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Analog Devices Inc. LTC2912CDDB-2#TRMPBF
- Part No.:
- LTC2912CDDB-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2912CDDB-2#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,009
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Product details
Overview
LTC2912CDDB-2#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 open-drain OV/UV outputs-designed for margining applications in desktop computers and network servers.
For engineers reviewing the LTC2912CDDB-2#TRMPBF datasheet, LTC2912CDDB-2#TRMPBF pinout, LTC2912CDDB-2#TRMPBF application, or LTC2912CDDB-2#TRMPBF equivalent, key selection criteria include its DIS pin–enabled output disable function, adjustable reset timeout via external capacitor, guaranteed operation down to VCC = 1V, and compatibility with 3.3V ±10% and 48V supply monitoring topologies.
Technical Context
The LTC2912CDDB-2#TRMPBF implements dual comparator-based UV/OV detection with internal 0.5V reference, glitch-immune input filtering, and independent programmable timeout periods for both OV and UV outputs. Its DIS pin (Pin 1) provides active-high disable control for both outputs except during VCC undervoltage lockout (UVLO).
It features an internal VCC shunt regulator (6.2V typical) enabling direct operation from higher supplies (e.g., 12V/24V/48V) when used with a series current-limiting resistor. The TMR pin supports timeout adjustment from ~6ms to >10s using a 1nF–10µF capacitor tied to GND-or bypasses timing when strapped to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.3V to 6V direct operation; up to 48V with external series resistor and shunt regulation at 6.2V |
| Threshold Accuracy | ±1.5% over full temperature range (0°C to 70°C), critical for precise 3.3V ±10% or 48V power-good monitoring |
| Quiescent Current | 29µA typical - enables micropower system-level supervision without impacting standby budget |
| UV/OV Timeout Period | Adjustable from 6ms to 12.5ms per nF on TMR pin; disableable via DIS pin for margining test modes |
| Output Type | Open-drain OV and UV outputs with weak internal pull-up to VCC and strong pull-down (≤0.1V @ 2.5mA) |
| VCC UVLO Threshold | 2.0V typical with 25mV hysteresis - ensures reliable reset assertion during brownout conditions |
| Operating Temperature | 0°C to 70°C (C-grade), validated for commercial computing and server board environments |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN (DDB) with exposed thermal pad (Pin 9, GND). RoHS-compliant, lead-free finish (#TRMPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DIS | Output Disable Input | Active-high control: disables OV/UV outputs (except during VCC UVLO); internal 2µA pull-down allows floating use |
| 2 - UV | Undervoltage Logic Output | Open-drain, asserts low on VH input < 0.5V; held low for programmed timeout after fault clearance |
| 3 - OV | Overvoltage Logic Output | Open-drain, asserts low on VL input > 0.5V; held low for programmed timeout after fault clearance |
| 4 - GND | Ground Reference | Primary signal and power return; exposed pad (Pin 9) must be soldered to PCB ground plane for thermal performance |
| 5 - TMR | Reset Timeout Timer | Capacitor-connected node setting UV/OV pulse width (9ms/nF); strap to VCC to bypass timing |
| 6 - VL | Overvoltage Sense Input | Monitors low-side divider tap; triggers OV when > 0.5V; tie to GND if unused |
| 7 - VH | Undervoltage Sense Input | Monitors high-side divider tap; triggers UV when < 0.5V; tie to VCC if unused |
| 8 - VCC | Supply Input / Shunt Regulator | Accepts 2.3–6V directly; regulates >6V supplies via internal 6.2V shunt; bypass with ≥0.1µF capacitor |
Key Features
| Feature | Design Value |
|---|---|
| DIS pin–enabled margining support | Allows controlled deactivation of OV/UV outputs during production testing or voltage margining without hardware change |
| Glitch-immune comparator inputs | Integrated low-pass filtering rejects sub-500µs transients, eliminating false resets without adding hysteresis error |
| VCC shunt regulation | Enables direct connection to 12V/24V/48V rails using only one external dropping resistor - no LDO required |
| Guaranteed operation at VCC = 1V | Ensures valid UV assertion and OV blocking even during deep brownout, supporting robust power sequencing |
| Adjustable timeout with disable | TMR capacitor sets delay (6–12.5ms/nF); DIS pin overrides timing to force immediate output release |
Applications
| Desktop Power Sequencing | Network Server PSU Monitoring |
|---|---|
Use Scenario: Supervising 3.3V ±10% core rail during cold boot and thermal throttling cycles. IC Role / Device Role / Timing Role: Single UV/OV monitor generating synchronized reset pulses with 200ms timeout (via 22nF TMR cap) and DIS-controlled margining. Use Value: Eliminates need for discrete RC timers and dual comparators; ±1.5% threshold accuracy ensures compliance with Intel VRD specs. |
Use Scenario: Validating 48V intermediate bus integrity before enabling downstream DC/DC converters. IC Role / Device Role / Timing Role: High-voltage supervisor using VCC shunt regulation and 3-resistor divider (RA=357k, RB=80.6k, RC=37.4M) for <±10% power-good assertion. Use Value: Enables direct 48V monitoring without level-shifting circuitry; 29µA ICC minimizes standby loss in always-on management controllers. |
| Dual-Rail Margining Test | Industrial Embedded Controller Reset |
Use Scenario: Performing factory voltage margining on 3.3V and 2.5V I/O rails using shared DIS control. IC Role / Device Role / Timing Role: Two LTC2912CDDB-2#TRMPBF units sharing a common DIS signal to simultaneously disable OV/UV during test mode. Use Value: Replaces manual jumpering or firmware-controlled GPIO resets; eliminates risk of spurious resets during voltage sweep. |
Use Scenario: Providing fail-safe reset to ARM Cortex-M7 microcontroller during 12V battery brownout in transportation systems. IC Role / Device Role / Timing Role: UV monitor asserting reset when VH input falls below 0.5V (corresponding to 10.8V system input), with timeout disabled via DIS during emergency shutdown. Use Value: Guarantees reset assertion down to VCC = 1V - critical for deterministic MCU state capture during rapid battery collapse. |
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 | Same functionality and pinout; rated for –40°C to 85°C industrial temperature range | Required for extended-temperature deployments (e.g., outdoor telecom, automotive under-hood) | Select when ambient operating temperature exceeds 70°C; otherwise LTC2912CDDB-2#TRMPBF suffices for commercial environments |
| LTC2912HDDB-2#TRMPBF | Same functionality and pinout; rated for –40°C to 125°C high-reliability operation | Used in aerospace, industrial motor drives, and high-power computing where junction temperatures exceed 85°C | Choose only if thermal analysis confirms TJ > 85°C; adds cost and qualification overhead not needed for standard server/desktop use |
Compared with LTC2912IDDB-2#TRMPBF and LTC2912HDDB-2#TRMPBF, the LTC2912CDDB-2#TRMPBF offers identical electrical performance and pin compatibility at lower cost and qualification burden - making it optimal for commercial-grade computing and networking equipment where 0°C to 70°C ambient operation is sufficient.
