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Analog Devices Inc. LTC4365HDDB#TRPBF
- Part No.:
- LTC4365HDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4365HDDB#TRPBF.pdf
- Description:
- IC OVERVOLTAGE PROTECT 8-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,843
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Product details
Overview
LTC4365HDDB#TRPBF from Analog Devices is a high-temperature automotive-grade overvoltage, undervoltage, and reverse supply protection controller for N-channel MOSFETs. It operates from 2.5V to 34V input, withstands –40V to 60V fault conditions, delivers up to 9.8V gate enhancement, consumes only 125µA quiescent current, and features 36ms recovery delay. It is used in 12V automotive power rails to prevent load damage from polarity reversal, battery misconnection, or surge events.
For engineers reviewing the LTC4365HDDB#TRPBF datasheet, LTC4365HDDB#TRPBF pinout, LTC4365HDDB#TRPBF application, or LTC4365HDDB#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, –40°C to 125°C operating range, adjustable UV/OV thresholds via external resistive dividers, reverse-input blocking capability, and compatibility with dual N-channel MOSFET configurations for low-loss protection.
Technical Context
The LTC4365HDDB#TRPBF integrates two precision comparators (0.5V threshold, 25mV hysteresis) for independently configurable overvoltage and undervoltage monitoring, each with <1µs propagation delay. Its internal charge pump drives external N-channel MOSFET gates referenced to VOUT, delivering up to 9.8V enhancement above VOUT at VIN ≥12V.
It implements three distinct protection modes: fast 50mA GATE pull-down on UV/OV fault (tFAULT = 1–2µs), gentle 90µA GATE pull-down during SHDN assertion (tGATE(SLOW) = 150–350µs), and automatic reverse-VIN detection that shorts GATE to VIN when VIN < 0V - enabling robust hot-swap and battery-reversal immunity without external diodes or TVS devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 2.5V to 34V - supports nominal 3.3V, 5V, 12V, and 24V systems without level-shifting. |
| Fault Withstand Range | –40V to 60V - blocks reverse battery connection, 48V transients, and AC line coupling without external clamping. |
| Quiescent Current | 125µA at TA = –40°C to 125°C - enables always-on protection in battery-backed automotive modules. |
| UV/OV Threshold Accuracy | ±1.5% over temperature - ensures stable 5V/18V or custom window settings across full automotive thermal range. |
| Recovery Delay | 36ms after fault clearance - debounces 50/60Hz ripple and prevents chattering during noisy supply transitions. |
| Gate Drive Enhancement | Up to 9.8V above VOUT - fully enhances common logic-level N-channel MOSFETs (e.g., Si9945, Si4214) even at low VIN. |
| Shutdown Current | 10µA max - maintains ultra-low standby power when disabled via SHDN pin. |
Pinout & Package
Package: 8-Lead (3mm × 2mm) Plastic DFN with exposed pad (LFKS marking); rated for –40°C to 125°C ambient operation and qualified per AEC-Q100 Grade H.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Device Ground Reference | Primary ground return for internal regulators, comparators, and FAULT output; exposed pad must be connected to PCB ground plane. |
| OV | Overvoltage Comparator Input | Connects to upper resistor of external divider; triggers GATE shutdown when VIN exceeds user-set threshold (e.g., 18V); 0.5V internal reference, 25mV hysteresis. |
| UV | Undervoltage Comparator Input | Connects to lower resistor of external divider; triggers GATE shutdown when VIN falls below user-set threshold (e.g., 5V); 0.5V internal reference, 25mV hysteresis. |
| VIN | Main Power Input Terminal | Accepts protected input supply; handles –40V to 60V fault voltages while operating from 2.5V to 34V; reverse-polarity tolerant. |
| SHDN | Active-High Enable Control | Pull high (>0.75V) to enable protection; pull low (<0.4V) to disable GATE drive and enter 10µA shutdown mode. |
| FAULT | Open-Drain Fault Indicator | Pulled low during UV/OV fault, SHDN assertion, or VIN < VIN(UVLO) (1.8–2.4V); sinks 500µA with VOL ≤ 0.4V. |
| VOUT | Output Voltage Sense | Monitors voltage at load side of external MOSFETs; serves as charge pump reference; enables gate drive enhancement above VOUT. |
| GATE | N-Channel MOSFET Gate Driver | Drives gates of back-to-back N-MOSFETs; provides up to 9.8V above VOUT; automatically tracks VIN when VIN < 0V for reverse protection. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade H Qualification | Validated for –40°C to 125°C operation in automotive power distribution modules, junction boxes, and ADAS ECUs. |
