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Analog Devices Inc. LTC7860MPMSE#TRPBF
- Part No.:
- LTC7860MPMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7860MPMSE#TRPBF.pdf
- Description:
- HIGH EFFICIENCY SWITCHING SURGE
- Quantity:
- Payment:
- Shipping:
Inventory:4,150
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Product details
Overview
LTC7860MPMSE#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 dump, MIL-STD-1275 surges) and overcurrent faults. It controls an external P-channel MOSFET in two modes: 100% duty-cycle SWITCH-ON mode for normal operation (VIN = 3.5V–60V), and PROTECTIVE PWM mode during faults, clamping VOUT to a user-adjustable safe level (e.g., 18V). Key confirmed parameters include –55°C to 150°C operating junction temperature, 50kHz–850kHz programmable switching frequency, 95mV current limit threshold, 0.8V feedback reference, and 12-lead MSOP package with exposed PGND pad.
For engineers reviewing the LTC7860MPMSE#TRPBF datasheet, LTC7860MPMSE#TRPBF pinout, LTC7860MPMSE#TRPBF application, or LTC7860MPMSE#TRPBF equivalent, this page delivers verified functional role (high-voltage transient protection controller), thermal grade (–55°C to 150°C), fault timer behavior (programmable via TMR pin), gate driver specs (8V VCAP bias, 0.9Ω pull-down), and real-world use cases in automotive, military, and telecom power systems.
Technical Context
The LTC7860MPMSE#TRPBF implements peak current-mode control with a transconductance error amplifier (gm = 1.8 mS) and internal 0.8V reference. Its dual-mode operation-SWITCH-ON (dropout) and PROTECTIVE PWM-is governed by VIN-VSENSE comparison against 95mV threshold and VFB regulation logic. The fault timer (TMR pin) uses three distinct currents (–30µA pull-up, 40µA pull-down reset, 1.3µA cool-down) to enforce strict time-limited regulation during surges.
It features a dedicated gate driver with regulated VCAP supply (VIN–VCAP = 8V typical), low-RDS(on) drive capability (RUP = 2Ω, RDN = 0.9Ω), and UVLO activation at VIN–VCAP < 3.25V. Frequency is set via FREQ pin (ground = 350kHz, open = 535kHz, resistor-programmable 50–850kHz), and foldback reduces switching frequency to ~18% of setpoint when VFB < 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.5V to 60V - supports standard automotive and industrial rails; external components extend input to 200V+. |
| Operating Temp | –55°C to 150°C - fully tested extended temperature grade for military and harsh-environment applications. |
| Switching Freq | 50kHz to 850kHz - programmable via external resistor on FREQ pin; enables EMI optimization and size/efficiency trade-offs. |
| Current Limit | 95mV sense threshold - sets peak inductor current as IOUT(MAX) = 95mV / RSENSE; ensures precise overcurrent protection. |
| Feedback Ref | 0.800V ±0.009V - tight tolerance reference used to regulate VOUT via resistor divider; enables accurate output voltage programming. |
| Gate Drive | 8V VCAP bias, 0.9Ω pull-down - drives external P-MOSFET with low loss and fast turn-off; critical for efficient PROTECTIVE PWM mode. |
| Fault Timer | Programmable via TMR capacitor - sets maximum time in high-loss PWM mode (e.g., 100ms with 22µF); prevents thermal runaway during sustained surges. |
Pinout & Package
Package: 12-lead plastic MSOP with exposed PGND pad (Pin 13), thermally enhanced for –55°C to 150°C operation. Exposed pad must be soldered to PCB for electrical continuity and thermal performance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR (1) | Fault timer control node | Monitors time in PROTECTIVE PWM mode; 30µA pull-up charges capacitor until 1.29V gate-off threshold triggers shutdown. |
| FREQ (2) | Switching frequency programming input | 20µA current source sets oscillator frequency via external resistor; ground = 350kHz, open = 535kHz, resistor = 50–850kHz. |
| SGND (3) | Signal ground reference | Common return for analog inputs (VFB, ITH, SS); must connect to PGND at single point to avoid noise coupling. |
| SS (4) | Soft-start and tracking input | Internal 10µA current charges external capacitor; regulates VFB to smaller of 0.8V or SS voltage for controlled VOUT ramp. |
| VFB (5) | Output voltage feedback sense | Connected to resistor divider; LTC7860 regulates VFB to 0.8V, setting VOUT = 0.8V × (1 + R1/R2) in non-inverting configuration. |
| ITH (6) | Error amplifier output & compensation node | Carries transconductance amplifier output (0–2.9V); used for loop compensation and current limit threshold setting. |
| VFBN (7) | Inverting feedback input | Enables high-voltage (>60V) operation via floating-ground feedback; tied >2V to disable inverting amp for standard configurations. |
| RUN (8) | Enable/disable control | 1.26V threshold enables operation; internal 0.4µA pull-up allows direct connection to up to 60V supply for robust enable signaling. |
