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Analog Devices Inc. LTC4373IMS8#PBF
- Part No.:
- LTC4373IMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4373IMS8#PBF.pdf
- Description:
- LOW ICC IDEAL DIODE CONTROLLER W
- Quantity:
- Payment:
- Shipping:
Inventory:4,054
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Product details
Overview
LTC4373IMS8#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. It enables low-loss OR-ing in automotive battery protection and solar backup systems.
For engineers reviewing the LTC4373IMS8#PBF datasheet, LTC4373IMS8#PBF pinout, LTC4373IMS8#PBF application, or LTC4373IMS8#PBF equivalent, key selection criteria include UV threshold accuracy (1.191V), fast 1.5µs reverse-current turn-off, back-to-back MOSFET support for inrush control, and MS8 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The LTC4373IMS8#PBF implements pulsed gate control using a 2MHz charge pump to regulate forward voltage drop (∆VSD) between IN and OUT to ≤30mV. Its internal UV comparator triggers shutdown at 1.191V with 15mV hysteresis, reducing IQ to 0.5µA while cutting off back-to-back MOSFETs.
It integrates GATE pull-up (–25µA typ) and pull-down (130mA typ) circuits, supports reverse-battery detection down to –28V at IN/SOURCE, and uses SOURCE-referenced GATE drive with clamped ∆VGATE up to 11.7V (IN > 5V) or 6.5V (IN ≤ 5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 2.5V to 80V - supports automotive load-dump and cold-crank conditions without external regulation. |
| Quiescent Current (IQ) | 5µA typ - enables multi-year battery life in always-on backup power supplies. |
| UV Threshold | 1.191V (min 1.174V, max 1.208V) - precise undervoltage lockout for stable system brown-out response. |
| Reverse Turn-Off Time | 1.5µs max - limits reverse current transients during input short-circuit or supply failure. |
| Forward Voltage Regulation | ≤30mV - reduces conduction loss vs. Schottky diodes, especially at low VIN where headroom is critical. |
| Package | 8-Lead Plastic MSOP - surface-mount footprint compatible with automated assembly and thermal relief via exposed pad (optional GND connection). |
| Temperature Range | –40°C to +85°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8), 3.0mm × 3.0mm body, 0.65mm pitch, exposed thermal pad (optional GND connection). Pin 1 marked by dot; top-view orientation per datasheet Rev. A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT | Cathode voltage sense / output node | Connects to MOSFET drain; senses output bus for forward regulation and reverse-current detection. |
| GATE | MOSFET gate drive output | Drives external N-channel MOSFET gate with pulsed 2MHz charge pump; clamped to ≤11.7V above SOURCE. |
| SOURCE | MOSFET source reference / fast pull-down return | Must be tied directly to MOSFET source; provides return path for 130mA GATE-to-SOURCE pull-down during reverse events. |
| IN | Anode voltage sense / supply input | Senses input voltage for UVLO and forward regulation; withstands –28V reverse without damage. |
| UV | Undervoltage monitor input | Accepts resistive divider from IN; triggers shutdown when voltage falls below 1.191V. |
| UVOUT | Open-drain UV status output | Pulls low when UV < 1.191V; used for system fault signaling or external hysteresis configuration. |
| GND | Device ground reference | Reference for all internal comparators and regulators; connects to PCB ground plane. |
| INTVCC | Internal 3V regulator output | Provides decoupled 3V supply; requires ≥0.1µF capacitor; supports ≤10µA external loads. |
Key Features
| Feature | Design Value |
|---|---|
| Back-to-back MOSFET control | Enables inrush limiting and bidirectional load switching without external logic or timing components. |
| Reverse battery protection | Withstands –28V at IN/SOURCE while actively disconnecting load via GATE-to-SOURCE pull-down. |
| No TVS input clamps required | Integrated GND–GATE clamp (–32V typ) eliminates need for external transient suppressors in most 12V/24V systems. |
| Pulsed gate control | Reduces average IQ to ~5µA by waking charge pump only as needed to maintain ∆VSD ≤30mV. |
| UVOUT hysteresis adjustability | External resistor between UV and UVOUT overrides internal 15mV hysteresis for custom brown-out recovery windows. |
Applications
| Automotive Battery Protection | Redundant Power Supplies |
|---|---|
Use Scenario: Dual-battery system in commercial vehicle with jump-start and reverse-connection risk. IC Role / Device Role / Timing Role: Ideal diode controller enforcing unidirectional current flow from primary to secondary battery while blocking reverse discharge. Use Value: Eliminates 0.3–0.5V Schottky forward drop, reducing heat generation by >80% at 20A and enabling compact layout without heatsinks. | Use Scenario: OR-ing two 12V DC supplies in telecom shelf with failover requirement. IC Role / Device Role / Timing Role: Controls external N-MOSFETs to enable seamless switchover within 1.5µs upon primary supply failure. Use Value: Prevents reverse current injection into failed supply, avoiding bus collapse and enabling hot-swap capability. |
| Solar Powered Systems | Energy Harvesting Applications |
