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Analog Devices Inc. LTC2906CDDB#TRMPBF
- Part No.:
- LTC2906CDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2906CDDB#TRMPBF.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,123
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Product details
Overview
LTC2906CDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a precision dual supply monitor IC with one pin-selectable threshold input (5V/3.3V/2.5V) and one adjustable 0.5V input, featuring ±1.5% threshold accuracy over temperature, 200ms fixed reset delay, open-drain RST output, and guaranteed operation down to V1 ≥ 1V or VCC ≥ 1V. It is used in desktop/notebook computers and network servers for reliable power-up/power-down sequencing and brownout detection.
For engineers reviewing the LTC2906CDDB#TRMPBF datasheet, LTC2906CDDB#TRMPBF pinout, LTC2906CDDB#TRMPBF application, or LTC2906CDDB#TRMPBF equivalent, this page delivers verified specifications, DFN-8 package layout, real-world timing behavior, threshold programming logic, and direct alternatives for dual-rail monitoring in space-constrained embedded systems.
Technical Context
The LTC2906CDDB#TRMPBF integrates two independent voltage comparators - one with programmable thresholds via S1/TOL three-state inputs, and another with a fixed 0.5V reference scalable by tolerance setting - both feeding a shared 200ms reset pulse generator. Its internal VMAX logic selects the higher of V1 or VCC as the supply for RST drive circuitry, enabling robust reset assertion even during asymmetric rail ramp-up.
It employs comparator integration filtering and fixed 200ms timeout to reject supply transients and noise without sacrificing threshold accuracy; no external capacitor is required for delay timing. The device guarantees correct RST state at VMAX ≥ 1V and supports auxiliary VCC biasing to maintain reset integrity when primary rails collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Accuracy | ±1.5% of monitored voltage over full operating temperature range - ensures deterministic trip points for margin-critical systems |
| Reset Delay Time | 200ms (fixed, guaranteed 140–260ms) - eliminates need for external timing capacitor and simplifies BOM |
| V1 Input Threshold Options | 5V/3.3V/2.5V selectable via S1 pin (V1/GND/open) - enables single part to cover multiple supply rails without redesign |
| VADJ Threshold | 0.5V nominal, adjustable via external resistor divider - supports custom trip points from 0.6V to 12V with 1% resistor networks |
| Supply Tolerance Options | 5%/7.5%/10% selectable via TOL pin (V1/open/GND) - allows precise margining for production testing and reliability validation |
| RST Output Type | Open-drain with weak internal pull-up to VMAX - supports wired-OR reset buses and level-shifting without external components |
| Minimum Operating Voltage | V1 ≥ 1V or VCC ≥ 1V guarantees valid RST logic state - ensures fail-safe reset assertion during deep brownout |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN (DDB8), exposed pad (Pin 9) soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Optional auxiliary supply input | Provides backup power to RST driver when V1 drops below 1V; VMAX = max(V1, VCC) powers internal logic |
| RST (Pin 2) | Active-low reset output | Open-drain output asserted low when either V1 or VADJ falls below threshold; guaranteed active down to VMAX ≥ 1V |
| GND (Pin 4) | Ground reference | Primary return path; exposed pad (Pin 9) must be soldered to PCB ground plane for thermal stability and noise immunity |
| TOL (Pin 5) | Three-state tolerance select | Connect to V1 (5%), open (7.5%), or GND (10%) to set common tolerance for both V1 and VADJ thresholds |
| S1 (Pin 6) | Three-state V1 threshold select | Connect to V1 (5V), open (3.3V), or GND (2.5V) to program nominal V1 trip point without external resistors |
| VADJ (Pin 7) | Adjustable threshold input | Accepts divided-down voltage; internal comparator references 0.5V (scaled per TOL setting) - enables custom trip points |
| V1 (Pin 8) | Main supply input | Primary monitored rail; sets S1 logic and contributes to VMAX; bypass with ≥0.1µF capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable 5V/3.3V/2.5V threshold | Eliminates external resistor networks and reduces component count for multi-rail systems |
| 0.5V adjustable input with 5%/7.5%/10% tolerance scaling | Enables precise undervoltage detection on any rail using standard 1% resistor dividers |
| 200ms fixed reset timeout with glitch immunity | Rejects short-duration supply noise without requiring external timing components or calibration |
| Guaranteed RST operation at V1 ≥ 1V or VCC ≥ 1V | Ensures system reset remains functional during deep brownout or partial power loss |
| Internal VCC auto-select (VMAX = max(V1, VCC)) | Maintains RST drive capability even if primary rail collapses while auxiliary supply remains active |
Applications
| Desktop Computer Power Sequencing | Notebook System Brownout Detection |
|---|---|
|
Use Scenario: Monitoring 5V standby and 3.3V main rails during cold boot and sleep/wake transitions. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting synchronized reset after both supplies stabilize above threshold for 200ms. Use Value: Prevents CPU lockup due to asynchronous rail ramp-up; ±1.5% accuracy avoids false resets near nominal voltages. |
Use Scenario: Detecting undervoltage on 3.3V I/O and 1.8V core rails during battery discharge or AC adapter dropout. IC Role / Device Role / Timing Role: Adjustable VADJ input monitors scaled 1.8V rail; S1/TOL pins configure 7.5% tolerance for margin testing. Use Value: Enables graceful shutdown before data corruption; guaranteed RST at V1 ≥ 1V maintains control during deep brownout. |
| Network Server Core/I/O Monitor | Industrial Embedded Controller Supply Validation |
|
