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Analog Devices Inc. LTC7860EMSE#PBF
- Part No.:
- LTC7860EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7860EMSE#PBF.pdf
- Description:
- HIGH EFFICIENCY SWITCHING SURGE
- Quantity:
- Payment:
- Shipping:
Inventory:329
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Product details
Overview
LTC7860EMSE#PBF from Analog Devices is a high-efficiency switching surge stopper IC that protects downstream loads from input overvoltage transients (e.g., automotive load dump, MIL-STD-1275, ISO 7637) by regulating output voltage via external P-channel MOSFET control in PROTECTIVE PWM mode; supports 3.5V–60V input, adjustable 18V output clamp, 50kHz–850kHz programmable switching frequency, and 95mV current limit threshold with thermal fault timer.
For engineers reviewing the LTC7860EMSE#PBF datasheet, LTC7860EMSE#PBF pinout, LTC7860EMSE#PBF application, or LTC7860EMSE#PBF equivalent, key selection considerations include VIN range extension to 200V+, 100% duty-cycle SWITCH-ON mode for minimal insertion loss, adjustable fault timer for thermal safety, reverse battery protection capability, and MSOP-12 package with exposed PGND pad for industrial/automotive power systems.
Technical Context
The LTC7860EMSE#PBF implements peak current-mode control with transconductance error amplifier (1.8 mS), internal 0.8 V reference, and slope compensation to regulate output during transient events. It operates in two distinct modes: continuous conduction SWITCH-ON mode (no switching, <10 mΩ effective RDS(ON) path) and PROTECTIVE PWM mode (switching regulation at up to 850 kHz) triggered by overvoltage or overcurrent faults.
Its fault management relies on a dedicated TMR pin with programmable timing: 30 µA pull-up current charges CTMR until 1.29 V gate-off threshold is reached, then 1.3 µA pull-down current cools down to 240 mV restart threshold-enabling precise control of high-loss regulation duration. Gate drive uses an internal LDO generating (VIN – VCAP) = 8 V (typ.) for robust P-MOSFET turn-on, with UVLO active below 3.25 V (VIN – VCAP).
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; extendable to >200 V with external biasing |
| Output Clamp Voltage | Adjustable up to 18 V - set via resistor divider on VFB/VFBN; enables safe operation during 100 V/500 ms load dumps |
| Switching Frequency | 50 kHz to 850 kHz - programmed via FREQ pin resistor; allows EMI optimization and inductor size reduction |
| Current Limit Threshold | 95 mV (typ.) across RSENSE - sets peak inductor current limit; enables precise overcurrent protection independent of temperature |
| Fault Timer Set Time | 37–50 ms/µF - determined by TMR pin capacitor and internal 30 µA pull-up; limits high-power dissipation during surges |
| GATE Drive Supply | VIN – VCAP = 8.0 V (typ.) - internal LDO powers external P-MOSFET gate; ensures strong turn-on even at low VIN |
| Operating Temp Range | –40°C to 125°C - qualified for automotive under-hood and industrial environments per E-grade specification |
Pinout & Package
Package: 12-lead thermally enhanced MSOP with exposed PGND pad (Pin 13), requiring soldering to PCB for thermal performance (θJA = 40°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR (1) | Fault timer control node | Charged by 30 µA current during faults; triggers shutdown at 1.29 V and cool-down restart at 240 mV |
| FREQ (2) | Switching frequency programming input | Sets oscillator frequency via external resistor (50–850 kHz) or fixed 350/535 kHz when grounded/floated |
| SGND (3) | Signal ground reference | Reference for analog inputs (VFB, ITH, SS); must be connected to PGND at single point to avoid noise coupling |
| SS (4) | Soft-start and tracking input | Internal 10 µA current ramps external capacitor; regulates VFB to SS voltage during startup to limit inrush |
| VFB (5) | Feedback sense input | Regulated to 0.8 V (typ.); sets output voltage via resistor divider; folds back frequency if <0.4 V |
| ITH (6) | Error amplifier output & compensation node | 0–2.9 V range controls peak current limit; connects to external RC network for loop stability |
| VFBN (7) | Inverting feedback reference | Enables high-VIN (>60 V) operation via floating-ground topology; tied >2 V to disable inverting amp |
| RUN (8) | Enable/disable control | 1.26 V threshold; internal 0.4 µA pull-up allows direct connection to 60 V supply or logic-level signals |
| CAP (9) | GATE driver bias supply | Requires ≥0.47 µF ceramic cap to VIN; supplies 8 V gate drive for P-MOSFET; critical for stable switching |
| SENSE (10) | Current sense input | Measures differential voltage across RSENSE; 95 mV threshold enables accurate overcurrent detection |
| VIN (11) | Main power input | Supplies internal circuitry; requires ≥0.1 µF bypass cap to PGND; supports up to 65 V absolute max |
