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Analog Devices Inc. LTC4373CDD#PBF
- Part No.:
- LTC4373CDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4373CDD#PBF.pdf
- Description:
- LOW ICC IDEAL DIODE CONTROLLER W
- Quantity:
- Payment:
- Shipping:
Inventory:1,607
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Product details
Overview
LTC4373CDD#PBF from Analog Devices is a positive high-voltage ideal diode controller that drives an external N-channel MOSFET to replace Schottky diodes in redundant power paths. It features 5µA operating quiescent current, 2.5V–80V input voltage range, reverse supply protection to –28V, and undervoltage monitoring via UV/UVOUT pins - enabling robust battery protection and backup power holdup in automotive and portable instrumentation.
For engineers reviewing the LTC4373CDD#PBF datasheet, LTC4373CDD#PBF pinout, LTC4373CDD#PBF application, or LTC4373CDD#PBF equivalent, this page delivers verified specifications, validated pin functions, confirmed MOSFET drive behavior, and real-world design implications for reverse-current turn-off, UV hysteresis configuration, and back-to-back MOSFET inrush control.
Technical Context
The LTC4373CDD#PBF implements pulsed gate control using a 2MHz charge pump to regulate forward voltage drop (ΔVSD) across the external N-MOSFET to ≤30mV while maintaining ultra-low IQ. Its UV comparator monitors an external resistive divider and asserts UVOUT (open-drain) when input falls below 1.191V with 80mV hysteresis.
During reverse current events, the device pulls GATE to SOURCE within 0.5µs using a 130mA internal pull-down, isolating load from faulted inputs. It supports both single-MOSFET and back-to-back configurations for inrush limiting and bidirectional blocking, with IN/SOURCE/GATE rated for –28V to 100V absolute maximum stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 2.5V to 80V input supply - enables direct use across 12V automotive, 24V industrial, and 48V telecom rails without level-shifting. |
| Quiescent Current (IQ) | 5µA typical operating current - sustains efficiency in always-on backup supplies and energy-harvesting systems with intermittent loads. |
| Undervoltage Threshold (VUV) | 1.191V (min 1.174V, max 1.208V) - sets precise UVLO activation point for input monitoring with external resistor divider scaling. |
| Reverse Current Turn-Off Time | ≤1.5µs - ensures rapid MOSFET shutdown during input shorts or reverse battery events, minimizing output bus disturbance. |
| Gate Drive Voltage (ΔVGATE(H)) | 10V (typ) at VIN >5V - provides sufficient overdrive for standard 10V-threshold N-MOSFETs while clamped to 16V max GATE–SOURCE. |
| Package Thermal Resistance (θJA) | 43°C/W (DD package) - supports 20A continuous operation with moderate PCB copper area and no forced airflow. |
| Operating Temperature Range | 0°C to 70°C - qualified for commercial-grade applications including portable test equipment and solar charge controllers. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN (DD package) with optional exposed pad connected to GND. Thermal performance optimized for surface-mount power management on compact PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Voltage sense and supply input | Anode-side sensing node; withstands –28V to 100V; used for forward regulation and reverse-current detection. |
| SOURCE | MOSFET source return path | Direct connection to MOSFET source; enables fast GATE–SOURCE pull-down during faults; rated –28V to 100V. |
| GATE | N-MOSFET gate drive output | Charge-pump-driven output; clamped to +16V above SOURCE or –28V below GND; drives external N-FET gate. |
| OUT | Drain voltage sense and output node | Cathode-side sensing; common OR-ing bus node; holds MOSFET off when IN is absent (via internal hold-up). |
| UV | Undervoltage detection input | High-impedance comparator input; connects to external resistor divider; triggers shutdown when voltage drops below 1.191V. |
| UVOUT | UV status open-drain output | Pulls low during undervoltage; configurable hysteresis via external resistor to UV; usable as system fault indicator. |
| GND | Device ground reference | Signal and power ground; exposed pad (Pin 9) may be tied to GND for improved thermal and EMI performance. |
| INTVCC | Internal 3V regulator output | Decoupling node requiring ≥0.1µF capacitor; supplies internal circuitry and can power light external loads (<10µA). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 5µA typical supply current enables multi-year battery life in always-on backup power and energy harvesting nodes. |
| Programmable UV lockout | External resistor divider sets precise undervoltage threshold (1.191V) with adjustable hysteresis via UVOUT feedback. |
| Back-to-back MOSFET support | Simultaneous control of two N-MOSFETs enables inrush limiting, load switching, and bidirectional blocking without extra ICs. |
| Reverse battery protection | Withstands –28V at IN/SOURCE/GATE and actively disconnects load via sub-1.5µs GATE turn-off during reverse polarity events. |
| No TVS clamps required | Integrated GND–GATE clamp and fast reverse-current response eliminate need for external TVS diodes in most 12V/24V systems. |
Applications
| Automotive Battery Protection | Redundant Power Supplies |
|---|---|
Use Scenario: 12V vehicle electrical system with dual-battery jump-start capability and reverse-connection risk. IC Role / Device Role / Timing Role: Ideal diode controller enforcing unidirectional current flow and disabling MOSFET within 1.5µs during reverse polarity or short-circuit. Use Value: Prevents damage to ECUs and infotainment modules during jump-starts or accidental battery reversal; eliminates Schottky heat sink requirements. |
Use Scenario: Dual 24V DC power supplies feeding shared load in industrial PLC or telecom shelf. IC Role / Device Role / Timing Role: OR-ing controller managing load sharing and automatic switchover when primary supply fails. Use Value: Enables seamless failover with <1.5µs reverse-current cutoff, avoiding bus collapse and ensuring uptime without manual intervention. |
| Solar Powered Systems | Portable Instrumentation |
Use Scenario: Off-grid solar charge controller with battery backup and MPPT input, subject to variable irradiance and cold crank transients. IC Role / Device Role / Timing Role: Input protection and holdup controller maintaining regulated output during solar panel shading or battery disconnection. Use Value: Sustains operation through micro-outages using stored energy; 5µA IQ extends runtime between sun cycles in low-power data loggers. |
Use Scenario: Handheld multimeter or portable oscilloscope powered by rechargeable Li-ion with USB and battery inputs. IC Role / Device Role / Timing Role: Dual-input power selector enforcing priority charging and preventing backfeed between sources. Use Value: Eliminates cross-conduction and thermal stress in compact enclosures; supports USB-C PD negotiation without compromising safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ideal diode controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4372CDD#PBF | Lacks UV/UVOUT pins; uses SHDN/2UPU instead; 3.5µA shutdown IQ vs 0.5µA for LTC4373. | Suitable for ON/OFF-controlled systems without input voltage monitoring; no hysteresis adjustment capability. | Select when undervoltage supervision is unnecessary and simpler control interface is preferred. |
| TPS2410DRCT | Fixed 2.5V UVLO threshold; no programmable hysteresis; higher 12µA operating IQ; supports only single-MOSFET topology. | Targeted at cost-sensitive telecom OR-ing where precision UV monitoring is not required. | Choose for basic redundancy in fixed-rail systems where BOM cost outweighs flexibility and ultra-low IQ. |
Compared with LTC4372CDD#PBF and TPS2410DRCT, the LTC4373CDD#PBF uniquely combines programmable undervoltage detection, 0.5µA shutdown current, and back-to-back MOSFET support - making it optimal for battery-backed, automotive, and solar applications demanding both precision supervision and robust fault handling.
