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Analog Devices Inc. LTC4368IDD-2#WPBF
- Part No.:
- LTC4368IDD-2#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4368IDD-2#WPBF.pdf
- Description:
- 100V UV/OV & REVERSE PROT CNTR
- Quantity:
- Payment:
- Shipping:
Inventory:135
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Product details
Overview
LTC4368IDD-2#WPBF from Analog Devices is a bidirectional electronic circuit breaker and UV/OV protection controller for 2.5V–60V input systems, featuring –3mV reverse overcurrent threshold, ±1.5% adjustable voltage thresholds, and 80µA operating current. It controls back-to-back N-channel MOSFETs to protect loads in automotive surge protection, energy storage systems, and portable instrumentation against –40V reverse, 100V overvoltage, and bidirectional overcurrent faults.
For engineers reviewing the LTC4368IDD-2#WPBF datasheet, LTC4368IDD-2#WPBF pinout, LTC4368IDD-2#WPBF application, or LTC4368IDD-2#WPBF equivalent, key selection criteria include its –40°C to 85°C industrial temperature grade, 3mm × 3mm DFN package with exposed pad, AEC-Q100 qualification, and precise –3mV reverse current sensing capability-critical for low-threshold reverse battery protection and energy recovery circuits.
Technical Context
The LTC4368IDD-2#WPBF implements dual high-accuracy comparators (UV/OV) with 25mV hysteresis and 1µs propagation delay, enabling fast response to supply excursions outside user-defined windows. Its bidirectional current sense architecture uses separate forward (+50mV) and reverse (–3mV) thresholds referenced to SENSE–VOUT, with automatic re-enable after reverse fault when VIN–VOUT exceeds 75mV.
Gate drive employs an internal charge pump delivering up to 13.1V enhancement above VOUT, supporting low-RDS(on) N-MOSFETs; fast turn-off (2µs) and slow turn-off (275µs) paths allow controlled disconnection during forward/reverse faults. A 32ms turn-on delay debounces live connections and blocks 50/60Hz AC power intrusion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 60V operating; –40V to 100V protection range-enables robust operation across automotive battery transients and industrial DC rails. |
| Reverse Overcurrent Threshold | –3mV (SENSE–VOUT)-specific to LTC4368-2 variant; enables ultra-low-threshold reverse polarity detection for sensitive energy storage interfaces. |
| Forward Overcurrent Threshold | +50mV (SENSE–VOUT)-fixed precision threshold for reliable forward short-circuit and overload detection. |
| UV/OV Threshold Accuracy | ±1.5%-achieved via 0.5V internal reference with 25mV hysteresis; ensures stable window-based power-good validation under temperature variation. |
| Operating Current | 80µA at VIN = 12V-minimizes quiescent loss in always-on battery-backed systems. |
| Shutdown Current | 5µA-supports ultra-low-power system sleep modes without compromising protection readiness. |
| Package | 10-Lead (3mm × 3mm) Plastic DFN with exposed pad-provides thermal efficiency and compact layout for space-constrained automotive modules. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN (LGTK), –40°C to 85°C operating range, exposed pad (Pin 11) optional ground connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE | Gate drive output | Drives back-to-back N-MOSFET gates with up to 13.1V enhancement above VOUT; includes fast (60mA) and slow (90µA) pull-down paths for controlled fault isolation. |
| SENSE | Current sense input | Detects bidirectional overcurrent: +50mV for forward (VIN→VOUT), –3mV for reverse (VOUT→VIN); triggers immediate GATE discharge on fault. |
| VOUT | Output voltage sense | Reference node for GATE charge pump and reverse fault comparators; must rise above 2.2V UVLO before reverse re-enable logic activates. |
| FAULT | Open-drain fault indicator | Pulled low on UV/OV/current fault or SHDN assertion; requires external pull-up; signals system controller of protection event. |
| SHDN | Shutdown control input | Active-low enable: high (>0.75V) enables operation; low (<0.4V) forces 5µA shutdown mode and GATE discharge. |
| VIN | Main supply input | Accepts –40V to 100V; includes 2.2V UVLO; hot-swap capable below 24V; powers internal LDO and charge pump. |
| UV | Undervoltage comparator input | Connects to resistive divider; 0.5V falling threshold with 25mV hysteresis; low leakage (<10nA) allows high-value dividers for minimal power loss. |
| OV | Overvoltage comparator input | Connects to resistive divider; 0.5V rising threshold with 25mV hysteresis; same low-leakage design as UV for precision window setting. |
