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Analog Devices Inc. LTC2907CDDB#TRPBF
- Part No.:
- LTC2907CDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2907CDDB#TRPBF.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,597
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Product details
Overview
LTC2907CDDB#TRPBF 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, 5%/7.5%/10% selectable supply tolerance, and an externally programmable reset delay via capacitor on the TMR pin. It delivers reliable power-on reset, brownout detection, and glitch immunity in space-constrained embedded systems such as notebook power rails and core I/O monitoring.
For engineers reviewing the LTC2907CDDB#TRPBF datasheet, LTC2907CDDB#TRPBF pinout, LTC2907CDDB#TRPBF application, or LTC2907CDDB#TRPBF equivalent, this page provides verified technical context, package-validated pin functions, real-world timing behavior, confirmed alternative options for dual-supply supervision, and supply-chain support details specific to the DDB8 (3mm × 2mm DFN) variant.
Technical Context
The LTC2907CDDB#TRPBF implements two independent voltage comparators-one with a resistor-divider-programmable VADJ input referenced to a 0.5V internal bandgap, and another with a three-state S1-configurable V1 input (5V/3.3V/2.5V nominal). Both share a common open-drain RST output and use the same internal VMAX supply derived from max(V1, VCC).
Its reset assertion logic requires both monitored inputs to remain above their respective thresholds for the full TMR-capacitor-programmed delay before releasing RST; transient noise rejection is achieved via comparator output integration and the programmable timeout-eliminating hysteresis-induced threshold error while maintaining ±1.5% accuracy across –40°C to 85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Accuracy | ±1.5% of programmed nominal voltage (e.g., ±75 mV at 5V) over full operating temperature range - enables tight margining without derating. |
| VADJ Input Threshold | 0.465 V to 0.508 V at 10% tolerance - supports precise undervoltage detection down to 0.5V with external resistor divider. |
| V1 Input Threshold Options | 2.175–2.375 V (2.5V), 2.871–3.135 V (3.3V), or 4.350–4.750 V (5V) - selectable via S1 pin connection without external components. |
| Reset Delay Range | ~200 µs (TMR pin open) to >10 s (with large CTMR) - set by external capacitor (9 ms/nF scaling); 22 nF yields 200 ms typical. |
| Supply Voltage Range | V1/VCC = –0.3 V to 7 V; guaranteed RST operation down to V1 ≥ 1 V or VCC ≥ 1 V - ensures robust reset assertion during brownout. |
| Quiescent Current | 54–100 µA (IVCC), 1–3 µA (IV1), ±15 nA (IVADJ) - enables micropower system monitoring without load impact. |
| Package | 8-lead DFN (3 mm × 2 mm, 0.75 mm height) with exposed thermal pad - optimized for high-density PCB layouts and thermal performance. |
Pinout & Package
Package: 8-lead plastic DFN (3 mm × 2 mm), 0.75 mm profile, exposed pad (Pin 9) soldered to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Optional auxiliary supply input | Provides backup power path; internal VMAX = max(V1, VCC); bypass with ≥0.1 µF capacitor. |
| TMR (Pin 2) | Reset delay timing capacitor connection | Capacitor to GND sets tRST = 9 ms/nF; open = ~200 µs minimum delay; drives internal current source. |
| RST (Pin 3) | Open-drain reset output | Pulls low when either V1 or VADJ falls below threshold; weak internal pull-up to VMAX; supports wired-OR. |
| GND (Pin 4) | Ground reference and thermal pad anchor | Primary return path; exposed pad (Pin 9) must be soldered to PCB ground plane for thermal stability. |
| TOL (Pin 5) | Three-state tolerance selection input | Connect to V1/GND/open to select 5%/10%/7.5% supply tolerance for both V1 and VADJ thresholds. |
| S1 (Pin 6) | Three-state V1 threshold selection input | Connect to V1/GND/open to configure V1 nominal threshold as 5V/2.5V/3.3V per Table 1. |
| VADJ (Pin 7) | Adjustable voltage monitor input | Compares against 0.5V internal reference; bypass with ≥0.1 µF capacitor; connects to resistor divider tap. |
| V1 (Pin 8) | Primary supply voltage input | Monitored rail (5V/3.3V/2.5V); also serves as reference for S1/TOL programming; bypass with ≥0.1 µF capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable V1 threshold | Eliminates external resistors: 5V/3.3V/2.5V configured via S1 pin state (V1/GND/open), reducing BOM count and layout area. |
| Adjustable 0.5V VADJ input | Enables custom trip points from 0.6V to 12V using standard 1% resistors (e.g., 49.9kΩ + 100kΩ for 0.8V at 10% tolerance). |
| Programmable reset delay | Supports microprocessor-specific timing requirements (e.g., 200 ms for x86 BIOS) via single external capacitor-no firmware or additional logic needed. |
| Guaranteed operation down to 1V | Ensures valid RST assertion even during deep brownout: functional reset output with V1 ≥ 1 V or VCC ≥ 1 V. |
| Glitch-immune comparator architecture | Integrates comparator output before triggering RST, rejecting transients <150 µs duration without sacrificing ±1.5% threshold accuracy. |
Applications
| Desktop Power Sequencing | Notebook Core/I/O Monitoring |
|---|---|
Use Scenario: Coordinating startup of CPU core (1.2V), GPU (1.0V), and DDR memory (1.5V) rails with precise sequencing and fault detection. IC Role / Device Role / Timing Role: Dual-supply monitor asserting RST until both VADJ (core rail) and V1 (I/O rail) exceed thresholds for programmable delay. Use Value: Prevents premature processor execution by guaranteeing stable core and I/O supplies before release-enabling compliance with Intel VRD specs. | Use Scenario: Monitoring 3.3V system rail and 1.8V SoC I/O rail in ultra-thin notebooks where board space limits discrete supervision solutions. IC Role / Device Role / Timing Role: LTC2907CDDB#TRPBF acts as compact dual-rail supervisor with DFN package footprint (3 mm × 2 mm) and no external timing components beyond CTMR. Use Value: Reduces solution size by >40% vs. dual discrete supervisors; eliminates need for separate reset delay IC or RC network. |
