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Analog Devices Inc. LTC4368HDD-1#WTRPBF
- Part No.:
- LTC4368HDD-1#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4368HDD-1#WTRPBF.pdf
- Description:
- 100V UV/OV & REVERSE PROT CNTR
- Quantity:
- Payment:
- Shipping:
Inventory:2,375
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Product details
Overview
LTC4368HDD-1#WTRPBF from Analog Devices is a high-reliability bidirectional electronic circuit breaker and UV/OV protection controller for automotive-grade 2.5V–60V power rails. It controls back-to-back N-channel MOSFETs to block reverse supply down to –40V, overvoltage up to 100V, and forward/reverse overcurrent (±50mV sense threshold), with 32ms turn-on delay for AC blocking and hot-swap robustness - deployed in energy storage systems and 12V/24V automotive ECUs.
For engineers reviewing the LTC4368HDD-1#WTRPBF datasheet, LTC4368HDD-1#WTRPBF pinout, LTC4368HDD-1#WTRPBF application, or LTC4368HDD-1#WTRPBF equivalent, key selection criteria include its –40°C to 125°C AEC-Q100 qualified DFN package, ±1.5% adjustable UV/OV thresholds, 80µA operating current, 5µA shutdown current, and reverse current fault re-enable at ΔVRR = 75–125mV (VIN – VOUT).
Technical Context
The LTC4368HDD-1#WTRPBF implements dual fast comparators (1µs propagation) for UV (0.5V falling threshold, 25mV hysteresis) and OV (0.5V rising threshold, 25mV hysteresis), each driving a 60mA GATE pull-down sink. Its bidirectional current sensing uses a single SENSE–VOUT differential input with fixed +50mV (forward) and –50mV (reverse, LTC4368-1 variant) thresholds, enabling detection of both load-to-source and source-to-load faults.
Gate drive employs an internal charge pump delivering up to 13.1V enhancement (GATE – VOUT) across VIN = 2.5V–60V, with fast (2–6µs) and slow (150–575µs) turn-off paths controlled by fault type and SHDN state. A 32ms recovery delay enforces stable power-good window validation before reconnecting after UV/OV faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 2.5V to 60V - supports standard 12V/24V automotive and industrial rails with full functionality. |
| Protection Range | –40V to 100V - blocks reverse battery connection and transient surges without damage. |
| Forward/Reverse OC Threshold | +50mV / –50mV (SENSE–VOUT) - sets precise 50mV/RSENSE trip point for bidirectional current limiting. |
| UV/OV Threshold Accuracy | ±1.5% - enables stable 7V–36V valid window configuration using external resistor dividers. |
| Quiescent Current | 80µA (active), 5µA (shutdown) - minimizes standby power loss in always-on vehicle modules. |
| Temperature Range | –40°C to 125°C - qualified per AEC-Q100 Grade H for under-hood and powertrain applications. |
| GATE Drive Capability | Up to 13.1V (GATE–VOUT) - ensures full enhancement of low-RDS(on) N-MOSFETs across full input range. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN with exposed pad (optional ground connection). RoHS-compliant, tape-and-reel packaged (WTRPBF suffix denotes automotive-grade wafer processing and traceable sourcing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Supply Rail | Primary power input; withstands –40V to 100V transients; includes 2.2V UVLO for safe startup. |
| UV | Undervoltage Comparator Input | Connects to resistive divider; triggers GATE shutdown when VIN falls below user-set threshold (0.5V comparator reference). |
| OV | Overvoltage Comparator Input | Connects to resistive divider; triggers immediate GATE shutdown when VIN exceeds user-set threshold (0.5V comparator reference). |
| RETRY | Forward OC Recovery Mode Select | Grounded → latch-off; capacitor-connected → auto-retry with 5.5ms/nF cooldown (e.g., 22nF = ~120ms). |
| GND | Device Ground Reference | System return path for internal logic, comparators, and gate drive circuitry. |
| GATE | N-MOSFET Gate Driver Output | Charge-pump-driven output; pulls up to VOUT+13.1V, pulls down via 60mA sink during faults. |
| SENSE | Current Sense Input | Differential input referenced to VOUT; detects +50mV (forward) or –50mV (reverse) across RSENSE. |
| VOUT | Output Voltage Sense & Charge Pump Reference | Sense node for reverse OC detection; provides charge pump input when >5V; requires ≥1µF local bypass. |
