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Analog Devices Inc. LTC7860HMSE#TRPBF
- Part No.:
- LTC7860HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7860HMSE#TRPBF.pdf
- Description:
- HIGH EFFICIENCY SWITCHING SURGE
- Quantity:
- Payment:
- Shipping:
Inventory:8,567
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Product details
Overview
LTC7860HMSE#TRPBF from Analog Devices is a high-efficiency switching surge stopper controller IC designed to protect downstream loads from automotive load dumps, ISO 7637 transients, and MIL-STD-1275 surges. It operates in SWITCH-ON mode (100% duty cycle) during normal input conditions (3.5V–60V), and switches into PROTECTIVE PWM mode during overvoltage or overcurrent events-regulating output voltage clamps up to 18V while limiting peak current via external sense resistor. Used in vehicle power systems with external P-channel MOSFET and power inductor.
For engineers reviewing the LTC7860HMSE#TRPBF datasheet, LTC7860HMSE#TRPBF pinout, LTC7860HMSE#TRPBF application, or LTC7860HMSE#TRPBF equivalent, this page delivers verified functional identity, thermal-grade packaging (–40°C to 150°C), programmable fault timer, adjustable 50kHz–850kHz switching frequency, and confirmed VIN-to-VOUT surge clamping behavior per Analog Devices Rev. G datasheet.
Technical Context
The LTC7860HMSE#TRPBF implements peak current-mode control with transconductance error amplifier (gm = 1.8 mS) and slope compensation for stable regulation in PROTECTIVE PWM mode. Its dual-mode operation-SWITCH-ON (dropout) and PROTECTIVE PWM-is governed by real-time monitoring of VFB, ITH, and TMR voltage thresholds, enabling precise transition between conduction and active regulation.
It features integrated gate driver with regulated VCAP bias (VIN–VCAP = 8V typical), programmable UVLO (3.25V/3.5V hysteresis), and foldback frequency reduction (to ~18% of setpoint) when VFB drops below 0.4V-ensuring robust short-circuit and start-up protection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.5V to 60V operating; supports >200V with external floating ground design |
| Output Clamp | Adjustable up to 18V via feedback divider; regulates during load dump surges |
| Switching Frequency | 50kHz to 850kHz programmable via FREQ pin resistor; fixed 350kHz (grounded) or 535kHz (open) |
| Fault Timer | Programmable via CTMR capacitor; TSETI = 44 ms/µF typical, enables thermal-safe time-limited PWM operation |
| Current Limit Threshold | 95 mV across RSENSE (±10 mV tolerance); sets peak output current with Kelvin sensing |
| Junction Temp Range | –40°C to +150°C (H-grade); validated for automotive under-hood and military environments |
| Package | 12-lead MSOP with exposed PGND pad; θJC = 10°C/W, requires soldered thermal pad |
Pinout & Package
12-lead plastic MSOP package with exposed PGND pad (Pin 13), thermally enhanced for high-power transient handling. Exposed pad must be soldered to PCB for electrical continuity and thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR (1) | Fault timer control node | 30 µA pull-up current charges CTMR; 1.29V threshold triggers shutdown; 240 mV restart threshold enables cool-down recovery |
| FREQ (2) | Switching frequency programming | 20 µA internal current source sets oscillator via RFREQ; grounding = 350 kHz, open = 535 kHz, resistor = 50–850 kHz |
| SGND (3) | Analog signal reference | Separate ground for VFB, SS, ITH, VFBN; must connect to PGND at single point to avoid noise coupling |
| SS (4) | Soft-start and tracking input | Internal 10 µA pull-up charges external CSS; regulates VFB to min(0.8V, VSS) for controlled VOUT ramp |
| VFB (5) | Feedback sense input | Regulated to 0.800 V ±9 mV; determines output voltage via RFB1/RFB2 divider; folds back frequency if <0.4V |
| ITH (6) | Error amplifier output & compensation | 0–2.9V range; sets peak inductor current threshold; connects to external RC network for loop stability |
| VFBN (7) | Inverting feedback reference | 0 V threshold; enables inverting configuration for >60V VIN; tie >2V to disable and use standard feedback |
| RUN (8) | Enable/disable control | 1.26 V enable threshold with 150 mV hysteresis; internal 0.4 µA pull-up allows direct 60V logic interface |
| CAP (9) | GATE driver bias supply | Regulated LDO output (VIN–VCAP = 8V); requires ≥0.47 µF low-ESR ceramic bypass to VIN |