Use Scenario: Validating 12V backplane, 5V logic, and 2.5V memory rails in redundant power architectures. IC Role / Device Role / Timing Role: Uses VCC pin tied to auxiliary 5V supply to keep RST active even if main 12V fails. Use Value: Supports hot-swap capability and fault isolation; open-drain RST allows wired-OR with other supervisors. |
Use Scenario: Verifying stable 24V DC input and regulated 5V/3.3V outputs in PLC or motor drive control modules. IC Role / Device Role / Timing Role: Configured with S1=GND (2.5V) and TOL=open (7.5%) to monitor auxiliary 3.3V rail with margin. Use Value: Reduces BOM cost vs. discrete solutions; DFN-8 package fits tight board areas near power stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2907CDDB#TRMPBF | Adjustable reset delay via external TMR capacitor (vs. fixed 200ms); same pinout and threshold programming | Required where reset timing must be tuned per processor (e.g., FPGA configuration time) | Select LTC2907CDDB#TRMPBF only if variable delay is needed; otherwise LTC2906CDDB#TRMPBF reduces component count |
| TPS3808G33DBVR | Single-supply monitor (3.3V only), no adjustable VADJ input, ±2.0% threshold accuracy, 200ms fixed delay | Lacks dual-input flexibility and precision; suitable only for single-rail 3.3V systems | Use TPS3808G33DBVR only when monitoring one rail and ±2.0% accuracy suffices; LTC2906CDDB#TRMPBF provides superior flexibility and accuracy |
Compared with LTC2907CDDB#TRMPBF, LTC2906CDDB#TRMPBF eliminates timing capacitor placement and reduces design complexity; compared with TPS3808G33DBVR, it delivers dual-rail monitoring, 0.5V adjustable input, and tighter ±1.5% accuracy - critical for multi-voltage systems requiring margin validation.
Availability
LTC2906CDDB#TRMPBF is available at Aetrix Electronics and suitable for desktop computers, notebook systems, and network servers requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across temperature.
Supply support for LTC2906CDDB#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 acquired Linear Technology in 2017 and maintains its high-precision analog and power management product lines with rigorous qualification and long-term support.
The LTC2906 belongs to Linear's precision power supervision family, designed specifically for reliable dual-rail monitoring in computing, communications, and industrial systems where supply margining, brownout resilience, and space efficiency are critical.
FAQ
What is the operating temperature range for the LTC2906CDDB#TRMPBF?
The LTC2906CDDB#TRMPBF is rated for 0°C to 70°C (Commercial grade). This is confirmed by the "C" suffix in the part number and explicitly stated in the Electrical Characteristics table under Operating Temperature Range. The device meets all specifications-including ±1.5% threshold accuracy and 200ms reset delay-across this full range.
Does the LTC2906CDDB#TRMPBF require an external capacitor for reset timing?
No, the LTC2906CDDB#TRMPBF does not require an external capacitor for reset timing. It features a fixed 200ms reset delay (guaranteed 140–260ms) implemented internally. Unlike the LTC2907 variant, the LTC2906CDDB#TRMPBF has no TMR pin and uses dedicated RST logic that starts timing automatically upon power-up or fault recovery.
How is the VADJ threshold programmed on the LTC2906CDDB#TRMPBF?
The VADJ threshold on the LTC2906CDDB#TRMPBF is programmed using an external resistor divider between the supply to be monitored and ground, connected to the VADJ pin. The internal comparator references 0.5V (scaled per TOL setting), so R1/R2 values are calculated using the formula R1 = R2 × (VTRIP / 0.5) − R2. Table 2 in the datasheet provides 1% resistor values for common trip voltages.
Can the LTC2906CDDB#TRMPBF monitor a 1.2V supply?
Yes, the LTC2906CDDB#TRMPBF can monitor a 1.2V supply using the VADJ input. By configuring a resistor divider (e.g., R1 = 124kΩ, R2 = 100kΩ per Table 2), the 1.2V rail is scaled to 0.5V at VADJ. With TOL set to V1 (5% tolerance), the effective trip point becomes 1.2V ±60mV, maintaining the device's ±1.5% relative accuracy specification.
What is the function of the VCC pin on the LTC2906CDDB#TRMPBF?
The VCC pin on the LTC2906CDDB#TRMPBF serves as an optional auxiliary power input. When present, it combines with V1 to form VMAX = max(V1, VCC), which powers the RST output driver. This ensures RST remains functional even if V1 drops below 1V - provided VCC stays ≥1V - enabling robust reset assertion during asymmetric rail failures.
LTC2906CDDB#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:
- 2
- Voltage - Threshold:
- 2.5V, 3.3V, 5V, 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:
- 8-DFN (3x2)
LTC2906CDDB#TRMPBF FAQ
1.How can I place an order for LTC2906CDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2906CDDB#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 LTC2906CDDB#TRMPBF reliable?
The price and inventory of LTC2906CDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2906CDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2906CDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2906CDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2906CDDB#TRMPBF?
LTC2906CDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2906CDDB#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 LTC2906CDDB#TRMPBF?
For technical support, including LTC2906CDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2906CDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC2906CDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2906CDDB#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 LTC2906CDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2906CDDB#TRMPBF?
All LTC2906CDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2906CDDB#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 LTC2906CDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2906CDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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