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Analog Devices Inc. LTC2931HF#PBF
- Part No.:
- LTC2931HF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LTC2931HF#PBF.pdf
- Description:
- IC 6 PWR SUPPLY MONITOR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:134
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Product details
Overview
LTC2931HF#PBF from Analog Devices (formerly Linear Technology) is a configurable six-supply voltage monitor IC with adjustable reset and watchdog timers, ±1.5% threshold accuracy over temperature, 52μA quiescent current, and guaranteed RST operation down to VCC = 1V. It supports 16 preset combinations of 5V/3.3V/3V/2.5V/1.8V/1.5V plus adjustable thresholds and is used in multivoltage telecom servers requiring precise brownout detection and system-level fault isolation.
For engineers reviewing the LTC2931HF#PBF datasheet, LTC2931HF#PBF pinout, LTC2931HF#PBF application, or LTC2931HF#PBF equivalent, key selection criteria include its –40°C to 125°C operating range, 20-lead TSSOP package, individual open-drain comparator outputs per supply, external capacitor–programmable reset/watchdog timeouts, and VPG-based mode selection for flexible multirail monitoring.
Technical Context
The LTC2931HF#PBF implements six independent high-impedance voltage comparators with user-selectable thresholds via a resistive divider on VPG, referencing either internal 1.210V VREF or ground for negative-adjust modes. Each comparator drives an open-drain output (COMP1–COMP6) with weak 6μA internal pull-up to V2.
Reset timing (tRST = 2–4 ms/nF on CRT) and watchdog timeout (tWD = 20–40 ms/nF on CWT) are independently set by external capacitors. The RST output remains valid down to VCC = 1V, and WDI edge-triggering clears the watchdog timer only when RST is high - ensuring fail-safe behavior during power-up and brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +125°C - qualified for automotive under-hood and industrial high-temp environments |
| Supply Current | 52μA typical - enables use in always-on battery-backed systems without significant drain |
| Threshold Accuracy | ±1.5% over full temp range - reduces system voltage margin requirements vs. ±2.5% alternatives |
| Reset Timeout Range | 2 ms/nF on CRT pin - supports 25μs min to >1 s max with standard ceramic caps |
| Watchdog Timeout Range | 20 ms/nF on CWT pin - allows software execution window tuning from 200μs to >1 s |
| VCC Minimum for RST | 1V - ensures deterministic reset assertion during deep brownout before logic rails collapse |
| VREF Output | 1.210V ±18 mV - stable buffered reference for mode selection and negative-adjust biasing |
Pinout & Package
Package: 20-lead plastic TSSOP (F package), 4.4 mm × 6.5 mm, 0.65 mm pitch, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP5 (1) | Comparator Output 5 | Open-drain status signal for V5 input; pulled up weakly to V2; asserts low when V5 < threshold |
| V5 (2) | Adjustable Voltage Input 5 | High-impedance input with 0.5V nominal threshold; supports positive ADJ configuration only |
| COMP3 (3) | Comparator Output 3 | Open-drain status signal for V3 input; pulled up weakly to V2; asserts low when V3 < threshold |
| COMP1 (4) | Comparator Output 1 | Open-drain status signal for V1 input; pulled up weakly to V2; asserts low when V1 < threshold |
| V3 (5) | Voltage Input 3 | Selectable threshold: 2.5V / 1.8V / 1.5V / ADJ; tied to V1 if unused |
| V1 (6) | Voltage Input 1 | Selectable threshold: 5V / 3.3V; greater of V1/V2 defines internal VCC; bypass required |
| CRT (7) | Reset Timeout Capacitor | Connect capacitor to GND to set tRST = 2 ms/nF; open = ~25μs min delay |
| RST (8) | Reset Output | Open-drain active-low reset; guaranteed valid down to VCC = 1V; pulled up weakly to V2 |
| WDO (9) | Watchdog Output | Open-drain active-low watchdog flag; toggles if WDI not strobed within tWD; pulled up weakly to V2 |
| WDI (10) | Watchdog Input | Edge-triggered clear input; rising/falling edge resets watchdog timer when RST is high |
| CWT (11) | Watchdog Timeout Capacitor | Connect capacitor to GND to set tWD = 20 ms/nF; grounded = watchdog disabled |
| GND (12) | Ground Reference | Analog and digital return path; decoupling required at V1/V2 pins |
| VPG (13) | Threshold Select Input | Resistive divider tap between VREF and GND selects one of 16 voltage combinations |
| VREF (14) | Buffered Reference Output | 1.210V ±18 mV; sources/sinks ±1 mA; drives VPG divider and negative-adjust circuits |
