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Analog Devices Inc. LTC2919HMS-3.3#PBF
- Part No.:
- LTC2919HMS-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2919HMS-3.3#PBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,501
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Product details
Overview
LTC2919HMS-3.3#PBF 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 (2.871V nominal trip), open-drain RST/OUT1/OUT2 outputs, and internal 200ms reset timeout - deployed in automotive power sequencing and industrial PLC voltage integrity monitoring.
For engineers reviewing the LTC2919HMS-3.3#PBF datasheet, LTC2919HMS-3.3#PBF pinout, LTC2919HMS-3.3#PBF application, or LTC2919HMS-3.3#PBF equivalent, this page delivers verified pin functions, temperature-grade–specific electrical behavior, polarity-selectable dual-adjustable monitoring architecture, and real-world fault-detection configurations for 3.3V logic-compatible systems.
Technical Context
The LTC2919HMS-3.3#PBF implements dual independent comparators with user-configurable input polarity (via three-state SEL pin) and a dedicated VCC UVLO comparator, all sharing a buffered 1.000V reference for negative-supply offset. Its glitch-filtered propagation delay (50–800 µs) and configurable reset timeout (internal 200ms, external capacitor, or disabled) ensure robust response to brownouts and transients.
It operates from 0.5V to 6V VCC, includes a 6.5V shunt regulator for high-voltage supply compatibility, guarantees output low state down to VCC = 0.5V (VOL ≤ 0.15V @ 2.5mA), and supports negative-supply monitoring via REF-biased ADJ inputs - all in a 10-lead MSOP package qualified per AEC-Q100 Grade H (–40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Threshold | 2.871V (nominal), –10% of 3.3V supply - enables precise 3.3V rail undervoltage detection without external components |
| ADJ Input Threshold | 492.5mV to 507.5mV (±1.5% over temp) - tight tolerance ensures reliable UV/OV trip points across automotive temperature range |
| Quiescent Current | 50µA (typ), ≤280µA (max at +125°C) - ultra-low power enables always-on monitoring in battery-backed systems |
| Reset Timeout | 200ms (internal, TMR = GND) - factory-trimmed timing eliminates external capacitor and reduces BOM count |
| Output Type | Open-drain RST, OUT1, OUT2 - supports level-shifting, wired-OR logic, and pull-up to any voltage ≤7.5V (e.g., 3.3V or 5V logic) |
| Reference Output | 1.000V buffered REF (±10mV over temp, ±1mA drive) - provides stable offset for negative-supply monitoring circuits |
| Operating Temp | –40°C to +125°C (H-grade) - meets AEC-Q100 requirements for under-hood automotive and industrial control applications |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm), exposed pad optional, RoHS-compliant, AEC-Q100 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 1) | Three-state polarity select | Configures ADJ1/ADJ2 as (+)UV/(–)OV, (+)UV/(+)UV, or (–)UV/(–)OV - no external components required |
| VCC (Pin 2) | Power supply input | Operates directly up to 6V; internal 6.5V shunt enables >6V operation with series resistor - also serves as third monitored supply |
| OUT1 (Pin 3) | Adjustable input 1 status | Asserts low when ADJ1 is invalid (UV/OV per SEL setting); open-drain allows flexible pull-up voltage selection |
| OUT2 (Pin 4) | Adjustable input 2 status | Asserts low when ADJ2 is invalid; independent of OUT1 - enables discrete fault indication for dual-rail systems |
| RST (Pin 5) | Master reset output | Inverted open-drain output held low until both ADJ inputs AND VCC are valid for full timeout period - ensures synchronized system reset |
| GND (Pin 6) | 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 | Drives negative-monitoring resistor dividers; sources/sinks ±1mA - eliminates need for external reference in bipolar supply designs |
| TMR (Pin 8) | Reset timeout control | GND = 200ms internal timeout; open = ~400µs min; VCC = comparator mode (no timeout); capacitor = 9ms/nF programmable delay |
| ADJ2 (Pin 9) | Adjustable input 2 | 0.5V threshold comparator input; polarity set by SEL - tied to GND if unused (with SEL = GND or OPEN) |
