My Inquiry
My Account
Analog Devices Inc. LTC2919CDDB-2.5#TRMPBF
- Part No.:
- LTC2919CDDB-2.5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2919CDDB-2.5#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,253
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2919CDDB-2.5#TRMPBF from Analog Devices is a precision triple-input voltage supervisor IC with two adjustable 0.5V-threshold inputs and a fixed 2.5V supply UVLO monitor, featuring ±1.5% threshold accuracy over 0°C to 70°C, 50µA quiescent current, and open-drain RST/OUT1/OUT2 outputs for power sequencing in desktop computers and network servers.
For engineers reviewing the LTC2919CDDB-2.5#TRMPBF datasheet, LTC2919CDDB-2.5#TRMPBF pinout, LTC2919CDDB-2.5#TRMPBF application, or LTC2919CDDB-2.5#TRMPBF equivalent, key selection factors include its dual-polarity ADJ input configuration via SEL pin, internal 200ms reset timeout, buffered 1V reference for negative rail offset, and DFN-10 (3mm × 2mm) package compatibility with space-constrained embedded power monitoring designs.
Technical Context
The LTC2919CDDB-2.5#TRMPBF implements three independent voltage comparators: two adjustable inputs (ADJ1/ADJ2) with nominal 0.5V thresholds and polarity selectable via three-state SEL pin, plus a dedicated VCC UVLO comparator set for 2.5V supply (2.175V to 2.250V trip range). All comparators feed into glitch-filtered logic driving open-drain outputs.
Reset behavior is configurable via TMR pin: tied to GND enables internal 200ms timeout, connected to capacitor sets external timeout (9ms/nF), or tied to VCC disables timeout for comparator-mode direct output mapping. The buffered 1V REF output supports negative-supply monitoring by offsetting ADJ inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Threshold | 2.175V to 2.250V - precisely monitors 2.5V supply for undervoltage at –10% tolerance with guaranteed operation across 0°C–70°C. |
| ADJ Input Threshold | 495mV to 505mV - 0.5V nominal threshold with ±1.5% accuracy enables accurate UV/OV detection on user-defined rails. |
| Quiescent Current | 50µA typical - ultra-low power consumption supports always-on monitoring in battery-backed or energy-sensitive systems. |
| Reset Timeout | 200ms internal or 15–27ms with 2.2nF capacitor - configurable delay prevents false resets during transient supply disturbances. |
| Output Type | Open-drain RST, OUT1, OUT2 - allows level-shifting, wired-OR logic, and pull-up to voltages exceeding VCC (up to 7.5V). |
| Reference Output | 0.990V to 1.010V buffered 1V REF - provides stable offset for negative-rail monitoring without external components. |
| Operating Temp | 0°C to 70°C - commercial-grade temperature range suitable for desktop, server, and industrial control applications. |
Pinout & Package
Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 11), RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 1) | Three-state polarity select | Determines ADJ1/ADJ2 input polarity: VCC = both positive, OPEN = ADJ1+, ADJ2−, GND = both negative - enables UV/OV monitoring on mixed-sign rails. |
| VCC (Pin 2) | Power supply input | Operates from 0.5V to 6V directly; includes 6.5V shunt regulator for high-voltage operation with series resistor - also serves as third monitored supply. |
| OUT1 (Pin 3) | Adjustable input 1 status | Asserts low when ADJ1 is invalid (UV for +polarity, OV for −polarity); open-drain allows flexible pull-up voltage and logic interfacing. |
| OUT2 (Pin 4) | Adjustable input 2 status | Asserts low when ADJ2 is invalid; independent of OUT1 - supports dual-rail fault isolation in multi-supply systems. |
| RST (Pin 5) | Combined reset output | Asserts low if any monitored input (ADJ1, ADJ2, or VCC) fails; held low for timeout period after all inputs recover - ensures clean system reset. |
| GND (Pin 6) | Ground reference | Primary return path for all internal circuitry and REF output - exposed pad (Pin 11) may be tied to GND for improved thermal performance. |
| REF (Pin 7) | Buffered 1V reference | Sources/sinks up to 1mA; used to offset ADJ inputs for negative-supply monitoring - no bypass capacitor required. |
