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Analog Devices Inc. LTC4368HDD-1#WPBF
- Part No.:
- LTC4368HDD-1#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4368HDD-1#WPBF.pdf
- Description:
- 100V UV/OV & REVERSE PROT CNTR
- Quantity:
- Payment:
- Shipping:
Inventory:4,522
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Product details
Overview
LTC4368HDD-1#WPBF 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 protection, features +50mV forward and –50mV reverse current sense thresholds (LTC4368-1 variant), and controls back-to-back N-channel MOSFETs in harsh environments such as energy storage systems and 12V/24V vehicle electronics.
For engineers reviewing the LTC4368HDD-1#WPBF datasheet, LTC4368HDD-1#WPBF pinout, LTC4368HDD-1#WPBF application, or LTC4368HDD-1#WPBF equivalent, key selection criteria include its AEC-Q100 qualification (–40°C to 125°C), 5µA shutdown current, 32ms turn-on delay for AC blocking, and precise ±1.5% adjustable UV/OV thresholds - all critical for robust hot-swap and surge-prone supply interfaces.
Technical Context
The LTC4368HDD-1#WPBF implements dual fast comparators (1µs propagation) with 25mV hysteresis on UV and OV inputs, enabling accurate windowed voltage supervision. Its gate drive architecture uses an internal charge pump delivering up to 13.1V enhancement above VOUT, supporting low-RDS(on) N-MOSFETs while maintaining fast turn-off via 60mA GATE pull-down sinks during faults.
It integrates bidirectional overcurrent detection: forward fault at ΔVSENSE = +50mV (typ), reverse fault at ΔVSENSE = –50mV (LTC4368-1), and automatic re-enable after reverse fault when VIN – VOUT ≥ 75mV (min). The 32ms recovery delay debounces live connections and blocks 50/60Hz AC, while RETRY pin configures latch-off or auto-retry behavior for forward overcurrent events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 2.5V to 60V - supports standard 12V/24V/48V DC systems without external regulation |
| Protection Range | –40V to +100V - withstands automotive load dump, reverse battery, and AC line transients |
| Forward OC Threshold | +50mV across sense resistor - sets precise current limit (e.g., 10A with 5mΩ RSENSE) |
| Reverse OC Threshold | –50mV across sense resistor - enables symmetric reverse-current blocking per LTC4368-1 spec |
| UV/OV Threshold Accuracy | ±1.5% - ensures stable power-good window under temperature and supply variation |
| Shutdown Current | 5µA max - enables ultra-low-power standby in always-on automotive modules |
| Temperature Range | –40°C to +125°C - qualified for engine bay and industrial control cabinet deployment |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN with exposed pad (LGTH marking); RoHS-compliant, lead-free finish, tape-and-reel packaging.
| 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/slow turn-off paths ensure controlled disconnect |
| SENSE | Current sense input | Detects bidirectional overcurrent via voltage drop across external sense resistor; –50mV threshold enables reverse polarity blocking |
| VOUT | Output voltage sense | Reference point for GATE charge pump and reverse fault comparator; requires ≥1µF local bypass |
| FAULT | Open-drain fault indicator | Pulled low on UV/OV/OC/SHDN fault or VIN < UVLO; signals system controller to isolate supply |
| SHDN | Shutdown control input | Active-low enable; toggling clears latched forward OC fault; must stay ≤80V when VIN > 80V |
| VIN | Main supply input | Accepts –40V to +100V; includes 2.2V UVLO; supports hot-swap up to 24V without damage |
| UV | Undervoltage comparator input | Connects to resistive divider; 0.5V falling threshold with 25mV hysteresis enables precise low-voltage cutoff |
| OV | Overvoltage comparator input | Connects to resistive divider; 0.5V rising threshold with 25mV hysteresis enables precise overvoltage cutoff |
| RETRY | Forward OC recovery mode select | Grounded = latch-off; capacitor-connected = auto-retry with 5.5ms/nF cooldown delay |