| SENSE (10) | Current sense input | Differential input referenced to VIN; measures RSENSE voltage drop for overcurrent protection |
| VIN (11) | Main power input | Supplies internal circuitry; requires ≥0.1 µF ceramic bypass to PGND; absolute max 65V |
| GATE (12) | P-channel MOSFET driver output | Drives external high-side PMOS; rail-to-rail swing with 2 Ω pull-up / 0.9 Ω pull-down resistance |
| PGND (13) | Power ground reference | Exposed pad; mandatory solder connection for thermal dissipation and low-impedance return path |
Key Features
| Feature | Design Value |
|---|---|
| PROTECTIVE PWM Mode | Active regulation during transients (e.g., ISO 7637 pulse 5a); limits VOUT to safe clamp level without linear dissipation |
| SWITCH-ON Mode | 100% duty cycle conduction; insertion loss determined only by RDS(on) of external PMOS and PCB trace resistance |
| Adjustable Fault Timer | Prevents thermal runaway by limiting cumulative PWM time; enables smaller heatsinks and optimized normal-operation thermal design |
| Reverse Battery Protection Ready | Supports optional external PMOS on input side; complements surge protection for automotive cold-crank and reverse-polarity scenarios |
| EMI-Optimized Normal Operation | Power inductor in series with VIN reduces input EMI vs. linear surge stoppers; no high-frequency switching noise during steady state |
Applications
| Automotive Load Dump Protection | ISO 7637-2 Compliant Power Supply |
|---|---|
|
Use Scenario: Vehicle battery system subjected to 12V/24V load dump transients up to 60V for 400ms (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: LTC7860HMSE#TRPBF acts as pre-regulator controlling external PMOS gate to clamp VOUT at 18V during surge, transitioning from SWITCH-ON to PROTECTIVE PWM mode within microseconds. Use Value: Enables downstream 12V-rated ECUs to survive transients without derating or oversized TVS diodes; reduces board area vs. linear solutions. |
Use Scenario: Telecom or industrial power module requiring immunity to repetitive 12V/24V line surges per ISO 7637-2 test profiles. IC Role / Device Role / Timing Role: LTC7860HMSE#TRPBF provides time-limited PWM regulation with programmable TMR, ensuring reliable recovery after each transient event. Use Value: Eliminates need for external watchdog timers or microcontroller intervention; guarantees autonomous fault clearing and restart. |
| MIL-STD-1275 Vehicle Power | High-Voltage Industrial Input Protection |
|
Use Scenario: Military vehicle electronics exposed to 28V bus surges up to 100V for 500ms (MIL-STD-1275B). IC Role / Device Role / Timing Role: LTC7860HMSE#TRPBF regulates output using external power inductor and PMOS, maintaining stable 12V/24V output despite input collapse or overshoot. Use Value: Supports wide VIN range (3.5V–60V native, extendable to 200V+) while meeting stringent military thermal and reliability requirements. |
Use Scenario: Industrial control system with unregulated 48V–100V DC input subject to lightning-induced surges. IC Role / Device Role / Timing Role: LTC7860HMSE#TRPBF implements inverting feedback topology with floating ground, enabling safe operation above 60V VIN. Use Value: Avoids costly high-voltage gate drivers or isolated controllers; leverages standard PMOS and passive components for cost-effective HV surge hardening. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS#PBF | Linear surge stopper IC; no external inductor required; lower max current (2.5A), fixed 28V clamp | Suitable for lower-power, space-constrained designs where efficiency is secondary to simplicity | Select LTC4365IMS#PBF when board area is critical and peak load current ≤2.5A; not suitable for high-current or >60V applications. |
| TPS43060RTER | Wide-input synchronous buck controller (4.5V–60V); lacks integrated fault timer and surge-specific protection logic | Requires external circuitry for transient detection and shutdown; no built-in PROTECTIVE PWM mode | Choose TPS43060RTER only when full DC/DC regulation is needed continuously-not for surge-only protection roles. |
Compared with LTC4365IMS#PBF, the LTC7860HMSE#TRPBF delivers higher current capability and superior thermal efficiency during surges; compared with TPS43060RTER, it provides purpose-built fault timing, automatic mode switching, and simplified layout for transient-only protection.