| GATE (12) | P-MOSFET gate driver output | Drives external high-side P-channel MOSFET; pull-up/down resistances of 2 Ω / 0.9 Ω ensure fast switching |
| PGND (13) | Power ground (exposed pad) | Must be soldered to PCB plane; carries high-current return path and provides primary thermal conduction path |
Key Features
| Feature | Design Value |
|---|---|
| PROTECTIVE PWM + SWITCH-ON dual-mode operation | Eliminates need for separate linear surge stopper; achieves <10 mΩ effective path loss in normal operation while enabling active clamping during transients |
| Programmable fault timer with cool-down recovery | Prevents thermal runaway by limiting high-dissipation PWM time; enables automatic retry after safe cooldown period |
| Adjustable output voltage clamp and overcurrent limit | Allows system-specific tuning of protection thresholds without changing IC - e.g., 18 V clamp for 28 V bus, 5 A limit for 60 W load |
| Reverse battery protection support | Enables addition of external PMOS between VIN and input capacitor to block reverse polarity without extra controller |
| High-voltage input extension (>200 V) | Supported via bootstrapped shunt regulator and VFBN-based feedback - maintains regulation integrity beyond 60 V VIN rating |
| Frequency foldback under short-circuit | Reduces minimum duty cycle when VFB < 0.4 V; prevents inductor saturation and limits peak current during startup or fault recovery |
Applications
| Automotive Load Dump Protection | Industrial 48 V DC Power Distribution |
|---|---|
Use Scenario: Protects infotainment ECUs and ADAS sensors from 120 V/400 ms ISO 7637-2 Pulse 5a load dump events on 12 V/24 V vehicle buses. IC Role / Device Role / Timing Role: Acts as high-efficiency pre-regulator controlling external P-MOSFET gate; switches only during surge to clamp VOUT at 18 V while maintaining 100% duty cycle otherwise. Use Value: Enables smaller heatsinks and higher sustained current (e.g., 10 A) vs. linear surge stoppers, reducing solution size by >40% and eliminating thermal derating at ambient 105°C. |
Use Scenario: Secures PLC I/O modules and motor drives against 60 V–100 V surges in factory automation systems powered from 48 V DC backbone. IC Role / Device Role / Timing Role: Functions as programmable input protector with adjustable 300 ms fault timer; regulates output during line transients while passing nominal voltage unaltered. Use Value: Delivers consistent 24 V output despite upstream voltage spikes, preventing brownouts and latch-up in sensitive digital controllers without sacrificing efficiency. |
| Telecom -48 V Backup Power Clamping | Military Vehicle Power (MIL-STD-1275E) |
Use Scenario: Maintains uninterrupted operation of base station radios during -48 V DC supply transients including +100 V surges and reverse polarity faults. IC Role / Device Role / Timing Role: Implements dual-path protection: SWITCH-ON mode for normal -48 V input, PROTECTIVE PWM for positive surges, plus optional reverse-battery PMOS. Use Value: Achieves >95% efficiency in steady state and clamps output to -42 V during +100 V events - meeting GR-1089-CORE immunity requirements with single-chip solution. |
Use Scenario: Ensures mission-critical avionics remain powered during 100 V/500 ms MIL-STD-1275E Class V surges on 28 V aircraft electrical systems. IC Role / Device Role / Timing Role: Serves as ruggedized front-end regulator with extended temp grade (–40°C to 125°C), TMR-cooled restart, and 200 V+ input capability via Zener biasing. Use Value: Guarantees no system reset or data loss during surge events; eliminates need for parallel TVS diodes and reduces BOM count by 3+ components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS#PBF | Linear surge stopper; no switching; fixed 18 V clamp; 3.5 V–34 V input; no programmable timer | Lower complexity, no inductor required; but limited to ≤3 A due to thermal constraints; unsuitable for >34 V input | Select when simplicity, zero EMI, and sub-3 A loads outweigh efficiency and voltage range needs. |
| TPS43060RTER | Wide-input buck controller (4.5 V–60 V); no integrated surge logic; requires external OV/OC monitoring and timer circuit | Higher design flexibility but adds 5+ discrete components; lacks built-in fault timer and PROTECTIVE PWM mode sequencing | Select when custom regulation profiles or multi-rail outputs are needed, and engineering resources exist for full control loop implementation. |
Compared with LTC4365IMS#PBF and TPS43060RTER, the LTC7860EMSE#PBF uniquely integrates programmable switching surge response, thermal-safe fault timing, and seamless 100% duty-cycle pass-through - delivering higher current capability, broader input range, and lower system-level component count in automotive and military power designs.
