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Analog Devices Inc. LTC2909IDDB-2.5#TRPBF
- Part No.:
- LTC2909IDDB-2.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2909IDDB-2.5#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,885
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Product details
Overview
LTC2909IDDB-2.5#TRPBF from Analog Devices (acquired Linear Technology) is a precision dual adjustable-input undervoltage/overvoltage monitor with fixed 2.5V VCC UVLO, ±1.5% threshold accuracy, 50μA quiescent current, and 8-lead DFN (3mm × 2mm) package. It monitors two independent supplies-positive or negative polarity selectable via SEL pin-and asserts open-drain RST during fault conditions in desktop computers, network servers, and automotive power systems.
For engineers reviewing the LTC2909IDDB-2.5#TRPBF datasheet, LTC2909IDDB-2.5#TRPBF pinout, LTC2909IDDB-2.5#TRPBF application, or LTC2909IDDB-2.5#TRPBF equivalent, key selection considerations include input polarity configuration (SEL pin states), reset timeout mode (internal 200ms vs. external capacitor vs. comparator bypass), buffered 1V reference for negative-supply offset, and guaranteed 0.5V ADJ threshold accuracy over –40°C to +85°C.
Technical Context
The LTC2909IDDB-2.5#TRPBF implements dual 0.5V-comparator inputs with polarity decoding via three-state SEL pin (VCC/GND/open), enabling simultaneous positive-UV/negative-OV or mixed-polarity monitoring without external components. Its internal 6.5V shunt regulator allows operation from supplies up to 6V directly or higher voltages with series current-limiting resistor.
Reset logic combines glitch-filtered comparator outputs with programmable timeout (200ms internal, 16–25ms external with 2.2nF, or disabled in comparator mode). The buffered 1V reference (±15mV accuracy, ±1mA drive) supports precise negative-voltage offset generation, while ultralow VCC UVLO (2.213V nominal, ±1.5%) guarantees functional integrity down to VCC = 0.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Threshold | 2.213V (nominal), ±1.5% accuracy ensures reliable system startup at 2.5V logic supply |
| ADJ Input Threshold | 0.500V ±0.0075V (±1.5%), tight tolerance enables precise supply margining for 5% or tighter rails |
| Quiescent Current | 50μA typical, enables battery-backed or always-on monitoring in handheld and automotive systems |
| Reference Output | 1.000V ±0.015V, buffered source/sink ±1mA supports direct connection to resistor dividers for negative-supply monitoring |
| Reset Timeout | 200ms internal (TMR = GND), 20ms typical with 2.2nF (TMR to GND), or disabled (TMR = VCC) for comparator-mode response |
| Operating Temp Range | –40°C to +85°C (I-grade), qualified for industrial and automotive under-hood environments |
| Package | 8-lead DFN (3mm × 2mm, exposed pad), space-constrained PCBs requiring thermal performance (θJA = 76°C/W) |
Pinout & Package
8-lead plastic DFN package (3mm × 2mm) with exposed thermal pad (Pin 9, optional GND connection). Pinout conforms to DDB variant: Pin 1 = SEL, Pin 2 = TMR, Pin 3 = VCC, Pin 4 = RST, Pin 5 = ADJ1, Pin 6 = ADJ2, Pin 7 = REF, Pin 8 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL | Three-state polarity select input | Determines ADJ1/ADJ2 polarity: VCC = both positive, GND = both negative, open = mixed (ADJ1+, ADJ2–) |
| TMR | Reset timeout control | GND = 200ms internal timeout; capacitor to GND = programmable timeout; VCC = comparator mode (no timeout) |
| VCC | Power supply input | Operates 0.5V–6V directly; >6V requires series resistor due to integrated 6.5V shunt regulator |
| RST | Open-drain inverted reset output | Asserts low on any fault (UV/OV on ADJ1/ADJ2 or VCC UVLO); requires external pull-up; sinks 2.5mA at VCC = 3V |
| ADJ1 / ADJ2 | Adjustable voltage monitor inputs | 0.5V threshold comparators; polarity set by SEL; ±15nA input bias enables high-impedance divider networks |
| REF | Buffered 1V reference output | Stable 1.000V ±15mV reference for generating negative-supply offset voltages; drives 1000pF capacitive load |