Availability
LTC7860HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive power systems, MIL-STD-1275 compliant vehicle electronics, and industrial equipment requiring stable component supply with extended temperature support (–40°C to +150°C).
Supply support for LTC7860HMSE#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, and automotive markets.
The LTC7860HMSE#TRPBF belongs to Analog Devices' Power by Linear™ surge protection controller family, engineered specifically for high-reliability transient suppression in harsh environments-emphasizing thermal robustness, autonomous fault response, and seamless integration with external PMOS and inductors.
FAQ
What is the maximum input voltage the LTC7860HMSE#TRPBF can handle?
The LTC7860HMSE#TRPBF has an absolute maximum VIN rating of 65V and operates continuously from 3.5V to 60V. With external floating-ground circuitry (e.g., Zener-shunted PGND/SGND), its effective input range extends reliably beyond 200V-confirmed in Analog Devices' Applications Information section for VIN > 60V configurations.
Does the LTC7860HMSE#TRPBF support reverse battery protection?
Yes-the LTC7860HMSE#TRPBF supports optional reverse input voltage protection via an additional external PMOS placed on the input side. The datasheet explicitly states "An additional PMOS can be added for reverse battery protection," and the RUN pin's 60V rating and SGND/PGND separation facilitate such implementation without signal integrity compromise.
How does the fault timer in the LTC7860HMSE#TRPBF prevent thermal damage?
The LTC7860HMSE#TRPBF uses an external capacitor on the TMR pin to set a precise time limit for PROTECTIVE PWM operation. When the TMR voltage reaches 1.29V (charged by 30 µA), the controller shuts down the GATE output. After cooling-during which TMR discharges to 240 mV at 1.3 µA-it automatically restarts. This ensures high-loss PWM mode never exceeds thermally sustainable duration.
Can the LTC7860HMSE#TRPBF operate without an external inductor?
No-the LTC7860HMSE#TRPBF requires an external power inductor for PROTECTIVE PWM mode operation, as it functions as a step-down switching regulator during transients. In SWITCH-ON mode, the inductor remains in series but carries full current with minimal loss; omitting it would disable surge protection and violate the functional architecture described in the datasheet's Typical Application and Operation sections.
What is the significance of the H-grade temperature rating for LTC7860HMSE#TRPBF?
The "H" in LTC7860HMSE#TRPBF denotes Analog Devices' high-reliability grade, guaranteeing full electrical performance from –40°C to +150°C junction temperature. This makes the LTC7860HMSE#TRPBF suitable for under-hood automotive, military, and industrial applications where ambient temperatures exceed standard commercial or industrial grades-validated per Rev. G datasheet Notes 3 and Absolute Maximum Ratings.
LTC7860HMSE#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
LTC7860HMSE#TRPBF FAQ
1.How can I place an order for LTC7860HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7860HMSE#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 LTC7860HMSE#TRPBF reliable?
The price and inventory of LTC7860HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7860HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7860HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7860HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7860HMSE#TRPBF?
LTC7860HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7860HMSE#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 LTC7860HMSE#TRPBF?
For technical support, including LTC7860HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7860HMSE#TRPBF requirements.
6.How does Aetrix verify that LTC7860HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7860HMSE#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 LTC7860HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7860HMSE#TRPBF?
All LTC7860HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7860HMSE#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 LTC7860HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7860HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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