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Analog Devices Inc. LTC7862HUFD#TRPBF
- Part No.:
- LTC7862HUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC7862HUFD#TRPBF.pdf
- Description:
- 140V HIGH EFFICIENCY SWITCHING S
- Quantity:
- Payment:
- Shipping:
Inventory:2,551
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Product details
Overview
LTC7862HUFD#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, clamping VOUT to a user-adjustable level up to 60V. Designed for automotive load dump (ISO 7637), MIL-STD-1275, and industrial power rail protection, it uses external N-channel MOSFETs and supports RSENSE or DCR current sensing.
For engineers reviewing the LTC7862HUFD#TRPBF datasheet, LTC7862HUFD#TRPBF pinout, LTC7862HUFD#TRPBF application, or LTC7862HUFD#TRPBF equivalent, key selection criteria include its 4V–140V input range, programmable fault timer, adjustable 50kHz–900kHz switching frequency, open-drain WARNB fault indicator, and –40°C to +150°C junction temperature rating in the 4mm × 5mm QFN package.
Technical Context
The LTC7862HUFD#TRPBF implements a peak-current-mode synchronous buck controller architecture with dual gate drivers (TG/BG) for external N-MOSFETs, integrated charge pump for high-side drive, and precision feedback amplifier referenced to 0.796V typical VFB. Its fast current comparator enables adjustable overcurrent protection via ITH voltage control, while the TMR pin governs both switching duration during faults and cooldown/retry timing using an external capacitor.
It features dual DRVCC regulation paths - from VIN or EXTVCC - selected by DRVUV pin state, with switchover thresholds at 4.7V/7.7V. The device includes undervoltage lockout (UVLO) on RUN (1.12V threshold), OVLO on dedicated pin (1.2V rising), and thermal shutdown. In dropout mode, TG remains continuously on with 100% duty cycle, minimizing conduction loss; during transients, it transitions seamlessly to regulated switching with soft-start and current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 140V operating; 150V absolute max - supports wide-input industrial and vehicle bus applications including ISO 7637 load dump and MIL-STD-1275. |
| VOUT Clamp Range | Adjustable up to 60V via feedback divider - enables precise output voltage regulation during overvoltage events. |
| Switching Frequency | 50kHz to 900kHz programmable via FREQ pin resistor - allows optimization of efficiency, size, and EMI for specific system constraints. |
| Current Sensing | RSENSE or inductor DCR sensing - provides flexible, accurate overcurrent protection without requiring sense resistors in high-current paths. |
| Fault Timer (TMR) | Programmable initial fault period (55ms/µF) and retry interval (50ms/µF) - limits thermal stress and enables safe recovery after transient events. |
| Operating Temp | –40°C to +150°C junction temperature - qualified for under-hood automotive and harsh-environment industrial use. |
| Package | 20-pin 4mm × 5mm QFN with exposed thermal pad - delivers θJA = 43°C/W for reliable high-power operation. |
Pinout & Package
Package: 20-lead (4mm × 5mm) plastic QFN with exposed GND pad (Pin 21). Thermal pad must be soldered to PCB for rated electrical performance and thermal dissipation (θJA = 43°C/W, θJC = 3.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+ | Differential current sense positive input | Connects to high-side of RSENSE; used with SENSE– to set overcurrent trip point via ITH voltage. |
| SENSE– | Differential current sense negative input | Biased above INTVCC during operation; supplies current comparator bias current (900µA typical at 28V). |
| SS | Soft-start ramp control | Internal 10µA pull-up sets startup time with external capacitor; regulates VFB to smaller of 0.8V or SS voltage. |
| VFB | Feedback voltage input | Monitors output via resistor divider; regulated to 0.796V typical - determines output clamp voltage accuracy. |
| ITH | Error amplifier output / current limit control | Controls current comparator threshold; increasing ITH raises current limit - enables programmable OCP. |
| TMR | Fault timer input | External capacitor sets switching duration during overvoltage/overcurrent; controls cooldown and retry timing. |
| FREQ | Oscillator frequency programming | Resistor-to-GND sets 50–900kHz; tied to GND = 350kHz, to INTVCC = 535kHz - enables EMI tuning. |
| WARNB | Open-drain fault warning output | Pulls low during switching (surge/OCP/startup), high-Z in dropout - signals active regulation to system controller. |
| TG | Top gate driver output | Floating high-side driver (SW to BOOST swing); drives main N-MOSFET gate with <25ns rise/fall times. |
| SW | Switch node connection | Connects to inductor and source of bottom MOSFET; critical for layout - requires low-inductance path to minimize ringing. |
| BOOST | Bootstrap supply for top gate driver | Capacitor between BOOST and SW generates floating supply; voltage ≈ DRVCC + (VIN − SW) during switching. |
| BG | Bottom gate driver output | GND-referenced driver (0 to DRVCC swing); drives synchronous N-MOSFET with matched timing to TG. |
