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Analog Devices Inc. LTC2905HDDB#TRPBF
- Part No.:
- LTC2905HDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2905HDDB#TRPBF.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,394
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Product details
Overview
LTC2905HDDB#TRPBF from Analog Devices (formerly Linear Technology) is a precision dual supply monitor IC with adjustable reset timeout, ±1.5% threshold accuracy over –40°C to 125°C, open-drain RST output, and pin-selectable voltage thresholds (e.g., 5V/3.3V, 3.3V/1.2V) for embedded power sequencing in automotive and industrial control systems.
For engineers reviewing the LTC2905HDDB#TRPBF datasheet, LTC2905HDDB#TRPBF pinout, LTC2905HDDB#TRPBF application, or LTC2905HDDB#TRPBF equivalent, key selection criteria include its high-temperature operation (–40°C to 125°C), programmable reset delay via external capacitor (CTMR), 8-pin DFN package with exposed thermal pad, and guaranteed RST assertion down to V1 ≥ 1V or V2 ≥ 1V.
Technical Context
The LTC2905HDDB#TRPBF implements two independent comparators with a shared reset pulse generator and three-state programming inputs (S1, S2, TOL) that configure nominal input pairs and tolerance (5%/7.5%/10%) without external resistors. Its internal bandgap reference and resistor network ensure stable threshold tracking across temperature.
Unlike the fixed 200ms delay of LTC2904, the LTC2905HDDB#TRPBF uses the TMR pin to accept an external capacitor (e.g., 22nF for 200ms), enabling precise timing adjustment from ~200μs to >10s. The RST output is open-drain with weak internal pull-up (~6μA) and strong pull-down (<40Ω), supporting wired-OR reset buses and compatibility with 1.0V–7V supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive and harsh industrial environments. |
| Threshold Accuracy | ±1.5% of nominal V1/V2 over full temperature range - enables tight supply margining without derating. |
| Reset Timeout | Adjustable via CTMR (9 ms/nF); 22nF yields 200ms - supports diverse microprocessor power-up timing requirements. |
| V1/V2 Input Range | V1: 5V/3.3V/2.5V; V2: 3.3V/2.5V/1.8V/1.5V/1.2V/1.0V - covers core I/O rail combinations in modern SoC/FPGA systems. |
| RST Output Type | Open-drain with guaranteed VOL ≤ 0.4V at 2.5mA and VOH ≥ VCC–1V - allows level-shifting and multi-source reset arbitration. |
| Supply Immunity | Glitch immunity via comparator low-pass filtering and programmable delay - prevents false resets during transient noise events. |
| Package | 8-lead (3mm × 2mm) DFN with exposed GND pad - provides low thermal resistance (θJA = 76°C/W) and space-efficient layout. |
Pinout & Package
Package: 8-lead plastic DFN (3mm × 2mm), exposed thermal pad (Pin 9, GND), RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V2 (Pin 1) | Voltage Input 2 | Selects second monitored rail (e.g., 3.3V, 1.2V); also contributes to internal VCC if greater than V1. |
| TMR (Pin 2) | Reset Delay Timing Input | Connects to external capacitor (CTMR) to set tRST; open = ~200μs minimum delay. |
| RST (Pin 3) | Inverted Reset Output | Open-drain active-low output; asserts low when any input falls below threshold and holds for tRST. |
| GND (Pin 4) | Ground Reference | Primary ground connection; exposed pad (Pin 9) must be soldered to PCB for thermal and electrical performance. |
| TOL (Pin 5) | Tolerance Select Input | Three-state pin: V1 = 5%, open = 7.5%, GND = 10% - sets common hysteresis for both V1 and V2. |
| S1 (Pin 6) | Voltage Threshold Select 1 | Three-state pin defining V1/V2 pair (e.g., V1=3.3V, V2=1.2V); see Table 1 in datasheet. |
| S2 (Pin 7) | Voltage Threshold Select 2 | Second three-state pin completing V1/V2 combination selection; open/GND/V1 states enable 9 configurations. |
| V1 (Pin 8) | Voltage Input 1 | Selects first monitored rail (5V/3.3V/2.5V); bypass with ≥0.1μF capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Precision dual monitoring | ±1.5% threshold accuracy over –40°C to +125°C ensures reliable brownout detection without over-margining. |
| Pin-programmable thresholds | 9 V1/V2 combinations (e.g., 5V/3.3V, 3.3V/1.2V) and 3 tolerances selected via S1/S2/TOL - eliminates BOM proliferation. |
| Adjustable reset timeout | tRST = 9 ms/nF via external CTMR (22nF → 200ms) - matches processor-specific reset hold times. |
| Low-voltage reset guarantee | RST asserted correctly for V1 ≥ 1V or V2 ≥ 1V - enables robust power-up sequencing in ultra-low-VCC systems. |
| Glitch-immune architecture | Comparator low-pass filtering + programmable delay prevents false triggers from supply transients <1/tRST. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Sequencing |
|---|---|
Use Scenario: Monitoring 5V sensor supply and 3.3V MCU core rail in engine bay under wide temperature swings. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting system reset if either rail drops below programmed threshold (e.g., 5V@5%, 3.3V@5%) for >200ms. Use Value: Prevents ECU lockup during cold cranking or load dump by ensuring clean reset before firmware execution. | Use Scenario: Coordinating startup of 24V fieldbus interface and 12V logic supply in factory automation controllers. IC Role / Device Role / Timing Role: Simultaneous monitoring of 24V and 12V rails with asymmetric tolerance (10% on 24V, 5% on 12V) and 200ms delay. Use Value: Eliminates need for discrete RC timers and voltage dividers, reducing component count and board area by >30%. |
| Medical Imaging Power Management | Telecom Base Station FPGA Configuration |
