal current sources define thresholds. |
| FREQ | Oscillator frequency control | Resistor-to-GND sets frequency (50–900kHz); tied to GND or INTVCC for fixed 350kHz or 535kHz operation. |
| WARNB | Open-drain fault indicator | Pulls low during switching (surge/overcurrent/startup), shutdown, or cooldown; high-Z after dropout entry (60µs delay). |
| TG | Top N-MOSFET gate driver | Floating high-side driver output (SW to BOOST swing); drives main switch with fast transitions and low impedance. |
| SW | Switch node connection | Connects to inductor and bottom MOSFET source; critical for layout; carries high di/dt during switching. |
| OVLO | Overvoltage lockout input | Logic-high (>1.2V) disables switching; maintains DRVCC/INTVCC regulation during OVLO event. |
| INTVCC | Internal 5V LDO output | Powers internal analog/digital blocks; requires 0.1µF ceramic bypass close to pin for stability. |
| RUN | Enable/disable control | Below 1.12V disables controller; below 0.7V forces full shutdown (10µA IQ); must not be left floating. |
| DRVUV | DRVCC regulation select | Tied to GND → 6.0V DRVCC; tied to INTVCC → 9.0V DRVCC; also selects UVLO/EXTVCC switchover thresholds. |
| VIN | Main supply input | Primary power input (4–140V); requires local ceramic bypass to GND near pin. |
| DRVCC | Gate driver supply output | Supplies TG/BG drivers; sourced from VIN or EXTVCC LDO; requires ≥4.7µF low-ESR ceramic decoupling. |
| GND | Signal and power ground | All GND pins plus exposed pad (Pin 21) must be soldered to PCB ground plane for rated thermal/electrical performance. |
| BOOST | High-side bootstrap supply | Charged via external diode/capacitor from DRVCC; provides floating supply for TG driver during pass-through. |
| BG | Bottom N-MOSFET gate driver | Ground-referenced driver output (0–DRVCC swing); drives synchronous rectifier with low on-resistance. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle pass-through mode | Eliminates switching loss during normal operation, reducing conduction loss to MOSFET RDS(on) × IOUT² and enabling high-efficiency "wire-like" behavior. |
| Programmable fault timer with cooldown | Enables thermal design optimized for pass-through mode only; prevents sustained high-power dissipation during transients. |
| Dual LDO architecture (INTVCC + DRVCC) | Separates low-noise analog/digital supply (5V) from high-current gate drive supply (6V/9V), improving noise immunity and drive capability. |
| Adjustable output voltage clamp | Allows precise setting of safe output ceiling (e.g., 28V, 34V, or 48V) using standard resistor values, matching downstream load requirements. |
| Open-drain WARNB fault signal | Provides system-level fault indication without additional logic; supports direct connection to microcontroller interrupt or status LED. |
| RSENSE or inductor DCR sensing | Offers flexibility in current monitoring: shunt-based for accuracy or DCR-based for cost/space savings, both with same interface. |
Applications
| Automotive Load Dump Protection | ISO 7637-2 Compliant Power Supply |
|---|---|
Use Scenario: Protecting infotainment, ADAS, or telematics modules from 12V/24V vehicle bus surges up to 100V lasting 400ms. IC Role / Device Role / Timing Role: Pre-regulator that clamps VOUT to 28V or 34V during load dump, then reverts to 100% pass-through once bus stabilizes. Use Value: Enables use of lower-voltage-rated downstream ICs (e.g., 3.3V/5V MCUs) without oversized input capacitors or linear regulators. | Use Scenario: Meeting ISO 7637-2 Pulse 5a (load dump) and Pulse 1/2a (switching transients) in commercial vehicle ECUs. IC Role / Device Role / Timing Role: Surge stopper operating in dropout mode >99% of time; switches only during defined transient windows per test standard. Use Value: Achieves >95% efficiency in normal operation and sustains 20A output during 100ms surges-exceeding linear alternatives. |
| MIL-STD-1275E Vehicle Power Interface | Industrial 48V DC Power Distribution |
Use Scenario: Power conditioning for avionics or ground vehicle electronics subjected to 28V nominal bus with 100V/500ms surges and –16V cranking dips. IC Role / Device Role / Timing Role: High-reliability pre-regulator with H-grade (–40°C to +150°C) operation and fault timer limiting total switching time per surge event. Use Value: Eliminates need for bulky TVS arrays or inefficient linear solutions; reduces board area and thermal management complexity. | Use Scenario: Protecting PLC I/O modules, motor drives, or PoE++ infrastructure from 48V bus transients caused by inductive load switching or hot-plug events. IC Role / Device Role / Timing Role: Clamps output to 52V during overvoltage, maintaining uninterrupted operation of 48V-rated equipment. Use Value: Supports high-current (20A) delivery with minimal insertion loss (<150mV at 20A with 3mΩ RDS(on) MOSFETs), improving system energy efficiency. |
