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Analog Devices Inc. LTC2912HDDB-3#TRPBF
- Part No.:
- LTC2912HDDB-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2912HDDB-3#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,193
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Product details
Overview
LTC2912HDDB-3#TRPBF from Analog Devices is a single-channel UV/OV voltage monitor IC in an 8-lead (3mm × 2mm) DFN package, rated for –40°C to +125°C operation. It features ±1.5% threshold accuracy, 29µA quiescent current, open-drain OV and UV outputs, and adjustable reset timeout via external capacitor on the TMR pin. It monitors a single supply (e.g., 3.3V ±10%) in high-reliability industrial power systems.
For engineers reviewing the LTC2912HDDB-3#TRPBF datasheet, LTC2912HDDB-3#TRPBF pinout, LTC2912HDDB-3#TRPBF application, or LTC2912HDDB-3#TRPBF equivalent, key selection criteria include guaranteed OV/UV assertion down to VCC = 1V, noninverting OV output behavior (LTC2912-3 variant), glitch-immune VH/VL inputs, and compatibility with 12V/24V/48V supplies via internal shunt regulator.
Technical Context
The LTC2912HDDB-3#TRPBF implements dual comparator-based monitoring: VH input triggers undervoltage when below 0.5V, VL input triggers overvoltage when above 0.5V. Both inputs include low-pass filtering to reject sub-500µs glitches, ensuring noise immunity without added hysteresis error.
Its TMR pin controls a programmable timeout period (6–14ms typical with 1nF) that holds OV/UV asserted after fault clearance. The LATCH pin enables OV latching (high-active clear); in LTC2912-3, OV asserts high with weak internal pull-up to VCC and latches high upon overvoltage detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 6V direct supply; supports ≥12V via external series resistor and internal 6.2–7.3V shunt regulator. |
| Threshold Accuracy | ±1.5% over full temperature range (–40°C to +125°C), enabling precise 3.3V ±10% monitoring with <±15mV error margin. |
| Quiescent Current | 29µA typical at 25°C, enabling micropower operation in battery-backed or energy-constrained systems. |
| UV/OV Timeout | Adjustable 6–14ms (H-grade) using CTMR; bypassed when TMR tied to VCC - critical for deterministic reset pulse width control. |
| Output Type | Open-drain UV (active-low) and noninverting OV (active-high with weak VCC pull-up), supporting wired-OR and level-shifting interfaces. |
| Glitch Immunity | Input filtering rejects transients <500µs duration, eliminating false resets from switching noise or ESD coupling on monitored rails. |
| Min Valid VCC | Guaranteed UV/ OV assertion down to VCC = 1V, ensuring reliable power-on reset even during brownout conditions. |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9), rated for –40°C to +125°C operation. Exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 8) | Supply input / shunt regulator input | Accepts 2.3–6V directly; regulates higher voltages (e.g., 12V/24V/48V) via internal 6.2–7.3V shunt; requires ≥0.1µF bypass capacitor. |
| VH (Pin 7) | Undervoltage sense input | Triggers UV when voltage falls below 0.5V; internally filtered; tie to VCC if unused. |
| VL (Pin 6) | Overvoltage sense input | Triggers OV when voltage rises above 0.5V; internally filtered; tie to GND if unused. |
| TMR (Pin 5) | Reset timeout timing control | Connects to external capacitor (≥10pF) to set UV/OV assertion hold time; tie to VCC to disable timeout. |
| LATCH (Pin 1) | OV latch clear/bypass control | Pull high to clear OV latch or bypass latching; OV behaves like UV (timed assert) when LATCH = high. |
| UV (Pin 2) | Undervoltage logic output | Active-low open-drain output; asserts low during VH undervoltage; weak internal pull-up to VCC. |
| OV (Pin 3) | Overvoltage logic output | Active-high noninverting output (LTC2912-3); latches high on VL overvoltage; weak internal pull-up to VCC. |
| GND (Pin 4) | Ground reference | Primary signal and power return; connects to exposed pad (Pin 9) for optimal thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Noninverting OV Output | LTC2912-3 variant provides active-high OV signal with internal VCC pull-up, simplifying interface to microcontroller GPIOs expecting high-valid reset signals. |
