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Analog Devices Inc. LTC2912CDDB-2#TRPBF
- Part No.:
- LTC2912CDDB-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2912CDDB-2#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2912CDDB-2#TRPBF from Analog Devices is a single-channel UV/OV voltage monitor IC with independent undervoltage and overvoltage detection, ±1.5% threshold accuracy, 29µA quiescent current, and adjustable reset timeout via external capacitor. It operates from 2.3V to 6V supply or higher (e.g., 12V/24V/48V) using internal shunt regulation, and features open-drain OV/UV outputs for margining applications in server power supplies.
For engineers reviewing the LTC2912CDDB-2#TRPBF datasheet, LTC2912CDDB-2#TRPBF pinout, LTC2912CDDB-2#TRPBF application, or LTC2912CDDB-2#TRPBF equivalent, key selection criteria include its DIS pin–enabled output disable function, DFN-8 (3mm × 2mm) package, 0°C to 70°C temperature grade, and precise 500mV internal reference for resistor-divider–based trip point programming.
Technical Context
The LTC2912CDDB-2#TRPBF implements dual comparator-based monitoring with low-pass filtering on VH and VL inputs to reject transient glitches, ensuring robust reset assertion without false triggering. Its internal 6.2V shunt regulator enables direct operation from 12V/24V/48V rails when paired with an external current-limiting resistor.
It integrates an adjustable timer (TMR pin) that sets UV/OV output pulse width (6–14ms typical for 1nF), and includes a dedicated DIS input (Pin 1) that disables both OV and UV outputs except during VCC undervoltage lockout (UVLO). The device guarantees valid outputs down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.3V to 6V direct; up to 48V with series resistor and internal 6.2V shunt regulator |
| Threshold Accuracy | ±1.5% over full temperature range - ensures tight trip point control for 3.3V ±10% or 5V ±10% supply monitoring |
| Quiescent Current | 29µA typical - enables always-on monitoring in battery-backed or low-power systems |
| UV/OV Timeout Range | 6ms to >10s via 10pF–100nF TMR capacitor - supports flexible reset pulse width tuning |
| Output Type | Open-drain OV and UV - allows wired-OR configuration and compatibility with 1.8V–5V logic levels |
| VCC UVLO Threshold | 1.9V to 2.1V with 5–50mV hysteresis - provides clean power-up/power-down sequencing |
| Input Voltage Range (VH/VL) | –0.3V to 7.5V - supports direct connection to high-side resistive dividers without level shifting |
Pinout & Package
Package: 8-Lead (3mm × 2mm) Plastic DFN (DDB), exposed pad (Pin 9) connected to GND. Thermal resistance θJA = 55°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIS) | Output Disable Input | Pulling high disables OV and UV outputs (except during VCC UVLO); internal 2µA pull-down enables default active operation when left open |
| 2 (UV) | Undervoltage Logic Output | Open-drain, asserts low when VH falls below threshold; held low for programmed timeout after recovery |
| 3 (OV) | Overvoltage Logic Output | Open-drain, asserts low when VL rises above threshold; disabled when DIS = high |
| 4 (GND) | Device Ground | Reference node for all analog and digital circuitry; must be connected to system ground plane |
| 5 (TMR) | Reset Timeout Timer | Capacitor-to-GND sets UV/OV pulse width (9ms/nF); tie to VCC to bypass timeout |
| 6 (VL) | Overvoltage Sense Input | Monitors low-side of resistor divider; triggers OV when voltage exceeds 500mV |
| 7 (VH) | Undervoltage Sense Input | Monitors high-side of resistor divider; triggers UV when voltage drops below 500mV |
| 8 (VCC) | Supply Input / Shunt Regulator | Accepts 2.3–6V directly; regulates higher voltages (e.g., 48V) via internal 6.2V shunt and external series resistor |
Key Features
| Feature | Design Value |
|---|---|
| Independent UV and OV detection | Enables simultaneous monitoring of same rail for both under- and overvoltage faults without shared timing constraints |
| Glitch-immune comparator inputs | Integrated low-pass filtering rejects <500µs transients, eliminating need for external RC filters or hysteresis-induced trip error |
| Adjustable timeout with disable | DIS pin allows dynamic deactivation of monitoring outputs during system calibration or margin testing |
| Micropower operation | 29µA ICC enables integration into always-on supervisory paths without impacting system standby budget |
| Wide VCC operating range | Internal shunt regulator supports direct use with 12V, 24V, and 48V industrial/server rails using simple resistor dropper |
Applications
| Server 48V Intermediate Bus Monitoring | Desktop CPU Core Voltage Margining |
|---|---|
|
Use Scenario: Monitoring 48V intermediate bus in telecom/datacom PSUs for ±10% fault detection before downstream DC-DC conversion. IC Role / Device Role / Timing Role: LTC2912CDDB-2#TRPBF acts as primary power-good supervisor, asserting UV/OV only after sustained deviation beyond 43.2V/52.8V thresholds with 85ms timeout. Use Value: DIS pin allows temporary suppression of fault signals during hot-swap insertion or load-step validation without hardware modification. |
Use Scenario: Verifying CPU core voltage (e.g., 1.2V ±5%) meets spec during production test by sweeping supply while observing UV/OV assertion. IC Role / Device Role / Timing Role: LTC2912CDDB-2#TRPBF serves as margining enabler-DIS pin disables outputs until test begins, then releases for real-time pass/fail indication. Use Value: Eliminates need for external logic or microcontroller polling; provides deterministic, hardware-based go/no-go feedback in <100µs. |
| Industrial PLC I/O Power Rail Supervision | Network Switch ASIC Core Supply Monitoring |
|
