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Analog Devices Inc. LTC2914IGN-2#PBF
- Part No.:
- LTC2914IGN-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC2914IGN-2#PBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 16SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2914IGN-2#PBF from Analog Devices (formerly Linear Technology) is a quad-input, adjustable UV/OV supply monitor IC for simultaneous monitoring of four independent voltage rails - including up to two negative supplies - in power management systems. It features ±1.5% threshold accuracy over temperature, 62µA quiescent current, open-drain UV/OV outputs, and an adjustable reset timeout with disable capability. It is used in desktop/notebook computers and network servers for core/I/O rail supervision.
For engineers reviewing the LTC2914IGN-2#PBF datasheet, LTC2914IGN-2#PBF pinout, LTC2914IGN-2#PBF application, or LTC2914IGN-2#PBF equivalent, key selection criteria include guaranteed OV/UV assertion at VCC ≥ 1V, polarity-selectable inputs via three-state SEL pin, buffered 1V reference output, input glitch rejection, and compatibility with both SSOP and DFN packages across industrial temperature range (–40°C to +85°C).
Technical Context
The LTC2914IGN-2#PBF implements four independent comparator pairs (VHn/VLn), each configurable for positive or negative supply monitoring using a three-state SEL pin. Thresholds are referenced to a precision 0.5V internal comparator input, with trip points set externally via resistor dividers. All comparators share common open-drain UV and OV outputs.
Unlike the LTC2914-1 variant, the -2 version replaces the LATCH function with DIS (disable) logic: pulling DIS high forces both UV and OV outputs into high-impedance state, overriding all fault conditions except VCC UVLO. The TMR pin supports adjustable timeout delay (6–14 ms typical with 1 nF) or bypass when tied to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2.3V to 6V direct supply; shunt-regulated operation above 6V with external current-limiting resistor |
| Threshold Accuracy | ±1.5% over –40°C to +85°C - ensures reliable trip point stability without recalibration across thermal environments |
| Quiescent Current | 62 µA typical - enables low-power system supervision without impacting standby budget |
| Reference Output | 1.000 V ±15 mV (±1.5%) - buffered, ±1 mA capable, drives ≤1 nF load for negative-rail offset generation |
| Input Voltage Range | VHn/VLn: –0.3V to +7.5V - supports monitoring of negative supplies down to –5V (with 1V REF offset) |
| Reset Timeout Range | 6 ms to >10 s - programmable via CTMR capacitor (1 nF = ~8.5 ms); TMR pin can be strapped to VCC to disable timing |
| Output Type | Open-drain UV/OV with weak internal pull-up to VCC - enables wired-OR reset bus and flexible external pull-up selection |
Pinout & Package
Package: 16-Lead Plastic SSOP (GN), 0.150" wide, RoHS-compliant, rated for –40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VH1–VH4 (Pins 1,3,5,7) | High-side voltage input | Triggers UV if below 0.5V (positive rail) or OV if below 0.5V (negative rail, per SEL configuration) |
| VL1–VL4 (Pins 2,4,6,8) | Low-side voltage input | Triggers OV if above 0.5V (positive rail) or UV if above 0.5V (negative rail, per SEL configuration) |
| VCC (Pin 16) | Supply input / shunt regulator | Operates as direct supply ≤6V; functions as 6.6V shunt regulator above 6V with external series resistor |
| GND (Pin 9) | Device ground reference | Common return for all analog and digital circuitry; exposed pad optional in DFN, not present in SSOP |
| UV (Pin 12) | Undervoltage logic output | Open-drain, asserts low on any UV condition; held low for adjustable timeout after all inputs recover |
| OV (Pin 11) | Overvoltage logic output | Open-drain, asserts low on any OV condition; disabled when DIS = high (LTC2914-2 only) |
| REF (Pin 10) | Buffered 1V reference output | Sources/sinks ±1 mA; used as offset for negative-supply monitoring circuits; stable to 1 nF capacitive load |
| TMR (Pin 15) | Reset timeout timer control | Capacitor-connected to GND sets timeout period; tie to VCC to bypass timing entirely |
| SEL (Pin 14) | Three-state polarity select | Connect to VCC/GND/open to configure V3/V4 inputs for positive/negative/positive-negative mixed monitoring |
| DIS (Pin 13) | Output disable input | Active-high disable: pulls UV/OV high-impedance regardless of fault status (LTC2914-2 exclusive feature) |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent UV/OV monitoring | Simultaneously supervises four voltage rails with dedicated VHn/VLn pairs - eliminates need for multiple discrete supervisors |
| Configurable polarity per input pair | SEL pin selects positive-only, negative-only, or mixed polarity for V3/V4 inputs - enables single IC to monitor both +5V and –5V rails |
| Adjustable reset timeout with disable | CTMR capacitor sets precise pulse width; DIS pin provides hardware-level override for test mode or safe boot sequences |
| Guaranteed operation at low VCC | Asserts valid UV/OV states down to VCC = 1V - ensures supervision during brown-out and power-up sequencing |
| Glitch-immune comparator inputs | Integrated low-pass filtering rejects transients <500 µs duration - prevents false resets from switching noise or ESD |
Applications
| Desktop Power Sequencing | Notebook Battery Management |
|---|---|
Use Scenario: Coordinating startup of CPU core, memory, and I/O voltages in multi-rail ATX-style power supplies. IC Role / Device Role / Timing Role: LTC2914IGN-2#PBF monitors 5V, 3.3V, 2.5V, and 1.8V rails simultaneously; DIS pin disables reset during firmware-controlled soft-boot. Use Value: Eliminates discrete RC timers and reduces BOM count by consolidating four independent supervisors into one 16-pin SSOP device. | Use Scenario: Supervising battery pack voltage, system rail, DDR termination, and PCIe auxiliary supply in ultraportable platforms. IC Role / Device Role / Timing Role: LTC2914IGN-2#PBF uses SEL pin to configure V3/V4 for –3.3V battery sense and +1.05V DDR termination, with REF providing offset. Use Value: Enables accurate negative-voltage monitoring without external op-amps or level shifters - critical for Li-ion protection circuits. |
