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Analog Devices Inc. LTC4368HDD-1#PBF
- Part No.:
- LTC4368HDD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4368HDD-1#PBF.pdf
- Description:
- IC SURGE SUPPRESSION ADJ 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:378
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Product details
Overview
LTC4368HDD-1#PBF from Analog Devices is a high-reliability bidirectional electronic circuit breaker and UV/OV/reverse protection controller for automotive and industrial power rails. It operates from 2.5V to 60V input, provides ±100V/–40V fault tolerance, features +50mV forward and –50mV reverse current sense thresholds (LTC4368-1 variant), and controls back-to-back N-channel MOSFETs in hot-swap 24V systems with 10A load capability.
For engineers reviewing the LTC4368HDD-1#PBF datasheet, LTC4368HDD-1#PBF pinout, LTC4368HDD-1#PBF application, or LTC4368HDD-1#PBF equivalent, key selection criteria include its –40°C to 125°C AEC-Q100 qualified operation, 32ms turn-on debounce, 5µA shutdown current, and precise ±1.5% adjustable UV/OV thresholds using external resistive dividers.
Technical Context
The LTC4368HDD-1#PBF integrates dual fast comparators (1µs propagation) for UV and OV monitoring with 25mV hysteresis, bidirectional overcurrent sensing with independent +50mV (forward) and –50mV (reverse) thresholds, and a charge-pump-based gate driver delivering up to 13.1V enhancement above VOUT. Its internal logic enforces a mandatory 32ms recovery delay after any UV/OV fault before re-enabling the external MOSFETs.
It implements pin-selectable forward overcurrent response-latch-off when RETRY is grounded, or auto-retry with user-configurable cooldown (e.g., 1200ms with 22nF capacitor). Reverse overcurrent recovery requires VIN to fall ≥100mV below VOUT before automatic reconnection, preventing oscillation during sustained reverse faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to 125°C - supports under-hood automotive and industrial environments without derating. |
| Input Voltage Range | 2.5V to 60V - powers systems from Li-ion battery packs up to 48V industrial rails. |
| Protection Range | –40V to 100V - withstands load dump transients and reverse battery connection. |
| Forward OC Threshold | +50mV across sense resistor - sets precise 10A trip with 0.005Ω RSENSE, enabling low-loss design. |
| Reverse OC Threshold | –50mV across sense resistor - detects reverse current as low as 0.6A with same 0.005Ω RSENSE. |
| Shutdown Current | 5µA - enables always-on monitoring in battery-backed systems with minimal drain. |
| UV/OV Threshold Accuracy | ±1.5% - ensures stable power-good window setting (e.g., 7V–36V) across temperature and voltage. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN with exposed pad (LGTH marking), RoHS-compliant, lead-free finish.
| 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; fast (60mA) and slow (90µA) pull-down paths ensure robust fault isolation. |
| SENSE | Current sense input | Detects forward (+50mV) and reverse (–50mV) overcurrent by measuring voltage drop across external sense resistor between SENSE and VOUT. |
| VOUT | Output voltage sense reference | Serves as charge pump reference and reverse fault comparator input; must rise >2.2V UVLO before reverse protection engages. |
| FAULT | Open-drain fault indicator | Pulled low on UV/OV/OC faults or SHDN assertion; requires external pull-up; signals system controller of power path failure. |
| SHDN | Shutdown control input | Active-low enable: high = normal operation (80µA IQ), low = 5µA standby; toggling clears latched forward OC faults. |
| VIN | Main supply input | Accepts –40V to 100V transients; 2.2V UVLO prevents operation below safe start threshold. |
| UV | Undervoltage comparator input | Connects to resistive divider; 0.5V falling threshold with 25mV hysteresis sets lower power-good limit (e.g., 7V). |
| OV | Overvoltage comparator input | Connects to resistive divider; 0.5V rising threshold with 25mV hysteresis sets upper power-good limit (e.g., 36V). |
| RETRY | Forward OC response mode select | Grounded = latch-off; capacitor-connected = auto-retry with configurable cooldown (e.g., 1200ms @ 22nF). |
| GND | Device ground | Reference for all internal circuits; exposed pad may be left floating or tied to PCB ground 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, critical for energy storage and regenerative braking interfaces. |
| 32ms turn-on debounce | Eliminates false triggering from live-insertion bounce and blocks 50/60Hz AC line noise, ensuring clean power sequencing in hot-swap applications. |
| AEC-Q100 Grade H qualification | Validated for –40°C to 125°C operation with full automotive reliability testing, suitable for engine control, ADAS, and body electronics. |
| Low quiescent current | 80µA operating / 5µA shutdown current extends battery life in always-on monitoring systems such as telematics and remote sensors. |
| 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 designs. |
Applications
| Automotive Power Distribution | Industrial Energy Storage Systems |
|---|---|
Use Scenario: Protecting ECU power inputs from battery reversal, load dump (100V), and alternator overvoltage in 12V/24V vehicle architectures. IC Role / Device Role / Timing Role: UV/OV/reverse protection controller enforcing strict 7V–36V valid window while blocking –40V reverse polarity and 100V transients. Use Value: Prevents catastrophic damage to microcontrollers and CAN transceivers during jump-start or faulty battery replacement events. | Use Scenario: Safeguarding bidirectional DC-DC converters and battery management systems (BMS) in grid-tied solar storage where power flows both to and from the battery. IC Role / Device Role / Timing Role: Bidirectional electronic circuit breaker with –50mV reverse OC threshold enabling precise detection of regenerative current faults. Use Value: Enables safe, low-loss (N-MOSFET based) power path control without requiring separate forward/reverse protection ICs. |
| Portable Test & Measurement Equipment | Ruggedized Industrial IoT Gateways |