| RETRY | Forward OC retry/latch control | Grounded → latch-off on forward fault; capacitor-connected → auto-retry after 120ms cooldown (CRETRY = 22nF); unconnected disables retry. |
| GND | Device ground reference | Primary return path for internal circuitry and gate drive sink currents; connects to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional overcurrent protection | Separate +50mV (forward) and –3mV (reverse) thresholds enable independent, low-latency fault detection in both power flow directions-critical for regenerative braking and battery backup systems. |
| 32ms turn-on delay | Debounces noisy supply connections and inherently blocks 50/60Hz AC line interference-eliminates need for external AC rejection circuitry in universal-input designs. |
| AEC-Q100 qualified | Rated for –40°C to 85°C operation with automotive-grade reliability testing-validates suitability for under-hood and infotainment power management. |
| Back-to-back N-MOSFET control | Eliminates body diode conduction path in reverse polarity events, achieving true bidirectional blocking without P-MOSFET RDS(on) penalty or gate drive complexity. |
| Adjustable UV/OV window | Configurable via two external resistors per threshold; ±1.5% accuracy maintained across temperature-ensures consistent power-good behavior in varying environmental conditions. |
Applications
| Automotive Battery Protection | Industrial Energy Storage Interface |
|---|---|
|
Use Scenario: Prevents damage from reverse battery installation or jump-start polarity errors in 12V/24V vehicle subsystems. IC Role / Device Role / Timing Role: Controls back-to-back N-MOSFETs to block –40V reverse supply while maintaining <100ns fault response time. Use Value: Eliminates need for series Schottky diodes, reducing forward drop by >0.3V and enabling full battery voltage delivery to ECUs. |
Use Scenario: Safeguards lithium-ion battery packs during charge/discharge cycles where bidirectional current flow occurs. IC Role / Device Role / Timing Role: Monitors SENSE–VOUT for –3mV reverse overcurrent to detect cell imbalance or short-circuit during regenerative charging. Use Value: Enables precise low-threshold reverse fault detection without external amplification, preserving measurement accuracy down to µA-level leakage currents. |
| Portable Instrumentation Power Input | Hot-Swappable Industrial DC Supply |
|
Use Scenario: Protects handheld test equipment from accidental connection to overvoltage wall adapters or miswired lab supplies. IC Role / Device Role / Timing Role: Enforces 7V–36V valid input window using UV/OV resistive dividers; asserts FAULT within 2µs of excursion. Use Value: Guarantees no power delivery outside safe operating range, preventing IC latch-up or sensor damage in field-deployed instruments. |
Use Scenario: Enables safe insertion/removal of redundant 48V DC power modules in telecom or server racks without system interruption. IC Role / Device Role / Timing Role: Uses 32ms turn-on delay to suppress contact bounce and transient spikes during hot-swap events. Use Value: Provides seamless failover between power sources while blocking 50/60Hz AC coupling from shared bus lines. |
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 |
|---|---|---|---|
| LTC4368IDD-1#WPBF | Reverse overcurrent threshold is –50mV instead of –3mV; identical UV/OV accuracy, package, and temperature grade. | Suitable for higher-threshold reverse fault detection (e.g., reverse load dump), not for ultra-low-voltage energy recovery. | Select LTC4368IDD-1#WPBF only when –50mV reverse sensitivity meets system requirements; pin-compatible but functionally distinct in reverse direction. |
| TPS26631RGER | Single-direction (forward-only) protection IC with integrated 80mΩ FET; no reverse voltage or reverse current protection capability. | Applicable only to unidirectional 4.5V–60V supplies; lacks reverse battery or regenerative current handling. | Choose TPS26631RGER for cost-sensitive, forward-only applications where reverse protection is handled externally; not a functional substitute for bidirectional use cases. |
Compared with LTC4368IDD-1#WPBF, the LTC4368IDD-2#WPBF provides 16.7× lower reverse overcurrent trip point (–3mV vs –50mV), enabling detection of microamp-level reverse leakage in energy harvesting systems; versus TPS26631RGER, it delivers true bidirectional blocking and external MOSFET flexibility at the cost of higher BOM count and design effort.
Availability
LTC4368IDD-2#WPBF is available at Aetrix Electronics and suitable for automotive surge protection, energy storage systems, and portable instrumentation requiring stable component supply with AEC-Q100 compliance and extended temperature support.
