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Analog Devices Inc. LTC2905HDDB#TRMPBF
- Part No.:
- LTC2905HDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2905HDDB#TRMPBF.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:171
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Product details
Overview
LTC2905HDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a precision dual supply voltage monitor IC with adjustable reset timeout, ±1.5% threshold accuracy over –40°C to 125°C, open-drain RST output, and programmable thresholds for V1 (5V/3.3V/2.5V) and V2 (3.3V/2.5V/1.8V/1.5V/1.2V/1.0V) inputs. It delivers reliable power-on reset and brownout detection in space-constrained industrial control and automotive subsystems.
For engineers reviewing the LTC2905HDDB#TRMPBF datasheet, LTC2905HDDB#TRMPBF pinout, LTC2905HDDB#TRMPBF application, or LTC2905HDDB#TRMPBF equivalent, key selection criteria include its –40°C to 125°C operating range, DFN-8 (3mm × 2mm) package with exposed GND pad, TMR pin-based reset delay tuning (e.g., 200ms with 22nF), and guaranteed RST functionality down to V1 ≥ 1V or V2 ≥ 1V.
Technical Context
The LTC2905HDDB#TRMPBF implements a dual-input comparator architecture with internal bandgap reference and three-state programming pins (S1, S2, TOL) enabling 27 unique voltage/tolerance combinations. Its reset pulse generator uses an external capacitor on the TMR pin to set timeout - 9 ms/nF scaling with 22nF yielding 200ms - and features glitch immunity via integrated low-pass filtering at comparator outputs.
It employs internal VCC auto-select (VCC = max(V1,V2)), supports open-drain RST output with weak internal pull-up (~6 µA) and strong pull-down (<40 Ω), and guarantees correct logic state for RST when V1 ≥ 1V or V2 ≥ 1V. Threshold accuracy remains ±1.5% across full temperature range without hysteresis-induced error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive and high-temp industrial environments |
| Threshold Accuracy | ±1.5% of nominal V1/V2 - enables tight margining without hysteresis penalty |
| Reset Timeout | Adjustable via CTMR (9 ms/nF); 200ms typical with 22nF - supports diverse MCU boot timing requirements |
| V1 Input Range | 5V / 3.3V / 2.5V selectable - covers core logic, I/O, and analog supply rails |
| V2 Input Range | 3.3V / 2.5V / 1.8V / 1.5V / 1.2V / 1.0V selectable - supports low-voltage processors and peripherals |
| RST Output Type | Open-drain with guaranteed VOL ≤ 0.4V @ 2.5mA - enables wired-OR reset bus and level-shifting |
| Supply Immunity | Operates with V1 ≥ 1V or V2 ≥ 1V - ensures valid reset assertion during deep brownout |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed thermal pad (Pin 9 = GND, must be soldered to PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V2 (Pin 1) | Voltage Input 2 | Monitors secondary supply (3.3V/2.5V/1.8V/1.5V/1.2V/1.0V); also contributes to internal VCC |
| TMR (Pin 2) | Reset Delay Timing Input | Connects to GND via capacitor (CTMR) to set tRST = 9 ms/nF; open = ~200μs min delay |
| RST (Pin 3) | Inverted Reset Output | Open-drain active-low output; asserts low when any input falls below threshold, held for tRST |
| GND (Pin 4) | Ground Reference | Primary ground connection; exposed pad (Pin 9) is electrically and thermally connected to GND |
| TOL (Pin 5) | Tolerance Select Input | Three-state pin: V1 = 5%, open = 7.5%, GND = 10% - sets common tolerance for both V1 and V2 |
| S1 (Pin 6) | Voltage Threshold Select | Three-state pin defining V1/V2 pair per Table 1 (e.g., V1=3.3V, V2=1.2V → S1=Open, S2=Open) |
| S2 (Pin 7) | Voltage Threshold Select | Second three-state pin completing V1/V2 combination selection with S1 and TOL |
| V1 (Pin 8) | Voltage Input 1 | Monitors primary supply (5V/3.3V/2.5V); also contributes to internal VCC = max(V1,V2) |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable thresholds | 27 combinations via S1/S2/TOL - eliminates BOM proliferation across voltage variants |
| Adjustable reset timeout | Capacitor-programmable tRST (9 ms/nF) - replaces fixed-delay parts and enables design reuse |
| Glitch-immune comparators | Integrated low-pass filtering + tRST delay - prevents false resets from sub-100µs supply transients |
| Wide supply operability | Valid RST output with V1 ≥ 1V or V2 ≥ 1V - ensures reset integrity during severe brownout |
| High-accuracy threshold | ±1.5% over –40°C to +125°C - enables tighter system voltage margins vs. ±2.5% alternatives |
Applications
| Industrial PLC Power Sequencing | Automotive ADAS Camera Module |
|---|---|
Use Scenario: Monitoring 5V system rail and 1.2V image sensor core supply in a programmable logic controller with strict startup sequencing. IC Role / Device Role / Timing Role: Dual-supply monitor asserting synchronized reset after both rails stabilize for ≥200ms, preventing firmware lockup during cold start. Use Value: Eliminates need for discrete RC timers and dual comparators; ±1.5% accuracy allows 5V rail to drop to 4.35V before reset - extending usable voltage window by 100mV vs. ±2.5% parts. | Use Scenario: Ensuring clean power-up of 3.3V ISP and 1.8V image sensor in a rear-view camera module operating under vehicle battery fluctuations. IC Role / Device Role / Timing Role: Simultaneously monitors two critical supplies and asserts RST until both exceed thresholds for user-defined delay (e.g., 200ms), blocking processor boot until stable. Use Value: Guaranteed operation down to V1 ≥ 1V or V2 ≥ 1V ensures reset validity even during cranking (battery dip to 6V); DFN-8 footprint saves board space in compact camera housing. |
| Network Switch ASIC Power Management | Medical Infusion Pump Controller |