| ADJ1 (Pin 10) | Adjustable input 1 | 0.5V threshold comparator input; polarity set by SEL - tied to REF if unused (with SEL = VCC or OPEN) |
Key Features
| Feature | Design Value |
|---|---|
| Polarity-selectable dual monitoring | Single SEL pin configures ADJ1/ADJ2 for positive/negative UV/OV detection - eliminates need for separate positive/negative supervisors |
| Triple independent inputs | Two adjustable (0.5V) + one fixed 3.3V VCC UVLO - monitors primary rail, auxiliary rail, and core supply with one IC |
| Guaranteed low output at low VCC | Outputs sink current and assert valid low state down to VCC = 0.5V - prevents floating states during brownout and power-up |
| Internal 200ms timeout | No external capacitor required for standard reset hold time - reduces component count, PCB area, and calibration risk |
| AEC-Q100 Grade H qualification | Validated for –40°C to +125°C operation with full parametric testing - suitable for automotive engine control and ADAS power domains |
| Glitch-immune timing architecture | Combined comparator propagation delay filtering (50–800 µs) and reset timeout prevents false triggers from load transients and EMI |
Applications
| Automotive Power Sequencing | Industrial PLC I/O Module Supervision |
|---|---|
Use Scenario: Monitoring 3.3V microcontroller core supply, 12V CAN transceiver rail, and –5V analog sensor bias in an engine control unit. IC Role / Device Role / Timing Role: LTC2919HMS-3.3#PBF acts as triple-rail supervisor with SEL configured for mixed-polarity detection; RST holds MCU in reset until all rails stabilize post-ignition. Use Value: Eliminates three discrete supervisors; internal 200ms timeout ensures deterministic boot sequence without external timing components. |
Use Scenario: Supervising 3.3V FPGA configuration voltage, 24V field I/O supply, and –15V op-amp bias in a modular PLC backplane. IC Role / Device Role / Timing Role: LTC2919HMS-3.3#PBF uses REF-biased ADJ2 to monitor –15V rail while ADJ1 tracks 24V via resistor divider; RST gates FPGA startup until all supplies are valid. Use Value: Single-chip solution replaces dual-supervisor + reference IC; ±1.5% threshold accuracy over temperature prevents nuisance resets in uncooled enclosures. |
| Server Board Core Voltage Monitor | Medical Imaging Power Integrity |
Use Scenario: Detecting undervoltage on 3.3V PCIe slot power and overvoltage on 12V CPU VRM input in a rack-mounted server motherboard. IC Role / Device Role / Timing Role: LTC2919HMS-3.3#PBF configured with SEL = OPEN to monitor both rails for UV (3.3V) and OV (12V); OUT1/OUT2 provide independent fault flags to BMC. Use Value: Enables early-failure diagnostics without adding complexity; open-drain outputs interface directly with 3.3V BMC GPIOs. |
Use Scenario: Ensuring integrity of 3.3V digital logic, ±15V analog front-end, and –5V detector bias in a CT scanner power subsystem. IC Role / Device Role / Timing Role: LTC2919HMS-3.3#PBF uses REF to offset ADJ1 for –15V monitoring and ADJ2 for –5V; RST disables imaging chain if any rail faults. Use Value: Buffered 1V REF eliminates external op-amp for negative rail scaling; AEC-Q100 H-grade reliability meets medical safety-critical uptime requirements. |
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 200ms timeout; no adjustable inputs or negative monitoring capability | Only monitors VCC rail - cannot replace dual-rail or bipolar supervision function of LTC2919HMS-3.3#PBF | Select only when supervising one fixed 3.3V supply with no auxiliary rail or polarity flexibility needed |
| MAX6326LT33D2T | 3.3V UVLO with manual reset and watchdog; lacks ADJ inputs, REF output, and SEL polarity control | No support for custom thresholds, negative supplies, or independent fault flagging - limited to basic reset generation | Choose for cost-sensitive, single-rail applications where design simplicity outweighs feature flexibility |
Compared with TPS3808G33DBVR and MAX6326LT33D2T, the LTC2919HMS-3.3#PBF uniquely integrates dual adjustable monitoring, polarity selection, buffered reference, and triple-input supervision - making it irreplaceable in systems requiring coordinated multi-rail fault detection without external components.