Supply support for LTC4368IDD-2#WPBF 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 industrial, automotive, communications, and healthcare markets.
The LTC4368 product line delivers integrated UV/OV and bidirectional overcurrent protection controllers for harsh-environment power inputs, designed specifically to replace discrete protection solutions in automotive and industrial systems demanding reliability and precision.
FAQ
What is the reverse overcurrent threshold of the LTC4368IDD-2#WPBF?
The LTC4368IDD-2#WPBF has a fixed reverse overcurrent threshold of –3mV (SENSE–VOUT), which is specific to the "-2" variant and enables ultra-sensitive detection of reverse current flow. This value is confirmed in the Electrical Characteristics table (ΔVSENSE,R) and distinguishes it from the –50mV threshold of the LTC4368-1 family members. The LTC4368IDD-2#WPBF uses this low threshold to support applications like battery reverse polarity protection and regenerative energy monitoring where early fault detection is critical.
Does the LTC4368IDD-2#WPBF support AEC-Q100 qualification?
Yes, the LTC4368IDD-2#WPBF is explicitly designated as an automotive-grade part in the Order Information table, with "#W" suffix indicating controlled manufacturing for AEC-Q100 compliance. It operates across –40°C to 85°C and is validated for automotive reliability requirements including HTOL, TC, and ESD testing. The LTC4368IDD-2#WPBF data sheet states these models are "available for use in automotive applications" and references Automotive Reliability reports available through Analog Devices.
How does the RETRY pin configure forward overcurrent behavior in the LTC4368IDD-2#WPBF?
In the LTC4368IDD-2#WPBF, the RETRY pin determines whether forward overcurrent faults trigger latched-off shutdown or auto-retry. When grounded, the device latches off and requires SHDN toggling to reset; when connected to a capacitor (e.g., 22nF), it initiates a ~120ms cooldown before automatic reconnection. This behavior is documented in the Pin Functions section and Electrical Characteristics (tRETRY). The LTC4368IDD-2#WPBF supports both modes without external logic, simplifying fault recovery design in mission-critical systems.
What is the purpose of the 32ms turn-on delay in the LTC4368IDD-2#WPBF?
The 32ms turn-on delay in the LTC4368IDD-2#WPBF serves two verified functions: it debounces mechanical contact bounce during hot-swap events and inherently blocks 50Hz and 60Hz AC power intrusion by exceeding half-cycle durations (10ms and 8.3ms respectively). This timing is specified in the Block Diagram and Operation section, and eliminates the need for external AC filtering components. The LTC4368IDD-2#WPBF applies this delay after UV/OV faults clear or at initial power-up, ensuring stable power delivery only after supply stabilization.
Can the LTC4368IDD-2#WPBF be used with back-to-back P-channel MOSFETs?
No, the LTC4368IDD-2#WPBF is specifically designed to drive back-to-back N-channel MOSFETs, as stated in the Features and Description sections. Its gate drive architecture provides enhancement voltage referenced to VOUT and includes dedicated fast/slow pull-down paths optimized for N-MOSFET gate capacitance and body diode blocking. Using P-MOSFETs would invert control logic and disable reverse protection functionality. The LTC4368IDD-2#WPBF datasheet explicitly specifies "controls back-to-back N-channel MOSFETs" and shows only N-MOSFET configurations in all application diagrams.
LTC4368IDD-2#WPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 10-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tube
- 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)
LTC4368IDD-2#WPBF FAQ
1.How can I place an order for LTC4368IDD-2#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4368IDD-2#WPBF 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 LTC4368IDD-2#WPBF reliable?
The price and inventory of LTC4368IDD-2#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4368IDD-2#WPBF is usually 5 days.
3.What payment methods are accepted for LTC4368IDD-2#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4368IDD-2#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4368IDD-2#WPBF?
LTC4368IDD-2#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4368IDD-2#WPBF 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 LTC4368IDD-2#WPBF?
For technical support, including LTC4368IDD-2#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4368IDD-2#WPBF requirements.
6.How does Aetrix verify that LTC4368IDD-2#WPBF is sourced from the original manufacturer or authorized distributors?
All LTC4368IDD-2#WPBF 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 LTC4368IDD-2#WPBF meets industry standards.
7.What is the process for return or replacement of LTC4368IDD-2#WPBF?
All LTC4368IDD-2#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4368IDD-2#WPBF, 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 LTC4368IDD-2#WPBF part is unused and in its original packaging.
Return procedure for LTC4368IDD-2#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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