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Analog Devices Inc. LTC4368HDD-2#WTRPBF
- Part No.:
- LTC4368HDD-2#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4368HDD-2#WTRPBF.pdf
- Description:
- 100V UV/OV & REVERSE PROT CNTR
- Quantity:
- Payment:
- Shipping:
Inventory:7,296
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Product details
Overview
LTC4368HDD-2#WTRPBF from Analog Devices is a high-reliability automotive-grade bidirectional electronic circuit breaker and UV/OV protection controller for 2.5V–60V input systems. It controls back-to-back N-channel MOSFETs to protect loads from –40V reverse voltage, +100V overvoltage, and forward/reverse overcurrent faults - with ±1.5% adjustable thresholds, 50mV forward and –3mV reverse current sense thresholds, and –40°C to +125°C operation. It is deployed in energy storage systems and automotive surge protection where robust hot-swap and AC-blocking capability are required.
For engineers reviewing the LTC4368HDD-2#WTRPBF datasheet, LTC4368HDD-2#WTRPBF pinout, LTC4368HDD-2#WTRPBF application, or LTC4368HDD-2#WTRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 32ms turn-on delay for AC blocking (50/60Hz), low 80µA operating current, precise ±50mV/–3mV bidirectional current sensing, and compatibility with external N-MOSFET gate drive up to 13.1V enhancement.
Technical Context
The LTC4368HDD-2#WTRPBF implements dual fast comparators (1µs propagation) for UV and OV detection with 25mV hysteresis, each driving a 60mA GATE pull-down sink. Its reverse overcurrent comparator is configured for –3mV threshold (LTC4368-2 variant), enabling sensitive reverse fault detection in battery backup or regenerative load scenarios.
It integrates a charge pump-based gate driver delivering up to 13.1V gate enhancement referenced to VOUT, with fast (6µs) and slow (575µs) turn-off paths, 32ms recovery delay after UV/OV faults, and automatic re-enable after reverse faults when VIN – VOUT exceeds 100mV. The device uses an internal 400kHz oscillator and supports RETRY timer configuration via external capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 2.5V to 60V - defines minimum startup voltage and maximum continuous supply voltage for system integration. |
| Protection Range | –40V to +100V - withstands reverse battery connection and transient surges without damage or latch-up. |
| Forward OC Threshold | +50mV across sense resistor - sets precise 50mV trip point for forward overcurrent, independent of temperature. |
| Reverse OC Threshold | –3mV across sense resistor - enables ultra-sensitive reverse current detection for low-loss battery backup paths. |
| UV/OV Threshold Accuracy | ±1.5% - ensures stable, repeatable window-setting for critical power-good validation in automotive ECUs. |
| Operating Current | 80µA typical - minimizes quiescent power draw in always-on vehicle subsystems like telematics or ADAS sensors. |
| Temperature Range | –40°C to +125°C - qualified for under-hood and battery-pack mounting per AEC-Q100 Grade H. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN with exposed pad (pin 11), rated for –40°C to +125°C ambient operation and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Supply Rail | Primary power input terminal; supports hot-swap and handles –40V to +100V fault transients. |
| GND | Device Ground Reference | Signal and power return path; exposed pad may be connected to PCB ground for thermal and EMI performance. |
| GATE | Gate Drive Output | Charge-pump-driven output controlling back-to-back N-MOSFET gates; delivers up to 13.1V enhancement above VOUT. |
| SENSE | Current Sense Input | Differential input measuring voltage drop across external sense resistor; detects +50mV (forward) or –3mV (reverse) faults. |
| VOUT | Output Voltage Sense | Reference node for GATE charge pump and reverse fault comparators; must rise above 2.2V UVLO before enable. |
| FAULT | Open-Drain Fault Indicator | Asserted low on UV/OV/OC/shutdown; requires external pull-up; signals system controller to initiate safety response. |
| UV / OV | Adjustable Threshold Inputs | High-impedance comparator inputs (≤10nA leakage) for configuring undervoltage/overvoltage windows via resistive dividers. |
| SHDN | Shutdown Control | Active-low enable; places device in 5µA shutdown mode and disables GATE drive while preserving fault state. |
| RETRY | Forward OC Recovery Mode | Selects latch-off (grounded) or auto-retry (capacitor-connected); sets cooldown delay (e.g., 1200ms with 22nF). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Overcurrent Protection | Separate +50mV forward and –3mV reverse thresholds enable independent control of charge/discharge paths in bidirectional DC systems. |
