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Analog Devices Inc. LTC2912CDDB-3#TRMPBF
- Part No.:
- LTC2912CDDB-3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2912CDDB-3#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2912CDDB-3#TRMPBF from Analog Devices is a single-channel UV/OV voltage monitor IC in an 8-lead (3mm × 2mm) DFN package, operating from 2.3V to 6V supply with ±1.5% threshold accuracy, 29µA quiescent current, and noninverting open-drain OV output - designed for reliable power-good supervision in 3.3V ±10% systems such as desktop motherboards and network server power rails.
For engineers reviewing the LTC2912CDDB-3#TRMPBF datasheet, LTC2912CDDB-3#TRMPBF pinout, LTC2912CDDB-3#TRMPBF application, or LTC2912CDDB-3#TRMPBF equivalent, key selection criteria include its latch-controlled noninverting OV output, adjustable timeout via external capacitor, guaranteed operation down to VCC = 1V, and compatibility with high-voltage supplies (e.g., 48V) using series current-limiting resistors.
Technical Context
The LTC2912CDDB-3#TRMPBF implements dual comparator-based monitoring: VH input triggers undervoltage when below 0.5V, VL input triggers overvoltage when above 0.5V. Both inputs feature internal low-pass filtering to reject sub-500µs glitches, ensuring noise-immune reset assertion without added hysteresis error.
Its TMR pin accepts an external capacitor (1nF typical) to set UV/OV timeout period (6–14ms range), while LATCH pin enables OV latching behavior - high disables latching (OV follows UV timing), low enables latching (OV remains asserted until cleared). The device includes an internal 6.2–7.3V shunt regulator on VCC, enabling direct connection to 12V/24V/48V supplies with appropriate series resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.3V to 6V direct; up to 48V with external series resistor due to internal 6.2–7.3V shunt regulator |
| UV/OV Threshold Accuracy | ±1.5% over full temperature range - ensures precise 3.3V ±10% trip points (e.g., 2.97V UV, 3.63V OV) |
| Quiescent Current | 29µA typical - enables micropower operation in always-on supervisory circuits |
| Output Type | Open-drain UV (active-low) and noninverting OV (active-high with weak pull-up to VCC) |
| Reset Timeout Control | Adjustable via external TMR capacitor (e.g., 1nF → 8.5ms); TMR tied to VCC bypasses timeout |
| Operating Temperature | 0°C to 70°C (C-grade) - validated for commercial computing and industrial control environments |
| VCC Undervoltage Lockout | Active below 1.9–2.1V - guarantees valid UV assertion and blocks OV during brownout |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9), RoHS-compliant, lead-free finish. Thermal resistance θJA = 55°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 8) | Power supply input | Accepts 2.3–6V directly; functions as shunt-regulated input for higher voltages (e.g., 48V) with series resistor limiting current to ≤10mA |
| VH (Pin 7) | Undervoltage sense input | Triggers UV when voltage falls below 0.5V; internally filtered to reject <500µs transients |
| VL (Pin 6) | Overvoltage sense input | Triggers OV when voltage rises above 0.5V; same glitch immunity as VH |
| TMR (Pin 5) | Timeout timer control | Connects to GND via capacitor (e.g., 1nF) to set UV/OV pulse width; tie to VCC to disable timeout |
| LATCH (Pin 1) | OV latch enable/clear | Pulled low to latch OV high on fault; pulled high to bypass latching and align OV timing with UV |
| UV (Pin 2) | Undervoltage logic output | Open-drain, active-low output; asserts low during VH < 0.5V and holds for programmed timeout |
| OV (Pin 3) | Overvoltage logic output | Noninverting, active-high open-drain output with weak internal pull-up to VCC; latches high when LATCH = low |
| GND (Pin 4) | Ground reference | Primary return path; exposed pad (Pin 9) is also GND and must be soldered |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-immune dual comparators | Internal RC filtering rejects transients <500µs - eliminates need for external hysteresis and avoids trip-point error |