| GND | Analog ground reference | Common return for all analog circuitry; exposed pad improves thermal dissipation when tied to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Polarity-selectable dual monitoring | Single SEL pin configures ADJ1/ADJ2 for positive-UV, negative-OV, or mixed polarity-eliminates need for external logic or multiple supervisors |
| Guaranteed low-VCC operation | Resets reliably down to VCC = 0.5V, ensuring robust power-up sequencing in brownout conditions |
| Glitch-immune comparator design | Integrated low-pass filtering rejects transients <500μs duration, preventing false resets from load-switch noise or ESD |
| Space-optimized DFN packaging | 3mm × 2mm footprint saves >40% board area vs. TSOT-23; exposed pad enables thermal management in high-density layouts |
| Accurate fixed UVLO on VCC | 2.213V ±1.5% threshold for 2.5V systems eliminates need for external resistor divider on main supply rail |
Applications
| Desktop Power Sequencing | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring core (1.2V) and I/O (3.3V) rails during cold-start and transient load switching in ATX-compliant motherboards. IC Role / Device Role / Timing Role: Dual-input supervisor asserting RST until both rails stabilize above thresholds, with 200ms internal timeout ensuring clean boot after power-on. Use Value: Prevents CPU lockup by guaranteeing stable core/I/O voltage before release; ±1.5% accuracy avoids nuisance resets within 5% rail tolerances. | Use Scenario: Supervising 12V battery-derived 5V microcontroller supply and isolated –5V sensor bias rail in vehicle door module. IC Role / Device Role / Timing Role: ADJ1 monitors +5V for UV (SEL = VCC), ADJ2 monitors –5V for OV (SEL = GND), REF provides offset for negative rail sensing. Use Value: Single IC replaces two discrete supervisors; buffered 1V REF enables accurate –5V OV detection without additional op-amps or references. |
| Network Server VRM Monitoring | Industrial Handheld Battery Management |
Use Scenario: Validating 1.8V FPGA core and 12V auxiliary rails in 1U rack server, where rapid fault detection prevents thermal runaway. IC Role / Device Role / Timing Role: ADJ1 (1.8V UV) and ADJ2 (12V OV) configured with open SEL for mixed polarity; TMR capacitor sets 16ms timeout for fast fault response. Use Value: 50μA quiescent current minimizes standby drain; 0.5V ADJ threshold accuracy ensures detection of 3% droop on 1.8V rail (±1.5% × 1.8V = ±27mV margin). | Use Scenario: Monitoring Li-ion battery pack voltage (3.0–4.2V) and regulated 3.3V system rail in portable medical scanner with battery backup. IC Role / Device Role / Timing Role: ADJ1 monitors battery UV (SEL = VCC), VCC UVLO (2.213V) guards against brownout during discharge; RST holds MCU in reset below safe operating voltage. Use Value: Guaranteed 0.5V operation allows RST assertion even as battery drops to 2.8V, extending usable runtime while protecting flash memory writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2909CDDB-2.5#TRPBF | Same functionality and pinout, but commercial temperature range (0°C to 70°C) vs. industrial (–40°C to 85°C) | Suitable for non-automotive, non-industrial indoor applications with controlled ambient | Select for cost-sensitive consumer electronics where extended temperature qualification is unnecessary |
| TPS3808G33DBVR | Single 3.3V UVLO with 200ms timeout only; no dual adjustable inputs, no polarity selection, no REF output | Only monitors VCC rail; cannot replace dual-rail or negative-supply monitoring functions of LTC2909IDDB-2.5#TRPBF | Use only when supervising one fixed-voltage rail and board space permits separate solutions for secondary supplies |
Compared with LTC2909CDDB-2.5#TRPBF, the LTC2909IDDB-2.5#TRPBF adds industrial temperature reliability without changing footprint or interface; versus TPS3808G33DBVR, it delivers full dual-rail flexibility and negative-supply support at the cost of higher complexity and BOM count.
