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Analog Devices Inc. LTC2912IDDB-3#TRPBF
- Part No.:
- LTC2912IDDB-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2912IDDB-3#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,763
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Product details
Overview
LTC2912IDDB-3#TRPBF from Analog Devices is a single-channel UV/OV voltage monitor IC in an 8-lead (3mm × 2mm) DFN package, designed for precise power supply supervision with ±1.5% threshold accuracy, 29µA quiescent current, and independent adjustable reset timeout for undervoltage and overvoltage events - deployed in server power rails and notebook core voltage monitoring.
For engineers reviewing the LTC2912IDDB-3#TRPBF datasheet, LTC2912IDDB-3#TRPBF pinout, LTC2912IDDB-3#TRPBF application, or LTC2912IDDB-3#TRPBF equivalent, this page delivers verified functional identity, confirmed DFN-8 pin mapping, temperature-rated (-40°C to +85°C) operation, noninverting OV output behavior, and real-world timing capacitor design guidance.
Technical Context
The LTC2912IDDB-3#TRPBF implements dual comparator-based monitoring with internal 0.5V reference, VH and VL inputs filtered to reject sub-50µs glitches, and independent UV/OV pulse generators driving open-drain outputs. Its TMR pin accepts external capacitance (1nF → 8.5ms timeout) and supports disable-by-tie-to-VCC mode.
As the -3 variant, it features a noninverting OV output (asserts high on overvoltage), latch-clear functionality via LATCH pin, guaranteed operation down to VCC = 1V, and internal VCC shunt regulation enabling direct connection to 12V/24V/48V supplies with series resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.3V to 6V direct; up to 48V with external series resistor via internal 6.2–7.3V shunt regulator |
| Threshold Accuracy | ±1.5% over full –40°C to +85°C range - ensures reliable trip points without recalibration across industrial environments |
| Quiescent Current | 29µA typical - enables always-on supervision in battery-backed or low-power embedded systems |
| UV/OV Timeout | Adjustable 6–14ms (H-grade) via TMR capacitor; bypassable by tying TMR to VCC - supports flexible reset pulse width tuning |
| Output Type | Open-drain UV and noninverting OV - allows wired-OR reset bus integration and compatibility with 1.8V–5V logic levels |
| Input Glitch Immunity | Rejects transients <50µs at VH/VL - eliminates false resets from switching noise or ESD-induced spikes |
| Operating Temp | –40°C to +85°C (I-grade) - qualified for industrial and telecom infrastructure applications |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9), RoHS-compliant, moisture sensitivity level 1. Thermal resistance θJA = 55°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 8) | Power supply input | Accepts 2.3–6V directly; regulates >6V via internal shunt; requires ≥0.1µF bypass capacitor |
| VH (Pin 7) | Undervoltage sense input | Triggers UV when voltage falls below 0.5V threshold; tied to high-side divider tap in 3-resistor config |
| VL (Pin 6) | Overvoltage sense input | Triggers OV when voltage rises above 0.5V threshold; tied to low-side divider tap |
| TMR (Pin 5) | Reset timeout timing control | Connects to GND via capacitor (e.g., 1nF → 8.5ms); tie to VCC to disable timeout |
| LATCH (Pin 1) | OV latch clear/bypass control | Pull high to clear latch or bypass timing; pull low to enable latched OV high assertion |
| UV (Pin 2) | Undervoltage logic output | Open-drain, asserts low on UV condition; weak internal pull-up to VCC |
| OV (Pin 3) | Overvoltage logic output | Noninverting, asserts high on OV condition; weak internal pull-up to VCC |
| GND (Pin 4) | Ground reference | Must connect exposed pad (Pin 9) to PCB ground plane for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Noninverting OV output | Eliminates need for external level-shifting when interfacing with microcontroller GPIOs expecting active-high reset signals |
| Guaranteed operation at VCC ≥ 1V | Ensures valid UV/OV assertion during brown-out conditions where supply dips below 2V but remains >1V |
| Adjustable timeout with disable option | Enables precise reset pulse width tuning (e.g., 200ms for FPGA configuration) or immediate response via TMR-to-VCC strap |
| Glitch-immune VH/VL inputs | Prevents spurious resets from transient coupling on power rails - no external RC filtering required |
| 3mm × 2mm DFN footprint | Reduces board area by >50% vs TSOT-23 while improving thermal performance (θJA = 55°C/W) |
Applications
| Server Power Sequencing | Notebook Core Voltage Monitoring |
|---|---|
|
Use Scenario: Supervising 12V intermediate bus and 3.3V auxiliary rail in rack-mounted network servers. IC Role / Device Role / Timing Role: LTC2912IDDB-3#TRPBF monitors each rail independently using resistor dividers; OV asserts high on overvoltage, UV asserts low on undervoltage. Use Value: Prevents damage from overvoltage transients and ensures clean power-up sequencing before CPU initialization. |
Use Scenario: Monitoring 1.8V DDR3 memory supply and 3.3V I/O rail in ultrabook platforms. IC Role / Device Role / Timing Role: LTC2912IDDB-3#TRPBF provides separate UV/OV detection per rail with 200ms timeout set via 22nF TMR capacitor. Use Value: Enables deterministic system reset without firmware intervention during voltage droop caused by sudden load changes. |
| Industrial PLC Power Good Signal | Telecom Line Card Supply Validation |
|
Use Scenario: Generating "Power Good" signal for 24V DC input in programmable logic controller backplane. IC Role / Device Role / Timing Role: LTC2912IDDB-3#TRPBF configured as single OV monitor (VH tied to GND, VL to 24V divider) with OV output pulled high via 10kΩ. Use Value: Delivers fail-safe indication of stable 24V supply before enabling downstream FPGAs and analog front-ends. |
