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Analog Devices Inc. LTC2935CDC-3#TRMPBF
- Part No.:
- LTC2935CDC-3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2935CDC-3#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,449
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Product details
Overview
LTC2935CDC-3#TRMPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with open-drain reset and power-fail outputs, eight pin-selectable reset thresholds (1.60V–2.40V), ±1.5% threshold accuracy over temperature, and 500nA typical quiescent current - designed for battery-powered portable equipment requiring reliable early-warning low-voltage detection and system reset.
For engineers reviewing the LTC2935CDC-3#TRMPBF datasheet, LTC2935CDC-3#TRMPBF pinout, LTC2935CDC-3#TRMPBF application, or LTC2935CDC-3#TRMPBF equivalent, key selection criteria include its 200ms reset timeout, 120mV fixed power-fail hysteresis margin above reset threshold, 8-lead 2mm × 2mm DFN package with exposed pad, and compatibility with coin-cell and alkaline stack monitoring in space-constrained designs.
Technical Context
The LTC2935CDC-3#TRMPBF integrates two precision comparators: one for reset generation at a user-configured falling VCC threshold (eight options via S2/S1/S0), and a second for early power-fail warning at a fixed 120mV higher threshold. Its internal 5% hysteresis on reset release and 2.5% hysteresis on PFO release prevent output chatter during supply transients.
It features a manual reset input (MR) with 200ms debounced release timing, open-drain RST and PFO outputs rated to 6V (independent of VCC), and operates across 0°C to 70°C ambient. The device draws only 500nA at 3.6V, enabling multi-year operation on primary batteries without measurable drain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500nA typical - enables >10-year battery life in coin-cell applications with no measurable impact on runtime. |
| Reset Threshold Range | 1.60V to 2.40V (8 pin-selectable values) - supports direct monitoring of single Li-ion, dual alkaline, or CR2032 cells without external resistors. |
| Power-Fail Margin | +120mV above selected reset threshold - provides deterministic early warning window before system reset triggers. |
| Reset Timeout | 200ms after VCC exceeds threshold +5% hysteresis - ensures stable power-up before releasing processor reset. |
| Accuracy | ±1.5% max over 0°C to 70°C - guarantees reliable trip points across industrial temperature range without calibration. |
| Output Type | Open-drain RST and PFO - allows level-shifting up to 6V, enabling interface with higher-voltage logic or mixed-supply systems. |
| Supply Voltage Range | VCC = 1V to 5.5V - operates down to near-dead battery voltage, supporting deep discharge monitoring. |
Pinout & Package
Package: 8-lead, 2mm × 2mm plastic DFN (DC package) with exposed thermal pad (pin 9, optional GND connection). RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Monitored supply input and IC power rail | Accepts 1V–5.5V; must be bypassed with ≥0.01μF capacitor to GND for noise immunity. |
| MR | Manual reset input | Pull low to force reset; internal 900kΩ pull-up to VCC; 20μs minimum pulse width required. |
| RST | Open-drain reset output | Active-low; sinks current when VCC falls below selected threshold; requires external pull-up resistor. |
| PFO | Open-drain power-fail output | Active-low; asserts earlier than RST at fixed +120mV margin; used for NMI or controlled shutdown prep. |
| S2, S1, S0 | Binary threshold select inputs | Three logic inputs (GND/VCC) configure one of eight reset/power-fail threshold pairs per table. |
| GND | Ground reference | Primary return path; exposed pad may be connected to PCB ground for improved thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 500nA typical - preserves battery capacity in always-on, long-life devices like security sensors and wearables. |
| Pin-selectable thresholds | Eight discrete reset options (1.60V–2.40V) and corresponding PFO points - eliminates need for external resistor dividers or trimming. |
| Dual comparator architecture | Independent reset and power-fail comparators with fixed 120mV offset - delivers deterministic early-warning timing without software intervention. |
| 200ms reset timeout with hysteresis | Guaranteed 200ms delay after VCC rises above threshold +5% - prevents premature release during brown-out recovery. |
| Open-drain outputs with 6V rating | RST and PFO tolerate up to 6V pull-up voltage - enables interfacing with 3.3V/5V logic domains or high-side monitoring circuits. |
Applications
| Portable Medical Sensors | Coin-Cell IoT Endpoints |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 battery, requiring low-power supervision and graceful shutdown before voltage collapse. IC Role / Device Role / Timing Role: LTC2935CDC-3#TRMPBF monitors VCC, asserts PFO at 2.55V to trigger data save to EEPROM, then asserts RST at 2.40V to halt MCU. Use Value: 500nA quiescent current extends battery life beyond 2 years; 120mV PFO margin ensures ≥10 seconds of safe shutdown time. |
