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Analog Devices Inc. LTC2919CDDB-3.3#TRPBF
- Part No.:
- LTC2919CDDB-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2919CDDB-3.3#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,375
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Product details
Overview
LTC2919CDDB-3.3#TRPBF from Analog Devices is a precision triple-input UV/OV monitor IC for system power supervision, featuring two 0.5V adjustable inputs with ±1.5% threshold accuracy over 0°C to 70°C, a fixed 3.3V VCC UVLO (2.871V–2.970V), open-drain RST/OUT1/OUT2 outputs, and internal 200ms reset timeout - used in desktop/server core voltage monitoring and automotive I/O rail supervision.
For engineers reviewing the LTC2919CDDB-3.3#TRPBF datasheet, LTC2919CDDB-3.3#TRPBF pinout, LTC2919CDDB-3.3#TRPBF application, or LTC2919CDDB-3.3#TRPBF equivalent, key selection criteria include guaranteed 0.5V ADJ threshold accuracy, VCC UVLO tolerance for 3.3V supplies, glitch-filtered dual-comparator response, and DFN-10 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC2919CDDB-3.3#TRPBF implements dual independent voltage comparators with user-selectable polarity (via three-state SEL pin) and a dedicated VCC UVLO circuit. Its 0.5V nominal ADJ thresholds are referenced to an internal buffered 1.000V reference, enabling precise negative-supply monitoring when offset against REF.
Reset behavior is configurable via TMR pin: tied to GND enables internal 200ms timeout; left open yields ~400μs; connected to capacitor sets external timeout (9ms/nF); tied to VCC disables timeout and enters comparator mode. All outputs remain low down to VCC = 0.5V, ensuring reliable power-up sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Threshold | 2.871V–2.970V (–10% of 3.3V, ±1.5% accuracy) - directly monitors 3.3V supply undervoltage without external divider. |
| ADJ Input Threshold | 495mV–505mV (0.5V ±1.5%) - enables accurate UV/OV detection on two independent rails using resistor dividers. |
| Quiescent Current | 50µA typical (C-grade, 2.175V < VCC < 6V) - supports micropower battery-backed or always-on supervision. |
| Reset Timeout | 200ms internal (TMR = GND) - provides standardized brownout recovery delay compliant with Intel VRD and PCIe specs. |
| Output Type | Open-drain RST/OUT1/OUT2 - allows level-shifting, wired-OR logic, and pull-up to any voltage ≤7.5V (e.g., 1.8V, 3.3V, 5V). |
| Reference Output | 1.000V ±10mV buffered REF - sources/sinks ±1mA, drives up to 1000pF, enables negative-rail monitoring with offset. |
| Operating Temp | 0°C to 70°C - commercial-grade temperature range suitable for desktop, networking, and industrial control applications. |
Pinout & Package
Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (DDB). RoHS-compliant, lead-free finish. Thermal resistance θJA = 76°C/W. Exposed pad may be left unconnected or tied to GND for improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 1) | Three-state polarity select | Determines ADJ1/ADJ2 input polarity: VCC = both positive, GND = both negative, open = ADJ1+, ADJ2− - enables UV/OV detection on mixed-rail systems without external logic. |
| VCC (Pin 2) | Power supply input | Operates from 0.5V–6V; includes 6.5V shunt regulator for high-voltage operation; also serves as third monitored supply (3.3V UVLO). |
| OUT1 (Pin 3) | Adjustable input 1 status output | Open-drain; asserts low when ADJ1 invalid per selected polarity - used for per-rail fault indication or sequenced enable signals. |
| OUT2 (Pin 4) | Adjustable input 2 status output | Open-drain; independent of OUT1 - supports dual-rail monitoring with separate fault reporting paths. |
| RST (Pin 5) | System reset output | Open-drain; asserts low if any input (ADJ1, ADJ2, or VCC) fails; held low for timeout after all inputs recover - primary system reset source. |
| GND (Pin 6) | Ground reference | Primary return path for all analog and digital functions; exposed pad (Pin 11) may be connected here for thermal relief. |
| REF (Pin 7) | Buffered 1V reference | Stable 1.000V output; drives negative-monitoring dividers; eliminates need for external reference in dual-polarity designs. |
| TMR (Pin 8) | Reset timeout control | Selects timing mode: GND = 200ms internal, cap-to-GND = 9ms/nF, open = ~400μs, VCC = comparator mode - configures reset behavior without firmware. |
