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Analog Devices Inc. LTC7860IMSE#TRPBF
- Part No.:
- LTC7860IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7860IMSE#TRPBF.pdf
- Description:
- HIGH EFFICIENCY SWITCHING SURGE
- Quantity:
- Payment:
- Shipping:
Inventory:4,891
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Product details
Overview
LTC7860IMSE#TRPBF from Analog Devices is a high-efficiency switching surge stopper IC designed to protect downstream loads from input overvoltage transients (e.g., ISO 7637 load dumps, MIL-STD-1275 surges) while maintaining 100% duty-cycle conduction during normal operation. It controls an external P-channel MOSFET in PROTECTIVE PWM mode (50–850 kHz adjustable frequency), regulates output voltage clamping (adjustable via VFB/VFBN), limits output current (95 mV sense threshold), and features programmable fault timer (TMR pin) with 4.5% retry duty cycle. Used in automotive power distribution, telecom front-ends, and military vehicle systems.
For engineers reviewing the LTC7860IMSE#TRPBF datasheet, LTC7860IMSE#TRPBF pinout, LTC7860IMSE#TRPBF application, or LTC7860IMSE#TRPBF equivalent, key selection considerations include VIN range (3.5 V to 60 V), thermal rating (–40°C to 125°C junction), MSOP-12 package with exposed PGND pad, gate driver capability for high-side P-MOSFETs, and dual feedback options (inverting/non-inverting) for >60 V input designs.
Technical Context
The LTC7860IMSE#TRPBF implements peak current-mode control with transconductance error amplifier (1.8 mS), internal 0.8 V reference, and slope compensation. Its PROTECTIVE PWM mode uses real-time sensing of VIN–SENSE differential voltage to enforce 95 mV current limit and regulate VOUT during transients, while SWITCH-ON mode bypasses switching entirely by holding GATE high.
It integrates a programmable fault timer (TMR pin) with three-stage current sources (–30 µA pull-up, 40 µA pull-down reset, 1.3 µA cool-down), enabling precise control of maximum regulation duration. The gate driver provides 8 V bias (VIN–VCAP) with 2 Ω pull-up / 0.9 Ω pull-down strength, optimized for fast turn-on/turn-off of external P-MOSFETs in high-voltage surge scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Operating Range | 3.5 V to 60 V - supports 12 V/24 V/48 V vehicle and telecom buses; external components extend to 200 V+ |
| Switching Frequency | 50 kHz to 850 kHz - adjustable via FREQ pin resistor; enables EMI optimization and inductor size reduction |
| Current Limit Threshold | 95 mV (typ) across RSENSE - sets precise peak current limit without external op-amps |
| Feedback Reference Voltage | 0.800 V (±1.1%) - stable reference for accurate VOUT clamp programming via resistor divider |
| Fault Timer Set Time | 37–50 ms per µF on TMR pin - ensures thermal safety by limiting high-loss PWM duration during sustained surges |
| Operating Junction Temp | –40°C to 125°C - qualified for automotive under-hood and industrial control environments |
| Package Thermal Resistance | θJA = 40°C/W, θJC = 10°C/W - exposed PGND pad enables efficient heat dissipation in compact layouts |
Pinout & Package
12-lead thermally enhanced MSOP package with exposed PGND pad (Pin 13), requiring soldering to PCB for electrical continuity and thermal performance. Pin 13 must be connected to system power ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR (1) | Fault timer control node | Monitors time in PROTECTIVE PWM mode; 30 µA pull-up initiates shutdown at 1.29 V; 1.3 µA pull-down enables cool-down restart |
| FREQ (2) | Switching frequency setpoint | 20 µA current source develops voltage across RFREQ; grounding = 350 kHz, floating = 535 kHz, resistor = 50–850 kHz |
| SGND (3) | Analog signal ground reference | Isolated ground for VFB, ITH, SS, VFBN; must connect to PGND at single point to avoid noise coupling |
| SS (4) | Soft-start and tracking input | Internal 10 µA current charges external capacitor; regulates VFB to smaller of 0.8 V or SS voltage for controlled VOUT ramp |
| VFB (5) | Output feedback sense | Regulated to 0.8 V reference; connects to resistor divider for VOUT clamp setting; foldback activates below 0.4 V |
| ITH (6) | Error amplifier output & compensation | 0–2.9 V range sets peak inductor current; used for loop compensation with external R/C network |
| VFBN (7) | Inverting feedback input | Enables high-VIN (>60 V) operation via external transistor-based feedback; tie >2 V to disable inverting mode |
| RUN (8) | Enable/disable control | 1.26 V threshold; internal 0.4 µA pull-up allows direct connection to up to 60 V supply |