| AC Power Blocking | 32ms turn-on delay rejects 50Hz/60Hz AC line noise and prevents false triggering during live insertion or unstable supply conditions. |
| AEC-Q100 Automotive Qualification | Grade H (–40°C to +125°C) qualification ensures reliability in engine bay, battery management, and ADAS applications with full traceability. |
| Low Quiescent Current | 80µA operating / 5µA shutdown current extends battery life in always-on automotive modules such as CAN gateways or remote keyless entry receivers. |
| Back-to-Back N-MOSFET Control | Eliminates need for P-channel high-side switches; enables use of lower RDS(on), cost-effective N-MOSFETs in both positions with integrated gate drive. |
Applications
| Automotive Battery Management | Industrial Energy Storage Systems |
|---|---|
|
Use Scenario: Protecting BMS front-end from reverse battery connection, load dump transients, and regenerative braking current reversal. IC Role / Device Role / Timing Role: Bidirectional circuit breaker enforcing –40V to +100V input tolerance and –3mV reverse OC detection to isolate cells during fault events. Use Value: Prevents catastrophic MOSFET failure and preserves cell balancing integrity during field-deployed vehicle operation. |
Use Scenario: Securing DC-coupled ESS inverters against grid-side overvoltage, islanding-induced reverse flow, and capacitor inrush at startup. IC Role / Device Role / Timing Role: UV/OV window monitor and bidirectional OC protector with 32ms debounce, ensuring clean power handoff between grid and battery. Use Value: Enables UL 1741 SA compliance by eliminating uncontrolled reverse current and sustaining isolation during AC fault conditions. |
| Hot-Swappable Telematics Modules | Ruggedized Portable Instrumentation |
|
Use Scenario: Enabling safe insertion/removal of LTE/CAN modules into powered vehicle data buses without disrupting main ECU operation. IC Role / Device Role / Timing Role: Hot-swap controller with 80µA quiescent current and SHDN-controlled sequencing, providing controlled VOUT ramp and FAULT signaling. Use Value: Eliminates bus glitches and resets during field maintenance, improving fleet uptime and reducing diagnostic false positives. |
Use Scenario: Powering handheld test equipment from variable sources (batteries, adapters, USB-PD) subject to polarity errors and voltage excursions. IC Role / Device Role / Timing Role: Reverse polarity and UV/OV guard with ±1.5% threshold accuracy, ensuring instrument uptime despite user-supplied power variability. Use Value: Reduces field returns due to accidental reverse battery insertion or adapter mismatch in global service environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional overvoltage/overcurrent protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4368HDD-1#WTRPBF | Reverse OC threshold = –50mV (vs –3mV); identical UV/OV accuracy, package, and temp grade. | Suitable for higher-threshold reverse fault detection (e.g., motor drive freewheeling), not ultra-low-loss battery backup. | Select LTC4368HDD-1#WTRPBF only if system requires less sensitive reverse current trip and tolerates higher reverse conduction loss. |
| TPS26631RHFR | Single-direction (forward-only) protection IC; no reverse OC or –40V reverse voltage rating; 4.5V–60V range; integrated FET. | Designed for simpler 24V industrial I/O modules; lacks reverse battery or regenerative energy handling capability. | Choose TPS26631RHFR only for cost-sensitive, forward-only applications where reverse protection is handled externally or unnecessary. |
Compared with LTC4368HDD-1#WTRPBF and TPS26631RHFR, the LTC4368HDD-2#WTRPBF uniquely delivers –3mV reverse current sensitivity within an AEC-Q100 H-grade DFN package - enabling fail-safe battery backup paths and regenerative load isolation that neither alternative supports.
Availability
LTC4368HDD-2#WTRPBF is available at Aetrix Electronics and suitable for automotive battery management, industrial energy storage systems, and ruggedized portable instrumentation requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC4368HDD-2#WTRPBF 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 LTC4368 family is designed specifically for robust front-end power protection in harsh environments - delivering bidirectional fault coverage, AEC-Q100 qualification, and precision threshold control for next-generation automotive and energy infrastructure systems.