| ADJ2 (Pin 9) | Adjustable input 2 | 0.5V threshold comparator input; polarity set by SEL; tie to GND if unused (with SEL = GND or open). |
| ADJ1 (Pin 10) | Adjustable input 1 | 0.5V threshold comparator input; polarity set by SEL; tie to REF if unused (with SEL = VCC or open). |
Key Features
| Feature | Design Value |
|---|---|
| Polarity-selectable dual inputs | SEL pin configures ADJ1/ADJ2 as (+)UV/(–)OV, (–)UV/(+)OV, or both positive - enables single IC to monitor +5V UV + –12V OV without redesign. |
| Guaranteed low outputs at low VCC | RST/OUT1/OUT2 sink current reliably down to VCC = 0.5V - ensures deterministic reset assertion during deep brownout or cold-start conditions. |
| Glitch-immune propagation delay | 50–800µs delay vs. overdrive (5mV min.) - filters sub-microsecond noise spikes on ADJ inputs without degrading DC accuracy. |
| Accurate buffered 1V reference | ±10mV max. error over temp; ±1mA drive capability - replaces external reference IC in negative-supply monitoring circuits. |
| Space-saving DFN-10 package | 3mm × 2mm footprint with 0.5mm pitch - reduces board area by >40% vs. MSOP-10 while maintaining thermal performance (θJA = 76°C/W). |
Applications
| Desktop Core Voltage Monitoring | Automotive I/O Rail Supervision |
|---|---|
|
Use Scenario: Monitors 1.2V CPU core and 3.3V I/O supplies in x86-based desktop motherboards during power-up, brownout, and thermal throttling events. IC Role / Device Role / Timing Role: Triple-input supervisor providing independent OUT1/OUT2 fault flags and synchronized RST with 200ms timeout for BIOS initialization compliance. Use Value: Eliminates need for discrete resistors and comparators; ±1.5% threshold accuracy prevents nuisance resets during transient load steps. |
Use Scenario: Supervises 5V CAN transceiver and 12V sensor bias rails in automotive body control modules under wide-temperature and EMI-heavy conditions. IC Role / Device Role / Timing Role: Dual-rail monitor with polarity-selectable inputs detects both UV on 5V and OV on 12V; RST holds microcontroller in reset until both rails stabilize. Use Value: SEL pin enables single-part solution for mixed-polarity faults; open-drain outputs interface directly with 5V-tolerant MCU reset pins. |
| Network Server PSU Sequencing | Industrial PLC Power Integrity |
|
Use Scenario: Validates 3.3V management controller supply and –48V telecom line card bias in 1U rack servers with strict power-good timing requirements. IC Role / Device Role / Timing Role: Uses REF pin to offset ADJ2 for –48V UV detection; VCC UVLO monitors 3.3V rail; RST coordinates FPGA configuration sequence. Use Value: Internal 200ms timeout satisfies ATX PS_ON hold-time specs; 50µA quiescent current minimizes standby loss in multi-rail PSUs. |
Use Scenario: Ensures clean startup of 24V fieldbus and 5V logic supplies in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Configured with ADJ1 = 24V UV, ADJ2 = 5V OV, SEL = VCC; RST blocks I/O initialization until both rails meet tolerance bands. Use Value: ±1.5% threshold accuracy over 0°C–70°C guarantees no false trips across ambient temperature swings; DFN package withstands reflow and vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single 3.3V UVLO only; no adjustable inputs or polarity selection; 200ms fixed timeout; 2.5µA IQ | Monitors only VCC - cannot replace dual-rail or negative-supply supervision capability of LTC2919CDDB-3.3#TRPBF | Choose only if supervising one 3.3V rail with ultra-low IQ requirement and no ADJ functionality needed. |
| MAX6326–33D3+T | Fixed 3.3V UVLO with manual reset; no OV detection, no ADJ inputs, no REF output; 1.6µA IQ | Provides basic reset only - lacks dual-comparator architecture, polarity flexibility, and buffered reference of LTC2919CDDB-3.3#TRPBF | Select when cost-sensitive designs require minimal reset functionality without rail monitoring intelligence. |
Compared with TPS3808G33DBVR and MAX6326–33D3+T, the LTC2919CDDB-3.3#TRPBF delivers unique dual-adjustable-input supervision with polarity selection and integrated 1V reference - enabling compact, high-accuracy monitoring of mixed positive/negative rails where alternatives require multiple ICs or external components.
