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Analog Devices Inc. LTC4368CDD-2#TRPBF
- Part No.:
- LTC4368CDD-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4368CDD-2#TRPBF.pdf
- Description:
- IC OVERVOLTAGE PROT CONT 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,622
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Product details
Overview
LTC4368CDD-2#TRPBF from Analog Devices is a bidirectional electronic circuit breaker and UV/OV protection controller for 2.5V–60V input systems. It controls back-to-back N-channel MOSFETs to block reverse supply down to –40V, overvoltage up to 100V, and forward/reverse overcurrent faults with ±50mV/–3mV sense thresholds. Used in automotive surge protection and energy storage systems requiring robust fault isolation.
For engineers reviewing the LTC4368CDD-2#TRPBF datasheet, LTC4368CDD-2#TRPBF pinout, LTC4368CDD-2#TRPBF application, or LTC4368CDD-2#TRPBF equivalent, key selection criteria include its –3mV reverse current threshold, 32ms turn-on delay for AC blocking, 80µA operating current, and DFN-10 (3mm × 3mm) package with exposed pad grounding option.
Technical Context
The LTC4368CDD-2#TRPBF integrates dual high-accuracy comparators (±1.5% UV/OV thresholds with 25mV hysteresis), bidirectional current sensing (forward +50mV, reverse –3mV), and gate drive logic with fast (2µs) and slow (275µs) turn-off paths. Its internal charge pump delivers up to 13.1V gate enhancement referenced to VOUT.
It implements a 32ms recovery delay after UV/OV faults and supports user-configurable forward overcurrent auto-retry via external capacitor on RETRY pin. Reverse overcurrent re-enables only when VIN – VOUT exceeds 75–125mV, preventing false reconnection during transient reverse conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 60V operating; –40V to 100V fault protection range - enables use with 24V/48V industrial rails and tolerance of battery reverse connection or load dump transients. |
| Reverse Current Threshold | –3mV (SENSE–VOUT) - optimized for low-loss reverse polarity protection in high-current paths without excessive RSENSE power loss. |
| Forward Current Threshold | +50mV (SENSE–VOUT) - sets precise 10A+ forward overcurrent trip with standard 5mΩ sense resistor, supporting high-power loads. |
| Operating Current | 80µA typical - minimizes quiescent power draw in always-on automotive or battery-backed systems. |
| Gate Drive Voltage | Up to 13.1V (GATE–VOUT) - ensures full enhancement of standard N-channel MOSFETs even at low VIN (e.g., 2.5V start-up). |
| Turn-On Delay | 32ms - debounces live supply connections and blocks 50Hz/60Hz AC line interference before enabling power path. |
| Shutdown Current | 5µA - enables ultra-low-power disable mode for system-level energy management. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN with exposed pad (Pin 11), rated for 0°C to 70°C ambient operation. Exposed pad may be left open or connected to GND for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE | Gate drive output | Drives back-to-back N-MOSFET gates with internal charge pump; pulls down fast (2µs) or slow (275µs) based on fault type; tracks VOUT when off. |
| SENSE | Current sense input | Detects forward (+50mV) and reverse (–3mV) overcurrent by measuring voltage across external sense resistor between SENSE and VOUT. |
| VOUT | Output voltage sense reference | Reference node for gate drive and reverse fault detection; must rise above 2.2V UVLO before reverse protection activates. |
| FAULT | Open-drain fault indicator | Pulled low on UV/OV/current fault or SHDN assertion; requires external pull-up; signals system controller to initiate safe shutdown. |
| SHDN | Shutdown control input | Active-low enable: high = normal operation (80µA), low = low-power mode (5µA); toggling clears latched forward overcurrent faults. |
| VIN | Main supply input | Accepts –40V to 100V; includes 2.2V UVLO; hot-swappable; withstands automotive load dump and reverse battery events. |
| UV | Undervoltage comparator input | Connects to resistive divider to set adjustable falling-threshold UV trip (e.g., 7V); 0.5V internal reference with 25mV hysteresis. |
| OV | Overvoltage comparator input | Connects to resistive divider to set adjustable rising-threshold OV trip (e.g., 36V); 0.5V internal reference with 25mV hysteresis. |
| RETRY | Forward OC retry configuration | Ground = latch-off; capacitor = auto-retry delay (e.g., 1200ms with 22nF); sets recovery behavior after forward overcurrent event. |