| Guaranteed Operation at 1V VCC | Ensures robust power-on reset sequencing in systems where main supply ramps slowly or experiences deep brownouts before stabilization. |
| Adjustable Timeout with Disable | TMR pin allows precise reset pulse width tuning (e.g., 200ms with 22nF) or complete bypass - essential for meeting SoC or FPGA reset timing requirements. |
| Glitch-Filtered Inputs | VH and VL inputs integrate comparator outputs to reject <500µs noise spikes, eliminating need for external RC filters and saving board space. |
| H-Temperature Grade | Specified for –40°C to +125°C ambient, qualifying LTC2912HDDB-3#TRPBF for under-hood automotive, industrial motor drives, and telecom power modules. |
Applications
| Industrial PLC Power Monitoring | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Continuous monitoring of 12V battery-derived 5V/3.3V DC-DC outputs in programmable logic controllers operating in factory environments with wide temperature swings and EMI. IC Role / Device Role / Timing Role: Single-supply UV/OV supervisor asserting reset to CPU and I/O peripherals during rail collapse or surge events; timeout ensures minimum 200ms reset hold. Use Value: Prevents firmware corruption during unstable power-up/down by guaranteeing clean reset assertion even at VCC = 1V and rejecting switch-mode noise via built-in input filtering. | Use Scenario: Supervising 5V and 3.3V rails powering microcontrollers and CAN transceivers in body control units exposed to under-hood temperatures up to 125°C. IC Role / Device Role / Timing Role: Voltage monitor with H-grade qualification detecting undervoltage (e.g., battery sag below 11V) and overvoltage (e.g., alternator spike >16V) on critical MCU supply. Use Value: Enables fail-safe shutdown and recovery via noninverting OV output compatible with BCM's high-active reset logic, while ±1.5% accuracy ensures compliance with ISO 16750-2 transient immunity thresholds. |
| Telecom 48V Intermediate Bus Monitor | Server Core Voltage Sequencing |
Use Scenario: Monitoring 48V intermediate bus feeding point-of-load regulators in 5G base station power supplies, where reliability under thermal stress is critical. IC Role / Device Role / Timing Role: High-voltage supervisor using internal shunt regulator (6.2–7.3V) and external dropping resistor to derive VCC; detects UV/OV faults on 48V rail with 22nF TMR for 200ms reset hold. Use Value: Eliminates need for external LDO or charge pump, reducing BOM count and enabling direct 48V supervision with <29µA quiescent current - critical for always-on management functions. | Use Scenario: Ensuring proper power-up sequence and validity of 1.8V/1.2V core voltages in x86 server motherboards before releasing processor reset. IC Role / Device Role / Timing Role: Precision UV/OV detector with ±1.5% threshold accuracy monitoring scaled-down core rail via resistive divider; LATCH pin used to hold OV until firmware confirms stable operation. Use Value: Prevents premature CPU execution by guaranteeing reset remains asserted until core voltage settles within tolerance, leveraging adjustable timeout and latch functionality. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2912HDDB-1#TRPBF | LTC2912-1 variant: OV output is active-low and latched; no noninverting behavior. | Requires inverted logic interface; unsuitable where system expects high-valid OV reset signal. | Select only if legacy design uses active-low OV and latch-clear functionality is required. |
| LTC2913IDDB#TRPBF | Dual independent UV/OV monitor (two channels); 10-lead DFN; higher pin count and cost. | Supports simultaneous monitoring of two rails (e.g., 3.3V and 1.8V); not drop-in compatible. | Choose when dual-rail supervision is needed and board layout allows 10-pin footprint and additional routing. |
Compared with LTC2912HDDB-1#TRPBF, the LTC2912HDDB-3#TRPBF provides native high-valid OV signaling without level translation, simplifying interface to modern MCUs. Compared with LTC2913IDDB#TRPBF, it offers lower cost and smaller footprint for single-rail applications but lacks dual-channel capability.
Availability
LTC2912HDDB-3#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, telecom 48V power systems, and server core voltage supervision requiring stable component supply across extended temperature ranges.