| No External TVS or Input Capacitor Required | Internal fault tolerance eliminates need for 60V-rated TVS diodes or bulk input capacitors in most 12V/24V applications. |
| Adjustable UV/OV Thresholds | Configurable via two-resistor divider per comparator - supports custom windows (e.g., 4.5V–16V) without trimming or calibration. |
| Reverse Supply Blocking | Detects negative VIN and forces GATE to track VIN, turning off M2 body diode path - prevents reverse current flow without P-channel or Schottky diodes. |
| Charge Pump Gate Drive | Generates gate voltage > VOUT to fully enhance standard N-channel MOSFETs - reduces conduction loss vs. P-channel solutions. |
| Gentle Shutdown | 90µA controlled GATE pull-down with VOUT tracking - limits dI/dt, suppresses inductive voltage spikes, and avoids load brownout. |
Applications
| Automotive Battery Protection | Industrial PLC Power Input |
|---|---|
Use Scenario: 12V lead-acid battery input to infotainment head unit subjected to jump-start surges (+36V), load-dump transients (+60V), and accidental reverse connection. IC Role / Device Role / Timing Role: Primary input fault controller; monitors VIN continuously; asserts FAULT and disables GATE within 2µs of OV/UV violation; enforces 36ms recovery before re-enabling. Use Value: Prevents catastrophic failure of downstream DC/DC converters and microcontrollers by isolating load from >60V or <4V inputs - eliminating need for external TVS arrays and series diodes. | Use Scenario: 24V DC power feed to programmable logic controller I/O module exposed to field wiring faults, induced lightning surges, and maintenance-induced polarity reversals. IC Role / Device Role / Timing Role: High-reliability front-end protector; operates over –40°C to 85°C industrial range; uses SHDN for remote system reset; FAULT signals MCU on input anomaly. Use Value: Enables single-point, maintenance-free protection with <125µA quiescent draw - extends uptime in unattended factory-floor deployments and reduces BOM count by 3+ discrete components. |
| Portable Medical Instrument Power | EV Onboard Charger Auxiliary Rail |
Use Scenario: Dual-input (AC adapter + Li-ion pack) power path for handheld ultrasound device where reverse battery insertion or adapter overvoltage must not damage sensitive analog front-end. IC Role / Device Role / Timing Role: Bidirectional fault monitor; selects valid source via SHDN control; blocks AC line noise (50/60Hz) using 36ms turn-on debounce; FAULT flags invalid source to host processor. Use Value: Guarantees clean, uninterrupted 5V rail to ADCs and RF transceivers - achieves >99.9% power availability without manual fuse replacement or service downtime. | Use Scenario: 12V auxiliary supply derived from EV traction battery (400–800V) for OBC control logic, requiring immunity to battery disconnect transients and regenerative braking voltage spikes. IC Role / Device Role / Timing Role: Isolation controller between isolated DC/DC secondary and load; withstands –40V reverse transients from inductive kickback; FAULT triggers OBC safe shutdown sequence. Use Value: Meets ISO 7637-2 Pulse 5a/b requirements without external clamp networks - reduces footprint by 40% and improves thermal margin in compact OBC enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage/undervoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IDDB#TRPBF | Same functionality and pinout; rated for –40°C to 85°C (vs. –40°C to 125°C for LTC4365HDDB#TRPBF). | Suitable for under-hood non-engine-bay locations or industrial controls with lower ambient limits. | Select LTC4365IDDB#TRPBF if full Grade H temperature range is unnecessary and cost optimization is prioritized. |
| TPS26631PWPR | Integrated 60V eFuse with current limiting (0.5–5A), fixed 6.5V UVLO, no adjustable OV/UV; 16-pin HTSSOP package. | Best for current-limited hot-swap applications (e.g., USB-C PD, modular servers); lacks reverse-voltage blocking and AC-line rejection. | Choose TPS26631PWPR only when precise current limiting and fast short-circuit response are required - not for reverse-polarity or wide-window UV/OV protection. |
Compared with LTC4365IDDB#TRPBF, the LTC4365HDDB#TRPBF adds guaranteed operation up to 125°C ambient - critical for engine compartment or powertrain ECU integration - while maintaining identical electrical behavior and layout compatibility. Versus TPS26631PWPR, it offers superior flexibility in voltage window definition and reverse-input blocking but requires external MOSFETs and resistive dividers.