| GND | Device ground reference | Return path for all internal circuits; exposed pad may be connected to PCB ground for thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional circuit breaker | +50mV forward / –50mV reverse current sensing enables full protection against both supply-to-load and load-to-supply faults |
| AEC-Q100 Grade H qualification | Rated for –40°C to +125°C ambient operation with full electrical characterization - suitable for under-hood automotive use |
| 32ms turn-on delay | Debounces noisy supply connections and inherently blocks 50Hz/60Hz AC mains - eliminates need for external AC rejection circuitry |
| Low quiescent current | 80µA operating / 5µA shutdown current minimizes parasitic drain in battery-backed systems |
| Adjustable ±1.5% UV/OV thresholds | Configurable via external resistor dividers with <1nA input leakage - enables stable windows across wide temperature ranges |
| Back-to-back N-MOSFET control | Eliminates body diode conduction path - prevents reverse current flow and enables true bidirectional blocking |
Applications
| Automotive Power Distribution | Industrial Energy Storage Systems |
|---|---|
Use Scenario: Protecting infotainment head units and ADAS ECUs from reverse battery connection, load dump spikes, and alternator ripple in 12V/24V vehicle architectures. IC Role / Device Role / Timing Role: Primary UV/OV/reverse/current fault supervisor controlling external N-MOSFETs in main power rail; enforces 32ms power-good holdoff before enabling load. Use Value: Prevents catastrophic failure during jump-starts or service errors; AEC-Q100 H-grade ensures reliability at 125°C under hood. |
Use Scenario: Safeguarding lithium-ion battery management systems (BMS) and DC-DC converters from grid surges, regenerative braking feedback, and cell imbalance currents. IC Role / Device Role / Timing Role: Bidirectional circuit breaker isolating battery pack from charger/inverter; detects reverse current during discharge-to-charge transitions. Use Value: Enables safe hot-plug of modular battery packs; –50mV reverse threshold ensures rapid disconnect before cell reversal occurs. |
| Portable Test Equipment | Ruggedized IoT Gateways |
Use Scenario: Securing handheld multimeters, oscilloscopes, and signal generators against miswired probes, accidental AC coupling, and ESD-induced supply faults. IC Role / Device Role / Timing Role: Input protection controller placed upstream of LDOs and ADC references; blocks transients before they corrupt precision analog front-ends. Use Value: Maintains measurement integrity by rejecting >100V spikes and limiting inrush into large input capacitors via slew-controlled GATE drive. |
Use Scenario: Hardening edge computing gateways deployed in factory automation, where 24V DC supplies face frequent short-circuits, lightning-induced surges, and cable EMI. IC Role / Device Role / Timing Role: First-line defense in power entry module; coordinates with downstream PMICs via FAULT signal to initiate graceful shutdown. Use Value: Extends field lifetime by eliminating single-event burnout; 5µA shutdown current supports battery backup during brownouts. |
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#WPBF | –3mV reverse OC threshold vs –50mV; otherwise identical specs and pinout | Better suited for low-voltage reverse-current detection (e.g., USB PD sink/source switching) | Select LTC4368HDD-2#WPBF only if sub-10mV reverse trip is required; LTC4368HDD-1#WPBF provides stronger reverse blocking margin |
| TPS26631RHFR | Single-direction (forward-only) protection; no reverse voltage/current handling; integrated MOSFET; 4.5V–60V range | Lacks reverse battery and AC blocking capability; not AEC-Q100 qualified; lower BOM count but limited fault coverage | Choose TPS26631RHFR only for cost-sensitive, forward-only applications where reverse faults are physically impossible |
Compared with LTC4368HDD-2#WPBF, the LTC4368HDD-1#WPBF delivers superior reverse fault immunity due to its –50mV threshold, making it preferred for automotive and energy storage. Versus TPS26631RHFR, it trades integration for comprehensive bidirectional protection and automotive qualification - essential where reverse polarity or AC exposure is possible.
