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Analog Devices Inc. LTC7862IUFD#PBF
- Part No.:
- LTC7862IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC7862IUFD#PBF.pdf
- Description:
- 140V HIGH EFFICIENCY SWITCHING S
- Quantity:
- Payment:
- Shipping:
Inventory:7,831
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Product details
Overview
LTC7862IUFD#PBF 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 voltage (up to 60V), programmable fault timer, and dual N-channel MOSFET gate drive. It is used in automotive load dump protection compliant with ISO 7637 and MIL-STD-1275.
For engineers reviewing the LTC7862IUFD#PBF datasheet, LTC7862IUFD#PBF pinout, LTC7862IUFD#PBF application, or LTC7862IUFD#PBF equivalent, key selection criteria include input voltage range (4V–140V), adjustable VOUT clamp (up to 60V), 20-pin 4mm × 5mm QFN package, programmable switching frequency (50kHz–900kHz), and integrated fault timer with cooldown/retry behavior.
Technical Context
The LTC7862IUFD#PBF implements a peak-current-mode synchronous buck controller architecture with fast current comparator and adjustable ITH-based current limit. Its dual gate drivers (TG/BG) support external N-channel MOSFETs in high-side/low-side configuration, with BOOST charge pump enabling high-side drive during pass-through and switching modes.
It features two independent LDOs: INTVCC (5.0V ±3%) for internal analog/digital circuits and DRVCC (6.0V or 9.0V selectable via DRVUV pin) for gate drivers. The TMR pin controls both switching duration during faults and cooldown timing using an external capacitor, enforcing strict thermal budgeting by limiting high-loss operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 140V operating; 150V absolute max - supports wide industrial/automotive input including ISO 7637 load dump and MIL-STD-1275 surges. |
| VOUT Clamp | Adjustable up to 60V via feedback divider - sets safe regulated output during overvoltage events (e.g., clamped at 34V in typical 28V system). |
| Switching Freq | 50kHz to 900kHz programmable - enables optimization of efficiency, size, and EMI performance across diverse power stages. |
| Fault Timer | Programmable via CTMR capacitor - defines maximum switching time per fault event and cooldown period before retry (e.g., 55ms initial + 1.7s cooldown per µF). |
| Gate Drivers | TG/BG drivers with 1.0Ω pull-down / 2.0–2.2Ω pull-up - delivers fast edge rates (15–25ns) and supports high-current external MOSFETs. |
| Current Sense | RSENSE or DCR sensing with 43–57mV max threshold - enables precise overcurrent protection with minimal insertion loss. |
| Package | 20-pin 4mm × 5mm QFN with exposed thermal pad - rated for –40°C to +125°C junction temperature and θJA = 43°C/W. |
Pinout & Package
Package: 20-lead (4mm × 5mm) plastic QFN with exposed GND pad (Pin 21), rated for –40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+ | Differential current sense positive input | Connects to high-side of RSENSE or DCR network; sets current trip point jointly with SENSE– and ITH voltage. |
| SENSE– | Differential current sense negative input | Biased above INTVCC during operation; supplies current comparator bias; common-mode range up to 65V. |
| SS | Soft-start control input | Internal 10µA pull-up; capacitor to GND sets output ramp time during startup or fault retry. |
| VFB | Feedback voltage input | Regulates output by comparing against 0.792–0.812V reference; remote sensing enables accurate VOUT clamp setting. |
| ITH | Error amplifier output & compensation node | Controls current limit threshold; higher voltage increases trip point; used for loop compensation. |
| TMR | Fault timer input | External capacitor sets switching duration (55ms/µF) and cooldown time (1700ms/µF); open-drain warning logic tied to WARNB. |
| FREQ | Oscillator frequency control | 20µA internal pull-up; resistor to GND programs 50–900kHz; tie to GND or INTVCC for fixed 350kHz or 535kHz. |
| WARNB | Open-drain fault indicator | Pulls low during switching (overvoltage/overcurrent/startup), shutdown, or cooldown; high-impedance in dropout mode. |
| TG | Top gate driver output | Floating high-side driver (SW to BOOST swing); drives main N-MOSFET gate; supports 100% duty cycle in pass-through. |
| SW | Switch node connection | Connects to inductor and bottom MOSFET source; voltage swings from GND to VIN during operation. |
| OVLO | Overvoltage lockout input | Logic-high (>1.2V) disables switching; maintains DRVCC/INTVCC regulation; connect to GND if unused. |
| INTVCC | Internal 5V LDO output | Powers internal analog/digital blocks; requires 0.1µF ceramic bypass close to pin; not for external loading. |
| DRVUV | DRVCC regulation select & UVLO threshold set | Tie to GND → 6.0V DRVCC / lower UVLO thresholds; tie to INTVCC → 9.0V DRVCC / higher thresholds. |
| RUN | Enable/disable control | <1.12V disables controller; <0.7V forces full shutdown (10µA IQ); tie to VIN for always-on operation. |