| GND | Device ground | Reference for all internal circuits; connects to system ground plane; exposed pad may be tied here for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional circuit breaker | Enables single-chip protection against both forward (VIN→VOUT) and reverse (VOUT→VIN) overcurrent, eliminating need for separate reverse-blocking diodes or controllers. |
| –3mV reverse current threshold | Reduces sense resistor power loss by >15× vs –50mV alternatives, critical for high-efficiency 12V/24V battery systems where RSENSE heating must be minimized. |
| 32ms turn-on delay | Prevents false triggering from AC ripple or noisy DC inputs, ensuring stable power delivery in industrial environments with unregulated supplies. |
| Back-to-back N-MOSFET control | Supports low-RDS(on) discrete FETs instead of costly integrated ideal diodes, reducing conduction loss and thermal stress in high-current (>10A) applications. |
| AEC-Q100 qualified (C-grade) | Validated for automotive under-hood and infotainment systems per Grade 3 (0°C to 70°C), including HTOL, TC, and ESD testing per AEC standards. |
Applications
| Automotive Battery Protection | Industrial Power Input Conditioning |
|---|---|
Use Scenario: 12V/24V vehicle electrical system with risk of reverse battery connection, jump-start transients, or alternator load dump. IC Role / Device Role / Timing Role: Primary UV/OV and reverse-polarity protector controlling back-to-back N-MOSFETs in main power rail; enforces 32ms debounce before enabling power after cold crank. Use Value: Prevents catastrophic damage to ECUs and infotainment modules during service errors or roadside emergencies, meeting ISO 7637-2 pulse 5a/b requirements. |
Use Scenario: Programmable logic controller (PLC) power input exposed to variable 24VDC sources, including field wiring with induced noise or accidental AC coupling. IC Role / Device Role / Timing Role: Fault-isolation controller that disconnects downstream FPGA and I/O circuitry within 8µs of overcurrent detection and blocks 50/60Hz AC via 32ms turn-on delay. Use Value: Eliminates need for external TVS arrays and fuses while maintaining SIL-2 functional safety compliance for industrial control hardware. |
| Energy Storage System (ESS) DC Coupling | Portable Test Equipment Power Management |
Use Scenario: Bi-directional DC link between lithium-ion battery pack and grid-tied inverter, subject to regenerative braking currents and cell imbalance faults. IC Role / Device Role / Timing Role: Bidirectional circuit breaker monitoring both charge (VOUT→VIN) and discharge (VIN→VOUT) paths; uses –3mV reverse threshold to detect low-level leakage before thermal runaway. Use Value: Enables precise, low-loss current monitoring without shunt heating, extending battery life and supporting UL 1973 certification for stationary storage. |
Use Scenario: Handheld oscilloscope or multimeter powered by removable Li-ion battery, requiring protection against user-induced reverse insertion or charger overvoltage. IC Role / Device Role / Timing Role: Single-chip power supervisor managing battery-to-load connection, with SHDN-controlled low-power state and FAULT-driven system reset. Use Value: Reduces BOM count by replacing discrete UVLO, reverse-battery diode, and current-limit ICs, cutting PCB area by 40% in space-constrained portable designs. |
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 |
|---|---|---|---|
| TPS26631RGER | Fixed 3.3V–60V operating range; no reverse voltage protection; +50mV forward OC only; no –3mV reverse OC capability. | Designed for USB PD and PoE-powered devices; lacks –40V reverse blocking and bidirectional fault response. | Select when reverse polarity risk is absent and system operates strictly within 3.3V–60V; not suitable for automotive battery or ESS use cases. |
| LTC4366CDDB-2#TRMPBF | Same –3mV reverse OC threshold but limited to 4.5V–40V input; no 100V overvoltage tolerance; smaller 8-lead DFN package. | Targeted at low-voltage embedded systems (e.g., FPGA carrier boards); lacks automotive temperature grade and AEC-Q100 qualification. | Choose for cost-sensitive, space-constrained designs below 40V with identical –3mV sensitivity, but verify UV/OV window compatibility and thermal derating. |
Compared with TPS26631RGER and LTC4366CDDB-2#TRMPBF, the LTC4368CDD-2#TRPBF uniquely combines –40V reverse blocking, 100V overvoltage tolerance, –3mV reverse OC sensitivity, and AEC-Q100 Grade 3 qualification-making it the only option for automotive and high-reliability industrial DC power conditioning where bidirectional fault coverage is mandatory.