| Noninverting OV output | Active-high behavior simplifies wired-OR reset bus integration and avoids level-shifting in 3.3V systems |
| Adjustable timeout with disable | Capacitor-programmable delay (6–14ms) + VCC-strapping option enables flexible reset pulse width tuning per system requirements |
| Low-voltage operation guarantee | Valid UV/OV assertion down to VCC = 1V - ensures robust power sequencing in multi-rail systems during startup/brownout |
| High-voltage supply compatibility | Integrated 6.2–7.3V shunt regulator allows direct connection to 12V/24V/48V rails using only one series resistor |
Applications
| Desktop Motherboard Power Monitoring | Network Server Core Rail Supervision |
|---|---|
|
Use Scenario: Monitoring 3.3V ±10% main I/O rail on ATX-compliant motherboard with 200ms reset timeout. IC Role / Device Role / Timing Role: LTC2912CDDB-3#TRMPBF acts as primary UV/OV supervisor, asserting UV low and OV high on out-of-tolerance events; TMR capacitor sets 200ms hold time for BIOS reset compliance. Use Value: Eliminates discrete resistor-divider + comparator solutions, reduces BOM count by 4 components, and guarantees ±1.5% trip accuracy across 0°C–70°C. |
Use Scenario: Supervising 12V auxiliary supply in 1U rack server where transient immunity prevents false reboots during hot-swap events. IC Role / Device Role / Timing Role: LTC2912CDDB-3#TRMPBF monitors scaled-down 12V rail (via resistor divider) with VH/VL inputs; internal glitch filter suppresses 100ns–400ns noise from switching regulators. Use Value: Prevents spurious resets during PCIe slot insertion; 29µA quiescent current minimizes standby power impact on 80 PLUS Titanium efficiency targets. |
| Industrial PLC Power-Good Signaling | Medical Imaging System 48V DC-DC Monitor |
|
Use Scenario: Generating "POWER_GOOD" signal for FPGA configuration in programmable logic controller with fail-safe shutdown on 5V rail collapse. IC Role / Device Role / Timing Role: LTC2912CDDB-3#TRMPBF provides independent UV and OV outputs - UV drives FPGA INIT_B, OV enables isolated gate driver for backup battery switchover. Use Value: Dual open-drain outputs allow separate control paths; latch mode (LATCH = low) holds OV high until manual clear, supporting deterministic fault recovery. |
Use Scenario: Monitoring 48V intermediate bus in portable MRI subsystem where overvoltage could damage sensitive analog front-end. IC Role / Device Role / Timing Role: LTC2912CDDB-3#TRMPBF operates from 48V via 200kΩ series resistor into VCC shunt regulator; VL input detects >52.8V (OV) using precision divider. Use Value: Enables single-chip 48V supervision without external LDO; ±1.5% threshold accuracy ensures compliance with IEC 60601-1 overvoltage limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2912CDDB-1#TRMPBF | Latching OV output is active-low (inverted) vs. LTC2912CDDB-3#TRMPBF's active-high noninverting OV | Requires inverted logic handling in reset state machines; unsuitable where active-high "POWER_GOOD" is mandated | Select LTC2912CDDB-1#TRMPBF only if system design expects low-active OV assertion and uses standard open-drain OR-ing |
| LTC2913IDDB#TRPBF | Dual independent UV/OV channels, 10-lead DFN, wider temp range (–40°C to 85°C), no LATCH pin | Supports monitoring of two rails (e.g., 3.3V + 1.8V) simultaneously; lacks latch control but adds margining flexibility | Choose LTC2912CDDB-3#TRMPBF for cost-sensitive single-rail designs requiring latch-enabled OV persistence; choose LTC2913IDDB#TRPBF for dual-rail or extended temperature needs |
Compared with LTC2912CDDB-1#TRMPBF, LTC2912CDDB-3#TRMPBF delivers native active-high OV signaling - reducing external logic and improving noise margin in 3.3V systems. Against LTC2913IDDB#TRPBF, it offers lower unit cost and smaller footprint for single-supply applications, trading dual-channel capability for simplicity and C-grade temperature compliance.
