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Analog Devices Inc. LTC7862EFE#PBF
- Part No.:
- LTC7862EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7862EFE#PBF.pdf
- Description:
- SURGE SUPP SWITCHING 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,716
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Product details
Overview
LTC7862EFE#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 RSENSE/DCR current sensing. Used in automotive load dump protection per ISO 7637 and MIL-STD-1275 compliant systems.
For engineers reviewing the LTC7862EFE#PBF datasheet, LTC7862EFE#PBF pinout, LTC7862EFE#PBF application, or LTC7862EFE#PBF equivalent, key selection criteria include its 4V–140V input range, 20-pin TSSOP package with exposed thermal pad, adjustable 50kHz–900kHz switching frequency, integrated gate drivers for dual N-channel MOSFETs, and fault-handling behavior including 2.7% retry duty cycle and open-drain WARNB indicator.
Technical Context
The LTC7862EFE#PBF implements a peak-current-mode synchronous buck controller architecture with fast comparator-based overcurrent limiting and programmable fault timing. Its dual-gate drivers (TG/BG) support external high-side and low-side N-MOSFETs, with BOOST charge pump enabling high-side drive during pass-through operation.
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/retry intervals using an external capacitor, enforcing strict thermal budgeting by limiting high-loss regulation time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V operating; 150V absolute max - supports wide industrial/automotive bus voltages including ISO 7637 load dump and MIL-STD-1275 transients. |
| Output Clamp Voltage | Adjustable up to 60V via feedback divider - sets safe regulated output during overvoltage events (e.g., clamped at 34V in typical 28V system). |
| Switching Frequency | 50kHz to 900kHz programmable via FREQ pin resistor - enables optimization of efficiency, size, and EMI across diverse power stages. |
| Current Sensing | RSENSE or inductor DCR sensing - provides accurate overcurrent protection without additional sense resistors in some topologies. |
| Fault Timer Control | TMR pin accepts external capacitor to set initial fault duration (55ms/µF typ), retry period (50ms/µF), and cooldown time (1700ms/µF) - enforces thermal safety during surge events. |
| Gate Driver Outputs | TG and BG drivers with 1.0Ω pull-down / 2.2Ω (TG) or 2.0Ω (BG) pull-up - delivers fast rise/fall times (≤25ns) into 3300pF loads for efficient MOSFET switching. |
| Operating Temperature | –40°C to +125°C junction - qualified for automotive and industrial environments requiring extended thermal reliability. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE) with exposed thermal pad (Pin 21 = GND). Requires soldering of exposed pad to PCB ground plane for rated electrical performance and θJA = 38°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+ | Differential current sense positive input | Connects to high-side of current sense resistor; used with SENSE– to set overcurrent trip threshold via ITH voltage. |
| SENSE– | Differential current sense negative input | Connects to low-side of current sense resistor or inductor DCR tap; powers current comparator when > INTVCC. |
| SS | Soft-start control input | Internal 10µA pull-up charges external capacitor to ramp VFB reference during startup or fault retry. |
| VFB | Feedback voltage input | Compares against 0.792V–0.812V internal reference to regulate output clamp voltage via external resistor divider. |
| ITH | Error amplifier output & compensation node | Sets current limit threshold; higher voltage increases current trip point in peak-current-mode control loop. |
| TMR | Fault timer programming input | External capacitor sets switching duration, cooldown, and retry timing; internal current sources define thresholds (2.19V switch-off, 0.25V retry). |
| FREQ | Oscillator frequency control | Resistor-to-GND sets frequency from 50–900kHz; tied to GND or INTVCC selects fixed 350kHz or 535kHz modes. |
| WARNB | Open-drain fault warning output | Pulls low during switching (overvoltage/overcurrent/startup), shutdown, or cooldown; high-impedance in dropout mode after 60µs delay. |
| TG | Top gate driver output | Floating high-side driver output referenced to SW; swings from SW to BOOST (≈VIN + DRVCC) to drive external high-side N-MOSFET. |
| SW | Switch node connection | Connects to inductor and source of bottom MOSFET; serves as return path for BOOST capacitor and TG driver reference. |
| OVLO | Overvoltage lockout input | Logic-high (>1.2V) disables switching while maintaining DRVCC/INTVCC regulation; connect to GND if unused. |
| INTVCC | Internal 5V LDO output | Powers internal analog/digital circuitry; requires 0.1µF ceramic bypass capacitor close to pin. |
| DRVCC | Gate driver supply output | Provides 6.0V (DRVUV = GND) or 9.0V (DRVUV = INTVCC) to TG/BG drivers; requires ≥4.7µF low-ESR ceramic decoupling. |
| VIN | Main input supply | Primary power input (4V–140V); supplies INTVCC LDO and DRVCC LDO unless EXTVCC is active. |