| CAP (9) | GATE driver bias supply | Regulated 8V below VIN; requires ≥0.47µF ceramic capacitor between VIN and CAP for stable gate drive under surge conditions. |
| SENSE (10) | Current sense input | Kelvin-connected to sense resistor; differential voltage (VIN–SENSE) compared to 95mV threshold for overcurrent protection. |
| VIN (11) | Main power supply input | Supplies internal circuitry; requires ≥0.1µF bypass capacitor to PGND; UVLO activates if VIN–VCAP < 3.25V. |
| GATE (12) | External P-MOSFET gate driver output | Drives gate with low-impedance push-pull; operates only when VIN–VCAP ≥ 3.5V; disables during UVLO or shutdown. |
| PGND (13) | Power ground (exposed pad) | Primary return path for high-current paths (MOSFET source, SENSE, CAP); must be soldered to PCB plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| PROTECTIVE PWM Mode | Actively regulates output during input surges (e.g., 60V → 18V clamp), enabling uninterrupted load operation without linear dissipation losses. |
| SWITCH-ON Mode | 100% duty cycle conduction minimizes insertion loss (RDS(on)-dominated), delivering near-zero dropout voltage in normal operation. |
| Programmable Fault Timer | Adjustable cool-down and retry timing (e.g., 4.5% duty cycle during sustained fault) prevents thermal damage while allowing recovery after surge events. |
| Reverse Battery Protection Ready | Supports optional external PMOS on input side; complements surge protection for full automotive battery polarity reversal compliance. |
| High-Voltage Scalability | Input extended beyond 60V (to 200V+) using bootstrapped shunt regulator and inverting/non-inverting feedback options - no internal voltage rating limitation. |
Applications
| Automotive Load Dump Protection | ISO 7637-2 Compliant Power Supply |
|---|---|
|
Use Scenario: Vehicle electrical system experiences 120V/100ms load dump transient on 12V battery rail. IC Role / Device Role / Timing Role: LTC7860MPMSE#TRPBF acts as pre-regulator, switching external P-MOSFET to clamp VOUT to 18V during surge while maintaining 100% conduction otherwise. Use Value: Prevents damage to 24V-rated ECUs and infotainment modules; eliminates need for bulky TVS diodes or inefficient linear regulators. |
Use Scenario: Industrial vehicle control unit requires immunity to ISO 7637-2 Pulse 5a (load dump) and Pulse 4 (alternator ripple). IC Role / Device Role / Timing Role: LTC7860MPMSE#TRPBF provides time-limited PROTECTIVE PWM regulation with adjustable TMR capacitor, ensuring safe operation within ISO-defined surge durations. Use Value: Meets automotive EMC requirements without derating or oversized heatsinks; supports compact, convection-cooled designs. |
| MIL-STD-1275E Transient Suppression | Telecom DC Power Input Protection |
|
Use Scenario: Military radio subsystem powered from 28V bus subjected to MIL-STD-1275E Class A/B surges (up to 100V, 500ms). IC Role / Device Role / Timing Role: LTC7860MPMSE#TRPBF operates in PROTECTIVE PWM mode to hold VOUT ≤ 34V, then auto-restarts after TMR cool-down period. Use Value: Enables reliable operation across extreme temperature range (–55°C to 150°C); avoids single-point failure of linear solutions under prolonged surges. |
Use Scenario: Telecom base station power module receives unregulated –48V DC input with potential for reverse polarity or lightning-induced transients. IC Role / Device Role / Timing Role: LTC7860MPMSE#TRPBF controls external P-MOSFET to block reverse voltage and clamp positive surges, while supporting optional reverse-battery PMOS. Use Value: Integrates surge suppression, inrush limiting, and reverse polarity protection in one IC-controlled stage - reducing BOM count and board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS#PBF | Linear surge stopper; fixed 18V clamp; no switching, no inductor required; lower max current (2.5A typical). | Used where simplicity and zero EMI outweigh efficiency needs; unsuitable for >3A loads or extended surge duration. | Select LTC4365IMS#PBF only for low-power, space-constrained, EMI-sensitive applications where thermal design cannot accommodate switching losses. |
| TPS43060RTER | Wide-input buck controller (4.5–60V); no integrated surge-specific timer or clamp logic; requires external fault detection circuitry. | Requires custom implementation of surge response and fault timing; lacks built-in PROTECTIVE PWM mode state machine. | Choose TPS43060RTER only when full buck regulation (not just clamping) is needed and system-level fault management is already implemented. |
Compared with LTC4365IMS#PBF and TPS43060RTER, the LTC7860MPMSE#TRPBF uniquely integrates time-limited switching surge clamping, programmable fault recovery, and extended temperature operation - making it the only drop-in solution for MIL-STD-1275E and ISO 7637-2 applications requiring >3A continuous current and thermal resilience down to –55°C.