Availability
LTC7860EMSE#PBF is available at Aetrix Electronics and suitable for automotive electronics, industrial power distribution, and telecom infrastructure requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC7860EMSE#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 precision instrumentation, communications, and power management markets.
The LTC7860EMSE#PBF belongs to Analog Devices' Power by Linear™ surge protection product line, engineered specifically for high-reliability DC power systems where input transients, thermal safety, and compact footprint are critical design constraints.
FAQ
What is the maximum input voltage the LTC7860EMSE#PBF can handle in practice?
The LTC7860EMSE#PBF has an absolute maximum VIN rating of 65 V, but its operational input range is specified from 3.5 V to 60 V. With external bootstrapped biasing (e.g., Zener shunt regulator), the LTC7860EMSE#PBF supports reliable operation up to 200 V+ by isolating the IC's ground reference - confirmed in Analog Devices' Application Note DC2222 and Figure 1b/c schematics. This extension depends entirely on proper floating-ground implementation and component derating.
Does the LTC7860EMSE#PBF support reverse input voltage protection natively?
The LTC7860EMSE#PBF does not integrate reverse input voltage protection but explicitly supports it via an external PMOS placed between VIN and the input capacitor - as documented in the "Features" section and Figure 1a layout notes. The RUN pin's 60 V rating and internal 0.4 µA pull-up enable direct connection to the PMOS gate, allowing simple, low-component-count reverse-polarity blocking without additional drivers or controllers.
How does the fault timer in the LTC7860EMSE#PBF prevent thermal damage during prolonged surges?
The LTC7860EMSE#PBF's fault timer uses a dedicated TMR pin charged by a precise 30 µA current; when voltage reaches 1.29 V, the IC shuts down the GATE driver and initiates cool-down via 1.3 µA discharge to 240 mV. This hard-limits high-loss PROTECTIVE PWM mode duration - e.g., 44 ms per µF - ensuring thermal design can be optimized for normal operation while surviving short-duration surges per ISO 7637 or MIL-STD-1275E.
Can the LTC7860EMSE#PBF operate with a fixed 535 kHz switching frequency without external components?
Yes - the LTC7860EMSE#PBF achieves a fixed 535 kHz switching frequency when the FREQ pin is left floating (open), as stated in the "Electrical Characteristics" table and Pin Functions description. This eliminates the need for an external resistor and simplifies layout in noise-sensitive applications; alternatively, grounding FREQ selects 350 kHz, and a resistor sets frequencies from 50 kHz to 850 kHz.
What is the role of the VFBN pin on the LTC7860EMSE#PBF, and when must it be used?
The VFBN pin enables inverting feedback operation for input voltages above 60 V. When VIN exceeds 60 V, VFBN must be connected to a floating ground (e.g., Zener-biased node) to establish a local reference - allowing accurate output regulation without exposing the IC's internal circuitry to high common-mode voltage. For VIN ≤ 60 V, VFBN is tied >2 V (e.g., to FREQ or 3.3 V) to disable the inverting amplifier and use standard non-inverting feedback.
LTC7860EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Series:
- -
- Packaging:
- Tube
- 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
LTC7860EMSE#PBF FAQ
1.How can I place an order for LTC7860EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7860EMSE#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 LTC7860EMSE#PBF reliable?
The price and inventory of LTC7860EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7860EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7860EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7860EMSE#PBF transactions.
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4.How is shipping managed for LTC7860EMSE#PBF?
LTC7860EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7860EMSE#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 LTC7860EMSE#PBF?
For technical support, including LTC7860EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7860EMSE#PBF requirements.
6.How does Aetrix verify that LTC7860EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7860EMSE#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 LTC7860EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7860EMSE#PBF?
All LTC7860EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7860EMSE#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 LTC7860EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC7860EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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