| EXTVCC | External gate drive supply input | Enables DRVCC LDO switchover at 4.7V (DRVUV=GND) or 7.7V (DRVUV=INTVCC); max 14V rating. |
| VIN | Main input supply | Bypass with ≥22µF ceramic; powers INTVCC LDO and DRVCC LDO when EXTVCC is inactive. |
| DRVCC | Gate driver supply output | 6.0V or 9.0V regulated output; powers TG/BG drivers; requires ≥4.7µF low-ESR ceramic decoupling. |
| GND | Ground reference | All GND pins (including exposed pad Pin 21) must be connected to PCB ground plane for electrical integrity and thermal performance. |
| BG | Bottom gate driver output | Synchronous N-MOSFET driver (GND to DRVCC swing); complements TG for buck regulation during surges. |
| BOOST | Bootstrap supply for top gate driver | Capacitor between BOOST and SW provides floating supply; diode from BOOST to DRVCC maintains charge during pass-through. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle pass-through mode | Minimizes conduction loss (≈100mV drop at 20A) during normal operation - eliminates continuous switching losses and simplifies thermal design. |
| Programmable fault timer with cooldown | Enforces strict thermal budgeting by limiting cumulative switching time per fault; allows component sizing optimized for pass-through, not worst-case surge. |
| Dual gate drive with BOOST charge pump | Supports high-side N-MOSFET without external bootstrap circuitry; enables robust 100% duty cycle and fast transient response during surges. |
| Flexible current sensing | Accepts either discrete RSENSE or inductor DCR sensing - reduces BOM count and improves accuracy in high-current applications. |
| Wide input voltage range with dual LDOs | 4V–140V operation supported by independent INTVCC (5V) and DRVCC (6V/9V) regulators - ensures stable control and gate drive under extreme bus conditions. |
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 buses. IC Role / Device Role / Timing Role: Acts as pre-regulator clamping VOUT to 28V or 34V during surge; remains in 100% pass-through during normal cranking (12V) and run (14V). Use Value: Enables use of standard 36V-rated downstream DC/DC converters instead of 150V-input parts - reducing cost and footprint while meeting OEM surge immunity requirements. |
Use Scenario: Providing stable 28V output to mission-critical avionics systems subjected to ISO 7637-2 Pulse 5a (load dump) and Pulse 1 (battery disconnect). IC Role / Device Role / Timing Role: Regulates output during transients using synchronous buck topology; uses TMR timer to limit switching duration and prevent thermal runaway. Use Value: Achieves >95% efficiency during 100V/100ms surges - delivering 20A sustained output where linear surge stoppers would fail thermally or require oversized heatsinks. |
| MIL-STD-1275 Vehicle Power Interface | Industrial 48V DC Power Distribution |
|
Use Scenario: Conditioning 28V military vehicle bus subject to 100V/500ms surges per MIL-STD-1275E, Section 4.5.1. IC Role / Device Role / Timing Role: Clamps VOUT to 34V during surge; maintains uninterrupted power to radios, displays, and control units via seamless transition between pass-through and buck modes. Use Value: Eliminates need for TVS clamping alone (which cannot sustain 100V/500ms) - provides active regulation with controlled energy dissipation and automatic recovery. |
Use Scenario: Protecting PLC I/O modules and motor drives powered from 48V industrial DC bus experiencing switching transients up to 140V. IC Role / Device Role / Timing Role: Functions as front-end surge stopper with adjustable VOUT clamp (e.g., 52V) and programmable OCP - prevents downstream converter latch-up or damage. Use Value: Supports high-current (20A) operation with low insertion loss (<120mV at 20A) - preserves system efficiency while adding robust transient immunity beyond basic input filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching surge stopper applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365HDE#PBF | Linear surge stopper (no switching); 60V abs max; fixed 3.2V or adjustable OVP; no VOUT clamp programming. | Lower complexity, no inductor required; limited to ≤5A due to thermal constraints; unsuitable for long-duration or high-current surges. | Select when simplicity, ultra-low quiescent current (12µA), and sub-5A loads outweigh need for high-current surge handling. |
| MAX6495ATA+T | Switching surge stopper with integrated MOSFETs; 60V max VIN; fixed 5.5V/12V/15V VOUT options; no adjustable clamp or TMR timer. | Reduced BOM count (no external FETs); limited to 3A output; lacks programmable fault timing and wide VIN flexibility. | Select for compact, low-power embedded systems needing integrated solution with fixed outputs - not for 20A/140V industrial or automotive use. |
Compared with LTC4365HDE#PBF and MAX6495ATA+T, the LTC7862IUFD#PBF uniquely combines 140V input capability, 20A output, fully adjustable VOUT clamp and fault timing, and external MOSFET flexibility - making it the only option capable of high-reliability, high-power surge protection in demanding vehicular and military applications.
