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Analog Devices Inc. LTC7860HMSE#PBF
- Part No.:
- LTC7860HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7860HMSE#PBF.pdf
- Description:
- HIGH EFFICIENCY SWITCHING SURGE
- Quantity:
- Payment:
- Shipping:
Inventory:114
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Product details
Overview
LTC7860HMSE#PBF from Analog Devices is a high-efficiency switching surge stopper IC designed to protect downstream loads from automotive load dumps, ISO 7637 transients, and MIL-STD-1275 surges. It controls an external P-channel MOSFET in two modes: 100% duty-cycle SWITCH-ON for normal operation (VIN = 3.5V–60V), and PROTECTIVE PWM mode during overvoltage events (e.g., 60V input clamped to 18V output). Key confirmed parameters include adjustable output voltage clamp (via VFB divider), 50kHz–850kHz programmable switching frequency, –40°C to +150°C operating junction temperature, and integrated fault timer with 4.5% retry duty cycle.
For engineers reviewing the LTC7860HMSE#PBF datasheet, LTC7860HMSE#PBF pinout, LTC7860HMSE#PBF application, or LTC7860HMSE#PBF equivalent, this page delivers verified technical context on its dual-mode gate control architecture, thermal-rated MSOP-12 package, current-sense-based overcurrent protection, and precise fault timing behavior - all critical for automotive power rail hardening and telecom front-end design.
Technical Context
The LTC7860HMSE#PBF implements peak current-mode control with a transconductance error amplifier (gm = 1.8 mS) and internal 0.800 V feedback reference (±0.9% tolerance). Its dual operational modes are governed by real-time comparison of VIN–SENSE voltage against 95 mV current limit threshold and VFB against 0.8 V reference - triggering seamless transition between lossless SWITCH-ON and regulated PROTECTIVE PWM.
Fault response is managed by a dedicated TMR pin circuit: a 30 µA pull-up current charges CTMR until reaching 1.29 V (VGTH), forcing shutdown; then a 1.3 µA pull-down current cools TMR to 240 mV (VRTH) before restart. This ensures strict thermal budgeting - limiting high-loss PWM time to ≤50 ms per fault event at typical conditions - enabling compact thermal design optimized for nominal 12 V/28 V bus operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.5 V to 60 V - supports 12 V/24 V/28 V vehicle buses and industrial supplies; external components extend input to ≥200 V. |
| Output Clamp Accuracy | 0.791 V to 0.809 V (VFB regulation) - enables ±1.1% output voltage accuracy with precision resistor dividers. |
| Switching Frequency | 50 kHz to 850 kHz (programmable via FREQ pin resistor) - allows EMI optimization and inductor size reduction across wide load ranges. |
| Current Limit Threshold | 95 mV (typical) across SENSE resistor - sets precise overcurrent trip point independent of temperature (±2.5% over –40°C to +150°C). |
| Fault Timer Set Time | 37–50 ms/µF (TSETI) - defines maximum safe duration in PROTECTIVE PWM mode before forced shutdown and cool-down. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive and harsh-environment industrial use; θJC = 10°C/W. |
| Gate Driver Capability | 8.0 V (typical) VCAP bias - ensures robust turn-on of high-threshold P-MOSFETs; RUP = 2 Ω, RDN = 0.9 Ω for fast edge control. |
Pinout & Package
Package: 12-lead thermally enhanced MSOP with exposed PGND pad (Pin 13), rated for TJMAX = 150°C and θJA = 40°C/W. Exposed pad must be soldered to PCB for electrical continuity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR (1) | Fault timer control node | Charged by 30 µA pull-up; triggers shutdown at 1.29 V; pulled down to 240 mV for cool-down before restart. |
| FREQ (2) | Switching frequency programming input | Accepts resistor-to-GND (50–850 kHz) or DC voltage; grounded = 350 kHz, floating = 535 kHz. |
| SGND (3) | Signal ground reference | Isolated analog ground for VFB, ITH, SS; 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 ramp-up. |
| VFB (5) | Feedback sense input | Regulated to 0.800 V ±0.9%; used with resistor divider to set output clamp voltage; folds frequency below 0.4 V. |
| ITH (6) | Error amplifier output & compensation node | 0–2.9 V range; sets peak inductor current threshold; connects to external RC network for loop stability. |
| VFBN (7) | Inverting feedback reference | 0 V threshold; enables high-VIN (>60 V) applications via floating-ground topology; tie >2 V to disable. |
| RUN (8) | Enable/disable control | 1.26 V threshold (150 mV hysteresis); internal 0.4 µA pull-up; accepts up to 60 V external logic. |
| CAP (9) | GATE driver bias supply | Regulated to VIN–8 V; requires ≥0.47 µF low-ESR ceramic cap between VIN and CAP for stable gate drive. |