Availability
LTC2909IDDB-2.5#TRPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2909IDDB-2.5#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to expand precision power management portfolio.
The LTC2909 product line delivers highly accurate, low-power supply monitoring ICs optimized for multi-rail systems in computing, communications, and automotive applications where reliability, small size, and guaranteed parametric performance are critical.
FAQ
What is the guaranteed minimum operating voltage for LTC2909IDDB-2.5#TRPBF?
The LTC2909IDDB-2.5#TRPBF guarantees functional operation down to VCC = 0.5V, including valid RST output assertion and 0.5V ADJ threshold accuracy. This enables reliable reset generation during deep brownout conditions where other supervisors fail, making it suitable for battery-backed systems and automotive start-stop applications.
How does the SEL pin configure input polarity on LTC2909IDDB-2.5#TRPBF?
The SEL pin on LTC2909IDDB-2.5#TRPBF selects polarity for both ADJ1 and ADJ2: tied to VCC enables positive-UV monitoring on both inputs; tied to GND enables negative-OV monitoring on both; left open enables mixed polarity (ADJ1 positive-UV, ADJ2 negative-OV). Leakage current must remain below ±10μA in open state to ensure correct decoding.
Can LTC2909IDDB-2.5#TRPBF monitor a single supply for both undervoltage and overvoltage?
Yes, LTC2909IDDB-2.5#TRPBF can monitor one supply for UV and OV using three external resistors and the REF pin. For a positive supply like 5V, connect ADJ1 to a divider for UV detection and ADJ2 to another divider referenced to REF for OV detection-enabling window monitoring without additional ICs.
What is the purpose of the buffered 1V reference (REF) on LTC2909IDDB-2.5#TRPBF?
The buffered 1V reference (REF) on LTC2909IDDB-2.5#TRPBF provides a stable, low-impedance 1.000V ±15mV output capable of sourcing/sinking ±1mA. It enables accurate negative-supply monitoring by serving as the upper rail for ADJ2 resistor dividers, eliminating need for external references or op-amps in dual-polarity applications.
Does LTC2909IDDB-2.5#TRPBF require an external capacitor on the TMR pin?
No, LTC2909IDDB-2.5#TRPBF does not require an external capacitor on the TMR pin. Tying TMR to GND enables the internal 200ms timeout; leaving TMR open yields ~400μs minimum timeout; connecting TMR to VCC disables timeout entirely (comparator mode). An external capacitor is optional for custom timeout durations between 400μs and 10 seconds.
LTC2909IDDB-2.5#TRPBF 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:
- 2.213V, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2909IDDB-2.5#TRPBF FAQ
1.How can I place an order for LTC2909IDDB-2.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2909IDDB-2.5#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 LTC2909IDDB-2.5#TRPBF reliable?
The price and inventory of LTC2909IDDB-2.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2909IDDB-2.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2909IDDB-2.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2909IDDB-2.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2909IDDB-2.5#TRPBF?
LTC2909IDDB-2.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2909IDDB-2.5#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 LTC2909IDDB-2.5#TRPBF?
For technical support, including LTC2909IDDB-2.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2909IDDB-2.5#TRPBF requirements.
6.How does Aetrix verify that LTC2909IDDB-2.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2909IDDB-2.5#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 LTC2909IDDB-2.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2909IDDB-2.5#TRPBF?
All LTC2909IDDB-2.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2909IDDB-2.5#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 LTC2909IDDB-2.5#TRPBF part is unused and in its original packaging.
Return procedure for LTC2909IDDB-2.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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