Availability
LTC2912CDDB-2#TRMPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and industrial embedded controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC2912CDDB-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets.
The LTC2912 family delivers micropower, high-accuracy voltage supervision for space-constrained computing and server platforms - emphasizing glitch immunity, wide-supply operation, and margining flexibility without sacrificing threshold precision.
FAQ
What is the primary function of the DIS pin on the LTC2912CDDB-2#TRMPBF?
The DIS (Disable) pin on the LTC2912CDDB-2#TRMPBF is an active-high input that disables both OV and UV outputs during normal operation - holding them weakly pulled high - except during VCC undervoltage lockout (UVLO), when UV asserts low regardless of DIS state. This enables precise voltage margining and functional test modes without modifying hardware or firmware. The pin includes a 2µA internal pull-down, allowing safe floating operation.
Can the LTC2912CDDB-2#TRMPBF monitor a 48V supply directly?
Yes, the LTC2912CDDB-2#TRMPBF can monitor a 48V supply directly using its internal VCC shunt regulator. A series current-limiting resistor must be placed between the 48V source and the VCC pin to limit input current to ≤10mA. With typical shunt voltage of 6.2V, a 3.8kΩ resistor yields ~10mA at 48V. The device then operates from its regulated 6.2V rail while sensing scaled-down VH/VL voltages via resistive dividers - no external LDO is required.
What is the minimum capacitor value required on the TMR pin of the LTC2912CDDB-2#TRMPBF?
The minimum capacitor value required on the TMR pin of the LTC2912CDDB-2#TRMPBF is 10pF. Values below this may cause unstable or shortened timeout periods due to insufficient charge storage. For example, a 1nF capacitor yields a nominal timeout of 8.5ms (per datasheet, 9ms/nF typical). The TMR pin may also be strapped directly to VCC to bypass the timeout function entirely - useful for applications requiring immediate output response after fault clearance.
How does the LTC2912CDDB-2#TRMPBF ensure reliable operation during power-up sequences?
The LTC2912CDDB-2#TRMPBF guarantees UV assertion and OV blocking as soon as VCC reaches 1V, providing early reset signaling before other system components power up. Once VCC exceeds 2.1V, the VH and VL inputs become active, and an internal timer starts. After the adjustable timeout period, UV releases - ensuring sufficient hold time for supply stabilization. This behavior is fully specified across the 0°C to 70°C range and requires no external components beyond the TMR capacitor and sense dividers.
Is the LTC2912CDDB-2#TRMPBF pin-compatible with other variants in the LTC2912 family?
Yes, the LTC2912CDDB-2#TRMPBF is pin-compatible with all DFN-packaged LTC2912-x variants (e.g., LTC2912CDDB-1#TRMPBF, LTC2912CDDB-3#TRMPBF) in the same temperature grade. Pin assignments for VCC, GND, VH, VL, TMR, UV, OV, and DIS are identical across -1, -2, and -3 versions. Functional differences (latch control, disable, polarity) reside in internal logic - not pin mapping - enabling drop-in replacement where feature alignment permits.
LTC2912CDDB-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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2912CDDB-2#TRMPBF FAQ
1.How can I place an order for LTC2912CDDB-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2912CDDB-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 LTC2912CDDB-2#TRMPBF reliable?
The price and inventory of LTC2912CDDB-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 LTC2912CDDB-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2912CDDB-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2912CDDB-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2912CDDB-2#TRMPBF?
LTC2912CDDB-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2912CDDB-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 LTC2912CDDB-2#TRMPBF?
For technical support, including LTC2912CDDB-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2912CDDB-2#TRMPBF requirements.
6.How does Aetrix verify that LTC2912CDDB-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2912CDDB-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 LTC2912CDDB-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2912CDDB-2#TRMPBF?
All LTC2912CDDB-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2912CDDB-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 LTC2912CDDB-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2912CDDB-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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