| TMR (Pin 8) | Reset timeout control | GND = 200ms internal timeout, capacitor = external timeout (9ms/nF), VCC = comparator mode (no timeout), OPEN = ~400µs minimum. |
| 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 for +UV/−OV, +UV/+OV, or −UV/−OV monitoring - eliminates need for external polarity-reversal circuitry. |
| Triple independent monitoring | Simultaneous supervision of two user-defined rails (via ADJ1/ADJ2) and fixed 2.5V VCC supply - reduces BOM count vs. discrete supervisors. |
| Glitch-immune timing architecture | Combined propagation delay filtering (50–800µs) and configurable reset timeout prevent false triggering from supply noise or transients. |
| Low-voltage output drive | RST/OUT1/OUT2 guaranteed low down to VCC = 0.5V - ensures deterministic reset assertion during brownout and power-up sequencing. |
| Space-optimized packaging | 3mm × 2mm DFN-10 footprint saves >40% board area vs. MSOP-10 - ideal for compact computing and telecom modules. |
Applications
| Desktop Power Sequencing | Network Server Core Monitoring |
|---|---|
|
Use Scenario: Monitoring 12V, 3.3V, and 2.5V rails in ATX-compliant desktop motherboards during cold start and brownout events. IC Role / Device Role / Timing Role: LTC2919CDDB-2.5#TRMPBF acts as primary supervisor, asserting RST until all supplies stabilize within tolerance and holding reset for 200ms post-recovery. Use Value: Prevents CPU lockup by ensuring memory, chipset, and I/O rails are valid before release; SEL pin enables single IC to monitor mixed positive rails without external op-amps. |
Use Scenario: Supervising dual-core processor VDD and auxiliary 2.5V I/O supply in 1U rack-mounted servers with tight thermal constraints. IC Role / Device Role / Timing Role: LTC2919CDDB-2.5#TRMPBF provides independent OUT1/OUT2 fault flags and combined RST with internal 200ms timeout for coordinated power-good signaling. Use Value: 50µA quiescent current minimizes standby loss; DFN-10 package fits under heatsink footprints; REF output offsets ADJ inputs for precise 1.8V core rail monitoring. |
| Automotive Infotainment Supply Check | Industrial PLC Power Integrity |
|
Use Scenario: Validating 5V USB host supply and –12V display bias rail in AEC-Q100-compliant infotainment head units. IC Role / Device Role / Timing Role: LTC2919CDDB-2.5#TRMPBF uses SEL = OPEN to configure ADJ1 for +UV (5V) and ADJ2 for −OV (–12V), with REF providing 1V offset for negative rail sensing. Use Value: Eliminates need for separate positive/negative supervisors; ±1.5% threshold accuracy ensures compliance with automotive supply tolerance specs across temperature. |
Use Scenario: Monitoring isolated 24V field bus supply and 3.3V microcontroller rail in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: LTC2919CDDB-2.5#TRMPBF leverages VCC UVLO for 2.5V logic supply and ADJ inputs for scaled-down 24V and 3.3V rails using resistor dividers. Use Value: 6.5V shunt regulator on VCC allows direct connection to 24V bus with series resistor; glitch filtering prevents spurious resets from motor-drive EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3V UVLO only; no adjustable inputs or polarity selection; 1.8µA IQ; SOT-23-6 package. | Supports single-rail monitoring only; lacks dual-adjustable capability and negative rail support. | Select when only 3.3V supply monitoring is needed and ultra-low IQ is critical; not suitable for dual-rail or mixed-polarity use cases. |
| MAX6816EUT+T | Single 0.63V threshold; no VCC UVLO; push-pull RST; 10µA IQ; SOT-23-6 package. | Provides basic UV detection only; no OV capability, no REF output, no timeout configuration. | Choose for cost-sensitive, single-threshold applications where reset timing and polarity flexibility are unnecessary. |
Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2919CDDB-2.5#TRMPBF delivers unique triple-monitoring capability with polarity-selectable inputs and buffered reference-enabling compact, accurate supervision of complex multi-rail systems where alternatives require multiple ICs or external components.