Use Scenario: Supervising 3.3V I/O and 2.5V core supplies for a multi-gigabit Ethernet switch ASIC requiring precise power-good signaling. IC Role / Device Role / Timing Role: Provides single RST output reflecting status of both rails, with 7.5% tolerance selected to accommodate load regulation drift. Use Value: Three-state programming (S1/GND, S2/V1, TOL/Open) configures exact 3.3V/2.5V pair without external resistors - reducing component count and layout complexity. | Use Scenario: Monitoring 5V main power and 3.3V microcontroller supply in a battery-powered infusion pump where reliability and long-term stability are safety-critical. IC Role / Device Role / Timing Role: Precision dual-supply monitor with –40°C to +125°C rating ensuring reset validity across storage, transport, and clinical use temperatures. Use Value: ±1.5% threshold accuracy over full temp range avoids false resets caused by temperature-induced drift - meeting IEC 60601-1 reliability requirements without derating. |
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 | Fixed 3.3V/3.3V dual monitor; no V1/V2 voltage flexibility; 200ms fixed delay; ±2.0% threshold accuracy | Only supports identical dual-rail monitoring; lacks programmable thresholds for asymmetric supplies like 5V/1.2V | Select when only matched 3.3V rails require supervision and cost is prioritized over configurability |
| MAX6816EUT+T | Single-supply monitor with watchdog; no dual-input capability; 1.6V to 5.5V input; ±1.5% accuracy; 200ms fixed delay | Cannot monitor two independent supplies simultaneously; requires external logic for dual-rail AND condition | Select for single-rail systems needing watchdog functionality; not suitable as direct replacement for dual-monitoring role |
Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2905HDDB#TRMPBF uniquely supports asymmetric dual-rail monitoring (e.g., 5V/1.2V) with 27 programmable combinations, adjustable delay, and guaranteed operation down to 1V - making it the only option for high-reliability, thermally demanding, or mixed-voltage applications.
Availability
LTC2905HDDB#TRMPBF is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2905HDDB#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, formed through the acquisition of Linear Technology in 2017.
The LTC2905HDDB#TRMPBF belongs to ADI's precision power monitoring product line, designed specifically for high-accuracy, multi-rail supervision in harsh thermal environments including automotive, industrial, and aerospace systems.
FAQ
What is the maximum operating temperature for the LTC2905HDDB#TRMPBF?
The LTC2905HDDB#TRMPBF is rated for operation from –40°C to +125°C, making it suitable for under-hood automotive applications and high-temperature industrial environments. This H-grade qualification is explicitly defined in the ordering information table and confirmed in the Absolute Maximum Ratings section of the datasheet.
How do I configure the LTC2905HDDB#TRMPBF for 5V and 3.3V supply monitoring with 5% tolerance?
To configure the LTC2905HDDB#TRMPBF for 5V/3.3V monitoring with 5% tolerance, connect S1 = V1, S2 = V1, and TOL = V1 per Table 1 and Table 2 in the datasheet. This selects the first row of the voltage threshold table and the 5% tolerance setting, resulting in nominal thresholds of 4.675V (5V) and 3.086V (3.3V) with ±1.5% accuracy.
Does the LTC2905HDDB#TRMPBF require external components for basic operation?
No, the LTC2905HDDB#TRMPBF requires no external resistors or capacitors for basic dual-supply monitoring. Only bypass capacitors (0.1µF on V1 and V2) and the optional CTMR capacitor on TMR are needed. The three-state programming pins (S1, S2, TOL) are configured directly to V1, GND, or left open - eliminating external resistor networks.
Can the LTC2905HDDB#TRMPBF monitor supplies below 1.0V?
No, the LTC2905HDDB#TRMPBF does not support monitoring supplies below 1.0V. Its V2 input is specified for 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, or 3.3V thresholds, with the lowest valid V2 threshold being 1.0V at 5% tolerance (VRT10 = 0.920V min). Operation with V1 or V2 < 1.0V is outside the Absolute Maximum Ratings and not characterized.
What is the function of the exposed pad on the LTC2905HDDB#TRMPBF DFN package?
The exposed pad (Pin 9) on the LTC2905HDDB#TRMPBF DFN package is electrically and thermally connected to GND. It must be soldered to a PCB GND plane to ensure proper thermal dissipation and electrical performance. The datasheet explicitly states "EXPOSED PAD IS GND (PIN 9), MUST BE SOLDERED TO PCB" in the package drawing notes.
LTC2905HDDB#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:
- 9 Selectable Threshold Combinations
- 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:
- 8-DFN (3x2)
LTC2905HDDB#TRMPBF FAQ
1.How can I place an order for LTC2905HDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2905HDDB#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 LTC2905HDDB#TRMPBF reliable?
The price and inventory of LTC2905HDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2905HDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2905HDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2905HDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2905HDDB#TRMPBF?
LTC2905HDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2905HDDB#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 LTC2905HDDB#TRMPBF?
For technical support, including LTC2905HDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2905HDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC2905HDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2905HDDB#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 LTC2905HDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2905HDDB#TRMPBF?
All LTC2905HDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2905HDDB#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 LTC2905HDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2905HDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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