Use Scenario: Off-grid solar charge controller feeding battery and load simultaneously with backup battery input. IC Role / Device Role / Timing Role: Manages power path from PV panel, main battery, and backup battery using three independent LTC4373 channels. Use Value: Maintains system uptime during low-light conditions via automatic source selection with <30mV conduction loss. | Use Scenario: Wireless sensor node powered by thermoelectric generator with supercapacitor buffer. IC Role / Device Role / Timing Role: Isolates energy harvester output from storage capacitor during low-output periods to prevent leakage. Use Value: 0.5µA shutdown IQ extends usable runtime by months when harvester is inactive, preserving stored energy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ideal diode controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4373HMS8#PBF | Same functionality but rated for –40°C to +125°C junction temperature; higher θJA (163°C/W) and same MS8 package. | Required for under-hood automotive or high-ambient industrial use; not necessary for standard industrial environments. | Select LTC4373IMS8#PBF for cost-sensitive designs operating within –40°C to +85°C ambient. |
| LTC4372IMS8#PBF | Replaces UV/UVOUT with SHDN/2UPU pins; lacks undervoltage monitoring; 3.5µA shutdown IQ vs. 0.5µA. | Suitable for ON/OFF-controlled systems without input voltage supervision; cannot replace LTC4373IMS8#PBF in UV-monitored designs. | Choose LTC4372IMS8#PBF only if UV monitoring is unnecessary and lower BOM count is prioritized over ultra-low shutdown IQ. |
Compared with LTC4373HMS8#PBF, the LTC4373IMS8#PBF offers identical electrical performance at lower cost for industrial-grade thermal requirements; compared with LTC4372IMS8#PBF, it adds precision UV monitoring and cuts shutdown current by 7x - critical for battery-backed holdup applications.
Availability
LTC4373IMS8#PBF is available at Aetrix Electronics and suitable for automotive battery protection, redundant power supplies, and solar-powered systems requiring stable component supply across extended temperature operation and long product lifecycles.
Supply support for LTC4373IMS8#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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.
The LTC4373 belongs to Analog Devices' ideal diode controller product line, designed specifically to replace power Schottky diodes in high-reliability OR-ing, reverse-protection, and inrush-control applications across 2.5V–80V domains.
FAQ
What is the UV threshold voltage of the LTC4373IMS8#PBF?
The LTC4373IMS8#PBF has a nominal UV threshold of 1.191V, with guaranteed minimum and maximum values of 1.174V and 1.208V respectively across the full –40°C to +85°C operating temperature range. This precision threshold enables reliable undervoltage detection without external calibration, and the UVOUT pin provides open-drain status feedback synchronized to the UV event.
How does the LTC4373IMS8#PBF achieve 5µA quiescent current?
The LTC4373IMS8#PBF achieves 5µA typical operating IQ through pulsed gate control: its internal 2MHz charge pump activates only intermittently to recharge the MOSFET gate and maintain ∆VSD ≤30mV, spending most time in low-power sleep mode. During shutdown (UV < 1.191V), IQ drops further to 0.5µA by disabling gate drive and cutting off back-to-back MOSFETs.
Can the LTC4373IMS8#PBF drive back-to-back N-channel MOSFETs?
Yes, the LTC4373IMS8#PBF explicitly supports back-to-back N-channel MOSFET configurations for inrush current limiting and bidirectional load switching. When enabled, it controls both MOSFETs synchronously using the same GATE output, and cuts off both devices during undervoltage or reverse-current events to isolate the load completely.
What is the maximum reverse voltage the LTC4373IMS8#PBF can withstand at the IN pin?
The LTC4373IMS8#PBF guarantees safe operation with –28V applied to the IN pin, as specified in Absolute Maximum Ratings. This rating covers reverse battery connections and negative transients in automotive and industrial environments. The internal GND–GATE clamp activates at –32V (typ), preventing damage while enabling active reverse-current cutoff.
Is the MS8 package of the LTC4373IMS8#PBF RoHS-compliant and lead-free?
Yes, the LTC4373IMS8#PBF carries the #PBF suffix, indicating it is Pb-free (lead-free) and RoHS-compliant per Analog Devices' packaging standards. The MS8 package uses matte tin finish on leads and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/85% RH.
LTC4373IMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC4373IMS8#PBF FAQ
1.How can I place an order for LTC4373IMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4373IMS8#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 LTC4373IMS8#PBF reliable?
The price and inventory of LTC4373IMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4373IMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC4373IMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4373IMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4373IMS8#PBF?
LTC4373IMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4373IMS8#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 LTC4373IMS8#PBF?
For technical support, including LTC4373IMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4373IMS8#PBF requirements.
6.How does Aetrix verify that LTC4373IMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4373IMS8#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 LTC4373IMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC4373IMS8#PBF?
All LTC4373IMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4373IMS8#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 LTC4373IMS8#PBF part is unused and in its original packaging.
Return procedure for LTC4373IMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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