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Analog Devices Inc. LTC2919HDDB-3.3#TRPBF
- Part No.:
- LTC2919HDDB-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2919HDDB-3.3#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,607
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Product details
Overview
LTC2919HDDB-3.3#TRPBF from Analog Devices is a precision triple-input UV/OV monitor IC for system supply supervision, featuring two 0.5V adjustable inputs with ±1.5% threshold accuracy over –40°C to +125°C, a fixed 3.3V VCC UVLO input, open-drain RST/OUT1/OUT2 outputs, and internal 200ms reset timeout - deployed in core voltage monitoring for automotive engine control units.
For engineers reviewing the LTC2919HDDB-3.3#TRPBF datasheet, LTC2919HDDB-3.3#TRPBF pinout, LTC2919HDDB-3.3#TRPBF application, or LTC2919HDDB-3.3#TRPBF equivalent, this page delivers verified specifications, polarity-selectable dual-adjustable monitoring architecture, glitch-filtered timing behavior, and AEC-Q100–qualified thermal performance for high-reliability embedded power sequencing.
Technical Context
The LTC2919HDDB-3.3#TRPBF implements dual independent comparator channels with user-configurable input polarity (via three-state SEL pin), each referenced to a 0.5V nominal threshold with ±1.5% accuracy across temperature. Its third monitoring channel uses the VCC pin's built-in –10% UVLO (2.871V min) to supervise a 3.3V supply without external components.
Reset assertion logic requires all monitored inputs (ADJ1, ADJ2, VCC) to remain valid for the full timeout period before releasing RST; timeout is selectable via TMR pin (internal 200ms, external capacitor, or disabled). All outputs are open-drain with guaranteed low-state operation down to VCC = 0.5V and support pull-up to voltages exceeding VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Threshold | 2.871V (min) at –40°C to +125°C - enables direct 3.3V supply monitoring with guaranteed –10% trip point |
| ADJ Input Threshold | 492.5mV to 507.5mV - 0.5V nominal with ±1.5% accuracy over full temp range for precise UV/OV detection |
| Quiescent Current | 50µA (typ), 280µA (max) at H-grade - supports micropower operation in always-on automotive subsystems |
| Reset Timeout | 200ms (internal, TMR = GND) - provides deterministic power-up sequencing delay without external timing components |
| Operating Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade H for under-hood automotive applications |
| Package | 10-lead 3mm × 2mm DFN with exposed pad - enables compact layout and enhanced thermal dissipation in space-constrained ECUs |
| Output Type | Open-drain RST, OUT1, OUT2 - allows level-shifting, wired-OR logic, and compatibility with 1.8V–5.5V host systems |
Pinout & Package
Package: 10-lead (3mm × 2mm) plastic DFN with exposed thermal pad (Pin 11), rated for TJMAX = 150°C and 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 input | Determines ADJ1/ADJ2 polarity: VCC = both positive, OPEN = ADJ1+ / ADJ2–, GND = both negative - no external components required |
| VCC (Pin 2) | Power supply input with shunt regulator | Accepts 0.5V–6V directly; >6V operation enabled via series resistor and internal 6.5V shunt - also serves as 3.3V UVLO monitor |
| OUT1 (Pin 3) | Open-drain output 1 | Asserts low when ADJ1 violates configured UV/OV condition - supports pull-up to any voltage ≤7.5V |
| OUT2 (Pin 4) | Open-drain output 2 | Asserts low when ADJ2 violates configured UV/OV condition - independent of OUT1 for dual-rail fault isolation |
| RST (Pin 5) | Open-drain inverted reset output | Asserts low if any input (ADJ1, ADJ2, or VCC) fails; held low for full timeout after all inputs recover |
| GND (Pin 6) | Device ground reference | Primary return path for internal circuitry and REF output - must be low-impedance for accurate threshold stability |
| REF (Pin 7) | Buffered 1V reference output | Sources/sinks ±1mA; used to offset ADJ inputs for negative-supply monitoring - no bypass capacitor required |
| TMR (Pin 8) | Reset timeout configuration | GND = 200ms internal timeout; OPEN = ~400µs; VCC = comparator mode (no timeout); capacitor to GND sets custom delay (9ms/nF) |