Availability
LTC2919CDDB-3.3#TRPBF is available at Aetrix Electronics and suitable for desktop computing, network server power sequencing, and automotive I/O rail supervision requiring stable component supply and commercial-temperature grade reliability.
Supply support for LTC2919CDDB-3.3#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 since 1965.
The LTC2919 product line delivers precision, low-power, multi-rail voltage supervision ICs designed for mission-critical power integrity in computing, networking, and automotive electronics - emphasizing threshold accuracy, glitch immunity, and flexible configuration.
FAQ
What is the VCC UVLO threshold range for LTC2919CDDB-3.3#TRPBF?
The LTC2919CDDB-3.3#TRPBF has a guaranteed VCC UVLO threshold range of 2.871V to 2.970V (–10% of 3.3V, ±1.5% accuracy) over its full 0°C to 70°C operating temperature range. This allows direct monitoring of a 3.3V supply without external resistor dividers, and the hysteresis is specified at 0.3–2.0% to prevent chatter near the trip point.
How does the SEL pin configure input polarity on LTC2919CDDB-3.3#TRPBF?
The SEL pin on LTC2919CDDB-3.3#TRPBF selects ADJ1/ADJ2 polarity via three states: tied to VCC sets both inputs to positive polarity (for +UV/+OV), tied to GND sets both to negative polarity (for –UV/–OV), and left open configures ADJ1 as positive and ADJ2 as negative - enabling detection of +5V UV and –12V OV simultaneously without external logic.
Can LTC2919CDDB-3.3#TRPBF monitor negative voltages?
Yes, LTC2919CDDB-3.3#TRPBF can monitor negative voltages using its buffered 1.000V REF output as an offset. When SEL is set to GND or open, ADJ1 or ADJ2 operate in negative polarity mode: a –5V supply is monitored by referencing ADJx to REF and scaling with a resistor divider so the ADJx pin sees 0.5V when the supply reaches –4.75V (–5% UV).
What is the minimum VCC voltage required for LTC2919CDDB-3.3#TRPBF to assert valid outputs?
LTC2919CDDB-3.3#TRPBF guarantees RST, OUT1, and OUT2 outputs remain low down to VCC = 0.5V, with VOL ≤ 0.15V at 2500µA sink current. This ensures deterministic reset assertion during deep brownout or cold-start conditions before the 3.3V rail reaches regulation, critical for safe FPGA/CPU initialization.
Does LTC2919CDDB-3.3#TRPBF support external reset timeout capacitors?
Yes, LTC2919CDDB-3.3#TRPBF supports external timeout capacitors on the TMR pin. With CTMR connected to GND, timeout = 9ms/nF (e.g., 22nF → 200ms). Ceramic capacitors with ≤100pA leakage are recommended; values >1µF (9s timeout) are not advised due to accuracy degradation and long recovery times.
LTC2919CDDB-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.921V, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LTC2919CDDB-3.3#TRPBF FAQ
1.How can I place an order for LTC2919CDDB-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2919CDDB-3.3#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 LTC2919CDDB-3.3#TRPBF reliable?
The price and inventory of LTC2919CDDB-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2919CDDB-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2919CDDB-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2919CDDB-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2919CDDB-3.3#TRPBF?
LTC2919CDDB-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2919CDDB-3.3#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 LTC2919CDDB-3.3#TRPBF?
For technical support, including LTC2919CDDB-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2919CDDB-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC2919CDDB-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2919CDDB-3.3#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 LTC2919CDDB-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2919CDDB-3.3#TRPBF?
All LTC2919CDDB-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2919CDDB-3.3#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 LTC2919CDDB-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC2919CDDB-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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