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Analog Devices Inc. LTC2912HDDB-2#TRMPBF
- Part No.:
- LTC2912HDDB-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2912HDDB-2#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,865
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Product details
Overview
LTC2912HDDB-2#TRMPBF from Analog Devices is a precision single-channel UV/OV voltage monitor IC with independent open-drain OV and UV outputs, ±1.5% threshold accuracy over –40°C to 125°C, adjustable reset timeout via external capacitor (8.5 ms typical with 1 nF), and operation from 2.3V to 6V supply or up to 48V via internal shunt regulator - used in high-reliability power-good monitoring for industrial PLCs and telecom power modules.
For engineers reviewing the LTC2912HDDB-2#TRMPBF datasheet, LTC2912HDDB-2#TRMPBF pinout, LTC2912HDDB-2#TRMPBF application, or LTC2912HDDB-2#TRMPBF equivalent, key selection criteria include its H-grade temperature range (–40°C to 125°C), DIS pin-enabled margining support, glitch-immune VH/VL inputs, and DFN-8 (3mm × 2mm) package with exposed thermal pad.
Technical Context
The LTC2912HDDB-2#TRMPBF implements dual comparator-based monitoring: VH input triggers undervoltage when below 0.5 V, VL input triggers overvoltage when above 0.5 V; both inputs feature integrated low-pass filtering to reject sub-50 µs glitches without hysteresis-induced trip error. Its internal 6.2 V shunt regulator enables direct connection to 12 V/24 V/48 V rails with series current-limiting resistor.
It features an active-low DIS pin (Pin 1 in DDB package) that disables both OV and UV outputs except during VCC undervoltage lockout (UVLO < 2.1 V); TMR pin (Pin 5) sets timeout period (6–14 ms for 1 nF, H-grade) or bypasses timing when tied to VCC. Output behavior is open-drain with weak internal pull-up to VCC and strong sink capability (VOL = 0.1 V at 2.5 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.3 V to 6 V direct; up to 48 V with external series resistor and internal 6.2 V shunt regulator |
| Threshold Accuracy | ±1.5% over full –40°C to 125°C operating range - ensures reliable trip points for 3.3 V ±10% or 5 V ±10% supplies |
| Quiescent Current | 29 µA typical - enables micropower operation in battery-backed or always-on systems |
| UV/OV Timeout (H-grade) | 6–14 ms with 1 nF TMR capacitor - programmable delay prevents false resets during transient recovery |
| Input Glitch Immunity | Rejects transients < 50 µs duration - eliminates need for external RC filtering on VH/VL inputs |
| VCC UVLO Threshold | 1.9–2.1 V with 5–50 mV hysteresis - guarantees clean power-on reset assertion down to 1 V VCC |
| Output Type | Open-drain OV and UV with weak VCC pull-up and 2.5 mA sink capability - supports wired-OR fault-bus architectures |
Pinout & Package
Package: 8-lead (3 mm × 2 mm) plastic DFN (DDB) with exposed thermal pad (Pin 9, GND). Thermal resistance θJA = 55°C/W; requires soldering of exposed pad for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIS) | Output Disable Control | Pulling high disables OV/UV outputs (except during VCC UVLO); internal 2 µA pull-down allows floating for default enable |
| 2 (UV) | Undervoltage Logic Output | Open-drain active-low output asserted when VH < 0.5 V; held low for programmed timeout after recovery |
| 3 (OV) | Overvoltage Logic Output | Open-drain active-low output asserted when VL > 0.5 V; held low for programmed timeout after recovery |
| 4 (GND) | Ground Reference | Primary signal and power ground; connects to exposed thermal pad (Pin 9) |
| 5 (TMR) | Timeout Timer Input | Capacitor-to-GND sets UV/OV pulse width (9 ms/nF); tie to VCC to bypass timing |
| 6 (VL) | Overvoltage Sense Input | Monitors low-side divider tap; >0.5 V triggers OV; tie to GND if unused |
| 7 (VH) | Undervoltage Sense Input | Monitors high-side divider tap; <0.5 V triggers UV; tie to VCC if unused |
| 8 (VCC) | Supply Input / Shunt Regulator | Accepts 2.3–6 V directly; regulates >6 V supplies via internal 6.2 V shunt (max 10 mA) |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable UV/OV timeout | Programmable 6–14 ms (H-grade) using 1–1000 nF capacitor on TMR pin - avoids fixed-timer inflexibility |