| FAULT | Open-Drain Fault Indicator | Pulled low on UV/OV/OC/SHDN assertion; requires external pull-up; signals system-level fault management. |
| SHDN | Shutdown Control Input | Active-low enable; <0.75V disables GATE drive and reduces current to 5µA; toggling clears latched OC faults. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Overcurrent Protection | Simultaneous +50mV (forward) and –50mV (reverse) sensing enables fail-safe disconnection during load dump or regenerative braking. |
| AC Power Blocking | 32ms turn-on delay prevents 50Hz/60Hz AC line coupling into DC loads - eliminates need for external rectification in dual-supply systems. |
| AEC-Q100 Grade H Qualification | Validated for –40°C to 125°C operation with automotive reliability testing - suitable for engine control, ADAS, and battery management. |
| Adjustable UV/OV Window | External resistor dividers set precise thresholds (e.g., 7V–36V); ±1.5% accuracy and 25mV hysteresis prevent chatter near trip points. |
| Hot-Swappable Input Support | Robust VIN pin tolerates live insertion/removal; internal UVLO and 32ms debounce ensure glitch-free connection sequencing. |
Applications
| Automotive Battery Protection | Industrial Energy Storage Systems |
|---|---|
Use Scenario: Reverse battery connection during service or jump-start attempts in 12V/24V vehicle electrical systems. IC Role / Device Role / Timing Role: Bidirectional circuit breaker that disconnects load within 8µs of –50mV SENSE–VOUT detection, then re-enables only after VOUT falls 100mV below VIN. Use Value: Prevents catastrophic MOSFET failure and PCB trace melting by enforcing strict –40V reverse blocking and fast fault isolation. | Use Scenario: Protecting Li-ion battery packs from overvoltage during charging and reverse current during cell balancing or fault conditions. IC Role / Device Role / Timing Role: UV/OV supervisor and bidirectional current limiter controlling back-to-back N-MOSFETs in high-side protection FET stack. Use Value: Enables use of cost-effective N-channel MOSFETs instead of P-channel, reducing conduction losses by >40% versus discrete solutions. |
| Hot-Swappable Industrial Power Modules | Surge-Protected Telecom Power Inputs |
Use Scenario: Insertion/removal of powered daughterboards or field-replaceable units in 48V telecom or server racks. IC Role / Device Role / Timing Role: Inrush-limited power sequencer with 32ms debounced turn-on and RETRY-configurable auto-recovery after overcurrent events. Use Value: Eliminates contact arcing and voltage droop during hot-swap, ensuring uninterrupted operation of downstream FPGA or ASIC loads. | Use Scenario: Front-end protection of 48V PoE-powered equipment against lightning-induced surges and EFT bursts. IC Role / Device Role / Timing Role: Primary overvoltage clamp (100V max) and bidirectional current interrupter placed upstream of DC-DC converters. Use Value: Withstands repeated 100V transients without degradation, maintaining >10-year field life in outdoor base station deployments. |
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-2#WTRPBF | Reverse OC threshold = –3mV (vs –50mV), enabling ultra-low-loss reverse current limiting for sensitive analog front-ends. | Suitable for precision instrumentation where microamp-level reverse leakage must be blocked without false trips. | Select LTC4368HDD-2#WTRPBF only if sub-10mV reverse fault detection is required; otherwise LTC4368HDD-1#WTRPBF provides higher noise immunity. |
| TPS26631RHFR | Single-direction (forward-only) protection; no reverse voltage or reverse current capability; integrated MOSFET; lower voltage range (4.5V–60V). | Applicable only in unidirectional 24V industrial I/O modules where reverse polarity is mechanically prevented. | Choose TPS26631RHFR for cost-sensitive, space-constrained designs without reverse protection requirements; LTC4368HDD-1#WTRPBF remains mandatory for true bidirectional safety. |
Compared with LTC4368HDD-2#WTRPBF, the LTC4368HDD-1#WTRPBF offers superior noise margin for reverse fault detection in noisy automotive environments; compared with TPS26631RHFR, it delivers essential reverse polarity and bidirectional current protection absent in the TI device - making it irreplaceable in battery-connected or dual-supply systems.
