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Analog Devices Inc. LTC2935IDC-2#TRMPBF
- Part No.:
- LTC2935IDC-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2935IDC-2#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,005
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Product details
Overview
LTC2935IDC-2#TRMPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with pin-selectable reset and power-fail thresholds, active-pull-up RST/PFO outputs, and 500nA quiescent current. It provides system initialization, early warning of supply collapse, and reset generation for battery-powered systems operating from –40°C to 85°C. Key confirmed parameters: 200ms reset timeout, ±1.5% threshold accuracy over temperature, eight selectable reset thresholds (e.g., 2.40V–3.30V), 2mm × 2mm DFN package, and VCC monitoring range up to 5.5V.
For engineers reviewing the LTC2935IDC-2#TRMPBF datasheet, LTC2935IDC-2#TRMPBF pinout, LTC2935IDC-2#TRMPBF application, or LTC2935IDC-2#TRMPBF equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios in portable and security systems, and two validated alternative parts with documented functional differences - all derived from official Analog Devices documentation.
Technical Context
The LTC2935IDC-2#TRMPBF integrates dual comparators with precision internal attenuators and hysteresis control: one for reset (5% rising hysteresis) and one for power-fail (2.5% rising hysteresis). Its S2/S1/S0 inputs configure eight discrete falling reset thresholds between 2.25V and 3.30V, with corresponding PFO thresholds fixed 150mV higher. The device uses an internal RC-based 200ms reset timer and supports manual reset via MR input with 20μs minimum pulse width.
As an active-pull-up variant (LTC2935-2 family), it drives RST and PFO high to VCC without external resistors, eliminating pull-up loading and enabling direct interfacing with CMOS logic. Its 500nA ICC at 3.6V and operation down to 1V VCC make it suitable for deep-sleep battery monitoring where leakage must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500nA typical - enables multi-year battery life in coin-cell or alkaline-powered devices. |
| Reset Threshold Accuracy | ±1.5% max over –40°C to 85°C - ensures reliable reset assertion across industrial temperature range. |
| Reset Timeout Period | 200ms nominal - guarantees sufficient processor initialization time after VCC recovery. |
| Power-Fail Threshold Offset | +150mV above selected reset threshold - provides deterministic early-warning margin before reset. |
| Supply Voltage Range | 1V to 5.5V - supports operation during deep brownout and compatibility with Li-ion, alkaline, and coin-cell sources. |
| Output Type | Active pull-up (LTC2935-2) - eliminates external pull-up resistors and simplifies PCB layout. |
| Package | 8-Lead (2mm × 2mm) Plastic DFN - compact footprint ideal for space-constrained portable designs. |
Pinout & Package
Package: 8-Lead (2mm × 2mm) Plastic DFN with exposed pad (optional GND connection). Pin 1 marked by notch or bar; top-side marking "LDQC" per order information.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply and monitored voltage input | Primary supply rail under supervision; requires 0.1μF decoupling to GND. |
| MR | Manual reset input | Logic-low pulse ≥20μs forces RST low for 200ms; internally pulled up to VCC via 900kΩ. |
| RST | Active-pull-up reset output | Drives high to VCC when active; pulls low on undervoltage; no external pull-up needed. |
| PFO | Active-pull-up power-fail output | Asserts low when VCC drops below configured PFO threshold; released after +2.5% hysteresis. |
| S2, S1, S0 | Binary threshold selection inputs | Three logic inputs (GND/VCC) select one of eight reset/PFO threshold pairs (e.g., S2=S1=S0=Low → 3.30V/3.45V). |
| GND | Device ground reference | Return path for all internal circuits; exposed pad may be connected to PCB GND for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 500nA typical - reduces battery drain in always-on monitoring applications. |
| Eight pin-selectable thresholds | Configurable reset (2.25V–3.30V) and PFO (2.40V–3.45V) thresholds via S2/S1/S0 - eliminates external resistor networks. |
| Early warning power-fail output | Dedicated PFO with fixed +150mV offset - enables controlled shutdown before system reset occurs. |
| 200ms reset timeout with hysteresis | Guaranteed 140–260ms delay on VCC rise, plus 5% hysteresis - prevents chatter during noisy or slow-rising supplies. |
| Active pull-up outputs | RST and PFO drive high to VCC - removes need for external pull-ups and avoids level-shifting complexity. |
Applications
| Alkaline Cell Stack Monitoring | Coin Cell Voltage Supervision |
|---|---|
|
Use Scenario: Monitoring 3×AA alkaline stack (4.5V nominal) in handheld POS terminal during battery depletion. IC Role / Device Role / Timing Role: LTC2935IDC-2#TRMPBF monitors VCC and asserts PFO at 3.00V (early warning) then RST at 2.85V (system halt) using S2=Low, S1=High, S0=Low configuration. Use Value: Enables firmware to save transaction state before power loss, leveraging deterministic 150mV PFO margin and 200ms reset hold time. |
Use Scenario: CR2032-powered wireless sensor node requiring >5-year shelf life and low-voltage shutdown. IC Role / Device Role / Timing Role: LTC2935IDC-2#TRMPBF supervises 3.0V nominal coin cell; configured for 2.55V reset and 2.70V PFO (S2=High, S1=High, S0=Low) to trigger BLE disconnect prior to brownout. Use Value: 500nA ICC extends battery life; active-pull-up outputs interface directly with ultra-low-power MCU GPIO without external components. |
| Security System Backup Power Monitor | Portable Medical Device Battery Management |
|
Use Scenario: Tamper-proof alarm panel with lithium backup battery that must detect impending failure before main power loss. IC Role / Device Role / Timing Role: LTC2935IDC-2#TRMPBF monitors backup rail; PFO triggers NMI interrupt to initiate secure log write, while RST holds microcontroller in reset if voltage collapses. Use Value: Dual-threshold architecture ensures fail-safe response: PFO gives ≥20ms warning window before RST assertion at same VCC slope. |
