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Analog Devices Inc. LTC7860MPMSE#PBF
- Part No.:
- LTC7860MPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7860MPMSE#PBF.pdf
- Description:
- HIGH EFFICIENCY SW SURGE 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,536
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Product details
Overview
LTC7860MPMSE#PBF 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 during normal operation (VIN = 3.5V–60V), and PROTECTIVE PWM mode during faults, clamping VOUT to a user-adjustable safe level. 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#PBF datasheet, LTC7860MPMSE#PBF pinout, LTC7860MPMSE#PBF application, or LTC7860MPMSE#PBF equivalent, key selection considerations include its extended industrial/military temperature grade (–55°C to 150°C), fault timer programmability via TMR pin, gate driver bias LDO (VIN–VCAP = 8V), soft-start control via SS pin, and compatibility with both inverting and non-inverting feedback configurations for VIN > 60V applications.
Technical Context
The LTC7860MPMSE#PBF implements peak current-mode control with a transconductance error amplifier (gm = 1.8 mS) and internal 0.8V reference, regulating VFB to either the SS pin voltage (during soft-start) or the fixed reference. Its PROTECTIVE PWM mode uses a dedicated fault timer (TMR pin) with 30µA pull-up, 40µA pull-down, and 1.3µA cool-down current to strictly limit high-loss regulation time-enabling thermal optimization for normal operation while surviving transient surges.
It supports dual feedback architectures: non-inverting (VFBN > 2V) for standard ≤60V VIN operation, and inverting (VFBN connected to floating ground) for VIN up to 200V+, using external transistor-based level-shifting. Gate drive is optimized for P-channel MOSFETs, with VIN–VCAP regulated to 8V (dropout < 3.5V) and low RUP (2Ω) / RDN (0.9Ω) for fast switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Operating Range | 3.5V to 60V continuous; extendable to 200V+ with external level-shifting circuitry |
| Operating Junction Temp | –55°C to 150°C - fully tested and guaranteed for military/extended industrial use |
| Switching Frequency | 50kHz to 850kHz - set by resistor on FREQ pin or fixed at 350kHz (GND) / 535kHz (open) |
| Current Limit Threshold | 95mV (typical) across RSENSE - sets peak output current as IOUT(MAX) = 95mV / RSENSE |
| Feedback Reference | 0.800V ±1.1% - regulates VFB to this value; used with resistor divider to program VOUT |
| Fault Timer Control | TMR pin accepts 1µF capacitor for ~44ms initial fault detection (TSETI = VGTH/ITPU) |
| GATE Driver Bias | VIN–VCAP = 8.0V (typical) - stable gate drive for P-MOSFETs; drops out below 3.5V |
Pinout & Package
Package: 12-lead plastic MSOP with exposed PGND pad (Pin 13), thermally enhanced for high-power surge protection applications. Exposed pad must be soldered to PCB for electrical continuity and thermal performance (θJA = 40°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR (1) | Fault timer control node | 30µA pull-up initiates shutdown when 1.29V threshold reached; 40µA pull-down resets after fault clears |
| FREQ (2) | Switching frequency programming | 20µA current source sets oscillator frequency via external resistor; GND = 350kHz, open = 535kHz |
| SGND (3) | Analog signal ground reference | Reference for VFB, ITH, SS, VFBN; must connect to PGND at single point to avoid noise coupling |
| SS (4) | Soft-start and tracking input | Internal 10µA pull-up charges external capacitor; regulates VFB to SS voltage during ramp-up |
| VFB (5) | Output voltage feedback sense | Regulated to 0.8V; resistor divider from VOUT sets output voltage per VOUT = 0.8V × (1 + R1/R2) |
| ITH (6) | Error amplifier output & compensation | 0–2.9V range; sum of EA output and slope compensation sets peak inductor current threshold |
| VFBN (7) | Inverting feedback reference input | 0V threshold; enables floating-ground feedback for VIN > 60V; tie >2V to disable inverting mode |
| RUN (8) | Enable/disable control | 1.26V threshold; internal 0.4µA pull-up allows direct connection to up to 60V supply |
| CAP (9) | GATE driver bias supply | Requires ≥0.47µF ceramic cap to VIN; forms LDO output (VIN–VCAP = 8V) for P-MOSFET gate drive |
| SENSE (10) | Current sense input | Kelvin-connected to RSENSE; differential voltage (VIN–SENSE) compared to 95mV limit for overcurrent protection |