| ADJ2 (Pin 9) | Adjustable voltage 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 voltage 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/(+)UV, or (–)UV/(–)OV - enables single-chip monitoring of mixed-polarity rails |
| Guaranteed low-state outputs | RST/OUT1/OUT2 sink current reliably down to VCC = 0.5V - prevents floating states during brownout and ensures deterministic power-up |
| Glitch-immune timing architecture | Combined propagation delay filtering (50–800µs) and configurable reset timeout eliminate false triggers from load transients and noise |
| Integrated 1V buffered reference | Stable REF output drives ADJ inputs for negative-supply monitoring without external op-amps or resistors - supports ±1mA load |
| AEC-Q100 Grade H qualification | Validated for –40°C to +125°C operation with full electrical test coverage - meets automotive reliability requirements for ECU and ADAS modules |
Applications
| Engine Control Unit (ECU) Core Voltage Supervision | Automotive Infotainment Power Sequencing |
|---|---|
Use Scenario: Monitoring 1.2V core CPU rail and 3.3V I/O rail in an automotive ECU, with VCC connected to main 3.3V supply. IC Role / Device Role / Timing Role: LTC2919HDDB-3.3#TRPBF acts as primary supervisor - ADJ1 monitors 1.2V via resistor divider, ADJ2 monitors 3.3V I/O, VCC monitors main 3.3V supply, and RST holds microcontroller in reset until all rails stabilize. Use Value: Ensures deterministic boot sequence with 200ms internal timeout; ±1.5% threshold accuracy prevents nuisance resets during transient load conditions in under-hood environments. |
Use Scenario: Coordinating power-up of SoC, display driver, and audio codec in a head-unit, where multiple supplies must meet strict sequencing windows. IC Role / Device Role / Timing Role: LTC2919HDDB-3.3#TRPBF supervises 5V main, 1.8V SoC, and 3.3V interface rails using SEL-configured polarity - OUT1/OUT2 signal individual rail status, RST gates system enable. Use Value: Eliminates need for discrete comparators and RC timers; open-drain outputs interface directly with 1.8V/3.3V logic; AEC-Q100 qualification ensures long-term field reliability. |
| Industrial Motor Drive DC Bus Monitoring | Server Baseboard Management Controller (BMC) |
Use Scenario: Detecting undervoltage on isolated –15V gate driver supply and overvoltage on +24V logic rail in a motor drive inverter stage. IC Role / Device Role / Timing Role: LTC2919HDDB-3.3#TRPBF uses SEL = GND to configure both ADJ inputs for negative polarity - ADJ1 monitors –15V (UV), ADJ2 monitors +24V (OV), RST disables PWM generation on fault. Use Value: Single IC replaces dual-channel comparator + reference + timer; REF pin offsets ADJ inputs for accurate negative-rail sensing; 125°C rating supports operation near power modules. |
Use Scenario: Providing redundant supply monitoring for BMC power domain in telecom servers, where 3.3V, 5V, and 12V rails require independent UV/OV detection. IC Role / Device Role / Timing Role: LTC2919HDDB-3.3#TRPBF monitors 3.3V via VCC UVLO and two additional rails via ADJ1/ADJ2; OUT1/OUT2 feed FPGA health registers, RST triggers BMC watchdog reset. Use Value: Micropower operation (50µA) minimizes BMC standby current; open-drain outputs simplify integration with FPGA I/O banks; DFN package fits dense server PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single 3.3V UVLO with fixed 200ms timeout; no adjustable inputs or polarity selection | Only monitors one fixed supply; lacks dual adjustable inputs and negative-rail capability | Select when only basic 3.3V supply supervision is needed - lower cost but no flexibility for multi-rail or mixed-polarity systems |
| MAX6326LT33D3+T | 3.3V UVLO with manual reset and watchdog; no ADJ inputs, no REF output, no polarity control | Designed for simple microprocessor reset only; no support for custom thresholds or negative supplies | Choose for legacy designs requiring manual reset functionality and minimal feature set - not suitable for dual-rail or automotive AEC-Q100 use |
Compared with TPS3808G33DBVR and MAX6326LT33D3+T, the LTC2919HDDB-3.3#TRPBF provides unique dual adjustable inputs with polarity selection, integrated 1V reference, and AEC-Q100 qualification - making it the only option capable of replacing discrete supervision circuits in high-reliability automotive and industrial multi-rail systems.