Availability
LTC2912CDDB-3#TRMPBF is available at Aetrix Electronics and suitable for desktop motherboard power sequencing, network server core rail supervision, and industrial PLC power-good signaling requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC2912CDDB-3#TRMPBF 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 family was engineered for space-constrained, low-power voltage supervision in computing and infrastructure equipment - delivering precision threshold accuracy, glitch immunity, and flexible output configurations in ultra-small DFN and TSOT packages.
FAQ
What is the function of the LATCH pin on the LTC2912CDDB-3#TRMPBF?
The LATCH pin on the LTC2912CDDB-3#TRMPBF controls the behavior of the OV output: when pulled low, OV latches high upon overvoltage detection and remains asserted until LATCH is raised high; when held high, OV behaves like UV with adjustable timeout and no latching. This enables flexible fault-hold strategies in safety-critical systems without external logic.
Can the LTC2912CDDB-3#TRMPBF monitor a 48V supply directly?
Yes - the LTC2912CDDB-3#TRMPBF can monitor a 48V supply by connecting it to the VCC pin through a series current-limiting resistor. Its internal 6.2–7.3V shunt regulator sinks excess current; for 48V operation, a ~200kΩ resistor limits VCC current to <10mA. The VH/VL inputs monitor scaled-down versions of the 48V rail via external resistor dividers.
What is the minimum capacitor value required on the TMR pin of the LTC2912CDDB-3#TRMPBF?
The minimum capacitor value required on the TMR pin of the LTC2912CDDB-3#TRMPBF is 10pF. Values below this may cause unstable or shortened timeout periods. A 1nF capacitor yields a typical timeout of 8.5ms; larger values scale linearly (e.g., 10nF → 85ms). Tying TMR directly to VCC disables the timeout function entirely.
How does the LTC2912CDDB-3#TRMPBF ensure reliable operation during power-up?
The LTC2912CDDB-3#TRMPBF guarantees UV assertion low and OV assertion high as soon as VCC reaches 1V, providing early power-good signaling before system clocks stabilize. Once VCC exceeds 2.1V, VH/VL inputs become active, and the internal timer starts - ensuring controlled release of reset after monitored voltage settles within tolerance.
What is the purpose of the exposed pad (Pin 9) on the LTC2912CDDB-3#TRMPBF DFN package?
The exposed pad (Pin 9) on the LTC2912CDDB-3#TRMPBF DFN package is electrically connected to GND and must be soldered to the PCB ground plane. It serves dual purposes: lowering thermal resistance (θJA = 55°C/W) for reliable operation at full load, and providing low-inductance grounding for noise-sensitive comparator inputs and output drivers.
LTC2912CDDB-3#TRMPBF 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2912CDDB-3#TRMPBF FAQ
1.How can I place an order for LTC2912CDDB-3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2912CDDB-3#TRMPBF 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 LTC2912CDDB-3#TRMPBF reliable?
The price and inventory of LTC2912CDDB-3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2912CDDB-3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2912CDDB-3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2912CDDB-3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2912CDDB-3#TRMPBF?
LTC2912CDDB-3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2912CDDB-3#TRMPBF 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 LTC2912CDDB-3#TRMPBF?
For technical support, including LTC2912CDDB-3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2912CDDB-3#TRMPBF requirements.
6.How does Aetrix verify that LTC2912CDDB-3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2912CDDB-3#TRMPBF 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 LTC2912CDDB-3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2912CDDB-3#TRMPBF?
All LTC2912CDDB-3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2912CDDB-3#TRMPBF, 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 LTC2912CDDB-3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2912CDDB-3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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