| SENSE (10) | Current sense differential input | Measures VIN–SENSE voltage; trips at 95 mV to limit output current; requires Kelvin connection for accuracy. |
| VIN (11) | Main power input | Supplies internal circuitry; requires ≥0.1 µF bypass cap to PGND; UVLO activates below 3.25 V (VIN–VCAP). |
| GATE (12) | P-MOSFET gate driver output | Drives external high-side P-channel MOSFET; operates only when VIN–VCAP ≥3.25 V; disabled in UVLO. |
| PGND (13) | Power ground (exposed pad) | Reference for GATE, SENSE, VIN; must be soldered to PCB plane for thermal conduction 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 switch; achieves <10 mΩ effective insertion loss in normal mode while delivering full transient suppression. |
| Programmable fault timer with auto-retry | Enables safe, self-resetting protection: limits high-power PWM time to prevent thermal runaway, then resumes after fixed cool-down period (TRSTC = 732 ms/µF). |
| Adjustable output voltage clamp | Supports precise output regulation (e.g., 12 V, 18 V, 24 V) using standard resistor dividers without external op-amps or references. |
| High-accuracy current limiting | 95 mV ±2.5% sense threshold ensures consistent overcurrent protection across –40°C to +150°C, eliminating derating margins. |
| Reverse battery protection ready | Supports optional PMOS addition at input without redesign; VFBN and RUN pins tolerate reverse polarity when properly biased. |
| EMI-optimized soft-start & frequency foldback | SS pin controls inrush current ramp; VFB foldback reduces min-duty-cycle stress during short-circuit recovery, improving reliability. |
Applications
| Automotive Load Dump Protection | Industrial 24 V/48 V Power Rail Hardening |
|---|---|
|
Use Scenario: Protecting infotainment ECUs and ADAS sensors from 12 V system load dump transients (ISO 7637-2 Pulse 5a, up to 60 V/400 ms). IC Role / Device Role / Timing Role: Acts as pre-regulator controlling external P-MOSFET gate to clamp VOUT to 13.5 V during surge, maintaining uninterrupted operation. Use Value: Enables direct replacement of linear surge stoppers with 5× higher current capability (e.g., 10 A vs. 2 A) and 75% smaller solution size due to switching efficiency. |
Use Scenario: Securing PLC I/O modules and motor drives against 24 V/48 V bus surges caused by relay switching or lightning-induced spikes. IC Role / Device Role / Timing Role: Provides active overvoltage clamping and overcurrent limiting in SWITCH-ON mode, with automatic fault recovery via TMR timer. Use Value: Eliminates need for TVS diodes and fuses in front-end protection, reducing BOM count and improving long-term reliability under repeated surge stress. |
| Telecom DC Power Distribution | Military Vehicle Power (MIL-STD-1275) |
|
Use Scenario: Regulating -48 V telecom rectifier outputs to protect base station radios from input transients and brownouts. IC Role / Device Role / Timing Role: Functions as high-efficiency DC/DC pre-regulator in PROTECTIVE PWM mode during line faults, maintaining stable 3.3 V/5 V/12 V rails. Use Value: Delivers >92% efficiency at full load (vs. <65% for linear solutions), reducing heat sink requirements and enabling fanless enclosure designs. |
Use Scenario: Hardening avionics and vehicle computing systems against MIL-STD-1275B Class A/B/C surges (up to 100 V/500 ms) in tactical vehicles. IC Role / Device Role / Timing Role: Controls external MOSFET to maintain VOUT ≤34 V during engine cranking and load dump events, with guaranteed operation to +150°C. Use Value: Meets extended temperature qualification (H-grade) and provides deterministic fault response - no latch-up or undefined states during extreme transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency surge stopper applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS#PBF | Linear surge stopper; fixed 18 V clamp; no switching, no external MOSFET required; max 3 A continuous. | Lower complexity, lower cost, but limited to ≤3 A and >5× higher power loss during surges. | Select when output current ≤3 A and thermal budget permits linear dissipation; not suitable for high-current automotive ECUs. |
| TPS43060RTER | Integrated synchronous buck controller (no built-in surge logic); requires external comparator/timer for overvoltage response. | Greater flexibility in topology (buck, boost, SEPIC), but demands custom fault management circuitry and layout effort. | Select when designing multi-rail converters where surge protection is one function among many; adds design risk and validation time. |
Compared with LTC4365IMS#PBF, the LTC7860HMSE#PBF delivers 5× higher current capability and 75% lower thermal stress during surges; compared with TPS43060RTER, it integrates complete surge logic and timing - reducing component count by ≥8 parts and eliminating custom fault-response firmware or analog circuits.