Availability
LTC7862IUFD#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, ISO 7637-2 compliance testing, and MIL-STD-1275E vehicle power interface designs requiring stable component supply and long-term lifecycle support.
Supply support for LTC7862IUFD#PBF 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, power management, and industrial control.
The LTC7862IUFD#PBF belongs to Analog Devices' Power by Linear™ surge protection controller family, designed specifically for high-reliability DC power conditioning in harsh environments including automotive, aerospace, and defense systems.
FAQ
What is the maximum input voltage the LTC7862IUFD#PBF can withstand?
The LTC7862IUFD#PBF has an absolute maximum input voltage rating of 150V, with guaranteed operation from 4V to 140V. This makes it suitable for protecting downstream circuits against severe transients such as ISO 7637 load dump (100V/400ms) and MIL-STD-1275E surges (100V/500ms). Operation beyond 140V is not specified and may compromise reliability or safety margins.
How does the LTC7862IUFD#PBF handle normal operation versus overvoltage events?
The LTC7862IUFD#PBF operates in 100% duty-cycle pass-through mode during normal input conditions - turning on the top N-MOSFET continuously to minimize voltage drop and power loss. During overvoltage, overcurrent, or startup events, it switches into synchronous buck regulation to clamp VOUT at a user-defined level. This dual-mode architecture ensures high efficiency in steady state and robust protection during faults.
Can the LTC7862IUFD#PBF be used with DCR current sensing?
Yes, the LTC7862IUFD#PBF supports both discrete RSENSE and inductor DCR current sensing via its differential SENSE+ and SENSE– inputs. When using DCR sensing, an RC network filters the inductor voltage to derive a proportional current signal. This eliminates the need for a separate sense resistor, reducing power loss and board space - especially beneficial in high-current applications like 20A automotive power distribution.
What is the purpose of the TMR pin on the LTC7862IUFD#PBF?
The TMR pin on the LTC7862IUFD#PBF sets both the maximum allowable switching duration during overvoltage, overcurrent, or startup events and the cooldown period before automatic retry. An external capacitor determines these times (e.g., 55ms initial fault window and 1700ms cooldown per µF). This feature enforces thermal safety by preventing indefinite high-loss operation - allowing external components to be sized for pass-through mode rather than worst-case surge conditions.
Does the LTC7862IUFD#PBF support external gate drive supply?
Yes, the LTC7862IUFD#PBF supports an external gate drive supply via the EXTVCC pin. When EXTVCC exceeds its switchover threshold (4.7V or 7.7V depending on DRVUV pin state), the internal LDO automatically switches from VIN to EXTVCC to power DRVCC. This enables efficient gate drive from a dedicated low-noise supply - improving noise immunity and reducing power loss in high-frequency or high-current designs.
LTC7862IUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 20-WFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tube
- 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)
LTC7862IUFD#PBF FAQ
1.How can I place an order for LTC7862IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7862IUFD#PBF 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 LTC7862IUFD#PBF reliable?
The price and inventory of LTC7862IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7862IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7862IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7862IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7862IUFD#PBF?
LTC7862IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7862IUFD#PBF 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 LTC7862IUFD#PBF?
For technical support, including LTC7862IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7862IUFD#PBF requirements.
6.How does Aetrix verify that LTC7862IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7862IUFD#PBF 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 LTC7862IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7862IUFD#PBF?
All LTC7862IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7862IUFD#PBF, 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 LTC7862IUFD#PBF part is unused and in its original packaging.
Return procedure for LTC7862IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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