Availability
LTC4368HDD-1#WTRPBF is available at Aetrix Electronics and suitable for automotive battery management, industrial energy storage, and telecom surge protection requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC4368HDD-1#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, 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 product line delivers automotive-qualified, high-voltage bidirectional protection controllers designed specifically for robust power rail conditioning in harsh environments - addressing reverse battery, load dump, and regenerative energy challenges in next-generation E/E architectures.
FAQ
What is the reverse voltage protection limit of the LTC4368HDD-1#WTRPBF?
The LTC4368HDD-1#WTRPBF provides reverse supply protection down to –40V at the VIN pin. This rating is absolute maximum and applies across its full –40°C to 125°C operating range. The device actively blocks reverse current flow using its –50mV reverse overcurrent threshold and internal logic that holds GATE low until VOUT falls 100mV below VIN - ensuring safe disconnection during battery reversal events. This specification is validated per AEC-Q100 stress testing protocols.
How does the LTC4368HDD-1#WTRPBF handle overvoltage faults above 60V?
The LTC4368HDD-1#WTRPBF maintains functional protection up to 100V on VIN, well beyond its 60V operating range. When VIN exceeds the user-configured OV threshold (set via external resistors on the OV pin), the device asserts FAULT and sinks 60mA from GATE to rapidly discharge external MOSFET gates - isolating the load within microseconds. This 100V absolute maximum rating is sustained without damage, enabling robust defense against load-dump transients common in 12V/24V automotive systems.
Can the LTC4368HDD-1#WTRPBF be used with P-channel MOSFETs?
No, the LTC4368HDD-1#WTRPBF is explicitly designed to drive back-to-back N-channel MOSFETs only. Its GATE output is a charge-pump-enhanced high-side driver referenced to VOUT, delivering up to 13.1V above VOUT to fully enhance N-MOSFETs. Driving P-channel devices would require inverted logic, negative gate drive, and incompatible topology - none of which are supported. The datasheet, application circuits, and internal architecture assume N-channel configurations exclusively.
What is the purpose of the 32ms turn-on delay in the LTC4368HDD-1#WTRPBF?
The 32ms turn-on delay in the LTC4368HDD-1#WTRPBF serves two critical functions: first, it debounces live supply connections to prevent false triggering during mechanical contact bounce; second, it blocks 50Hz and 60Hz AC power by ensuring the input remains stable within the UV/OV window for >16 cycles before enabling GATE. This delay is hardware-implemented and active after every UV/OV fault clearance or power-up event, guaranteeing clean, chatter-free power delivery to sensitive downstream loads.
Is the LTC4368HDD-1#WTRPBF pin-compatible with other variants in the LTC4368 family?
Yes, all LTC4368 variants - including LTC4368HDD-1#WTRPBF, LTC4368HDD-2#WTRPBF, and LTC4368IMS-1#PBF - share identical pinouts across DFN and MSOP packages. The LTC4368HDD-1#WTRPBF uses the 10-lead 3mm × 3mm DFN (LGTH marking), matching pin-for-pin with other DFN variants. Functionally, differences are limited to reverse OC threshold (–50mV vs –3mV) and temperature grade (–40°C to 125°C), with no impact on PCB layout or interconnect design.
LTC4368HDD-1#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-1#WTRPBF FAQ
1.How can I place an order for LTC4368HDD-1#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4368HDD-1#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-1#WTRPBF reliable?
The price and inventory of LTC4368HDD-1#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-1#WTRPBF is usually 5 days.
3.What payment methods are accepted for LTC4368HDD-1#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4368HDD-1#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4368HDD-1#WTRPBF?
LTC4368HDD-1#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4368HDD-1#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-1#WTRPBF?
For technical support, including LTC4368HDD-1#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4368HDD-1#WTRPBF requirements.
6.How does Aetrix verify that LTC4368HDD-1#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4368HDD-1#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-1#WTRPBF meets industry standards.
7.What is the process for return or replacement of LTC4368HDD-1#WTRPBF?
All LTC4368HDD-1#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4368HDD-1#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-1#WTRPBF part is unused and in its original packaging.
Return procedure for LTC4368HDD-1#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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