FAQ
What is the reverse overcurrent threshold of the LTC4368HDD-2#WTRPBF?
The LTC4368HDD-2#WTRPBF has a fixed reverse overcurrent threshold of –3mV across the SENSE–VOUT pins, optimized for detecting low-level reverse current in battery backup or regenerative load applications. This value is confirmed in the Electrical Characteristics table (ΔVSENSE,R for LTC4368-2) and distinguishes it from the –50mV threshold of the LTC4368-1 variant. The LTC4368HDD-2#WTRPBF maintains this specification across its full –40°C to +125°C operating range.
Does the LTC4368HDD-2#WTRPBF support hot-swap functionality?
Yes, the LTC4368HDD-2#WTRPBF supports hot-swap with built-in 32ms turn-on delay that debounces live supply connections and blocks 50Hz/60Hz AC power. Its SHDN pin allows controlled sequencing, and the FAULT output provides real-time status for upstream controllers. The device remains functional during hot-insertion events within its –40V to +100V protection range, making the LTC4368HDD-2#WTRPBF ideal for modular automotive telematics and industrial I/O systems.
What package and thermal characteristics does the LTC4368HDD-2#WTRPBF have?
The LTC4368HDD-2#WTRPBF uses a 10-lead 3mm × 3mm plastic DFN package (LGTK marking) with an exposed pad for enhanced thermal dissipation. Its θJA is 43°C/W, and maximum junction temperature is 150°C. The device is rated for –40°C to +125°C ambient operation and qualified to AEC-Q100 Grade H, confirming its suitability for under-hood automotive deployment. These thermal specs are explicitly listed in the Order Information and Absolute Maximum Ratings sections of the official datasheet for LTC4368HDD-2#WTRPBF.
How does the RETRY pin function on the LTC4368HDD-2#WTRPBF?
On the LTC4368HDD-2#WTRPBF, the RETRY pin selects forward overcurrent recovery behavior: grounding it enables latch-off (requiring SHDN toggle to reset), while connecting it to a capacitor configures auto-retry with a cooldown delay (e.g., 120ms with 22nF). This pin does not affect reverse overcurrent behavior, which automatically recovers when VIN falls 100mV below VOUT. The RETRY function is documented in the Pin Functions section and verified in the Typical Application schematic for LTC4368HDD-2#WTRPBF.
Is the LTC4368HDD-2#WTRPBF pin-compatible with other variants in the LTC4368 family?
Yes, all LTC4368 variants - including LTC4368HDD-2#WTRPBF, LTC4368HDD-1#WTRPBF, and LTC4368IMS-2#WTRPBF - share identical pinouts across DFN and MSOP packages. The LTC4368HDD-2#WTRPBF uses the same 10-pin DFN layout as other HDD-grade parts, with consistent pin numbering, electrical roles, and mechanical footprint. This allows direct substitution within the same package type without PCB changes, provided the –3mV reverse OC threshold meets system requirements.
LTC4368HDD-2#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 10-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC4368HDD-2#WTRPBF FAQ
1.How can I place an order for LTC4368HDD-2#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4368HDD-2#WTRPBF 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 LTC4368HDD-2#WTRPBF reliable?
The price and inventory of LTC4368HDD-2#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4368HDD-2#WTRPBF is usually 5 days.
3.What payment methods are accepted for LTC4368HDD-2#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4368HDD-2#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4368HDD-2#WTRPBF?
LTC4368HDD-2#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4368HDD-2#WTRPBF 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 LTC4368HDD-2#WTRPBF?
For technical support, including LTC4368HDD-2#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4368HDD-2#WTRPBF requirements.
6.How does Aetrix verify that LTC4368HDD-2#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4368HDD-2#WTRPBF 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 LTC4368HDD-2#WTRPBF meets industry standards.
7.What is the process for return or replacement of LTC4368HDD-2#WTRPBF?
All LTC4368HDD-2#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4368HDD-2#WTRPBF, 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 LTC4368HDD-2#WTRPBF part is unused and in its original packaging.
Return procedure for LTC4368HDD-2#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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