Availability
LTC4373CDD#PBF is available at Aetrix Electronics and suitable for automotive battery protection, redundant power supplies, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC4373CDD#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 industrial, automotive, communications, and healthcare markets with precision power and interface solutions.
The LTC4373 belongs to Analog Devices' ideal diode controller product line, engineered specifically for high-voltage, low-IQ OR-ing and reverse-protection applications in harsh environments such as automotive and renewable energy systems.
FAQ
What is the function of the UV and UVOUT pins on the LTC4373CDD#PBF?
The UV pin on the LTC4373CDD#PBF serves as a high-impedance input for an external resistive divider to monitor input supply voltage. When the divided voltage falls below 1.191V, the device enters low-current shutdown mode. The UVOUT pin is an open-drain output that pulls low during undervoltage conditions and can be used to configure external hysteresis or signal system fault status - both functions are fully supported and validated for the LTC4373CDD#PBF.
Can the LTC4373CDD#PBF drive back-to-back N-channel MOSFETs, and what is the design impact?
Yes, the LTC4373CDD#PBF explicitly supports back-to-back N-channel MOSFET configurations for inrush current limiting and bidirectional blocking. In this mode, the device controls both MOSFET gates to prevent shoot-through and ensure safe turn-on/turn-off sequencing. Confirmed quiescent current drops to 0.5µA in shutdown, and reverse-current turn-off remains ≤1.5µs - critical for protecting downstream loads during hot-swap or fault events involving the LTC4373CDD#PBF.
What is the maximum reverse voltage the LTC4373CDD#PBF can withstand at the IN pin?
The LTC4373CDD#PBF is rated for –28V at the IN, SOURCE, and GATE pins per Absolute Maximum Ratings. This specification is validated across temperature and ensures reliable operation during reverse battery connections or negative transients in automotive and industrial environments - a key design parameter confirmed for the LTC4373CDD#PBF in its official datasheet Rev. A.
How does the LTC4373CDD#PBF achieve 5µA quiescent current while regulating forward voltage?
The LTC4373CDD#PBF achieves 5µA typical operating current using pulsed gate control: its internal 2MHz charge pump activates only periodically to recharge the MOSFET gate, minimizing average supply draw. Gate leakage, load current, and external capacitance determine pulse frequency - confirmed in Typical Performance Characteristics (Fig. G01–G03) for the LTC4373CDD#PBF under real operating conditions.
Is the LTC4373CDD#PBF pin-compatible with the LTC4372CDD#PBF?
No, the LTC4373CDD#PBF is not pin-compatible with the LTC4372CDD#PBF. While both use the same 8-lead DFN (DD) package, their pin assignments differ: LTC4373CDD#PBF uses UV and UVOUT pins (replacing SHDN and 2UPU on LTC4372CDD#PBF). This functional and physical incompatibility is documented in the Pin Configuration diagrams of the LTC4372/LTC4373 Rev. A datasheet for the LTC4373CDD#PBF.
LTC4373CDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- N+1 ORing Controller
- FET Type:
- N-Channel
- Ratio - Input:Output:
- 1:1
- Internal Switch(s):
- No
- Delay Time - ON:
- 500 µs
- Delay Time - OFF:
- 500 ns
- Current - Output (Max):
- 10µA
- Current - Supply:
- 5 µA
- Voltage - Supply:
- 2.5V ~ 80V
- Applications:
- Redundant Power Supplies
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC4373CDD#PBF FAQ
1.How can I place an order for LTC4373CDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4373CDD#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 LTC4373CDD#PBF reliable?
The price and inventory of LTC4373CDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4373CDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4373CDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4373CDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4373CDD#PBF?
LTC4373CDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4373CDD#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 LTC4373CDD#PBF?
For technical support, including LTC4373CDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4373CDD#PBF requirements.
6.How does Aetrix verify that LTC4373CDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4373CDD#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 LTC4373CDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4373CDD#PBF?
All LTC4373CDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4373CDD#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 LTC4373CDD#PBF part is unused and in its original packaging.
Return procedure for LTC4373CDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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