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 protector (no switching); 4–80V input; fixed 5.8V/13.7V clamp options; no external MOSFETs required. | Lower output current (max 2.5A), higher power loss during surges; suited for low-power, space-constrained applications. | Select LTC4365 when simplicity, BOM count, and ultra-low quiescent current (<15µA) outweigh need for high output current or efficiency. |
| LTC7860HUFD#TRPBF | Pin-compatible switching surge stopper; identical functionality but in 4mm × 5mm QFN package; same H-grade temp range (–40°C to +150°C). | Same electrical performance; differs only in package (QFN vs TSSOP), offering better thermal resistance (θJC = 3.4°C/W vs 10°C/W) and smaller footprint. | Select LTC7860HUFD#TRPBF when PCB space or thermal performance is critical; otherwise, LTC7862HFE#TRPBF offers mature TSSOP assembly compatibility. |
Compared with LTC4365IMS#PBF, the LTC7862HFE#TRPBF delivers 8× higher output current and 3× lower power loss during surges; compared with LTC7860HUFD#TRPBF, it trades slightly higher thermal resistance for proven TSSOP manufacturability and easier hand-soldering.
Availability
LTC7862HFE#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, MIL-STD-1275E compliance, and industrial 48V DC distribution requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC7862HFE#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 LTC7862 belongs to Analog Devices' Power by Linear™ surge protection controller family, engineered specifically for high-reliability pre-regulation in harsh voltage environments where linear solutions fail due to thermal or current limitations.
FAQ
What is the maximum input voltage rating for the LTC7862HFE#TRPBF?
The LTC7862HFE#TRPBF has an absolute maximum input supply voltage (VIN) rating of 150V, with a specified operating input voltage range of 4V to 140V. This enables robust operation in MIL-STD-1275E and ISO 7637-2 compliant systems where transient surges reach 100V. Exceeding 150V may cause permanent damage.
How does the LTC7862HFE#TRPBF handle overvoltage events without external intervention?
The LTC7862HFE#TRPBF autonomously detects overvoltage via its OVLO pin or internal VIN monitoring, then initiates synchronous buck regulation using external N-MOSFETs to clamp VOUT to the programmed level. The integrated fault timer (TMR) limits switching duration, followed by a cooldown period before automatic retry-no host MCU required.
Can the LTC7862HFE#TRPBF operate with only one external MOSFET?
No-the LTC7862HFE#TRPBF requires two external N-channel MOSFETs: one high-side (MTOP) driven by TG and one synchronous low-side (MBOT) driven by BG. Its architecture relies on synchronous buck topology for high efficiency; omitting MBOT would disable regulation and risk shoot-through or uncontrolled operation.
What is the purpose of the DRVUV pin on the LTC7862HFE#TRPBF?
The DRVUV pin on the LTC7862HFE#TRPBF selects the DRVCC LDO output voltage (6.0V when tied to GND, 9.0V when tied to INTVCC) and determines the UVLO and EXTVCC switchover thresholds. It directly affects gate drive strength, MOSFET turn-on speed, and system-level fault response timing.
Does the LTC7862HFE#TRPBF support inductor DCR current sensing?
Yes-the LTC7862HFE#TRPBF supports both RSENSE shunt and inductor DCR current sensing via its differential SENSE+ and SENSE– inputs. When using DCR, an RC network filters the inductor voltage to generate a proportional current-sense signal, enabling accurate overcurrent protection without added power loss.
LTC7862HFE#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
LTC7862HFE#TRPBF FAQ
1.How can I place an order for LTC7862HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7862HFE#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 LTC7862HFE#TRPBF reliable?
The price and inventory of LTC7862HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7862HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7862HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7862HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7862HFE#TRPBF?
LTC7862HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7862HFE#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 LTC7862HFE#TRPBF?
For technical support, including LTC7862HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7862HFE#TRPBF requirements.
6.How does Aetrix verify that LTC7862HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7862HFE#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 LTC7862HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7862HFE#TRPBF?
All LTC7862HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7862HFE#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 LTC7862HFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7862HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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