Use Scenario: Portable glucose meter powered by single AAA battery, requiring precise low-voltage cutoff to prevent erroneous readings. IC Role / Device Role / Timing Role: LTC2935IDC-2#TRMPBF configured for 2.40V reset (S2=High, S1=Low, S0=High) and 2.55V PFO to alert user 30 seconds before auto-shutdown. Use Value: ±1.5% threshold accuracy over temperature ensures consistent cutoff across clinical environments (0°C–40°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2935ITS8-2#TRMPBF | Identical electrical specs and pinout, but in 8-lead TSOT-23 package (3.0mm × 1.7mm vs. 2mm × 2mm DFN). | Preferred for designs requiring smaller height or standard SOT-23 reflow profiles; thermal resistance higher (θJA = 195°C/W vs. 102°C/W). | Select when board space allows larger footprint but lower profile is critical; verify thermal derating in sealed enclosures. |
| LTC2934IDC-2#TRMPBF | Same family, but uses external resistor divider for threshold adjustment (not pin-selectable); 500nA ICC, 200ms timeout, active-pull-up outputs. | Offers continuous threshold tuning (1.2V–5.5V) instead of 8 discrete points; requires two external resistors and layout area. | Choose when application demands non-standard thresholds (e.g., 2.92V) not covered by LTC2935IDC-2#TRMPBF's fixed table. |
Compared with LTC2935ITS8-2#TRMPBF, the LTC2935IDC-2#TRMPBF offers superior thermal performance in compact layouts; compared with LTC2934IDC-2#TRMPBF, it eliminates external components and tolerance stack-up at the cost of threshold flexibility.
Availability
LTC2935IDC-2#TRMPBF is available at Aetrix Electronics and suitable for portable equipment, battery-powered security systems, and point-of-sale devices requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature range (–40°C to 85°C).
Supply support for LTC2935IDC-2#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 precision analog portfolio. Linear Technology was renowned for high-performance power management and signal conditioning ICs with rigorous automotive and industrial qualification.
The LTC2935IDC-2#TRMPBF belongs to Linear's ultra-low-power supervisor product line, designed specifically for battery-critical applications where nanoscale current draw, deterministic reset timing, and minimal external components are mandatory.
FAQ
What is the operating temperature range for the LTC2935IDC-2#TRMPBF?
The LTC2935IDC-2#TRMPBF is rated for –40°C to 85°C ambient operation (Industrial grade, denoted by the "I" in the part number). This is confirmed in the Absolute Maximum Ratings table and Order Information section, where "LTC2935IDC-2#TRMPBF" is explicitly listed with "–40°C to 85°C" temperature range and "LDQC" DFN package marking.
Does the LTC2935IDC-2#TRMPBF require external pull-up resistors on RST and PFO?
No. The LTC2935IDC-2#TRMPBF is the LTC2935-2 variant, which features active pull-up outputs. As stated in the Applications Information section, "The active pull-up options (LTC2935-2/LTC2935-4) eliminate the need for external pull-up resistors on the status outputs. Integrated pull-up devices pull the outputs up to VCC." This is a key differentiator from the open-drain LTC2935-1/-3 variants.
How is the reset threshold selected on the LTC2935IDC-2#TRMPBF?
The reset threshold is selected using the three binary inputs S2, S1, and S0, each tied to GND or VCC. For example, S2=Low, S1=Low, S0=Low configures a 3.30V reset threshold (and 3.45V PFO threshold). The Falling Threshold Selection Table on page 1 of the datasheet lists all eight combinations and their corresponding voltages - all confirmed for the LTC2935-2 family including LTC2935IDC-2#TRMPBF.
What is the power-fail threshold offset relative to the reset threshold for the LTC2935IDC-2#TRMPBF?
The power-fail threshold is fixed at +150mV above the selected reset threshold for the LTC2935-2 family, including the LTC2935IDC-2#TRMPBF. This is explicitly stated in the Applications Information section: "In the LTC2935-1/LTC2935-2 the power-fail threshold is always 150mV higher than the configured reset threshold." Electrical Characteristics confirm ΔVPFT = 100–200mV (typical 150mV) for LTC2935-1/-2.
Can the LTC2935IDC-2#TRMPBF operate with VCC as low as 1V?
Yes. The Absolute Maximum Ratings specify VCC down to –0.3V, and the Electrical Characteristics table shows VOL tested at VCC = 1V (25–100mV max with 200μA pull-up). The Applications Information states: "When voltage is initially applied to VCC, RST and PFO pull low once there is enough voltage to turn on the pull-down devices (1V maximum)." This confirms functional operation starting near 1V.
LTC2935IDC-2#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:
- 1
- Voltage - Threshold:
- 8 Selectable Threshold Combinations
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LTC2935IDC-2#TRMPBF FAQ
1.How can I place an order for LTC2935IDC-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2935IDC-2#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 LTC2935IDC-2#TRMPBF reliable?
The price and inventory of LTC2935IDC-2#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2935IDC-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2935IDC-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2935IDC-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2935IDC-2#TRMPBF?
LTC2935IDC-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2935IDC-2#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 LTC2935IDC-2#TRMPBF?
For technical support, including LTC2935IDC-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2935IDC-2#TRMPBF requirements.
6.How does Aetrix verify that LTC2935IDC-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2935IDC-2#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 LTC2935IDC-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2935IDC-2#TRMPBF?
All LTC2935IDC-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2935IDC-2#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 LTC2935IDC-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2935IDC-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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