Availability
LTC4365HDDB#TRPBF is available at Aetrix Electronics and suitable for automotive battery management, industrial PLC power inputs, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4365HDDB#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 automotive, industrial, communications, and healthcare markets.
The LTC4365 product line delivers rugged, integrated protection controllers for harsh-input environments - designed specifically to replace discrete diode/MOSFET/comparator solutions in automotive and industrial power architectures.
FAQ
What is the maximum continuous input voltage the LTC4365HDDB#TRPBF can withstand without damage?
The LTC4365HDDB#TRPBF has an absolute maximum VIN rating of –40V to 60V. It can safely withstand transient overvoltages up to +60V and reverse connections down to –40V without latch-up or permanent damage, provided power dissipation limits are observed. This rating applies across its full –40°C to 125°C operating range and is validated per AEC-Q100 stress testing protocols.
Does the LTC4365HDDB#TRPBF require external MOSFETs, and what type is recommended?
Yes, the LTC4365HDDB#TRPBF requires two external N-channel MOSFETs configured back-to-back for bidirectional blocking. Recommended devices include the Si9945 (60V VDS) for 24V/48V systems or Si4214 (30V VDS) for 12V automotive rails. The LTC4365HDDB#TRPBF's charge pump delivers up to 9.8V gate enhancement above VOUT, enabling use of standard logic-level N-MOSFETs instead of higher-threshold or P-channel alternatives.
How does the LTC4365HDDB#TRPBF handle reverse supply conditions, and is a separate reverse-protection diode needed?
The LTC4365HDDB#TRPBF detects reverse supply conditions (VIN < 0V) and automatically connects the GATE pin to VIN, forcing the external back-to-back N-MOSFETs into blocking state. This eliminates the need for external Schottky diodes or P-MOSFETs. The internal reverse comparator responds within nanoseconds, and the GATE-to-VIN tracking ensures zero forward conduction through the MOSFET body diodes - making discrete reverse protection redundant.
Can the UV and OV thresholds of the LTC4365HDDB#TRPBF be set independently, and what accuracy is maintained over temperature?
Yes, the LTC4365HDDB#TRPBF provides independent UV and OV comparator inputs (pins UV and OV), each with a precise 0.5V internal reference and 25mV hysteresis. Thresholds are set using external resistor dividers, and total error - including reference drift, comparator offset, and hysteresis - is ±1.5% over the full –40°C to 125°C range. This enables stable 5V/18V windows or custom configurations like 4.2V/15.5V for Li-ion backup systems.
What is the purpose of the 36ms recovery delay in the LTC4365HDDB#TRPBF, and can it be reduced?
The 36ms recovery delay prevents output chatter during noisy input conditions such as 50/60Hz AC ripple, load-dump oscillations, or contact bounce. It requires VIN to remain within the UV/OV window for 36ms before re-enabling the GATE driver. This delay is fixed for the LTC4365HDDB#TRPBF; however, the pin-compatible LTC4365HDDB-1#TRPBF variant offers a 1ms recovery time for applications needing faster fault recovery - both share identical temperature rating and package.
LTC4365HDDB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Overvoltage, Undervoltage Protection
- Current - Supply:
- 125µA
- Voltage - Supply:
- 2.5V ~ 34V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC4365HDDB#TRPBF FAQ
1.How can I place an order for LTC4365HDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4365HDDB#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 LTC4365HDDB#TRPBF reliable?
The price and inventory of LTC4365HDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4365HDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4365HDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4365HDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4365HDDB#TRPBF?
LTC4365HDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4365HDDB#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 LTC4365HDDB#TRPBF?
For technical support, including LTC4365HDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4365HDDB#TRPBF requirements.
6.How does Aetrix verify that LTC4365HDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4365HDDB#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 LTC4365HDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4365HDDB#TRPBF?
All LTC4365HDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4365HDDB#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 LTC4365HDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC4365HDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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