Use Scenario: Validating ±48V phantom power and 3.3V digital supply in VoIP line cards. IC Role / Device Role / Timing Role: LTC2912IDDB-3#TRPBF used in dual configuration: one for +48V (via RZ shunt), another for 3.3V rail with LATCH pin controlled by FPGA. Use Value: Supports hot-swap compliance by asserting OV only after stable voltage is confirmed, avoiding false insertion detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2912IDDB-1#TRPBF | Latches OV low (not high); identical pinout, timing, and accuracy | Requires active-low reset input on host MCU; unsuitable where active-high assertion is mandatory | Select LTC2912IDDB-1#TRPBF only if system architecture demands inverted OV polarity and latch persistence |
| LTC2913IDDB#TRPBF | Dual independent UV/OV channels; 10-lead DFN; higher quiescent current (45µA) | Monitors two supplies simultaneously (e.g., 12V + 3.3V) without external logic; no LATCH pin | Choose LTC2913IDDB#TRPBF when space-constrained designs require dual-rail supervision with shared TMR control |
Compared with LTC2912IDDB-1#TRPBF, the LTC2912IDDB-3#TRPBF provides native active-high OV signaling - simplifying interface to modern SoCs with dedicated POR inputs - while LTC2913IDDB#TRPBF trades single-rail precision for dual-channel capability at higher current cost.
Availability
LTC2912IDDB-3#TRPBF is available at Aetrix Electronics and suitable for server power sequencing, notebook core voltage monitoring, industrial PLC power good signaling, and telecom line card supply validation requiring stable component supply across extended temperature ranges.
Supply support for LTC2912IDDB-3#TRPBF 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 since 1965.
The LTC2912 product line delivers micropower, precision voltage supervisors optimized for space-constrained, thermally demanding applications where glitch immunity and wide supply range are critical.
FAQ
What is the function of the LATCH pin on the LTC2912IDDB-3#TRPBF?
The LATCH pin on the LTC2912IDDB-3#TRPBF controls the behavior of the OV output: when pulled low, OV latches high upon overvoltage detection; when pulled high, OV behaves like UV with adjustable timeout and no latching. This enables flexible reset strategies - persistent fault indication or timed pulse generation - within the same LTC2912IDDB-3#TRPBF footprint.
Can the LTC2912IDDB-3#TRPBF monitor a 48V supply directly?
Yes - the LTC2912IDDB-3#TRPBF can monitor a 48V supply using its internal VCC shunt regulator. A series current-limiting resistor must be placed between the 48V source and the VCC pin to restrict current to ≤10mA. For example, a 3.8kΩ resistor limits current to ~10mA at 48V, ensuring safe operation while maintaining 29µA quiescent draw from the regulated internal rail.
How does the LTC2912IDDB-3#TRPBF achieve ±1.5% threshold accuracy over temperature?
The LTC2912IDDB-3#TRPBF achieves ±1.5% threshold accuracy over –40°C to +85°C through laser-trimmed internal resistors and a matched comparator architecture referenced to a stable 0.5V bandgap-derived threshold. This specification is guaranteed in production test across the full I-grade temperature range - not just at 25°C - ensuring consistent trip points in real-world thermal environments.
What is the minimum capacitor value required on the TMR pin of the LTC2912IDDB-3#TRPBF?
The minimum capacitor value required on the TMR pin of the LTC2912IDDB-3#TRPBF is 10pF. Values below this may cause unstable timeout behavior due to insufficient charge storage. A 1nF capacitor yields an 8.5ms timeout period, and larger values scale linearly (e.g., 10nF → 85ms). The TMR pin must never be left floating - tie to VCC to disable timeout if unused.
Does the LTC2912IDDB-3#TRPBF support wired-OR reset bus configurations?
Yes - both the UV and OV outputs of the LTC2912IDDB-3#TRPBF are open-drain, enabling direct wired-OR connection with other supervisors or reset sources. The weak internal pull-up (≈400kΩ) ensures compatibility with standard 3.3V or 5V logic buses, while the strong internal pull-down (≈50Ω) guarantees fast fall times (<20ns with 150pF load), making LTC2912IDDB-3#TRPBF suitable for multi-source reset arbitration.
LTC2912IDDB-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active High
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2912IDDB-3#TRPBF FAQ
1.How can I place an order for LTC2912IDDB-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2912IDDB-3#TRPBF 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 LTC2912IDDB-3#TRPBF reliable?
The price and inventory of LTC2912IDDB-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2912IDDB-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2912IDDB-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2912IDDB-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2912IDDB-3#TRPBF?
LTC2912IDDB-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2912IDDB-3#TRPBF 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 LTC2912IDDB-3#TRPBF?
For technical support, including LTC2912IDDB-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2912IDDB-3#TRPBF requirements.
6.How does Aetrix verify that LTC2912IDDB-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2912IDDB-3#TRPBF 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 LTC2912IDDB-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2912IDDB-3#TRPBF?
All LTC2912IDDB-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2912IDDB-3#TRPBF, 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 LTC2912IDDB-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC2912IDDB-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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