Availability
LTC7860MPMSE#TRPBF is available at Aetrix Electronics and suitable for automotive power systems, military electronics, and telecom infrastructure requiring stable component supply with guaranteed long-term availability and extended temperature support.
Supply support for LTC7860MPMSE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and aerospace markets.
The LTC7860MPMSE#TRPBF belongs to Analog Devices' Power by Linear™ surge protection product line, engineered specifically for high-reliability transient suppression in automotive, military, and telecom power systems where efficiency, thermal robustness, and time-limited fault response are critical.
FAQ
What is the primary function of the LTC7860MPMSE#TRPBF in a power system?
The LTC7860MPMSE#TRPBF functions as a high-efficiency switching surge stopper that protects downstream loads from input overvoltage transients (e.g., ISO 7637 load dumps) and overcurrent faults. It achieves this by controlling an external P-channel MOSFET in two distinct modes: 100% duty-cycle SWITCH-ON mode during normal operation and PROTECTIVE PWM mode during surges, actively regulating output voltage to a safe, user-defined clamp level. The LTC7860MPMSE#TRPBF integrates all necessary control logic, fault timing, and gate driving for this purpose.
How does the LTC7860MPMSE#TRPBF handle input voltage surges exceeding 60V?
The LTC7860MPMSE#TRPBF itself has a 60V absolute maximum VIN rating, but its architecture supports input voltages beyond 60V - up to 200V+ - using external components. This is accomplished by creating a floating ground reference via a bootstrapped shunt regulator (e.g., Zener diode), connecting the LTC7860MPMSE#TRPBF's SGND and PGND pins to that reference, and selecting either inverting or non-inverting feedback configurations. The LTC7860MPMSE#TRPBF's internal circuitry remains isolated from the high input voltage, relying only on the scaled feedback signal.
What is the significance of the exposed pad (Pin 13) on the LTC7860MPMSE#TRPBF MSOP package?
The exposed pad (Pin 13) on the LTC7860MPMSE#TRPBF is designated PGND and serves as the primary power ground connection for high-current paths, including the external MOSFET source, SENSE pin return, and CAP pin bypass. It must be soldered directly to a large PCB copper pour to ensure both electrical integrity and thermal performance - the datasheet specifies θJC = 10°C/W, which is only achievable with proper pad soldering. Failure to connect this pad compromises both safe operating area and reliability, especially under surge conditions where power dissipation spikes.
Can the LTC7860MPMSE#TRPBF be used without an inductor in the circuit?
Yes, the LTC7860MPMSE#TRPBF can operate without an inductor when used solely in SWITCH-ON mode for basic overvoltage and overcurrent protection - in this case, it functions as a smart, current-limited pass element. However, an inductor is mandatory for PROTECTIVE PWM mode operation, as the device relies on inductive energy storage to regulate output voltage during surges. The inductor also improves input EMI filtering during normal operation, as noted in the official application documentation for the LTC7860MPMSE#TRPBF.
What defines the "MP" grade in LTC7860MPMSE#TRPBF, and why is it important for military applications?
The "MP" grade in LTC7860MPMSE#TRPBF denotes a military-grade temperature rating, with full testing and characterization across –55°C to 150°C operating junction temperature. Unlike commercial (E) or industrial (I) grades, the MP grade undergoes extended burn-in, lot acceptance testing, and screening per MIL-PRF-38535 requirements. This ensures reliability under extreme thermal cycling and shock/vibration conditions typical of airborne, vehicular, and naval platforms - making the LTC7860MPMSE#TRPBF suitable for mission-critical MIL-STD-1275E implementations where failure is not an option.
LTC7860MPMSE#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
LTC7860MPMSE#TRPBF FAQ
1.How can I place an order for LTC7860MPMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7860MPMSE#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 LTC7860MPMSE#TRPBF reliable?
The price and inventory of LTC7860MPMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7860MPMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7860MPMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7860MPMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7860MPMSE#TRPBF?
LTC7860MPMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7860MPMSE#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 LTC7860MPMSE#TRPBF?
For technical support, including LTC7860MPMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7860MPMSE#TRPBF requirements.
6.How does Aetrix verify that LTC7860MPMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7860MPMSE#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 LTC7860MPMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7860MPMSE#TRPBF?
All LTC7860MPMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7860MPMSE#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 LTC7860MPMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7860MPMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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