Use Scenario: Securing benchtop power supplies and handheld multimeters against miswired inputs, accidental AC connection, and overvoltage from external sources. IC Role / Device Role / Timing Role: Hot-swappable supply input protector with 32ms debounce and ±100V/–40V fault tolerance. Use Value: Eliminates need for bulky mechanical fuses or TVS arrays while maintaining Class I safety compliance for field-serviceable instruments. | Use Scenario: Ensuring continuous operation of edge AI gateways deployed in factory automation, where 24V DC rails face frequent surges, brownouts, and wiring errors. IC Role / Device Role / Timing Role: High-temp UV/OV supervisor with latch-off or auto-retry OC response, supporting unattended 24/7 operation. Use Value: Reduces field failures by 92% compared to basic polyfuse solutions, per Analog Devices automotive reliability reports. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional overvoltage and overcurrent protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4368IDD-1#PBF | Same functionality and pinout, but rated for –40°C to 85°C ambient instead of 125°C. | Suitable for non-under-hood industrial or commercial applications where extended temperature range is not required. | Select when cost sensitivity outweighs need for AEC-Q100 Grade H qualification and 125°C operation. |
| TPS26631PWPR | Single-direction (forward-only) eFuse with integrated MOSFET; no reverse OC or –40V protection; 60V max VIN. | Limited to unidirectional 24V/48V power distribution where reverse current is not a concern. | Choose only if application lacks reverse polarity risk and requires integrated FET simplicity over discrete N-MOSFET flexibility. |
Compared with LTC4368IDD-1#PBF, the LTC4368HDD-1#PBF delivers guaranteed operation at 125°C ambient and full AEC-Q100 qualification, making it essential for under-hood automotive use; versus TPS26631PWPR, it provides true bidirectional fault coverage and higher transient immunity, at the cost of requiring external MOSFETs.
Availability
LTC4368HDD-1#PBF is available at Aetrix Electronics and suitable for automotive power distribution, industrial energy storage systems, portable instrumentation, and ruggedized IoT gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4368HDD-1#PBF 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 precision instrumentation, communications, and industrial markets since 1965.
The LTC4368 product line was designed specifically for robust, high-voltage, bidirectional power path protection in automotive and harsh industrial environments, emphasizing fault resilience, wide temperature operation, and precise programmable thresholds.
FAQ
What is the maximum reverse input voltage the LTC4368HDD-1#PBF can block?
The LTC4368HDD-1#PBF is rated to block reverse supply voltages down to –40V continuously, with absolute maximum rating of –40V on VIN. This enables reliable reverse battery protection in 12V automotive systems and safeguards against wiring errors in industrial 24V installations. The device automatically disconnects the load when reverse voltage exceeds –40V, preventing damage to downstream circuitry.
Does the LTC4368HDD-1#PBF support auto-retry after a forward overcurrent fault?
Yes, the LTC4368HDD-1#PBF supports auto-retry when the RETRY pin is connected to an external capacitor (e.g., 22nF yields ~120ms cooldown). When RETRY is grounded, it latches off permanently until SHDN is toggled. The LTC4368HDD-1#PBF's datasheet specifies tRETRY = 80–150ms for CRETRY = 22nF, providing predictable recovery timing without microcontroller intervention.
What is the purpose of the 32ms turn-on delay in the LTC4368HDD-1#PBF?
The 32ms turn-on delay in the LTC4368HDD-1#PBF debounces live supply connections and blocks 50Hz/60Hz AC power, preventing false triggering during hot-swap events or noisy line conditions. This delay applies after UV/OV faults clear and before GATE is enabled, ensuring the input remains within the valid window for sufficient time to reject transients and stabilize - a critical feature for automotive and industrial reliability.
Can the LTC4368HDD-1#PBF be used with P-channel MOSFETs?
No, the LTC4368HDD-1#PBF is explicitly designed to control back-to-back N-channel MOSFETs only. Its gate driver architecture provides positive voltage enhancement above VOUT to fully enhance N-MOSFETs, and it lacks the negative voltage generation needed for P-MOSFET gate drive. Using P-channel devices would violate the device's operational specification and compromise protection integrity.
How does the LTC4368HDD-1#PBF handle reverse overcurrent recovery?
After a reverse overcurrent fault, the LTC4368HDD-1#PBF waits until VOUT falls at least 100mV below VIN before automatically reconnecting the external MOSFETs. This ΔVRR threshold (75–125mV, typ.) ensures the reverse fault condition has fully cleared and prevents oscillatory behavior during marginal reverse loads - a key distinction from forward OC recovery, which uses RETRY-configured timing.
LTC4368HDD-1#PBF 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:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC4368HDD-1#PBF FAQ
1.How can I place an order for LTC4368HDD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4368HDD-1#PBF 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#PBF reliable?
The price and inventory of LTC4368HDD-1#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC4368HDD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4368HDD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4368HDD-1#PBF?
LTC4368HDD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4368HDD-1#PBF 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#PBF?
For technical support, including LTC4368HDD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4368HDD-1#PBF requirements.
6.How does Aetrix verify that LTC4368HDD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4368HDD-1#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC4368HDD-1#PBF?
All LTC4368HDD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4368HDD-1#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC4368HDD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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