| Industrial PLC Power Good | Network Server Baseboard Management |
Use Scenario: Validating 24V DC input and 5V logic rail in programmable logic controllers subject to EMI and voltage sags in factory environments. IC Role / Device Role / Timing Role: LTC2907CDDB#TRPBF monitors V1 (24V via resistor divider) and VADJ (5V) with 10% tolerance to tolerate line fluctuations without false resets. Use Value: ±1.5% threshold accuracy and integrated noise filtering prevent nuisance shutdowns during motor switching transients. | Use Scenario: Providing redundant power-good signaling for dual 12V/3.3V server backplanes with hot-swap capability and BMC interface. IC Role / Device Role / Timing Role: LTC2907CDDB#TRPBF generates synchronized RST pulse after both rails stabilize, feeding into baseboard management controller GPIO. Use Value: Programmable tRST (via CTMR) aligns reset timing with BMC firmware boot sequence-avoiding race conditions during cold start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single 3.3V fixed threshold; no adjustable VADJ input; fixed 200ms delay; SOT-23-6 package | Only monitors one rail; lacks dual-input flexibility and resistor-divider programmability | Select when only 3.3V rail supervision is required and board space permits SOT-23-6. |
| MAX6816EUT+T | Dual 5V/3.3V fixed thresholds; no VADJ input; fixed 200ms delay; ±2.5% threshold accuracy; SOT-23-6 | Lower accuracy; no tolerance selection; no auxiliary VCC pin; less noise immunity | Choose for cost-sensitive designs where ±2.5% accuracy suffices and dual fixed rails match system needs. |
Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2907CDDB#TRPBF uniquely supports dual-rail monitoring with one programmable threshold (VADJ), selectable V1 levels, 5%/7.5%/10% tolerance tuning, and capacitor-adjustable delay-all in a space-saving DFN package with superior ±1.5% accuracy and guaranteed 1V operation.
Availability
LTC2907CDDB#TRPBF is available at Aetrix Electronics and suitable for desktop power sequencing, notebook core/I/O monitoring, and industrial PLC power-good applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2907CDDB#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2907CDDB#TRPBF belongs to Linear's precision power supervision product line, designed specifically for high-reliability embedded systems requiring accurate, low-power, multi-rail voltage monitoring with minimal external components.
FAQ
What is the operating temperature range for the LTC2907CDDB#TRPBF?
The LTC2907CDDB#TRPBF is rated for 0°C to 70°C ambient operation (Commercial grade). Its electrical specifications-including ±1.5% threshold accuracy and reset timing-are guaranteed across this full range. For extended temperature applications (–40°C to 85°C), the LTC2907IDDB variant is specified.
How do I configure the LTC2907CDDB#TRPBF to monitor a 2.5V rail and a 0.8V rail?
To monitor 2.5V and 0.8V rails with the LTC2907CDDB#TRPBF, connect V1 to the 2.5V rail and set S1 = GND (per Table 1). For the 0.8V rail, connect it to VADJ via a resistor divider: use R1 = 49.9kΩ and R2 = 100kΩ (from Table 2) to achieve 0.8V trip at 10% tolerance. Set TOL = GND for 10% mode.
Does the LTC2907CDDB#TRPBF require external pull-up resistors on the RST pin?
The LTC2907CDDB#TRPBF features an internal weak pull-up to VMAX (~6 µA), sufficient for most applications. However, if fast rise time (>10 µs), higher VOH (>VMAX), or wired-OR configurations are needed, an external pull-up (e.g., 10 kΩ to VMAX) is recommended. The internal pull-up remains active but is overridden by the stronger external resistor.
Can the LTC2907CDDB#TRPBF monitor voltages above 7V?
No-the absolute maximum rating for V1 and VCC is 7V. To monitor higher rails (e.g., 12V), use a resistor divider to scale the voltage down to ≤7V at the V1 or VADJ pin. For example, a 2150kΩ/100kΩ divider reduces 12V to 0.55V at VADJ, enabling precise 11.25V trip detection per Table 2.
What is the minimum capacitor value needed to achieve a 200ms reset delay with the LTC2907CDDB#TRPBF?
A 22 nF capacitor on the TMR pin yields a nominal 200 ms reset delay (tRST = 9 ms/nF × 22 nF). This value is confirmed in the datasheet's Typical Application Circuit (Figure 2907 TA04) and Electrical Characteristics table. Standard film or ceramic capacitors with ≤10% tolerance are recommended for timing stability.
LTC2907CDDB#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:
- 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)
LTC2907CDDB#TRPBF FAQ
1.How can I place an order for LTC2907CDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2907CDDB#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 LTC2907CDDB#TRPBF reliable?
The price and inventory of LTC2907CDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2907CDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2907CDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2907CDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2907CDDB#TRPBF?
LTC2907CDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2907CDDB#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 LTC2907CDDB#TRPBF?
For technical support, including LTC2907CDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2907CDDB#TRPBF requirements.
6.How does Aetrix verify that LTC2907CDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2907CDDB#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 LTC2907CDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2907CDDB#TRPBF?
All LTC2907CDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2907CDDB#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 LTC2907CDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC2907CDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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