Availability
LTC7860HMSE#PBF is available at Aetrix Electronics and suitable for automotive electronics, industrial power distribution, and military vehicle systems requiring stable component supply with extended temperature support and long lifecycle assurance.
Supply support for LTC7860HMSE#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 LTC7860HMSE#PBF belongs to Analog Devices' Power by Linear™ surge protection product line, engineered specifically for high-reliability DC power rail hardening in automotive, aerospace, and industrial environments where transient immunity and thermal resilience are non-negotiable.
FAQ
What is the maximum input voltage the LTC7860HMSE#PBF can handle?
The LTC7860HMSE#PBF 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 floating-ground feedback - the input voltage can be reliably extended to 200 V or higher, as confirmed in the Applications Information section of the datasheet. The device itself does not regulate above 60 V directly; instead, it interfaces safely with high-voltage domains through isolated feedback paths.
Does the LTC7860HMSE#PBF require an external MOSFET, and what type is supported?
Yes, the LTC7860HMSE#PBF requires an external P-channel MOSFET connected between VIN and VOUT, controlled via its GATE pin. It is explicitly designed for high-side P-MOSFET configurations and provides an 8 V gate bias (VIN–VCAP) to ensure full enhancement. The datasheet confirms compatibility with standard logic-level and standard-threshold P-MOSFETs, and notes that an optional N-channel MOSFET with level-shifting may be used for reverse battery protection.
How does the fault timer in the LTC7860HMSE#PBF work during sustained overvoltage events?
The LTC7860HMSE#PBF uses the TMR pin to implement a two-phase fault timer: during overvoltage or overcurrent, a 30 µA current charges CTMR until it reaches 1.29 V (VGTH), forcing shutdown; then a 1.3 µA current discharges TMR to 240 mV (VRTH) during cool-down. The restart duty cycle is fixed at 4.5%, meaning the device remains off for ~22× longer than it is on during sustained faults - preventing thermal runaway while enabling autonomous recovery without external intervention.
Can the LTC7860HMSE#PBF be used for output overcurrent protection only, without overvoltage clamping?
Yes, the LTC7860HMSE#PBF supports standalone overcurrent protection. In normal SWITCH-ON mode, it continuously monitors VIN–SENSE voltage; if the sensed voltage exceeds the 95 mV threshold (set by RSENSE), it enters PROTECTIVE PWM mode to limit output current - even with stable input voltage. This behavior is independent of VFB configuration, making it suitable for applications like motor start-up current limiting or hot-swap inrush control where overvoltage is not a concern.
What is the significance of the H-grade temperature rating for the LTC7860HMSE#PBF?
The "H" in LTC7860HMSE#PBF denotes the high-reliability temperature grade, guaranteeing full electrical performance from –40°C to +150°C junction temperature. Unlike commercial (E) or industrial (I) grades, the H-grade undergoes additional screening and characterization across the full range, with validated thermal resistance (θJC = 10°C/W) and guaranteed operation under sustained high-temperature stress - essential for under-hood automotive, engine control, and military vehicle deployments where ambient temperatures exceed 105°C.
LTC7860HMSE#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
LTC7860HMSE#PBF FAQ
1.How can I place an order for LTC7860HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7860HMSE#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 LTC7860HMSE#PBF reliable?
The price and inventory of LTC7860HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7860HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7860HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7860HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7860HMSE#PBF?
LTC7860HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7860HMSE#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 LTC7860HMSE#PBF?
For technical support, including LTC7860HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7860HMSE#PBF requirements.
6.How does Aetrix verify that LTC7860HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7860HMSE#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 LTC7860HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7860HMSE#PBF?
All LTC7860HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7860HMSE#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 LTC7860HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC7860HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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