Use Scenario: Validating 1.8V ADC reference and 1.2V FPGA I/O supplies during MRI scanner power-up. IC Role / Device Role / Timing Role: High-accuracy (±1.5%) dual monitor with 3.3V/1.8V configuration and 100ms reset delay via 11nF CTMR. Use Value: Ensures analog signal chain integrity by preventing data acquisition until all supplies stabilize within spec. | Use Scenario: Enabling safe FPGA configuration after 3.3V auxiliary and 1.0V core supplies reach regulation. IC Role / Device Role / Timing Role: Dual monitor with 3.3V/1.0V thresholds, 7.5% tolerance, and 200ms delay to meet Xilinx Spartan-7 power-on requirements. Use Value: Guarantees bitstream loading only after stable VCCINT and VCCAUX, avoiding configuration failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6816EUT+T | Fixed 3.3V/1.8V thresholds; no tolerance programming; 200ms fixed delay; SOT-23-6 package. | Limited to single V1/V2 pair; no CTMR adjustment; lower temp grade (–40°C to +85°C). | Choose for cost-sensitive, fixed-rail designs where programmability is unnecessary. |
| TPS3808G18DBVR | Single-supply monitor (1.8V only); adjustable delay via CTMR; ±0.5% accuracy; SOT-23-6. | Monitors one rail only; requires two devices for dual-rail; higher accuracy but no V1/V2 pairing logic. | Use when monitoring isolated rails independently or when tighter threshold tolerance is critical. |
Compared with MAX6816EUT+T and TPS3808G18DBVR, the LTC2905HDDB#TRPBF uniquely combines dual-rail monitoring, pin-selectable thresholds/tolerances, adjustable delay, and extended temperature operation - making it optimal for space-constrained, high-reliability systems requiring flexible supply supervision.
Availability
LTC2905HDDB#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, medical imaging subsystems, and telecom base station power management requiring stable component supply across extended temperature ranges.
Supply support for LTC2905HDDB#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 acquired Linear Technology in 2017 and maintains its high-performance analog IC portfolio, emphasizing precision, reliability, and ruggedized design for mission-critical applications.
The LTC2905HDDB#TRPBF belongs to Linear's precision power monitoring product line, engineered specifically for dual-rail systems demanding accurate, glitch-immune reset generation across extreme temperatures without external passive components.
FAQ
What is the maximum operating temperature of the LTC2905HDDB#TRPBF?
The LTC2905HDDB#TRPBF is rated for operation from –40°C to +125°C, making it suitable for under-hood automotive and high-temperature industrial environments. This H-grade qualification exceeds standard commercial (0°C to 70°C) and industrial (–40°C to 85°C) grades, and is confirmed in the "ORDER INFORMATION" table of the datasheet.
How do I configure the LTC2905HDDB#TRPBF for 5V and 3.3V monitoring with 5% tolerance?
To configure the LTC2905HDDB#TRPBF for 5V/3.3V monitoring at 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 mode, yielding typical thresholds of 4.675V (5V) and 3.086V (3.3V).
Can the LTC2905HDDB#TRPBF operate with only one supply voltage above 1V?
Yes - the LTC2905HDDB#TRPBF guarantees correct RST output state when either V1 ≥ 1V or V2 ≥ 1V, as stated in the "FEATURES" list and Electrical Characteristics table (VCCMIN = 1V). This enables reliable reset assertion during asymmetric power-up sequences where one rail rises significantly faster than the other.
What is the recommended capacitor value for a 200ms reset timeout on the LTC2905HDDB#TRPBF?
A 22nF capacitor connected between the TMR pin and GND yields a nominal 200ms reset timeout for the LTC2905HDDB#TRPBF, calculated using tRST = CTMR × 9 ms/nF (22nF × 9 ms/nF = 198ms ≈ 200ms). This value is explicitly cited in the Typical Application diagram (TA01) and Electrical Characteristics table.
Does the LTC2905HDDB#TRPBF require external pull-up resistors on the RST pin?
The LTC2905HDDB#TRPBF includes a weak internal pull-up (~6μA) on RST, eliminating external resistors when rise time is non-critical. However, an external pull-up (e.g., 10kΩ) is recommended if fast rise time (<1μs) or VOH > VCC is required, as noted in the Applications Information section on "Output Rise and Fall Time Estimation".
LTC2905HDDB#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC2905HDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2905HDDB#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 LTC2905HDDB#TRPBF reliable?
The price and inventory of LTC2905HDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2905HDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2905HDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2905HDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2905HDDB#TRPBF?
LTC2905HDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2905HDDB#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 LTC2905HDDB#TRPBF?
For technical support, including LTC2905HDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2905HDDB#TRPBF requirements.
6.How does Aetrix verify that LTC2905HDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2905HDDB#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 LTC2905HDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2905HDDB#TRPBF?
All LTC2905HDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2905HDDB#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 LTC2905HDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC2905HDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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