| V4 (15) | Voltage Input 4 | Selectable threshold: 1.8V / 1.5V / ADJ / –ADJ; supports negative voltage monitoring in –ADJ mode |
| V2 (16) | Voltage Input 2 | Selectable threshold: 3.3V / 3V / 2.5V; greater of V1/V2 defines internal VCC; bypass required |
| COMP4 (17) | Comparator Output 4 | Open-drain status signal for V4 input; pulled up weakly to V2; asserts low when V4 < threshold |
| COMP2 (18) | Comparator Output 2 | Open-drain status signal for V2 input; pulled up weakly to V2; asserts low when V2 < threshold |
| V6 (19) | Adjustable Voltage Input 6 | High-impedance input with 0.5V nominal threshold; supports positive ADJ configuration only |
| COMP6 (20) | Comparator Output 6 | Open-drain status signal for V6 input; pulled up weakly to V2; asserts low when V6 < threshold |
Key Features
| Feature | Design Value |
|---|---|
| 16 Preset Voltage Combinations | Reduces BOM count and design time by eliminating need for multiple fixed-threshold supervisors |
| Individual Comparator Outputs | Enables per-rail fault diagnosis and sequencing control without external logic or ADC |
| Adjustable Reset & Watchdog Timers | Eliminates need for fixed RC networks or programmable timers - simplifies layout and validation |
| Glitch-Immune Comparators | Prevents false resets from transient noise on supply rails, reducing system reliability risk |
| –40°C to +125°C Operation | Validated for extended-temperature applications including automotive engine control and industrial PLCs |
Applications
| Telecom Server Power Monitoring | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Real-time monitoring of 12V main, 5V logic, 3.3V I/O, 2.5V memory, 1.8V FPGA core, and –5.2V analog rails in 1U rack-mounted base station equipment. IC Role / Device Role / Timing Role: Six-rail supervisor with independent COMP outputs feeding FPGA status registers and RST driving CPU reset controller. Use Value: Enables simultaneous rail validation and selective subsystem shutdown without firmware intervention - critical for NEBS compliance. | Use Scenario: Monitoring battery (12V), ignition-switched 5V, CAN transceiver 3.3V, sensor 2.5V, MCU core 1.8V, and oxygen sensor –12V supplies in under-hood ECU. IC Role / Device Role / Timing Role: High-temp supervisor asserting RST during cold cranking (VCC ≥ 1V) and triggering COMP6 on overtemperature via thermistor on V6. Use Value: Guarantees safe MCU reset below 1V VCC and supports ISO 16750-2 pulse testing with ±1.5% threshold stability. |
| Industrial PLC Backplane | Network Switch ASIC Power Sequencing |
Use Scenario: Supervising redundant 24V, 12V, 5V, 3.3V, 1.8V, and 1.2V supplies across modular I/O backplane with hot-swap capability. IC Role / Device Role / Timing Role: Configured in ADJ/ADJ/ADJ/ADJ/ADJ/ADJ mode using external dividers; COMP outputs enable DC/DC converters in sequence. Use Value: Eliminates discrete sequencing ICs and reduces PCB area by 35% versus dual 3-rail solutions. | Use Scenario: Coordinating power-up of 12V PHY, 5V switch fabric, 3.3V management CPU, 1.8V SerDes, 1.2V core, and –3.3V analog in 10G Ethernet switch ASIC. IC Role / Device Role / Timing Role: Mode 13 configuration (5V/3.3V/1.8V/–ADJ/ADJ/ADJ) with COMP1–COMP5 enabling converters; RST released after final rail stabilizes. Use Value: Achieves <10ms total sequencing window with no external timing components - meets IEEE 802.3ap compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar six-rail monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6816ESE+ | Fixed 6-rail thresholds (no ADJ); 3.5μA IQ; only 4 comparator outputs; no watchdog | Limited to static 5V/3.3V/2.5V/1.8V systems; unsuitable for negative or custom thresholds | Choose for ultra-low-power legacy designs where adjustability and watchdog are unnecessary |
| TPS3808G33DBVR | Single 3.3V supervisor; no multirail support; 1.1μA IQ; fixed 200ms reset timeout | Requires five additional devices to match LTC2931HF#PBF's six-rail coverage and configurability | Choose only for single-rail cost-sensitive applications - not a functional substitute |
Compared with MAX6816ESE+ and TPS3808G33DBVR, the LTC2931HF#PBF uniquely integrates six independently configurable comparators, adjustable reset/watchdog timers, and –40°C to +125°C operation in one 20-pin TSSOP - reducing component count, board space, and qualification effort for complex multivoltage systems.
