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Analog Devices Inc. LTC7862HFE#PBF
- Part No.:
- LTC7862HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7862HFE#PBF.pdf
- Description:
- SURGE SUPP SWITCHING 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:162
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Product details
Overview
LTC7862HFE#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 operation (VIN ≤ VCLAMP), and switches into buck regulation during surges, overcurrent, or startup-clamping VOUT to a user-adjustable level up to 60V with 28V/20A capability. Used in MIL-STD-1275, ISO 7637-2 automotive load dump, and avionic power conditioning systems.
For engineers reviewing the LTC7862HFE#PBF datasheet, LTC7862HFE#PBF pinout, LTC7862HFE#PBF application, or LTC7862HFE#PBF equivalent, key selection considerations include its –40°C to 150°C guaranteed junction temperature range, programmable fault timer with cooldown restart, dual gate drive for external N-MOSFETs, adjustable output voltage clamp, and RSENSE/DCR current sensing architecture.
Technical Context
The LTC7862HFE#PBF implements a peak-current-mode synchronous buck controller with fast comparator-based overcurrent protection and adaptive dropout detection. Its internal 5V INTVCC LDO powers analog circuitry, while DRVCC (6V or 9V selectable via DRVUV) supplies gate drivers with UVLO thresholds tied to that setting.
It features a programmable oscillator (50kHz–900kHz), adjustable soft-start via SS pin, open-drain WARNB fault indicator with 60µs delay, and TMR pin-based timing control for switching duration limits during overvoltage, overcurrent, or startup events-enabling thermal optimization for predominantly pass-through operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Operating Range | 4V to 140V - supports wide-input industrial, military, and automotive bus voltages including ISO 7637 load dump and MIL-STD-1275 surges. |
| VOUT Clamp Range | Adjustable up to 60V - set by external resistor divider on VFB; enables safe clamping at 28V, 34V, or other system-specific levels. |
| Max Output Current | 20A - achievable with appropriate external MOSFETs (e.g., Infineon BSC035N10NS5) and inductor (e.g., Coilcraft SER2918H-682KL). |
| Switching Frequency | 50kHz to 900kHz - programmable via FREQ pin resistor; allows EMI optimization and inductor size trade-offs. |
| Junction Temp Range | –40°C to 150°C - H-grade qualification ensures reliable operation in under-hood, avionic, and high-ambient industrial environments. |
| Current Sensing | RSENSE or inductor DCR - provides flexibility in accuracy vs. power loss trade-off; SENSE+/- inputs support differential sensing up to 65V common-mode. |
| Fault Timer Control | TMR pin with external capacitor - sets initial switching time (55ms/µF typ), retry period (50ms/µF), and cooldown (1700ms/µF). |
Pinout & Package
Package: 20-lead plastic TSSOP (FE package) with exposed pad (Pin 21 = GND). Requires soldering of exposed pad to PCB ground for rated thermal performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+, SENSE– | Differential current sense inputs | Set overcurrent trip threshold; tolerate up to 65V common-mode voltage; enable RSENSE or DCR sensing. |
| SS | Soft-start ramp control | Internal 10µA pull-up charges external capacitor; controls output voltage ramp rate during startup/retry. |
| VFB | Feedback voltage input | Regulates output by comparing against 0.792V–0.812V reference; used with resistor divider to set VOUT clamp. |
| ITH | Error amplifier output & compensation node | Controls current limit threshold; connects to RC network for loop stability in buck regulation mode. |
| TMR | Fault timer input | External capacitor sets switching duration limits and cooldown timing; critical for thermal management during surges. |
| WARNB | Open-drain fault warning output | Pulls low during switching (surge/overcurrent/startup) and shutdown; high-impedance 60µs after entering dropout. |
| TG, BG | Top and bottom gate drivers | Drive external N-MOSFETs; TG swings from SW to BOOST (floating high-side); BG swings from GND to DRVCC. |
| SW, BOOST | Switch node & bootstrapped supply | SW connects to inductor; BOOST supplies TG driver via external capacitor/diode; voltage ~DRVCC above SW. |
| VIN, DRVCC, EXTVCC | Main input, gate drive supply, external bias | VIN powers internal LDOs; DRVCC (6V/9V) drives gates; EXTVCC bypasses VIN LDO when >4.7V/7.7V (DRVUV-dependent). |
| RUN, OVLO, DRVUV | Enable, overvoltage lockout, DRVCC select | RUN <1.12V disables controller; OVLO >1.2V forces soft-start reset; DRVUV = GND/INTVCC selects DRVCC voltage and UVLO thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle pass-through mode | Minimizes conduction loss during normal operation-insertion loss dominated by external MOSFET RDS(on), not IC quiescent drop. |
| Programmable fault timer with cooldown | Enables aggressive thermal design for transient-only switching; external capacitor defines safe burst duration and automatic recovery. |
| Adjustable output voltage clamp | Configurable via standard resistor divider on VFB-no additional DAC or digital interface required for system-level voltage tailoring. |
| Dual gate drive with fast transitions | TG/BG drivers deliver <25ns rise/fall times into 3300pF; supports high-frequency, high-efficiency synchronous buck operation. |
| Flexible current sensing architecture | Supports precision shunt (RSENSE) or lossless inductor DCR sensing-reduces BOM count and improves efficiency in high-current designs. |
Applications
| Automotive Load Dump Protection | MIL-STD-1275 Vehicle Power Conditioning |
|---|---|
|
Use Scenario: Protecting infotainment ECUs and ADAS modules from 100V/400ms load dump transients on 28V vehicle buses. IC Role / Device Role / Timing Role: Pre-regulator clamping VOUT to 34V during surge; operates in 100% pass-through during normal cranking (12V–28V). Use Value: Enables use of standard 36V-rated downstream components instead of 100V+ rated parts-reducing cost and board area. |
Use Scenario: Ensuring uninterrupted operation of mission-critical avionics during 100V/500ms surges per MIL-STD-1275E Section 4.5.2. IC Role / Device Role / Timing Role: High-reliability surge stopper with H-grade (–40°C to 150°C) operation and programmable fault timer for controlled recovery. Use Value: Eliminates need for bulky linear regulators or uncontrolled crowbar circuits-maintains regulated output without thermal runaway. |
