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Analog Devices Inc. LTC7862IFE#PBF
- Part No.:
- LTC7862IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7862IFE#PBF.pdf
- Description:
- 140V HIGH EFFICIENCY SWITCHING S
- Quantity:
- Payment:
- Shipping:
Inventory:2,547
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Product details
Overview
LTC7862IFE#PBF 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 output voltage up to 60V with adjustable current limiting via external MOSFETs. Used in automotive load dump (ISO 7637) and MIL-STD-1275 compliant systems.
For engineers reviewing the LTC7862IFE#PBF datasheet, LTC7862IFE#PBF pinout, LTC7862IFE#PBF application, or LTC7862IFE#PBF equivalent, key selection criteria include its 4V–140V input range, programmable fault timer, dual N-channel gate drive capability, RSENSE/DCR current sensing, and support for 50kHz–900kHz switching frequency with thermal-cooldown recovery behavior.
Technical Context
The LTC7862IFE#PBF implements a peak-current-mode synchronous buck controller architecture with fast comparator-based overcurrent protection and integrated gate drivers for top/bottom N-MOSFETs. Its dropout detection logic enables seamless transition between 100% pass-through and active switching modes without external supervision.
It features dual LDOs (INTVCC at 5V and DRVCC configurable at 6V/9V), programmable oscillator with fixed or resistor-set frequency, and a dedicated TMR pin that controls both switching duration and cooldown timing using an external capacitor-enabling thermal optimization for intermittent surge events rather than continuous operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V operating; absolute max 150V - supports wide industrial/automotive bus voltages including ISO7637 load dump and MIL-STD-1275 transients. |
| Output Clamp Voltage | Adjustable up to 60V via feedback divider - sets safe maximum output during overvoltage events while preserving load operation. |
| Switching Frequency | 50kHz to 900kHz (resistor-programmable) or fixed 320kHz/535kHz - balances EMI, efficiency, and component size for transient suppression. |
| Fault Timer Range | Configurable per 1µF TMR capacitor: 55ms initial fault window, 50ms retry period, 1700ms cooldown - prevents thermal runaway during sustained faults. |
| Gate Drive Capability | TG/BG drivers with 1Ω pull-down / 2.2Ω pull-up on TG, 1Ω pull-down / 2Ω pull-up on BG - directly drives high-side and synchronous low-side N-MOSFETs. |
| Current Sensing | RSENSE or inductor DCR sensing with 43–57mV max sense threshold - enables accurate overcurrent protection across temperature and load conditions. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and industrial environments requiring extended thermal reliability. |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+, SENSE– | Differential current sense inputs | Set overcurrent trip point via external shunt or DCR; SENSE– powers internal comparator when > INTVCC. |
| SS | Soft-start ramp control | Internal 10µA pull-up charges external capacitor to control output voltage rise time and limit inrush. |
| VFB | Feedback reference input | Compares against 0.792–0.812V internal reference to regulate output clamp voltage. |
| ITH | Error amplifier output | Sets current limit threshold; higher voltage increases current trip point linearly. |
| TMR | Fault timer capacitor node | Charged/discharged by internal current sources to define switching duration and cooldown intervals. |
| WARNB | Open-drain fault indicator | Pulls low during switching (surge, overcurrent, startup) and high-impedance in dropout/pass-through mode. |
| TG, BG | Top/bottom gate drivers | Drive external N-MOSFET gates; TG swings from SW to BOOST, BG from GND to DRVCC. |
| SW, BOOST, BG, GND | Power node connections | SW connects to inductor; BOOST supplies floating high-side driver; exposed GND pad mandatory for thermal rating. |
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 IC quiescent drop. |
| Programmable fault timer with cooldown | Enables oversized thermal design for short-duration surges only - reduces heatsink size and cost vs. continuous-rated solutions. |
| Dual independent LDOs (INTVCC/DRVCC) | INTVCC powers analog/digital core at 5V; DRVCC configurable at 6V/9V to match MOSFET gate drive requirements. |
| Fast peak-current overcurrent protection | Responds within one switching cycle to short-circuit or overload - avoids latch-up and enables auto-retry after cooldown. |
| DRVUV-selectable UVLO and EXTVCC switchover | DRVUV = GND → 4.2V UVLO / 4.7V EXTVCC switchover; DRVUV = INTVCC → 7.8V UVLO / 7.7V switchover - adapts to system supply architecture. |
Applications
| Automotive Load Dump Protection | ISO 7637-2 Compliant Power Input |
|---|---|
|
Use Scenario: Vehicle battery experiences 100V/400ms load dump event during alternator field decay. IC Role / Device Role / Timing Role: LTC7862IFE#PBF clamps output to 28V–34V while switching, then reverts to pass-through once VIN drops below clamp level. Use Value: Prevents damage to infotainment, ADAS, and telematics modules without derating downstream regulators for worst-case transients. |
Use Scenario: Industrial vehicle power system must survive repetitive ISO 7637-2 Pulse 5a (load dump) and Pulse 4 (cold crank). IC Role / Device Role / Timing Role: LTC7862IFE#PBF acts as pre-regulator, maintaining stable output during 12V–100V input excursions with <100µs response to overvoltage. Use Value: Eliminates need for bulky TVS diodes or inefficient linear surge suppressors - improves system efficiency and thermal margin. |
| MIL-STD-1275E Surge Protection | High-Power Industrial DC Bus Conditioning |
|