Supply support for LTC2912HDDB-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.
The LTC2912 product line delivers precision, low-power voltage supervision for mission-critical power integrity in harsh environments - designed specifically for applications demanding guaranteed operation from 1V VCC and ±1.5% threshold accuracy over –40°C to +125°C.
FAQ
What is the function of the LATCH pin on the LTC2912HDDB-3#TRPBF?
The LATCH pin on the LTC2912HDDB-3#TRPBF controls the OV output behavior: when pulled low, OV latches high upon overvoltage detection; when pulled high, OV operates in timed mode (like UV) with adjustable timeout. This enables flexible reset strategies - latched for persistent fault indication or timed for automatic recovery after fault clearance. The LTC2912HDDB-3#TRPBF uses this to deliver noninverting, latch-capable OV signaling.
Can the LTC2912HDDB-3#TRPBF monitor a 48V supply directly?
Yes - the LTC2912HDDB-3#TRPBF supports 48V monitoring via its internal VCC shunt regulator (6.2–7.3V). A series current-limiting resistor must be placed between the 48V source and the VCC pin to restrict input current to ≤10mA. For example, a 3.8kΩ resistor limits current to ~10mA at 48V, allowing safe operation without external regulators. The LTC2912HDDB-3#TRPBF maintains full specification compliance including 29µA quiescent current and ±1.5% accuracy under this configuration.
How does the LTC2912HDDB-3#TRPBF achieve glitch immunity without hysteresis?
The LTC2912HDDB-3#TRPBF achieves glitch immunity by integrating low-pass filtering directly into the VH and VL comparator outputs - not by adding input hysteresis. This filtering rejects transients shorter than ~500µs while preserving exact 0.5V threshold accuracy. Unlike hysteresis-based solutions that introduce trip-point uncertainty, the LTC2912HDDB-3#TRPBF maintains ±1.5% accuracy across temperature while eliminating false resets from switching noise or ESD. This is confirmed in the Typical Performance Characteristics (Figure 2912 G05).
What is the minimum capacitor value required on the TMR pin of the LTC2912HDDB-3#TRPBF?
The minimum capacitor value required on the TMR pin of the LTC2912HDDB-3#TRPBF is 10pF. Capacitors smaller than 10pF may cause inconsistent timeout behavior due to parasitic effects and insufficient charge storage. A 1nF capacitor yields a typical timeout of 8.5ms (H-grade), scaling linearly per the formula CTMR = tUOTO × 115 × 10⁻⁹. Tying TMR directly to VCC disables the timeout function entirely - a valid option when immediate output response is required. This behavior is specified in the Electrical Characteristics table (tUOTO parameter).
Does the LTC2912HDDB-3#TRPBF support operation below 2.3V VCC?
Yes - the LTC2912HDDB-3#TRPBF guarantees UV and OV assertion down to VCC = 1V, though full specification compliance (e.g., ±1.5% threshold accuracy, 29µA ICC) applies only from VCC = 2.3V. Below 2.3V, the device remains functional: UV pulls low and OV pulls high (LTC2912-3) during power-up, providing reliable POR signaling even during slow-ramp or brownout conditions. This is explicitly stated in the Electrical Characteristics table under "Guaranteed OV and UV for VCC ≥ 1V".
LTC2912HDDB-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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2912HDDB-3#TRPBF FAQ
1.How can I place an order for LTC2912HDDB-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2912HDDB-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 LTC2912HDDB-3#TRPBF reliable?
The price and inventory of LTC2912HDDB-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 LTC2912HDDB-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2912HDDB-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2912HDDB-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2912HDDB-3#TRPBF?
LTC2912HDDB-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2912HDDB-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 LTC2912HDDB-3#TRPBF?
For technical support, including LTC2912HDDB-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2912HDDB-3#TRPBF requirements.
6.How does Aetrix verify that LTC2912HDDB-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2912HDDB-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 LTC2912HDDB-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2912HDDB-3#TRPBF?
All LTC2912HDDB-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2912HDDB-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 LTC2912HDDB-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC2912HDDB-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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