| Industrial DC Power Bus Protection | High-Voltage Telecom Backup Supply |
|
Use Scenario: Safeguarding PLC I/O modules and motor drives connected to 48V/72V industrial DC distribution networks subject to lightning-induced transients. IC Role / Device Role / Timing Role: Switching surge stopper with adjustable VOUT clamp (e.g., 52V) and RSENSE-based overcurrent limiting. Use Value: Delivers 20A continuous output during surges-far exceeding linear alternatives-while maintaining compact solution size. |
Use Scenario: Conditioning backup battery input (up to 140V) before feeding telecom rectifier modules requiring stable 54V input. IC Role / Device Role / Timing Role: High-efficiency pre-regulator operating in pass-through during nominal battery voltage, switching only during overvoltage faults. Use Value: Reduces power loss by >70% vs. linear solution during 100V surge-enabling smaller heatsinks and longer hold-up time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching surge stopper applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7862HUFD#PBF | Same silicon, QFN-20 (4mm × 5mm) package; θJA = 43°C/W vs. TSSOP's 38°C/W; exposed pad soldering mandatory. | Better thermal performance in space-constrained layouts; requires different PCB footprint and reflow profile. | Select for higher power density or improved thermal resistance where board area permits QFN mounting. |
| LTC4365IDDB#TRPBF | Linear surge protector (not switching); 60V abs max; fixed 3.3V/5V/12V outputs; no external MOSFETs required. | Limited to ≤3A output; unsuitable for 20A MIL-1275 or automotive load dump; simpler BOM but lower efficiency. | Choose only for low-current, cost-sensitive applications where 100% pass-through efficiency is not required. |
Compared with LTC7862HUFD#PBF, the LTC7862HFE#PBF offers superior thermal resistance in TSSOP form factor-critical for high-ambient industrial enclosures-while sharing identical electrical specs and H-grade temperature rating. Versus LTC4365, it delivers 6× higher output current and 3× lower power loss during surges, but requires external MOSFETs and more complex layout.
Availability
LTC7862HFE#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, MIL-STD-1275 vehicle power conditioning, and industrial DC bus surge suppression requiring stable component supply across extended temperature ranges.
Supply support for LTC7862HFE#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 aerospace markets.
The LTC7862HFE#PBF belongs to Analog Devices' Power by Linear™ surge protection controller family, engineered specifically for high-voltage transient resilience in mission-critical power systems where reliability, efficiency, and extended temperature operation are mandatory.
FAQ
What is the maximum input voltage the LTC7862HFE#PBF can withstand?
The LTC7862HFE#PBF has an absolute maximum input supply voltage (VIN) rating of 150V, with a specified operating range of 4V to 140V. This allows it to handle severe transients such as 100V/500ms MIL-STD-1275 surges and ISO 7637-2 load dump events while maintaining regulation and protecting downstream loads. Operation beyond 140V is outside guaranteed specifications.
How does the LTC7862HFE#PBF differ from the standard E-grade version?
The LTC7862HFE#PBF is qualified for operation from –40°C to 150°C junction temperature, whereas the E-grade (e.g., LTC7862EFE#PBF) is rated only to 125°C. This H-grade qualification ensures guaranteed performance in under-hood automotive, avionic, and high-ambient industrial environments where sustained elevated temperatures occur.
Can the LTC7862HFE#PBF operate without external MOSFETs?
No-the LTC7862HFE#PBF is a controller only and requires two external N-channel MOSFETs: one high-side (MTOP) and one synchronous low-side (MBOT). It provides gate drive signals (TG, BG), current sensing (SENSE+/–), and regulation logic-but no integrated power switches. Reference designs specify Infineon BSC035N10NS5 for both positions.
What is the purpose of the TMR pin on the LTC7862HFE#PBF?
The TMR pin on the LTC7862HFE#PBF accepts an external capacitor to define three timing intervals: (1) maximum allowed switching duration during overvoltage/overcurrent events (55ms/µF), (2) retry period after fault (50ms/µF), and (3) cooldown interval before restart (1700ms/µF). This prevents thermal runaway and enables component optimization for pass-through operation.
Does the LTC7862HFE#PBF support both RSENSE and DCR current sensing?
Yes-the LTC7862HFE#PBF supports both methods via its differential SENSE+ and SENSE– inputs. RSENSE provides high accuracy and simplicity; DCR sensing eliminates shunt power loss and is preferred in high-current, high-efficiency applications. The device tolerates up to 65V common-mode voltage on these pins, enabling direct connection to high-side or low-side sense points.
LTC7862HFE#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
LTC7862HFE#PBF FAQ
1.How can I place an order for LTC7862HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7862HFE#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 LTC7862HFE#PBF reliable?
The price and inventory of LTC7862HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7862HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7862HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7862HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7862HFE#PBF?
LTC7862HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7862HFE#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 LTC7862HFE#PBF?
For technical support, including LTC7862HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7862HFE#PBF requirements.
6.How does Aetrix verify that LTC7862HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7862HFE#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 LTC7862HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7862HFE#PBF?
All LTC7862HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7862HFE#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 LTC7862HFE#PBF part is unused and in its original packaging.
Return procedure for LTC7862HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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