| GND | Power and signal ground | All GND pins plus exposed pad must be connected to common low-impedance plane - essential for noise immunity and thermal performance. |
| DRVCC | Gate driver supply output | 5.8–9.4V LDO output powering TG/BG drivers; sourced from VIN or EXTVCC based on DRVUV setting. |
| VIN | Main input supply | Primary power input (4–140V); powers internal circuitry and DRVCC LDO when EXTVCC is inactive. |
| EXTVCC | External gate driver supply input | Alternative DRVCC source (7–13V); bypasses VIN LDO when >4.7V/7.7V - improves efficiency at high VIN. |
| RUN | Enable/disable control | Logic-high (>1.12V) enables operation; <0.7V forces full shutdown (10µA quiescent current). |
| DRVUV | DRVCC UVLO and regulation select | Tied to GND → DRVCC = 6.0V, UVLO = 4.2V; tied to INTVCC → DRVCC = 9.0V, UVLO = 7.8V - configures LDO behavior. |
| INTVCC | Internal 5V LDO output | Supplies analog/digital core circuits; requires 0.1µF ceramic decoupling close to pin - critical for stability. |
| OVLO | Overvoltage lockout input | Input >1.2V disables switching while maintaining DRVCC/INTVCC regulation - provides independent surge disable path. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle pass-through mode | Eliminates switching loss during normal operation - achieves ultra-low insertion loss (<100mV drop at 20A with optimal MOSFETs). |
| Programmable fault timer with cooldown | Prevents thermal runaway during sustained surges - enables component sizing optimized for nominal operation, not worst-case transients. |
| Adjustable output voltage clamp | Supports precise VOUT regulation (e.g., 28V, 34V, 48V) across wide input ranges - replaces multiple fixed-clamp solutions. |
| Synchronous N-MOSFET gate drivers | Integrated TG/BG drivers with <25ns transition times and 1Ω pull-down resistance - reduces external component count and layout complexity. |
| Flexible current sensing | Supports both discrete RSENSE and lossless inductor DCR sensing - lowers BOM cost and improves efficiency in high-current designs. |
| Wide temperature grade (–40°C to +150°C) | Qualified for under-hood automotive and industrial environments - eliminates derating concerns in high-ambient applications. |
Applications
| Automotive Load Dump Protection | ISO 7637-2 Compliant Power Supply |
|---|---|
|
Use Scenario: Protecting infotainment ECUs and ADAS modules from 100V/400ms load dump transients on 12V/24V vehicle batteries. IC Role / Device Role / Timing Role: Acts as pre-regulator clamping VOUT to 28V during surge; maintains 100% pass-through during cranking (12V min). Use Value: Enables use of standard 30V-rated downstream components instead of costly 100V+ rated parts - reduces system BOM cost by ~18%. |
Use Scenario: Powering telematics gateways requiring stable 5V/3.3V rails despite ISO 7637-2 Pulse 5a (100V/400ms) and Pulse 5b (−100V/100ms) transients. IC Role / Device Role / Timing Role: Regulates intermediate 28V bus during surges; passes through nominal 24V input otherwise - ensures uninterrupted downstream DC/DC operation. Use Value: Eliminates need for oversized input capacitors and linear pre-regulators - cuts solution size by 35% vs. LTC4363-based designs. |
| MIL-STD-1275E Vehicle Power Interface | Industrial 48V DC Power Distribution |
|
Use Scenario: Securing avionics subsystems against MIL-STD-1275E Class A/B/C surges (up to 100V/500ms) on 28V aircraft buses. IC Role / Device Role / Timing Role: Clamps VOUT to 34V during transients; reverts to wire-like conduction post-surge - meets MIL-STD-461 RS103 conducted emissions limits. Use Value: Achieves >96% efficiency in pass-through mode and >92% during 100V/20A surge - extends thermal design margin by 22°C vs. linear alternatives. |
Use Scenario: Protecting PLC I/O modules and motor drives from 48V bus transients caused by inductive load switching or lightning-induced surges. IC Role / Device Role / Timing Role: Limits VOUT to 52V during 140V transients; sustains 20A output with programmable 100ms fault window - prevents downstream brownouts. Use Value: Supports RSENSE-based current limiting with ±3% accuracy - enables precise short-circuit response without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4363IDE#PBF | Linear surge stopper; 4–80V input; fixed 3.3V/5V/12V outputs; no external MOSFETs required. | Lower power capability (≤3A), no programmable clamp; suited for low-current logic rails, not high-current power buses. | Select LTC4363IDE#PBF only for sub-5A applications where simplicity and fixed output outweigh efficiency needs. |
| TPS43060RTER | 40V max input; integrated 60V/3A MOSFETs; no external high-side driver; 2.2–40V input range. | Not rated for >40V transients; lacks programmable fault timer and 140V capability - unsuitable for MIL-STD-1275 or ISO 7637. | Choose TPS43060RTER for compact 24V industrial systems with <40V surge requirements and space-constrained layouts. |
Compared with LTC4363IDE#PBF and TPS43060RTER, the LTC7862HUFD#TRPBF uniquely combines 140V input tolerance, 20A output capability, fully programmable VOUT clamp, and fault-timed switching - making it the only option for high-power automotive and military surge protection where efficiency, thermal management, and transient resilience are co-critical.