| Glitch-immune sensing | Integrated input filtering rejects <50 µs transients - eliminates external RC networks and associated tolerance drift |
| H-grade temperature range | –40°C to 125°C operation with guaranteed ±1.5% threshold accuracy - suitable for under-hood automotive or industrial enclosures |
| Margining support | DIS pin enables controlled disable of OV/UV during supply margin testing - critical for production burn-in and validation |
| High-voltage rail compatibility | Internal 6.2 V shunt regulator + external series resistor allows direct 48 V system integration - reduces BOM count vs discrete regulator solutions |
Applications
| Industrial PLC Power Monitoring | Telecom 48 V DC-DC Module Supervision |
|---|---|
|
Use Scenario: Continuous monitoring of 24 V and 48 V backplane supplies in programmable logic controllers with strict IEC 61000-4-4 immunity requirements. IC Role / Device Role / Timing Role: LTC2912HDDB-2#TRMPBF acts as primary UV/OV supervisor, asserting fault signals to FPGA-based control logic only after validated 8.5 ms timeout - preventing spurious trips from EFT bursts. Use Value: ±1.5% threshold accuracy and 50 µs glitch rejection ensure compliance with SIL-2 functional safety diagnostics without additional filtering components. |
Use Scenario: Real-time supervision of isolated 48 V → 12 V/5 V/3.3 V DC-DC converters in telecom line cards where brownout must trigger graceful shutdown before memory corruption. IC Role / Device Role / Timing Role: LTC2912HDDB-2#TRMPBF monitors secondary-side 3.3 V rail via resistive divider; DIS pin enables dynamic margining during factory test by disabling outputs while injecting ±5% supply variation. Use Value: H-grade temperature stability and 29 µA quiescent current allow placement near hot-running MOSFETs without thermal derating or self-heating errors. |
| Automotive Body Control Module (BCM) | Server PSU Power-Good Signaling |
|
Use Scenario: Monitoring 5 V microcontroller core supply in under-hood BCMs exposed to –40°C cold cranking and 125°C engine bay ambient. IC Role / Device Role / Timing Role: LTC2912HDDB-2#TRMPBF provides UV detection at 4.5 V (10% below nominal) and OV at 5.5 V, with timeout disabled during VCC UVLO to guarantee immediate reset assertion at startup. Use Value: Guaranteed operation down to VCC = 1 V and ±1.5% accuracy across full temperature range eliminate need for external calibration or lookup tables. |
Use Scenario: Generating synchronized power-good signals for multi-rail server PSUs where 3.3 V, 5 V, and 12 V rails must all stabilize within 100 ms before CPU release. IC Role / Device Role / Timing Role: LTC2912HDDB-2#TRMPBF supervises 3.3 V rail; its open-drain OV/UV outputs are wire-OR'd with other LTC2912 variants monitoring 5 V/12 V to drive single PG# net to motherboard. Use Value: Matched 8.5 ms timeout (H-grade) and identical VOL/VOL specs across variants ensure deterministic, race-free power-good assertion timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2912IDDB-2#TRMPBF | I-grade (–40°C to 85°C), same pinout and electrical specs except reduced temperature range and ±1.5% accuracy only to 85°C | Suitable for commercial indoor equipment; not qualified for extended-temperature industrial or automotive use | Select LTC2912HDDB-2#TRMPBF when operation beyond 85°C ambient or full-range accuracy certification is required |
| LTC2912HDDB-1#TRMPBF | H-grade with latch control on OV output (Pin 1 = LATCH, not DIS); no margining disable function | Used where persistent OV fault indication is needed until manual clear, rather than temporary disable during margin testing | Choose LTC2912HDDB-2#TRMPBF specifically for production test margining workflows requiring DIS-driven output blanking |
Compared with LTC2912IDDB-2#TRMPBF, the LTC2912HDDB-2#TRMPBF extends guaranteed accuracy to 125°C and supports harsher environments; compared with LTC2912HDDB-1#TRMPBF, it replaces latch functionality with DIS-controlled margining - making it the only variant enabling automated supply tolerance validation.