Use Scenario: Ensuring 3.3V and 5V I/O rails in programmable logic controllers remain within tolerance during EMI-heavy factory environments. IC Role / Device Role / Timing Role: LTC2912CDDB-2#TRPBF monitors each rail independently using resistor dividers; glitch filtering prevents spurious resets from motor noise. Use Value: ±1.5% threshold accuracy and 29µA supply current enable reliable long-term supervision without recalibration or battery drain. |
Use Scenario: Detecting brown-out or overvoltage events on 0.85V ASIC core supply in 10G Ethernet switches where timing margins are sub-microsecond. IC Role / Device Role / Timing Role: LTC2912CDDB-2#TRPBF interfaces via precision resistor network to scale 0.85V rail to 500mV internal reference; UVLO ensures reset at VCC = 1.9V. Use Value: Guarantees functional reset assertion even during partial power loss, preventing ASIC latch-up or data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2912IDDB-2#TRPBF | Same functionality and pinout; rated for –40°C to 85°C industrial temperature range | Suitable for extended-temperature deployments (e.g., outdoor base stations, automotive ECUs) | Select when ambient operating temperature exceeds 70°C; otherwise LTC2912CDDB-2#TRPBF is cost-optimized for commercial use. |
| LTC2912HDDB-2#TRPBF | Same functionality and pinout; rated for –40°C to 125°C high-reliability operation | Required for under-hood automotive or high-temperature industrial control cabinets | Choose only if junction temperature exceeds 85°C; thermal derating and qualification testing apply. |
Compared with LTC2912CDDB-2#TRPBF, the IDDB-2 and HDDB-2 variants retain identical electrical behavior and DFN-8 packaging but extend temperature capability-making them drop-in alternatives only when environmental stress demands broader operating range, not improved performance.
Availability
LTC2912CDDB-2#TRPBF is available at Aetrix Electronics and suitable for server power supplies, desktop motherboard voltage margining, industrial PLC I/O supervision, and network switch ASIC core monitoring requiring stable component supply across multi-year production cycles.
Supply support for LTC2912CDDB-2#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 family delivers precision, low-power voltage supervision for mission-critical power rails-designed specifically for server, networking, and industrial equipment where reliability, accuracy, and small footprint are essential.
FAQ
What is the function of the DIS pin on the LTC2912CDDB-2#TRPBF?
The DIS (Disable) pin on the LTC2912CDDB-2#TRPBF is a dedicated input that, when pulled high, disables both OV and UV output assertions-except during VCC undervoltage lockout (UVLO). This enables dynamic margining or test-mode operation without removing the IC from the circuit. An internal 2µA pull-down ensures normal monitoring when the pin is left unconnected.
Can the LTC2912CDDB-2#TRPBF monitor a 48V supply directly?
Yes-the LTC2912CDDB-2#TRPBF can monitor a 48V supply directly using its internal 6.2V shunt regulator on the VCC pin. A series current-limiting resistor must be added between the 48V source and VCC to restrict input current to ≤10mA. The datasheet provides design equations and example circuits (e.g., Figure 2912 TA03) for this configuration.
What is the minimum capacitor value required on the TMR pin of the LTC2912CDDB-2#TRPBF?
The TMR pin of the LTC2912CDDB-2#TRPBF requires a minimum 10pF capacitor to ground to ensure stable timeout operation. Values below 10pF may cause erratic or shortened reset pulses. For standard 8.5ms timeout, a 1nF capacitor is recommended; larger values scale linearly (e.g., 10nF yields ~85ms).
How does the LTC2912CDDB-2#TRPBF achieve ±1.5% threshold accuracy over temperature?
The LTC2912CDDB-2#TRPBF achieves ±1.5% threshold accuracy across 0°C to 70°C by trimming its internal 500mV reference during production and using matched comparator architectures with low-drift biasing. This specification applies to both VH and VL inputs and is guaranteed-not typical-ensuring consistent trip points in production systems without calibration.
Is the LTC2912CDDB-2#TRPBF pin-compatible with other variants in the LTC2912 family?
Yes-the LTC2912CDDB-2#TRPBF shares identical pinout and footprint with all DFN-packaged LTC2912-x variants (e.g., LTC2912IDDB-2#TRPBF, LTC2912HDDB-2#TRPBF, LTC2912CDDB-1#TRPBF). However, functional differences exist: only -2 versions include the DIS pin; -1/-3 versions feature LATCH instead. Swapping requires verifying functional compatibility, not just physical fit.
LTC2912CDDB-2#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/Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2912CDDB-2#TRPBF FAQ
1.How can I place an order for LTC2912CDDB-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2912CDDB-2#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 LTC2912CDDB-2#TRPBF reliable?
The price and inventory of LTC2912CDDB-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2912CDDB-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2912CDDB-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2912CDDB-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2912CDDB-2#TRPBF?
LTC2912CDDB-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2912CDDB-2#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 LTC2912CDDB-2#TRPBF?
For technical support, including LTC2912CDDB-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2912CDDB-2#TRPBF requirements.
6.How does Aetrix verify that LTC2912CDDB-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2912CDDB-2#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 LTC2912CDDB-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2912CDDB-2#TRPBF?
All LTC2912CDDB-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2912CDDB-2#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 LTC2912CDDB-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC2912CDDB-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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