| EXTVCC | External gate driver supply input | Bypasses VIN-based DRVCC LDO when >4.7V/7.7V (DRVUV-dependent); must not exceed VIN or 14V. |
| RUN | Enable/disable control | <1.12V disables controller; <0.7V forces full shutdown (10µA IQ); tie to VIN for always-on operation. |
| DRVUV | DRVCC regulation & UVLO select | Configures DRVCC output (6V/9V) and selects lower/higher UVLO/EXTVCC switchover thresholds. |
| GND | Ground reference | All GND pins (including exposed pad Pin 21) must be connected to common system ground for functionality and thermal performance. |
| BG | Bottom gate driver output | Low-side driver referenced to GND; swings from 0V to DRVCC to drive synchronous N-MOSFET. |
| BOOST | High-side bootstrap supply | Capacitor between BOOST and SW provides floating supply for TG driver; diode from BOOST to DRVCC maintains charge. |
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 regulator inefficiency. |
| Adjustable output voltage clamp | Enables precise setting of safe output level (e.g., 28V or 34V) during transients without redesigning feedback network. |
| Programmable fault timer with cooldown | Prevents thermal runaway by strictly limiting cumulative switching time - allows use of smaller heatsinks optimized for pass-through mode. |
| Dual N-channel MOSFET support | Eliminates need for P-channel high-side switch or level-shifting - reduces BOM cost and improves efficiency with low-RDS(on) N-MOSFETs. |
| Open-drain WARNB indicator | Provides direct system-level fault signaling without external logic - simplifies monitoring of surge event status and recovery timing. |
| RSENSE or DCR current sensing | Offers flexibility in current measurement: discrete shunt for accuracy or inductor DCR for cost/size reduction in high-current designs. |
Applications
| Automotive Load Dump Protection | ISO 7637-2 Compliant Power Input |
|---|---|
|
Use Scenario: Vehicle battery system experiences 100V/400ms load dump transient during alternator disconnection. IC Role / Device Role / Timing Role: LTC7862EFE#PBF regulates output to 28V–34V clamp while switching, then reverts to 100% duty-cycle pass-through once transient ends. Use Value: Protects 28V-rated ECUs and infotainment modules without derating or oversized linear regulators - enables compact, high-current front-end protection. |
Use Scenario: Automotive module must survive repetitive ISO 7637-2 Pulse 5a (load dump) and Pulse 4 (cold crank) events on 12V/24V bus. IC Role / Device Role / Timing Role: LTC7862EFE#PBF acts as pre-regulator: passes nominal voltage directly, only switches during defined surge windows. Use Value: Achieves >95% efficiency in pass-through mode and >90% during regulation - eliminates thermal bottlenecks seen with linear surge stoppers. |
| MIL-STD-1275 Vehicle Power | Industrial DC Power Distribution |
|
Use Scenario: Military vehicle power system subjected to 100V/500ms surges per MIL-STD-1275E, Section 4.5.1. IC Role / Device Role / Timing Role: LTC7862EFE#PBF controls external MOSFETs to maintain stable 28V output during surge, with TMR limiting total switching time to prevent overheating. Use Value: Meets MIL-STD-1275E requirements with commercial-grade components - avoids costly hybrid or custom ASIC solutions. |
Use Scenario: Factory automation controller powered from unregulated 48V DC bus subject to lightning-induced transients and switching noise. IC Role / Device Role / Timing Role: LTC7862EFE#PBF clamps output to 36V during >48V spikes and limits inrush during hot-plug events via SS-controlled soft-start. Use Value: Enables robust, maintenance-free operation in harsh environments - eliminates field failures due to undervoltage brownouts or overvoltage damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching surge stopper applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS#PBF | Linear surge stopper IC with 65V abs max input; no switching, fixed 13.7V clamp; lower quiescent current (22µA) but limited to ~3A output. | Used where simplicity, ultra-low IQ, and small size outweigh current capability - e.g., sensor nodes or low-power modules. | Select LTC4365IMS#PBF only for sub-5A applications with tight IQ budgets and no need for adjustable clamp or high-current delivery. |
| TPS43060RTER | Wide-input synchronous buck controller (4.5V–60V), lacks integrated surge-specific features like programmable fault timer, WARNB, or 140V rating. | Requires external circuitry for overvoltage response and fault management - not drop-in for surge stopper function. | Choose TPS43060RTER only when designing custom surge protection with full control over timing, sequencing, and protection logic. |
Compared with LTC4365IMS#PBF and TPS43060RTER, the LTC7862EFE#PBF uniquely combines 140V input tolerance, programmable fault timing, dual-gate drive, and open-drain fault signaling - making it the only single-chip solution capable of protecting 20A loads against MIL-STD-1275 and ISO 7637 transients without external supervision.