Availability
LTC2919CDDB-2.5#TRMPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and industrial PLCs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC2919CDDB-2.5#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 computing markets since 1965.
The LTC2919 product line delivers precision, low-power voltage supervision ICs optimized for multi-rail systems in computing and infrastructure equipment, with emphasis on threshold accuracy, glitch immunity, and space-constrained packaging.
FAQ
What is the function of the SEL pin on the LTC2919CDDB-2.5#TRMPBF?
The SEL pin on the LTC2919CDDB-2.5#TRMPBF is a three-state input that selects polarity for ADJ1 and ADJ2: tied to VCC configures both for positive-rail UV monitoring, tied to GND configures both for negative-rail UV, and left open configures ADJ1 for positive UV and ADJ2 for negative OV. This eliminates external polarity-reversal circuitry and enables flexible fault detection on mixed-sign rails without changing the LTC2919CDDB-2.5#TRMPBF hardware layout.
How does the LTC2919CDDB-2.5#TRMPBF achieve accurate 2.5V supply monitoring?
The LTC2919CDDB-2.5#TRMPBF achieves accurate 2.5V supply monitoring through its dedicated VCC UVLO comparator, which triggers reset when VCC falls below 2.175V to 2.250V (–10% ±0.75% tolerance). This specification applies across the full 0°C to 70°C operating range and is independent of the adjustable ADJ inputs - ensuring reliable detection of 2.5V rail faults without external resistive dividers or calibration.
Can the LTC2919CDDB-2.5#TRMPBF monitor negative voltages?
Yes, the LTC2919CDDB-2.5#TRMPBF can monitor negative voltages using its buffered 1V REF output as an offset: connect the negative rail to ADJ1 or ADJ2 through a resistor divider referenced to REF instead of GND. When SEL is configured for negative polarity, the LTC2919CDDB-2.5#TRMPBF detects undervoltage (e.g., –4.3V on a –5V rail) or overvoltage (e.g., –5.7V) based on the 0.5V internal threshold relative to REF.
What is the purpose of the TMR pin on the LTC2919CDDB-2.5#TRMPBF?
The TMR pin on the LTC2919CDDB-2.5#TRMPBF controls reset timeout behavior: tying it to GND activates the internal 200ms timer, connecting a capacitor to GND sets external timeout (9ms/nF), and tying it to VCC disables timeout for direct comparator-mode output mapping. This configurability allows designers to balance glitch immunity against reset response speed without modifying the LTC2919CDDB-2.5#TRMPBF schematic or layout.
Does the LTC2919CDDB-2.5#TRMPBF require external components for basic operation?
The LTC2919CDDB-2.5#TRMPBF requires minimal external components for basic operation: a 0.1µF bypass capacitor on VCC, pull-up resistors on RST/OUT1/OUT2 (typically 10kΩ), and resistor dividers on ADJ1/ADJ2 to set trip points. No external hysteresis, polarity-reversal circuits, or reference buffers are needed - the integrated REF output, SEL pin, and glitch-filtered comparators enable full functionality with fewer than five passive components per monitored rail.
LTC2919CDDB-2.5#TRMPBF 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:
- 2.213V, 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-2.5#TRMPBF FAQ
1.How can I place an order for LTC2919CDDB-2.5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2919CDDB-2.5#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 LTC2919CDDB-2.5#TRMPBF reliable?
The price and inventory of LTC2919CDDB-2.5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2919CDDB-2.5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2919CDDB-2.5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2919CDDB-2.5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2919CDDB-2.5#TRMPBF?
LTC2919CDDB-2.5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2919CDDB-2.5#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 LTC2919CDDB-2.5#TRMPBF?
For technical support, including LTC2919CDDB-2.5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2919CDDB-2.5#TRMPBF requirements.
6.How does Aetrix verify that LTC2919CDDB-2.5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2919CDDB-2.5#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 LTC2919CDDB-2.5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2919CDDB-2.5#TRMPBF?
All LTC2919CDDB-2.5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2919CDDB-2.5#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 LTC2919CDDB-2.5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2919CDDB-2.5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2919CDDB-2.5#TRMPBF Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