Use Scenario: Military ground vehicle encounters 100V/500ms surge per MIL-STD-1275E Section 4.5.2. IC Role / Device Role / Timing Role: LTC7862IFE#PBF regulates output at 28V during surge, using TMR capacitor to limit total switching time to 55ms before cooldown. Use Value: Enables use of standard 36V-rated downstream converters instead of 150V-rated components - reduces BOM cost and footprint. |
Use Scenario: Factory automation PLC requires robust 24V/20A supply tolerant of 140V lightning-induced transients on 48V DC distribution bus. IC Role / Device Role / Timing Role: LTC7862IFE#PBF operates in pass-through mode >99.9% of time, switching only during validated overvoltage events detected at OVLO pin. Use Value: Achieves >96% efficiency in normal operation and sustains 20A output during transients - outperforms linear alternatives by >4× power handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365HDE#PBF | Linear surge protector (no switching); 4–40V input; fixed 5.8V clamp; no external MOSFETs required. | Lower power handling (<3A), no programmable timer, no DCR sensing - suited for low-current signal rails, not 20A power paths. | Select LTC4365HDE#PBF only when input transients are <40V and output current <3A; LTC7862IFE#PBF is required for >40V or >5A applications. |
| TPS43060RTER | Non-synchronous buck controller; no integrated gate drivers; requires external high-side driver; 4.5–60V input. | Lacks built-in surge-specific features (TMR timer, WARNB, OVLO pin); needs additional circuitry for load dump compliance. | TPS43060RTER demands full custom design for surge protection; LTC7862IFE#PBF provides turnkey solution with validated timing, fault signaling, and thermal management. |
Compared with LTC4365HDE#PBF and TPS43060RTER, the LTC7862IFE#PBF uniquely integrates programmable fault timing, dual N-MOSFET gate drivers, and 140V input tolerance - enabling compact, high-current surge protection without external driver ICs or complex timing networks.
Availability
LTC7862IFE#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, MIL-STD-1275E compliance, and ISO 7637-2 power conditioning requiring stable component supply and long-term industrial availability.
Supply support for LTC7862IFE#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7862IFE#PBF belongs to Analog Devices' Power by Linear™ surge protection controller family, engineered specifically for high-voltage transient suppression in mission-critical automotive and defense systems where reliability under extreme input conditions is non-negotiable.
FAQ
What is the maximum input voltage the LTC7862IFE#PBF can withstand?
The LTC7862IFE#PBF has an absolute maximum input voltage rating of 150V, with guaranteed operation up to 140V. This allows it to handle severe automotive load dump events (e.g., 100V/400ms per ISO 7637-2) and MIL-STD-1275E transients while maintaining regulation. Exceeding 150V risks permanent damage per Absolute Maximum Ratings.
How does the LTC7862IFE#PBF switch between pass-through and regulation modes?
The LTC7862IFE#PBF monitors input voltage and load conditions continuously. When VIN remains below the programmed output clamp voltage and no overcurrent is detected, it holds the top N-MOSFET fully on (100% duty cycle). During overvoltage, overcurrent, or startup, it immediately activates synchronous buck regulation using TG/BG outputs - all without external intervention.
Can the LTC7862IFE#PBF be used with DCR current sensing instead of a shunt resistor?
Yes, the LTC7862IFE#PBF supports both RSENSE and inductor DCR current sensing via its differential SENSE+ and SENSE– inputs. DCR sensing eliminates power loss and board space associated with shunt resistors, and the IC's offset compensation maintains accuracy across temperature - confirmed in Electrical Characteristics tables and Applications Information.
What is the purpose of the TMR pin on the LTC7862IFE#PBF?
The TMR pin on the LTC7862IFE#PBF connects to an external capacitor that defines three critical timing intervals: (1) maximum allowed switching duration during fault (55ms/µF), (2) retry interval (50ms/µF), and (3) cooldown period (1700ms/µF). This prevents thermal saturation and enables component sizing optimized for pass-through operation rather than continuous switching.
Does the LTC7862IFE#PBF require external gate drivers for the MOSFETs?
No, the LTC7862IFE#PBF integrates high-current gate drivers for both top and bottom N-channel MOSFETs - TG drives the high-side switch with BOOST-referenced output, and BG drives the synchronous low-side switch referenced to GND. Each driver delivers >1A peak current with sub-30ns transition times, eliminating need for external drivers in typical implementations.
LTC7862IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC7862IFE#PBF FAQ
1.How can I place an order for LTC7862IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7862IFE#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 LTC7862IFE#PBF reliable?
The price and inventory of LTC7862IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7862IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7862IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7862IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7862IFE#PBF?
LTC7862IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7862IFE#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 LTC7862IFE#PBF?
For technical support, including LTC7862IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7862IFE#PBF requirements.
6.How does Aetrix verify that LTC7862IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7862IFE#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 LTC7862IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7862IFE#PBF?
All LTC7862IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7862IFE#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 LTC7862IFE#PBF part is unused and in its original packaging.
Return procedure for LTC7862IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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