Availability
LTC7862EFE#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, ISO 7637-2 compliant power inputs, and MIL-STD-1275 vehicle power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC7862EFE#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 LTC7862EFE#PBF belongs to Analog Devices' Power by Linear™ surge protection product line, engineered specifically for high-reliability DC power conditioning in harsh electromagnetic environments where input transients exceed standard regulator capabilities.
FAQ
What is the maximum input voltage the LTC7862EFE#PBF can withstand?
The LTC7862EFE#PBF has an absolute maximum input voltage rating of 150V, with guaranteed operation from 4V to 140V. This makes it suitable for demanding applications such as MIL-STD-1275E (100V/500ms) and ISO 7637-2 load dump (120V/400ms) protection. Exceeding 150V risks permanent damage, and operation above 140V falls outside specified performance limits.
How does the LTC7862EFE#PBF handle overcurrent conditions?
The LTC7862EFE#PBF uses a fast peak-current comparator with differential SENSE+ and SENSE– inputs to detect overcurrent. The trip threshold is set by the ITH voltage and sense element (RSENSE or DCR), allowing precise, adjustable current limiting. Upon detection, it enters switching mode to regulate output and activates the TMR timer - if the fault persists beyond the programmed duration, it initiates cooldown and retry cycles.
Can the LTC7862EFE#PBF operate without external MOSFETs?
No, the LTC7862EFE#PBF is a controller-only device and requires two external N-channel MOSFETs: one high-side (MTOP) and one synchronous low-side (MBOT). It provides dedicated gate drivers (TG and BG) and BOOST charge pump circuitry but contains no power switches. Omitting either MOSFET prevents proper regulation or pass-through operation.
What is the purpose of the WARNB pin on the LTC7862EFE#PBF?
The WARNB pin on the LTC7862EFE#PBF is an open-drain logic output that pulls low during all switching events - including input overvoltage, overcurrent, startup, and fault cooldown periods. It transitions to high-impedance 60µs after entering dropout mode (100% duty-cycle pass-through), providing unambiguous real-time status of surge activity to system monitoring circuitry.
Does the LTC7862EFE#PBF support both RSENSE and inductor DCR current sensing?
Yes, the LTC7862EFE#PBF supports both sensing methods. RSENSE uses a discrete shunt resistor between SENSE– and ground, while DCR sensing connects SENSE– to the inductor's DCR tap and SENSE+ to the output side. DCR sensing eliminates shunt losses but requires careful layout and temperature compensation; RSENSE offers higher accuracy and simpler implementation.
LTC7862EFE#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
LTC7862EFE#PBF FAQ
1.How can I place an order for LTC7862EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7862EFE#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 LTC7862EFE#PBF reliable?
The price and inventory of LTC7862EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7862EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7862EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7862EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7862EFE#PBF?
LTC7862EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7862EFE#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 LTC7862EFE#PBF?
For technical support, including LTC7862EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7862EFE#PBF requirements.
6.How does Aetrix verify that LTC7862EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7862EFE#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 LTC7862EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7862EFE#PBF?
All LTC7862EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7862EFE#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 LTC7862EFE#PBF part is unused and in its original packaging.
Return procedure for LTC7862EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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