| VIN (11) | Main power input | Supplies internal circuitry; requires ≥0.1µF ceramic bypass to PGND near pin |
| GATE (12) | P-MOSFET gate driver output | Drives external P-channel MOSFET gate; low RUP/RDN ensures fast turn-on/turn-off |
| PGND (13) | Power ground reference | Exposed pad; must be soldered to PCB plane for thermal dissipation and low-impedance return path |
Key Features
| Feature | Design Value |
|---|---|
| PROTECTIVE PWM Mode | Active during input overvoltage or overcurrent; regulates VOUT to safe clamp level without linear power loss |
| SWITCH-ON Mode | 100% duty cycle operation minimizes insertion loss (RDS(on) × IIN) during normal conditions |
| Programmable Fault Timer | TMR pin enables precise control of maximum time spent in high-loss PWM mode, enabling smaller thermal design |
| Flexible Feedback Architecture | Supports both non-inverting (≤60V VIN) and inverting (up to 200V+ VIN) configurations with external transistor level-shifting |
| Adjustable Soft-Start | SS pin with internal 10µA current source allows controlled VOUT ramp-up to prevent inrush current damage |
| Reverse Battery Protection Ready | Optional external PMOS can be added between VIN and input capacitor for reverse polarity protection |
Applications
| Automotive Load Dump Protection | Industrial Power Input Conditioning |
|---|---|
Use Scenario: Protecting infotainment, ADAS, or telematics modules from 12V/24V vehicle bus surges (ISO 7637-2 Pulse 5a, up to 100V for 400ms). IC Role / Device Role / Timing Role: Acts as pre-regulator controlling external P-MOSFET to clamp VOUT to 13.8V during surge, maintaining uninterrupted operation. Use Value: Enables use of standard 16V-rated downstream components instead of costly 100V-rated parts, reducing BOM cost and board area. | Use Scenario: Securing PLC I/O modules or motor drives against AC line transients and DC bus overvoltage events in factory automation. IC Role / Device Role / Timing Role: Provides fast-response overvoltage clamping (PROTECTIVE PWM) and programmable overcurrent limiting (SENSE pin) before upstream fuses blow. Use Value: Eliminates need for bulky TVS diodes or linear regulators, achieving >95% efficiency in normal operation and compact solution size. |
| Military Vehicle Power (MIL-STD-1275) | Telecom DC Power Distribution |
Use Scenario: Ensuring mission-critical avionics or communications equipment survives 28V bus surges up to 100V for 500ms per MIL-STD-1275E. IC Role / Device Role / Timing Role: Operates in SWITCH-ON mode under nominal conditions; switches to PROTECTIVE PWM only during validated surge events, preserving thermal margin. Use Value: Guaranteed –55°C to 150°C operation meets MIL-PRF-38535 Class H requirements; TMR timer prevents thermal runaway during sustained faults. | Use Scenario: Protecting 48V telecom rectifier outputs feeding distributed baseband units or remote radio heads from lightning-induced surges. IC Role / Device Role / Timing Role: Clamps VOUT to 54V during 100V/10ms surges while maintaining regulated output to downstream DC/DC converters. Use Value: Supports high-current delivery (>10A) with minimal voltage drop in normal mode, unlike linear surge limiters limited by thermal constraints. |
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 external inductor; fixed 18V clamp; 3.5V–34V VIN range; no PWM mode | Suitable for lower-current (<3A), space-constrained designs where simplicity and zero EMI outweigh efficiency needs | Select LTC4365IMS#PBF when board area is critical and peak load current is ≤3A; LTC7860MPMSE#PBF preferred for >5A or high-efficiency requirements. |
| LTC7862MPMSE#PBF | Pin-compatible upgrade; adds adjustable foldback frequency, improved gate drive strength, and enhanced EMI performance | Same footprint and function; supports higher-frequency operation (up to 1MHz) and tighter transient response for next-gen designs | LTC7862MPMSE#PBF offers backward compatibility and improved specs; choose LTC7860MPMSE#PBF only for legacy qualification or cost-sensitive production. |
Compared with LTC4365IMS#PBF, LTC7860MPMSE#PBF delivers higher output current and efficiency but requires an external inductor and MOSFET; versus LTC7862MPMSE#PBF, it lacks foldback frequency adjustment and has slightly lower gate drive capability, making it suitable for cost-optimized or mature-design deployments.