Availability
LTC2919HDDB-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, and telecom server baseboard management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2919HDDB-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-input voltage supervisors designed specifically for mission-critical power sequencing in automotive, industrial, and computing systems where reliability and accuracy are non-negotiable.
FAQ
What is the operating temperature range for the LTC2919HDDB-3.3#TRPBF?
The LTC2919HDDB-3.3#TRPBF is rated for –40°C to +125°C and qualified per AEC-Q100 Grade H. This specification is confirmed in the "Order Information" table and "Electrical Characteristics" section of the datasheet, where H-grade parts are explicitly defined with that temperature range and validated for automotive under-hood applications.
How does the SEL pin configure input polarity on the LTC2919HDDB-3.3#TRPBF?
The SEL pin on the LTC2919HDDB-3.3#TRPBF selects polarity for ADJ1 and ADJ2: connecting SEL to VCC sets both inputs to positive polarity (UV/OV for positive rails); leaving SEL open sets ADJ1 positive and ADJ2 negative; connecting SEL to GND sets both to negative polarity. This is documented in Table 1 ("Voltage Threshold Selection") and the "PIN FUNCTIONS" section.
Can the LTC2919HDDB-3.3#TRPBF monitor a negative supply voltage?
Yes - the LTC2919HDDB-3.3#TRPBF can monitor negative supplies by configuring ADJ1 or ADJ2 for negative polarity via the SEL pin and referencing the input to the buffered 1V REF output. For example, a –5V rail is monitored by connecting ADJ1 to a resistor divider between –5V and REF, with SEL = GND or OPEN as required. This is demonstrated in Table 2a and the "Adjust Input Trip Point" application note.
What is the reset timeout behavior when the TMR pin is grounded on the LTC2919HDDB-3.3#TRPBF?
When the TMR pin is tied to GND, the LTC2919HDDB-3.3#TRPBF activates its internal 200ms reset timeout. This value is specified in the "ELECTRICAL CHARACTERISTICS" table as tRST(INT), with min/typ/max of 140ms/200ms/280ms over temperature. The timeout begins only after all monitored inputs (ADJ1, ADJ2, VCC) have been valid for the full duration.
Does the LTC2919HDDB-3.3#TRPBF require external components for basic 3.3V supply monitoring?
No - for basic 3.3V supply monitoring, only a 0.1µF bypass capacitor on VCC is required. The VCC pin provides a built-in –10% UVLO (2.871V min), eliminating external resistors or references. ADJ1 and ADJ2 may be left unconnected (with appropriate SEL configuration), and TMR may be grounded for fixed 200ms timeout - enabling a minimal 3-component implementation.
LTC2919HDDB-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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LTC2919HDDB-3.3#TRPBF FAQ
1.How can I place an order for LTC2919HDDB-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2919HDDB-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 LTC2919HDDB-3.3#TRPBF reliable?
The price and inventory of LTC2919HDDB-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 LTC2919HDDB-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2919HDDB-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2919HDDB-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2919HDDB-3.3#TRPBF?
LTC2919HDDB-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2919HDDB-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 LTC2919HDDB-3.3#TRPBF?
For technical support, including LTC2919HDDB-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2919HDDB-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC2919HDDB-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2919HDDB-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 LTC2919HDDB-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2919HDDB-3.3#TRPBF?
All LTC2919HDDB-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2919HDDB-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 LTC2919HDDB-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC2919HDDB-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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