| CAP (9) | GATE driver bias supply | Regulated LDO output (VIN–VCAP ≈ 8 V); requires ≥0.47 µF ceramic cap between VIN and CAP for stability |
| SENSE (10) | Current sense input | Kelvin-connected to RSENSE; compares VIN–SENSE differential to 95 mV threshold for overcurrent protection |
| VIN (11) | Main power input | Supplies internal circuitry; requires ≥0.1 µF ceramic bypass to PGND; UVLO triggers below 3.25 V (VIN–VCAP) |
| GATE (12) | P-MOSFET gate drive output | Drives external high-side P-channel MOSFET; 2 Ω pull-up / 0.9 Ω pull-down ensures fast switching transitions |
| PGND (13) | Power ground reference | Exposed pad; must be soldered to PCB copper for thermal management and low-impedance return path |
Key Features
| Feature | Design Value |
|---|---|
| PROTECTIVE PWM + SWITCH-ON dual-mode operation | Eliminates need for separate linear surge stopper and pass-through switch; reduces BOM count and board area |
| Adjustable output voltage clamp | Programmable via VFB/VFBN resistor networks - supports both ≤60 V and >60 V input configurations with accuracy trade-offs |
| Programmable fault timer with cool-down recovery | Prevents thermal runaway during sustained overvoltage; 4.5% retry duty cycle ensures safe intermittent operation |
| Integrated gate driver with regulated VCAP | Delivers 8 V gate bias referenced to VIN - enables robust drive of P-MOSFETs without external charge pump |
| Frequency foldback under short-circuit | Reduces minimum on-time and switching losses during start-up or output faults - improves reliability in harsh conditions |
| Reverse battery protection support | Allows optional PMOS addition at input - extends protection coverage to reverse polarity events per ISO 16750-2 |
Applications
| Automotive Load Dump Protection | Telecom DC Power Front-End |
|---|---|
|
Use Scenario: Vehicle 12 V/24 V bus subjected to ISO 7637-2 Pulse 5a (load dump up to 60 V, 400 ms). IC Role / Device Role / Timing Role: LTC7860IMSE#TRPBF acts as pre-regulator controlling external P-MOSFET to clamp VOUT at 13.8 V during surge, then switches to 100% duty cycle post-surge. Use Value: Prevents damage to infotainment, ADAS, and body control modules without derating downstream converters. |
Use Scenario: 48 V telecom rectifier output feeding sensitive base station equipment with strict 58 V max input requirement. IC Role / Device Role / Timing Role: LTC7860IMSE#TRPBF monitors input and engages PROTECTIVE PWM only during line surges exceeding 58 V, maintaining nominal efficiency otherwise. Use Value: Enables use of lower-cost 58 V-rated downstream DC/DCs instead of 100 V+ rated parts, reducing system cost and footprint. |
| MIL-STD-1275 Vehicle Power | Industrial Equipment Input Protection |
|
Use Scenario: Military ground vehicle power system experiencing MIL-STD-1275B transient (100 V, 500 ms). IC Role / Device Role / Timing Role: LTC7860IMSE#TRPBF regulates VOUT to 28 V using external P-MOSFET and inductor, with TMR limiting PWM time to 100 ms to prevent MOSFET overheating. Use Value: Meets MIL-STD-461E CS115 requirements while enabling compact thermal design due to limited high-loss duration. |
Use Scenario: Programmable logic controller (PLC) powered from unregulated 24 V industrial supply with frequent motor-switching-induced spikes. IC Role / Device Role / Timing Role: LTC7860IMSE#TRPBF clamps VOUT to 24.5 V during transients and provides soft-start via SS pin to limit inrush into downstream SMPS. Use Value: Eliminates need for TVS diodes and bulk capacitance, improving long-term reliability and reducing maintenance downtime. |
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; no inductor required; 45 V max VIN; fixed 5.8 V clamp; no adjustable timer | Better for low-current (<3 A), space-constrained designs where efficiency is secondary to simplicity | Select LTC4365IMS#PBF when input surges are infrequent and thermal budget prohibits inductor use. |
| MAX6495ATA+T | Switching surge stopper; 75 V max VIN; fixed 12 V clamp; no VOUT adjustability; 100 ms fixed timer | Suitable for fixed-rail 12 V systems with predictable surge profiles but less flexible for custom clamp voltages | Select MAX6495ATA+T when standardized 12 V output and simplified layout outweigh need for programmability. |
Compared with LTC4365IMS#PBF and MAX6495ATA+T, the LTC7860IMSE#TRPBF offers full VOUT adjustability, wide VIN range (3.5–60 V), and precise timer control - making it optimal for high-current, multi-rail, and thermally constrained surge protection where design flexibility and efficiency are critical.