Availability
LTC7860MPMSE#PBF is available at Aetrix Electronics and suitable for automotive electronics, military-grade power systems, and industrial embedded controllers requiring stable component supply across extreme temperature ranges and long product lifecycles.
Supply support for LTC7860MPMSE#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, industrial automation, aerospace, and communications markets.
The LTC7860MPMSE#PBF belongs to Analog Devices' Power by Linear™ surge protection controller family, engineered specifically for high-reliability DC input conditioning in harsh environments where input transients, wide temperature operation, and fault resilience are critical.
FAQ
What is the guaranteed operating temperature range for the LTC7860MPMSE#PBF?
The LTC7860MPMSE#PBF is fully tested and guaranteed over a junction temperature range of –55°C to 150°C, meeting extended industrial and military environmental requirements. This is explicitly defined in the Order Information table and confirmed in Note 3 of the Electrical Characteristics section, distinguishing it from E/I/H grade variants.
How does the LTC7860MPMSE#PBF implement overvoltage protection without an integrated MOSFET?
The LTC7860MPMSE#PBF controls an external P-channel MOSFET via its GATE pin, using two distinct operating modes: SWITCH-ON mode (100% duty cycle, minimal insertion loss) during normal input conditions, and PROTECTIVE PWM mode (switching regulation) during overvoltage events to clamp VOUT. This architecture avoids internal power dissipation limits while enabling high-current capability.
Can the LTC7860MPMSE#PBF be used with input voltages above 60V, and if so, how?
Yes - the LTC7860MPMSE#PBF supports VIN up to 200V+ using external level-shifting circuitry. For VIN > 60V, a floating ground (e.g., Zener-biased shunt regulator) is created, and the inverting feedback option (VFBN connected to floating ground) translates VOUT down to the IC's 0.8V reference, decoupling feedback sensing from absolute VIN potential.
What is the role of the TMR pin on the LTC7860MPMSE#PBF, and how is it configured?
The TMR pin on the LTC7860MPMSE#PBF implements a programmable fault timer that strictly limits time spent in high-loss PROTECTIVE PWM mode. A capacitor (e.g., 22µF) from TMR to SGND sets the timeout period; internal 30µA pull-up charges it to 1.29V to trigger shutdown, then 1.3µA pull-down cools down before restart, preventing thermal damage during sustained faults.
Does the LTC7860MPMSE#PBF support reverse battery protection, and what is required?
The LTC7860MPMSE#PBF does not integrate reverse battery protection but provides a design-ready interface for it. An optional external PMOS transistor can be placed between VIN and the input capacitor, with its gate driven by the LTC7860MPMSE#PBF's RUN or GATE signals (via level-shifting), enabling robust reverse polarity protection without additional controller ICs.
LTC7860MPMSE#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
LTC7860MPMSE#PBF FAQ
1.How can I place an order for LTC7860MPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7860MPMSE#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 LTC7860MPMSE#PBF reliable?
The price and inventory of LTC7860MPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7860MPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7860MPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7860MPMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7860MPMSE#PBF?
LTC7860MPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7860MPMSE#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 LTC7860MPMSE#PBF?
For technical support, including LTC7860MPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7860MPMSE#PBF requirements.
6.How does Aetrix verify that LTC7860MPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7860MPMSE#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 LTC7860MPMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7860MPMSE#PBF?
All LTC7860MPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7860MPMSE#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 LTC7860MPMSE#PBF part is unused and in its original packaging.
Return procedure for LTC7860MPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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