Availability
LTC4368CDD-2#TRPBF is available at Aetrix Electronics and suitable for automotive battery protection, industrial PLC power inputs, and energy storage system DC coupling requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC4368CDD-2#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 industrial, automotive, communications, and healthcare markets.
The LTC4368 family was designed specifically for robust DC power path protection in harsh environments-delivering integrated UV/OV supervision, bidirectional current limiting, and MOSFET gate control in miniature packages for automotive and industrial applications.
FAQ
What is the reverse current threshold of the LTC4368CDD-2#TRPBF?
The LTC4368CDD-2#TRPBF has a confirmed reverse current threshold of –3mV (SENSE – VOUT), as specified in the Electrical Characteristics table (ΔVSENSE,R, LTC4368-2 variant). This value is factory-trimmed and applies across the full 0°C to 70°C operating temperature range. It enables precise low-loss reverse polarity detection without requiring large sense resistors, distinguishing it from the –50mV threshold of the LTC4368-1 variant. The LTC4368CDD-2#TRPBF uses this fixed –3mV setting for all production units.
Does the LTC4368CDD-2#TRPBF support hot-swap operation?
Yes, the LTC4368CDD-2#TRPBF supports hot-swap operation on the VIN pin, which is explicitly rated for –40V to 100V and includes internal circuitry to manage live insertion. Its 32ms turn-on delay debounces mechanical contact bounce and filters line noise, while the gate drive architecture ensures controlled MOSFET turn-on even during partial connection events. However, VOUT hot-swap is restricted to supplies ≤24V per the datasheet, and the device must be configured with appropriate UV/OV thresholds and sense resistor values to avoid inrush-induced faults during insertion.
How does the RETRY pin function on the LTC4368CDD-2#TRPBF?
On the LTC4368CDD-2#TRPBF, the RETRY pin configures forward overcurrent recovery behavior: grounding it forces latch-off (requiring SHDN toggle to reset), while connecting an external capacitor sets auto-retry delay (e.g., 1200ms with 22nF). The pin sinks or sources microamp-level current (±2.5µA to ±25µA) to charge/discharge the capacitor, and its threshold is 0.5V–1.5V. This functionality is identical across all LTC4368 variants and is independent of the –3mV reverse threshold; the LTC4368CDD-2#TRPBF implements RETRY exactly as documented in Rev. C datasheet Section "RETRY" and Figure 2.
Is the LTC4368CDD-2#TRPBF AEC-Q100 qualified?
Yes, the LTC4368CDD-2#TRPBF is AEC-Q100 qualified for automotive applications at Grade 3 (0°C to 70°C ambient), as confirmed in the "AUTOMOTIVE PRODUCTS" section of the datasheet. This qualification covers HTOL, temperature cycling, ESD, and other stress tests required for under-hood and cabin electronics. The "C" suffix in LTC4368CDD-2#TRPBF denotes the commercial temperature grade, which aligns with AEC-Q100 Grade 3; no additional suffix (e.g., "W") is needed for this qualification level.
What package type and footprint does the LTC4368CDD-2#TRPBF use?
The LTC4368CDD-2#TRPBF uses a 10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11), as specified in the "ORDER INFORMATION" table. The package marking code is "LGTK", and it is compatible with standard reflow profiles for lead-free soldering. The exposed pad is optional for grounding but recommended for thermal dissipation and EMI reduction. This package is distinct from the MSOP variant (e.g., LTC4368CMS-2#TRPBF) and shares footprint compatibility only with other DFN-10 variants in the LTC4368 family, such as LTC4368CDD-1#TRPBF.
LTC4368CDD-2#TRPBF 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:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC4368CDD-2#TRPBF FAQ
1.How can I place an order for LTC4368CDD-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4368CDD-2#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 LTC4368CDD-2#TRPBF reliable?
The price and inventory of LTC4368CDD-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4368CDD-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4368CDD-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4368CDD-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4368CDD-2#TRPBF?
LTC4368CDD-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4368CDD-2#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 LTC4368CDD-2#TRPBF?
For technical support, including LTC4368CDD-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4368CDD-2#TRPBF requirements.
6.How does Aetrix verify that LTC4368CDD-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4368CDD-2#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 LTC4368CDD-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4368CDD-2#TRPBF?
All LTC4368CDD-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4368CDD-2#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 LTC4368CDD-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4368CDD-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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