Availability
LTC7860IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive power distribution, telecom front-end protection, and military vehicle systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC7860IMSE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC7860IMSE#TRPBF belongs to Analog Devices' Power by Linear™ surge protection product line, engineered specifically for high-efficiency transient suppression in demanding vehicular, aerospace, and infrastructure power systems.
FAQ
What is the maximum input voltage the LTC7860IMSE#TRPBF can handle?
The LTC7860IMSE#TRPBF has an absolute maximum VIN rating of 65 V and operates continuously from 3.5 V to 60 V. With external components-including a bootstrapped shunt regulator and inverting feedback-its effective input voltage range extends reliably beyond 200 V, as confirmed in the Applications Information section of the datasheet.
Does the LTC7860IMSE#TRPBF require an inductor in all operating modes?
Yes, the LTC7860IMSE#TRPBF requires an external inductor for PROTECTIVE PWM mode operation during overvoltage or overcurrent events. However, during normal SWITCH-ON mode (100% duty cycle), the inductor functions as a low-impedance conductor with minimal AC voltage drop-no switching occurs, so core losses are negligible and the inductor does not affect steady-state efficiency.
How is output voltage clamping configured on the LTC7860IMSE#TRPBF?
Output voltage clamping on the LTC7860IMSE#TRPBF is configured using a resistor divider from VOUT to VFB (for ≤60 V VIN) or to VFBN (for >60 V VIN). For standard operation, VOUT = 0.8 V × (1 + RFB1/RFB2). In high-VIN configurations, inverting feedback adds transistor QFB and resistors RFB3/RFB4 to translate VOUT into a differential signal referenced to floating ground.
Can the LTC7860IMSE#TRPBF support reverse input voltage protection?
Yes, the LTC7860IMSE#TRPBF supports reverse input voltage protection through an optional external PMOS placed at the input. When reverse polarity is applied, the PMOS remains off, blocking current flow. This configuration is explicitly described in the Features and Applications sections of the datasheet and complements the device's primary overvoltage and overcurrent protection functions.
What is the purpose of the TMR pin on the LTC7860IMSE#TRPBF?
The TMR pin on the LTC7860IMSE#TRPBF implements a programmable fault timer that strictly limits the duration of PROTECTIVE PWM mode. During overvoltage or overcurrent events, a –30 µA current charges an external capacitor on TMR; when voltage reaches 1.29 V, the gate driver shuts off. A 1.3 µA discharge current then cools down the system before automatic restart, preventing thermal damage during sustained faults.
LTC7860IMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- General Purpose
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC7860IMSE#TRPBF FAQ
1.How can I place an order for LTC7860IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7860IMSE#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 LTC7860IMSE#TRPBF reliable?
The price and inventory of LTC7860IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7860IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7860IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7860IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7860IMSE#TRPBF?
LTC7860IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7860IMSE#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 LTC7860IMSE#TRPBF?
For technical support, including LTC7860IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7860IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC7860IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7860IMSE#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 LTC7860IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7860IMSE#TRPBF?
All LTC7860IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7860IMSE#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 LTC7860IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7860IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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