Availability
LTC7862HUFD#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, MIL-STD-1275E compliance, and industrial 48V DC distribution systems requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for LTC7862HUFD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC7862HUFD#TRPBF belongs to Analog Devices' Power by Linear™ surge protection controller family, engineered specifically for high-efficiency, high-reliability pre-regulation in harsh-input environments such as vehicle power systems and military-grade power interfaces.
FAQ
What is the maximum input voltage the LTC7862HUFD#TRPBF can withstand?
The LTC7862HUFD#TRPBF has an absolute maximum input voltage rating of 150V, with guaranteed operation from 4V to 140V. This makes the LTC7862HUFD#TRPBF suitable for protecting against severe transients such as ISO 7637-2 Pulse 5 (100V/400ms) and MIL-STD-1275E Class C (100V/500ms), while maintaining regulation and reliability throughout its specified –40°C to +150°C junction temperature range.
How does the LTC7862HUFD#TRPBF handle overcurrent faults?
The LTC7862HUFD#TRPBF detects overcurrent using differential sensing at SENSE+ and SENSE– pins, with trip threshold controlled by the ITH voltage. When current exceeds the programmed limit, it initiates switching regulation and activates the TMR timer. If the fault persists beyond the TMR-set duration, the LTC7862HUFD#TRPBF enters cooldown mode and retries automatically - preventing thermal damage while maintaining system awareness via the WARNB pin.
Can the LTC7862HUFD#TRPBF operate without external MOSFETs?
No, the LTC7862HUFD#TRPBF is a controller-only IC and requires two external N-channel MOSFETs: one high-side (MTOP) and one synchronous low-side (MBOT). It provides dedicated TG and BG gate drivers but contains no power switches internally. This architecture enables scalable current handling (e.g., 20A with Infineon BSC035N10NS5) and thermal optimization unattainable with integrated-switch alternatives.
What is the purpose of the DRVUV pin on the LTC7862HUFD#TRPBF?
The DRVUV pin on the LTC7862HUFD#TRPBF serves a dual function: it selects the DRVCC regulator output voltage (6.0V when tied to GND, 9.0V when tied to INTVCC) and determines the UVLO thresholds for both DRVCC and EXTVCC switchover (4.2V/4.7V or 7.8V/7.7V respectively). This allows designers to match gate drive requirements of specific external MOSFETs while optimizing system efficiency across input voltage ranges.
Does the LTC7862HUFD#TRPBF support DCR current sensing?
Yes, the LTC7862HUFD#TRPBF supports both discrete RSENSE and inductor DCR current sensing. The SENSE+ and SENSE– inputs accept the differential voltage across either a sense resistor or the DCR of a power inductor, enabling accurate overcurrent protection without additional power loss or board area. DCR sensing is particularly valuable in high-current applications where minimizing heat generation is critical.
LTC7862HUFD#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)
LTC7862HUFD#TRPBF FAQ
1.How can I place an order for LTC7862HUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7862HUFD#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 LTC7862HUFD#TRPBF reliable?
The price and inventory of LTC7862HUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7862HUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7862HUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7862HUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7862HUFD#TRPBF?
LTC7862HUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7862HUFD#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 LTC7862HUFD#TRPBF?
For technical support, including LTC7862HUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7862HUFD#TRPBF requirements.
6.How does Aetrix verify that LTC7862HUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7862HUFD#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 LTC7862HUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7862HUFD#TRPBF?
All LTC7862HUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7862HUFD#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 LTC7862HUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7862HUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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