Availability
LTC2912HDDB-2#TRMPBF is available at Aetrix Electronics and suitable for industrial PLCs, telecom power modules, automotive body control units, and server PSUs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2912HDDB-2#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 product line delivers precision, low-power, single-supply UV/OV monitoring for mission-critical power integrity applications - designed specifically for systems demanding guaranteed accuracy, glitch immunity, and extended temperature reliability without external support components.
FAQ
What is the maximum input voltage the LTC2912HDDB-2#TRMPBF can monitor directly?
The LTC2912HDDB-2#TRMPBF does not directly monitor high voltages; it senses scaled-down versions via external resistor dividers on VH and VL pins. Its absolute maximum VH/VL input voltage is 7.5 V. For 48 V rail monitoring, a precision 10:1 divider (e.g., 45.3 kΩ/5.11 kΩ) scales 48 V to 4.75 V at VL, staying within safe input limits while preserving ±1.5% trip accuracy.
How does the DIS pin on the LTC2912HDDB-2#TRMPBF affect UVLO behavior?
During VCC undervoltage lockout (UVLO < 2.1 V), the LTC2912HDDB-2#TRMPBF asserts UV low regardless of DIS pin state - ensuring fail-safe reset even when DIS is pulled high. However, once VCC rises above UVLO threshold, DIS high forces both OV and UV outputs into high-impedance state (weakly pulled high), suppressing all fault signaling until DIS is returned low.
Can the LTC2912HDDB-2#TRMPBF operate from a 12 V supply without external components?
No - the LTC2912HDDB-2#TRMPBF requires an external current-limiting resistor between the 12 V source and VCC pin. With its internal 6.2 V shunt regulator, the resistor must limit current to ≤10 mA (R ≥ 580 Ω). A 620 Ω 1% resistor ensures safe operation while maintaining <100 mV regulation error across load variations.
What is the minimum TMR capacitor value supported by the LTC2912HDDB-2#TRMPBF?
The LTC2912HDDB-2#TRMPBF requires a minimum 10 pF capacitor on the TMR pin to ensure stable oscillator operation. Using less than 10 pF may cause erratic timeout behavior or failure to assert OV/UV. For 8.5 ms timeout (H-grade), a 1 nF ±10% X7R ceramic capacitor is recommended - placed within 2 mm of the TMR pin with short, low-inductance traces to GND.
Does the LTC2912HDDB-2#TRMPBF support negative voltage monitoring?
No - the LTC2912HDDB-2#TRMPBF is designed exclusively for positive-supply monitoring. VH and VL inputs are referenced to GND and cannot accept negative voltages (absolute minimum is –0.3 V per Absolute Maximum Ratings). For negative rail supervision, Analog Devices recommends the LTC2909, which includes dedicated negative-input comparators and separate VCC biasing.
LTC2912HDDB-2#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/Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2912HDDB-2#TRMPBF FAQ
1.How can I place an order for LTC2912HDDB-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2912HDDB-2#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 LTC2912HDDB-2#TRMPBF reliable?
The price and inventory of LTC2912HDDB-2#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2912HDDB-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2912HDDB-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2912HDDB-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2912HDDB-2#TRMPBF?
LTC2912HDDB-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2912HDDB-2#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 LTC2912HDDB-2#TRMPBF?
For technical support, including LTC2912HDDB-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2912HDDB-2#TRMPBF requirements.
6.How does Aetrix verify that LTC2912HDDB-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2912HDDB-2#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 LTC2912HDDB-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2912HDDB-2#TRMPBF?
All LTC2912HDDB-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2912HDDB-2#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 LTC2912HDDB-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2912HDDB-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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