| Network Server PSU Monitoring | Industrial FPGA Power Integrity |
Use Scenario: Real-time validation of redundant 12V, 5V, 3.3V, and 1.2V outputs in hot-swap power modules. IC Role / Device Role / Timing Role: LTC2914IGN-2#PBF asserts UV/OV on any rail deviation; TMR capacitor sets 200ms timeout to allow transient recovery before system reset. Use Value: Prevents nuisance reboots from brief load transients while ensuring hard faults trigger immediate shutdown - improves MTBF. | Use Scenario: Ensuring clean power delivery to Xilinx Kintex or Intel Stratix FPGA banks with strict 3% tolerance requirements. IC Role / Device Role / Timing Role: LTC2914IGN-2#PBF monitors VCCINT (1.0V), VCCAUX (2.5V), VCCO (3.3V), and MGTAVCC (1.2V) with ±1.5% threshold accuracy. Use Value: Meets FPGA vendor spec for supply monitoring accuracy without calibration - avoids costly field failures due to undetected rail droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2914IDHC-2#PBF | Same functionality and specs, but in 5mm × 3mm DFN package instead of 16-lead SSOP | Better thermal performance (θJA = 43.5°C/W vs 110°C/W) and smaller footprint; requires re-layout | Select for space-constrained or thermally demanding PCBs where SSOP is impractical |
| TPS3307-33DGNR | Triple-channel supervisor (not quad); fixed 3.3V UV/OV thresholds; no negative rail support; no SEL or DIS pins | Limited to three rails; no programmability; unsuitable for mixed-polarity or custom-threshold designs | Choose only if application uses exactly three 3.3V rails and requires lowest cost, not flexibility |
Compared with LTC2914IGN-2#PBF, the DFN variant offers superior thermal dissipation and miniaturization at the cost of board redesign, while the TPS3307-33DGNR sacrifices channel count, adjustability, and negative monitoring capability for lower unit price and simpler integration in fixed-rail systems.
Availability
LTC2914IGN-2#PBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and industrial FPGA power integrity applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature operation.
Supply support for LTC2914IGN-2#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC2914 product line delivers highly integrated, micropower voltage supervisors optimized for multi-rail computing and communications infrastructure, emphasizing accuracy, configurability, and robustness across extended temperature ranges.
FAQ
What is the operating temperature range for the LTC2914IGN-2#PBF?
The LTC2914IGN-2#PBF is rated for –40°C to +85°C industrial temperature operation. This is confirmed by its "I" grade marking (IGN) and specified electrical characteristics over that full range, including ±1.5% threshold accuracy and 62 µA quiescent current. It is not rated for automotive (–40°C to +125°C) or military grades.
How does the DIS pin on the LTC2914IGN-2#PBF differ from the LATCH pin on the LTC2914-1 variants?
The DIS (Disable) pin on LTC2914IGN-2#PBF is an active-high input that forces both UV and OV outputs into high-impedance state, overriding all fault conditions except VCC UVLO. In contrast, the LATCH pin on LTC2914-1 variants controls OV output latching behavior and has no effect on UV. The DIS function is exclusive to -2 versions and replaces LATCH functionality entirely.
Can the LTC2914IGN-2#PBF monitor negative voltages, and how is it configured?
Yes, the LTC2914IGN-2#PBF can monitor up to two negative voltages using its VHn/VLn inputs and the buffered 1V REF output. Configuration requires connecting the negative rail through a resistor divider to VHn/VLn, with REF used as the offset reference. Polarity is selected via the three-state SEL pin - tying SEL to GND configures V3/V4 for negative monitoring, enabling OV/UV detection based on relative voltage thresholds.
What is the minimum VCC voltage required for the LTC2914IGN-2#PBF to assert valid UV/OV outputs?
The LTC2914IGN-2#PBF guarantees valid UV and OV output assertion at VCC ≥ 1V. Below this, behavior is undefined. At VCC = 1V, VOL is specified at ≤0.15V for UV under 100 µA sink, and the internal comparators remain functional. This enables reliable supervision during deep brown-out conditions and early power-up phases before regulators reach nominal output.
Does the LTC2914IGN-2#PBF require external components for basic operation, and what are they?
Yes, the LTC2914IGN-2#PBF requires external resistor dividers on each VHn/VLn pair to set UV/OV trip points, a 0.1 µF bypass capacitor on VCC, and optionally a timing capacitor (CTMR) on TMR for reset timeout. The REF pin may drive a small capacitor (<1 nF) for stability. No external pull-ups are mandatory due to internal weak pull-ups on UV/OV, though external resistors may be added for faster rise times or wired-OR bus configurations.
LTC2914IGN-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC2914IGN-2#PBF FAQ
1.How can I place an order for LTC2914IGN-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2914IGN-2#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 LTC2914IGN-2#PBF reliable?
The price and inventory of LTC2914IGN-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2914IGN-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC2914IGN-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2914IGN-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2914IGN-2#PBF?
LTC2914IGN-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2914IGN-2#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 LTC2914IGN-2#PBF?
For technical support, including LTC2914IGN-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2914IGN-2#PBF requirements.
6.How does Aetrix verify that LTC2914IGN-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2914IGN-2#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 LTC2914IGN-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC2914IGN-2#PBF?
All LTC2914IGN-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2914IGN-2#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 LTC2914IGN-2#PBF part is unused and in its original packaging.
Return procedure for LTC2914IGN-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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