Availability
LTC2931HF#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, automotive ECU, and industrial PLC applications requiring stable component supply, extended temperature operation, and configurable multirail supervision.
Supply support for LTC2931HF#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC2931 product line was designed specifically for high-reliability multivoltage system supervision in telecom, industrial, and automotive applications - emphasizing precision threshold accuracy, wide temperature operation, and flexible configuration without firmware dependency.
FAQ
What is the operating temperature range of the LTC2931HF#PBF?
The LTC2931HF#PBF is rated for –40°C to +125°C operation, making it suitable for under-hood automotive, industrial control, and telecom base station applications where ambient temperatures exceed standard commercial or industrial grades. This rating is validated per the H-grade specification and confirmed in the Absolute Maximum Ratings table.
How does the LTC2931HF#PBF select its voltage monitoring configuration?
The LTC2931HF#PBF selects one of 16 voltage combinations using an external 1% resistive divider between VREF and GND, with the tap point connected to the VPG pin. The VPG voltage relative to VREF determines the mode - e.g., VPG/VREF = 0.406 selects 5V/3.3V/2.5V/1.8V thresholds. No programming interface or EEPROM is involved; configuration is purely analog and occurs at power-up.
Can the LTC2931HF#PBF monitor negative voltages?
Yes - the LTC2931HF#PBF supports negative voltage monitoring on V4 input in –ADJ mode, where the reference is grounded and VTRIP = –VREF × (R3/R4). VREF = 1.210V provides level-shifting, enabling accurate trip points such as –5.2V using recommended 1% resistor values from Table 3. V5 and V6 inputs remain positive-only adjustable.
What is the minimum VCC required for reliable RST output operation in the LTC2931HF#PBF?
The LTC2931HF#PBF guarantees correct RST logic state (active-low assertion) down to VCC = 1V, as specified in the Electrical Characteristics table under "Minimum Internal Operating Voltage." This ensures deterministic reset behavior during deep brownout conditions before other system logic fails - a key differentiator versus competitors requiring ≥2.5V VCC.
How are reset and watchdog timeout periods set on the LTC2931HF#PBF?
Reset timeout (tRST) is set by connecting a capacitor from CRT to GND: tRST = 2 ms/nF. Watchdog timeout (tWD) is set similarly on CWT: tWD = 20 ms/nF. Both use internal 2μA charging currents. Leaving CRT or CWT open yields ~25μs or ~200μs minimum delays respectively; grounding CWT disables the watchdog entirely.
LTC2931HF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Six Power Supply Monitor
- Voltage - Input:
- -
- Voltage - Supply:
- 1V ~ 7V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
LTC2931HF#PBF FAQ
1.How can I place an order for LTC2931HF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2931HF#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 LTC2931HF#PBF reliable?
The price and inventory of LTC2931HF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2931HF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2931HF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2931HF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2931HF#PBF?
LTC2931HF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2931HF#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 LTC2931HF#PBF?
For technical support, including LTC2931HF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2931HF#PBF requirements.
6.How does Aetrix verify that LTC2931HF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2931HF#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 LTC2931HF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2931HF#PBF?
All LTC2931HF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2931HF#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 LTC2931HF#PBF part is unused and in its original packaging.
Return procedure for LTC2931HF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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