Availability
LTC4368HDD-1#WPBF is available at Aetrix Electronics and suitable for automotive power distribution, industrial energy storage systems, and ruggedized IoT gateways requiring stable component supply across extended temperature and high-reliability environments.
Supply support for LTC4368HDD-1#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, 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 robust, integrated protection controllers for demanding DC power rails - designed specifically for automotive AEC-Q100 compliance, industrial surge resilience, and bidirectional fault containment in battery and grid-connected systems.
FAQ
What is the reverse current sense threshold for LTC4368HDD-1#WPBF?
The LTC4368HDD-1#WPBF uses a –50mV reverse current sense threshold (ΔVSENSE = SENSE – VOUT), as specified in the LTC4368-1 variant family. This enables reliable detection of reverse current flow from load to source, triggering immediate GATE turn-off. The threshold is fixed and not adjustable - distinct from the LTC4368-2 variant's –3mV setting. This value is confirmed in the Electrical Characteristics table on page 3 of the Rev. C datasheet.
Does LTC4368HDD-1#WPBF support AEC-Q100 qualification?
Yes, LTC4368HDD-1#WPBF is explicitly AEC-Q100 qualified for automotive applications, rated for operation from –40°C to +125°C ambient temperature. The "H" grade designation and "#WPBF" suffix denote automotive-grade packaging and controlled manufacturing. This qualification is documented in the Order Information table (page 2) and Automotive Products section (page 3) of the datasheet.
What package type and footprint does LTC4368HDD-1#WPBF use?
LTC4368HDD-1#WPBF uses a 10-lead (3mm × 3mm) plastic DFN package with exposed pad (marked LGTH), as stated in the Order Information table. It is pin-compatible with other LTC4368 DFN variants (e.g., LTC4368IDD-1#PBF) and shares the same land pattern. The exposed pad may be left unconnected or tied to PCB ground for improved thermal performance.
How does the 32ms turn-on delay function in LTC4368HDD-1#WPBF?
The 32ms turn-on delay in LTC4368HDD-1#WPBF enforces a mandatory power-good holdoff period after UV/OV faults clear or at initial power-up. During this time, GATE remains off even if VIN enters the valid window - preventing chatter from noisy supplies and inherently blocking 50Hz/60Hz AC input. This delay is fixed and non-adjustable, as verified in the Block Diagram (page 8) and Applications Information (page 11).
Can LTC4368HDD-1#WPBF protect against AC power sources?
Yes, LTC4368HDD-1#WPBF blocks 50Hz and 60Hz AC power by design, thanks to its 32ms turn-on delay and fast UV/OV comparators. When AC is applied, the input voltage repeatedly crosses the UV/OV thresholds, preventing the GATE from ever enabling long enough to power the load. This behavior is explicitly cited in the FEATURES list and validated in Figure 17 (AC Blocking) on page 6 of the datasheet.
LTC4368HDD-1#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)
LTC4368HDD-1#WPBF FAQ
1.How can I place an order for LTC4368HDD-1#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4368HDD-1#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 LTC4368HDD-1#WPBF reliable?
The price and inventory of LTC4368HDD-1#WPBF 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#WPBF is usually 5 days.
3.What payment methods are accepted for LTC4368HDD-1#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4368HDD-1#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4368HDD-1#WPBF?
LTC4368HDD-1#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4368HDD-1#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 LTC4368HDD-1#WPBF?
For technical support, including LTC4368HDD-1#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4368HDD-1#WPBF requirements.
6.How does Aetrix verify that LTC4368HDD-1#WPBF is sourced from the original manufacturer or authorized distributors?
All LTC4368HDD-1#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 LTC4368HDD-1#WPBF meets industry standards.
7.What is the process for return or replacement of LTC4368HDD-1#WPBF?
All LTC4368HDD-1#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4368HDD-1#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 LTC4368HDD-1#WPBF part is unused and in its original packaging.
Return procedure for LTC4368HDD-1#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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