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Analog Devices Inc. LTC2909CDDB-5#TRMPBF
- Part No.:
- LTC2909CDDB-5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2909CDDB-5#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,283
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Product details
Overview
LTC2909CDDB-5#TRMPBF from Analog Devices (formerly Linear Technology) is a precision triple-input supply monitor IC with dual adjustable UV/OV inputs and fixed 5V VCC UVLO. It features ±1.5% threshold accuracy, 50μA quiescent current, 6.5V internal shunt regulator, buffered 1V reference, and open-drain RST output. Used in desktop/notebook computers and network servers for core/I/O voltage supervision.
For engineers reviewing the LTC2909CDDB-5#TRMPBF datasheet, LTC2909CDDB-5#TRMPBF pinout, LTC2909CDDB-5#TRMPBF application, or LTC2909CDDB-5#TRMPBF equivalent, key selection criteria include input polarity configurability via SEL pin, 200ms internal reset timeout, 0.5V nominal ADJ threshold, VCC UVLO at 4.425V (±1.5%), and TSOT-23/DFN package compatibility.
Technical Context
The LTC2909CDDB-5#TRMPBF integrates two 0.5V-threshold comparators with pin-selectable polarity (positive UV/negative OV or negative UV/positive OV), a third fixed 5V VCC UVLO monitor (4.425V threshold), and a programmable reset timeout circuit. Its three-state SEL pin enables polarity configuration without external components.
It uses proprietary low-voltage RST drive capable of asserting logic low down to VCC = 0.5V, includes glitch filtering on ADJ inputs, and provides a buffered 1V reference (±15mV over temperature) for negative-supply offset applications. The internal 6.5V shunt regulator allows operation from supplies up to 6V directly or higher voltages with series current-limiting resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Threshold | 4.425V ±1.5% - guarantees reliable power-on reset for 5V systems before timing/monitoring activates |
| ADJ Input Threshold | 0.500V ±1.5% - precise, temperature-stable trip point for external resistor-divider configured supplies |
| Quiescent Current | 50μA typical - enables micropower system monitoring without significant battery drain |
| Shunt Regulator Voltage | 6.5V - permits direct connection to 5V rails or high-voltage operation with series resistor |
| Reset Timeout | 200ms internal - eliminates need for external timing capacitor in standard configurations |
| Reference Output | 1.000V ±15mV - buffered, loadable to ±1mA for accurate negative-supply offset generation |
| Operating Supply Range | 0.5V to 6V - ensures RST assertion during brownout down to ultralow VCC |
Pinout & Package
Package: 8-lead 3mm × 2mm DFN (DDB) with exposed pad (Pin 9). RoHS-compliant, lead-free, tape-and-reel (#TRMPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 1) | Three-state polarity select input | Determines ADJ1/ADJ2 input polarity: VCC = both positive, GND = both negative, open = mixed polarity |
| ADJ1 (Pin 2) | Adjustable voltage monitor input 1 | 0.5V threshold comparator input; polarity set by SEL; tied to REF if unused (SEL = VCC/open) |
| REF (Pin 3) | Buffered 1V reference output | Sources/sinks ±1mA; used for negative-supply offset; no bypass cap required |
| GND (Pin 4) | Device ground reference | Common return for all analog/digital functions; exposed pad may be grounded for thermal improvement |
| RST (Pin 5) | Open-drain inverted reset output | Asserts low on any fault; requires external pull-up; operates down to VCC = 0.5V |
| VCC (Pin 6) | Power supply input / shunt regulator | Accepts 0.5–6V directly; >6V requires series resistor; also serves as 5V UVLO monitor |
| TMR (Pin 7) | Reset timeout control | GND = 200ms internal timeout; VCC = comparator mode (no timeout); capacitor to GND = programmable delay |
| ADJ2 (Pin 8) | Adjustable voltage monitor input 2 | 0.5V threshold comparator input; polarity set by SEL; tied to GND if unused (SEL = GND/open) |
Key Features
| Feature | Design Value |
|---|---|
| Polarity-selectable inputs | SEL pin configures ADJ1/ADJ2 as positive UV/negative OV, negative UV/positive OV, or mixed - enables single IC to monitor diverse supply types |
| Ultralow-voltage reset | Guaranteed RST assertion down to VCC = 0.5V - prevents undefined system state during deep brownout |
| Glitch-filtered comparators | Integrated low-pass filtering rejects short transients (<10μs) without sacrificing threshold accuracy |
| Internal 200ms timeout | No external capacitor needed - reduces BOM count and layout area in standard 5V monitoring applications |
| 6.5V shunt regulator | Enables direct use with 5V rails while supporting >6V supplies via simple series resistor - simplifies high-voltage design |
Applications
| Desktop Computer Core Voltage Monitoring | Notebook Computer I/O Rail Supervision |
|---|---|
Use Scenario: Monitoring 1.2V CPU core and 3.3V PCIe I/O rails in x86-based desktop motherboards. IC Role / Device Role / Timing Role: LTC2909CDDB-5#TRMPBF acts as dual-rail supervisor with ADJ1 monitoring core (via resistor divider), ADJ2 monitoring I/O, and VCC UVLO validating 5V standby rail. Use Value: ±1.5% threshold accuracy prevents nuisance resets within 1.2V ±5% and 3.3V ±5% tolerance bands; 200ms timeout ensures stable boot after power sequencing. | Use Scenario: Supervising 5V USB-C PD interface and –12V display backlight in thin-and-light notebooks. IC Role / Device Role / Timing Role: LTC2909CDDB-5#TRMPBF monitors +5V (ADJ1, SEL=VCC) and –12V (ADJ2, SEL=GND) using REF as offset; VCC UVLO checks 5V main rail. Use Value: Buffered 1V REF enables accurate negative-supply monitoring without external op-amps; 50μA ICC extends battery life during sleep states. |
| Network Server 12V/–48V Telecom Supply Monitoring | Automotive Infotainment Power Sequencing |