Availability
LTC2919HMS-3.3#PBF is available at Aetrix Electronics and suitable for automotive power sequencing, industrial PLC I/O supervision, server board core voltage monitoring, and medical imaging power integrity applications requiring stable component supply across extended temperature ranges.
Supply support for LTC2919HMS-3.3#PBF 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 industrial, automotive, communications, and healthcare markets.
The LTC2919 product line delivers precision, low-power, multi-rail voltage supervisors with configurable polarity and integrated reference - designed specifically for mission-critical power integrity in automotive and industrial control systems.
FAQ
What is the guaranteed operating temperature range for LTC2919HMS-3.3#PBF?
The LTC2919HMS-3.3#PBF is rated for –40°C to +125°C and qualified per AEC-Q100 Grade H. This specification is validated across all key parameters including ADJ threshold accuracy (±1.5%), VCC UVLO (2.871V nominal), quiescent current (≤280µA), and output low voltage (≤0.15V @ 2.5mA), ensuring reliable operation in under-hood automotive and industrial environments.
How does the SEL pin configure polarity for ADJ1 and ADJ2 on LTC2919HMS-3.3#PBF?
On the LTC2919HMS-3.3#PBF, the SEL pin selects polarity combinations: tied to VCC enables (+)UV/(+)UV; left open enables (+)UV/(–)OV; tied to GND enables (–)UV/(–)OV. Each configuration determines whether a given ADJ input asserts low for undervoltage (positive polarity) or overvoltage (negative polarity), enabling detection of UV on one rail and OV on another using a single LTC2919HMS-3.3#PBF.
Can LTC2919HMS-3.3#PBF monitor negative voltages, and how is that implemented?
Yes - the LTC2919HMS-3.3#PBF monitors negative supplies using its buffered 1.000V REF output. By referencing ADJ1 or ADJ2 to REF instead of GND, the device detects when a negative rail exceeds its absolute value threshold (e.g., –4.3V for a –5V supply). This is enabled by SEL pin configuration for negative polarity, and requires no external op-amps or level shifters - a capability confirmed in the device's "Negative Polarity Input Timing" diagram and Table 2a.
What reset timeout options are available on LTC2919HMS-3.3#PBF, and how are they selected?
The LTC2919HMS-3.3#PBF offers three reset timeout modes: internal 200ms (TMR = GND), external capacitor-based (9ms/nF, e.g., 22nF → 200ms), or disabled (TMR = VCC, entering comparator mode). The internal timeout is factory-trimmed and requires no external components - a key differentiator from alternatives like TPS3808G33DBVR, which lacks adjustable inputs and polarity control.
Is LTC2919HMS-3.3#PBF pin-compatible with other variants in the LTC2919 family?
Yes - all LTC2919 variants (e.g., LTC2919HMS-2.5#PBF, LTC2919HMS-5#PBF) share identical 10-lead MSOP pinout and electrical interface. Only the VCC UVLO threshold differs (2.175V, 2.871V, or 4.350V), while ADJ thresholds, REF, SEL, TMR, and output behavior remain functionally identical - enabling drop-in replacement across voltage grades without PCB changes.
LTC2919HMS-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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-MSOP
LTC2919HMS-3.3#PBF FAQ
1.How can I place an order for LTC2919HMS-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2919HMS-3.3#PBF 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 LTC2919HMS-3.3#PBF reliable?
The price and inventory of LTC2919HMS-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2919HMS-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC2919HMS-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2919HMS-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2919HMS-3.3#PBF?
LTC2919HMS-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2919HMS-3.3#PBF 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 LTC2919HMS-3.3#PBF?
For technical support, including LTC2919HMS-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2919HMS-3.3#PBF requirements.
6.How does Aetrix verify that LTC2919HMS-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2919HMS-3.3#PBF 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 LTC2919HMS-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC2919HMS-3.3#PBF?
All LTC2919HMS-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2919HMS-3.3#PBF, 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 LTC2919HMS-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC2919HMS-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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