Use Scenario: Validating primary 12V DC-DC output and backup –48V telecom line in rack-mounted servers. IC Role / Device Role / Timing Role: LTC2909CDDB-5#TRMPBF uses ADJ1 for 12V UV/OV (SEL=open), ADJ2 for –48V UV (SEL=GND), and VCC UVLO for 5V management controller rail. Use Value: Mixed-polarity capability (SEL=open) allows simultaneous positive OV and negative UV detection on one IC; 6.5V shunt regulator supports direct 12V input with series resistor. | Use Scenario: Coordinating startup of 3.3V MCU, 5V display, and –5V audio amplifier in automotive head units. IC Role / Device Role / Timing Role: LTC2909CDDB-5#TRMPBF supervises 3.3V (ADJ1), 5V (VCC UVLO), and –5V (ADJ2) with SEL=GND; RST holds MCU in reset until all rails stabilize. Use Value: Guaranteed 0.5V RST operation ensures reset assertion during cold-cranking (battery dip to 6V); ±1.5% accuracy meets AEC-Q100 functional safety 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 fixed UVLO; no adjustable inputs or polarity selection; 2.5μA IQ; SOT-23-6 | Only monitors VCC; cannot supervise dual/mixed-polarity supplies or generate buffered reference | Choose for low-cost, single-rail 3.3V systems where ADJ inputs and REF are unnecessary |
| MAX6816EUT+T | Dual 0.6V adjustable inputs; ±2% threshold accuracy; no VCC UVLO; no buffered REF; SOT-23-6 | Lacks 5V-specific VCC monitoring and 1V reference; lower accuracy increases risk of nuisance reset in tight-tolerance systems | Choose when only dual-adjustable monitoring is needed and ±2% accuracy suffices for 5V rail margin |
Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2909CDDB-5#TRMPBF uniquely combines triple monitoring (dual ADJ + VCC UVLO), pin-selectable polarity, buffered 1V reference, and ultralow 0.5V reset operation - making it the only option for space-constrained, multi-rail, mixed-polarity systems requiring high accuracy and extended voltage range.
Availability
LTC2909CDDB-5#TRMPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across temperature.
Supply support for LTC2909CDDB-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2909 product line delivers precision, low-power, multi-rail voltage supervision for computing and infrastructure systems where reliability, accuracy, and compact packaging are critical - especially in environments with mixed positive/negative supplies and stringent brownout immunity requirements.
FAQ
What is the VCC UVLO threshold for LTC2909CDDB-5#TRMPBF?
The LTC2909CDDB-5#TRMPBF has a fixed VCC undervoltage lockout threshold of 4.425V ±1.5%, specifically calibrated for 5V system monitoring. This value is guaranteed over the full 0°C to 70°C operating temperature range and triggers RST assertion when VCC falls below this level, ensuring reliable power-on reset behavior in 5V applications.
How does the SEL pin configure input polarity on LTC2909CDDB-5#TRMPBF?
The SEL pin on LTC2909CDDB-5#TRMPBF selects ADJ1/ADJ2 polarity: connected to VCC sets both inputs for positive UV/negative OV detection; connected to GND sets both for negative UV/positive OV; left open enables mixed polarity (ADJ1 positive, ADJ2 negative). Leakage current must stay below ±10μA in open state to maintain correct decoding.
Can LTC2909CDDB-5#TRMPBF monitor a negative supply without external op-amps?
Yes. LTC2909CDDB-5#TRMPBF monitors negative supplies directly using its buffered 1V REF output as an offset. For example, to monitor –5V UV, connect ADJ2 to a resistor divider between –5V and REF, configure SEL=GND, and set thresholds accordingly - eliminating need for external amplifiers or level-shifters.
What is the minimum VCC voltage that guarantees RST assertion for LTC2909CDDB-5#TRMPBF?
LTC2909CDDB-5#TRMPBF guarantees RST assertion down to VCC = 0.5V, with VOL(RST) ≤ 0.15V at VCC = 3V and IRST = 2500μA. This ultralow-voltage capability ensures deterministic reset behavior during severe brownout conditions common in automotive and battery-powered systems.
Does LTC2909CDDB-5#TRMPBF require an external timing capacitor for basic operation?
No. LTC2909CDDB-5#TRMPBF includes a selectable 200ms internal reset timeout. By tying the TMR pin to GND, users enable this factory-calibrated delay without any external capacitor - reducing component count and PCB area in standard 5V monitoring applications.
LTC2909CDDB-5#TRMPBF 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 4.425V, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2909CDDB-5#TRMPBF FAQ
1.How can I place an order for LTC2909CDDB-5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2909CDDB-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 LTC2909CDDB-5#TRMPBF reliable?
The price and inventory of LTC2909CDDB-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 LTC2909CDDB-5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2909CDDB-5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2909CDDB-5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2909CDDB-5#TRMPBF?
LTC2909CDDB-5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2909CDDB-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 LTC2909CDDB-5#TRMPBF?
For technical support, including LTC2909CDDB-5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2909CDDB-5#TRMPBF requirements.
6.How does Aetrix verify that LTC2909CDDB-5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2909CDDB-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 LTC2909CDDB-5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2909CDDB-5#TRMPBF?
All LTC2909CDDB-5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2909CDDB-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 LTC2909CDDB-5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2909CDDB-5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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