Use Scenario: Bluetooth LE beacon using single alkaline AA cell, needing accurate low-battery warning and reset coordination with RF SoC. IC Role / Device Role / Timing Role: LTC2935CDC-3#TRMPBF configures S2/S1/S0 for 1.72V reset and 1.84V PFO to match alkaline discharge curve. Use Value: ±1.5% threshold accuracy over temperature avoids false warnings in outdoor deployments; 2mm × 2mm DFN fits tight PCB footprints. |
| Point-of-Sale Peripheral | Industrial Handheld Scanner |
Use Scenario: Battery-backed barcode scanner with USB-C charging, requiring robust power sequencing and brown-out protection during hot-swap events. IC Role / Device Role / Timing Role: LTC2935CDC-3#TRMPBF supervises 3.3V LDO output, using MR for user-initiated reset and PFO to disable motor drivers pre-reset. Use Value: Open-drain outputs isolate reset domain from USB power rail; 200ms timeout prevents spurious resets during transient dips. |
Use Scenario: Ruggedized handheld RFID reader operating on rechargeable Li-ion, needing fail-safe reset under cold-temperature discharge conditions. IC Role / Device Role / Timing Role: LTC2935CDC-3#TRMPBF set to 2.20V/2.32V thresholds tracks Li-ion voltage sag at –20°C while maintaining ±1.5% accuracy. Use Value: Guaranteed operation from 0°C to 70°C ambient ensures reliability in warehouse environments; DFN package withstands mechanical shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2935ITS8-3#TRMPBF | Same functionality and pinout, but rated for –40°C to 85°C industrial temperature range. | Required for extended-temperature deployments (e.g., automotive accessory modules, outdoor kiosks). | Select when ambient operating temperature exceeds 70°C or drops below 0°C. |
| LTC2934CTS8-3#TRMPBF | Adjustable thresholds via external resistors (not pin-selectable); 400nA typical ICC; same DFN/TSOT-23 packages. | Better for designs requiring non-standard thresholds (e.g., 1.92V, 2.67V) not covered by LTC2935's eight fixed points. | Choose when precise custom thresholds outweigh convenience of pin-strapping. |
Compared with LTC2935ITS8-3#TRMPBF, the LTC2935CDC-3#TRMPBF trades extended temperature range for lower cost and qualification in commercial-grade applications; versus LTC2934CTS8-3#TRMPBF, it offers faster design iteration with no resistor selection or layout changes, at the expense of threshold flexibility.
Availability
LTC2935CDC-3#TRMPBF is available at Aetrix Electronics and suitable for portable medical sensors, coin-cell IoT endpoints, point-of-sale peripherals, industrial handheld scanners, and battery-backed security systems requiring stable component supply and long-term lifecycle support.
Supply support for LTC2935CDC-3#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 full product continuity, quality control, and technical documentation for all Linear voltage supervisors.
The LTC2935 family was designed specifically for ultra-low-power battery monitoring in portable and energy-harvesting systems, emphasizing minimal ICC, high threshold accuracy, and integrated early-warning capability without external components.
FAQ
What is the maximum supply voltage the LTC2935CDC-3#TRMPBF can monitor?
The LTC2935CDC-3#TRMPBF monitors VCC over a 1V to 5.5V range. Absolute maximum rating is 6V, but operation above 5.5V violates specification limits and risks unreliable threshold behavior. For systems with higher rail voltages (e.g., 12V), use a resistive divider to scale the input within the 1V–5.5V window while maintaining accuracy.
How does the power-fail output (PFO) relate to the reset threshold in the LTC2935CDC-3#TRMPBF?
In the LTC2935CDC-3#TRMPBF, the PFO threshold is fixed at exactly 120mV above the selected reset threshold (e.g., 2.40V reset → 2.52V PFO). This margin is factory-trimmed and guaranteed across temperature, providing deterministic early warning without external components or calibration.
Can the LTC2935CDC-3#TRMPBF operate with a 1.5V alkaline battery directly connected to VCC?
Yes - the LTC2935CDC-3#TRMPBF functions down to 1V VCC and supports reset thresholds as low as 1.60V. With S2/S1/S0 configured for the lowest threshold (1.60V), it reliably detects end-of-life in 1.5V alkaline cells while drawing only 500nA, preserving usable battery capacity.
What is the purpose of the exposed pad on the LTC2935CDC-3#TRMPBF DFN package?
The exposed pad (pin 9) on the LTC2935CDC-3#TRMPBF serves as a thermal path to the PCB. It may be left floating or soldered to a GND plane for improved thermal dissipation. No electrical connection is required, but grounding reduces junction temperature by ~10°C under continuous operation - beneficial for high-ambient or high-density layouts.
Does the LTC2935CDC-3#TRMPBF require external pull-up resistors on RST and PFO?
Yes - because the LTC2935CDC-3#TRMPBF uses open-drain outputs, external pull-up resistors are mandatory for both RST and PFO to achieve valid logic-high states. Recommended values range from 10kΩ to 470kΩ; 100kΩ is typical for balancing speed, power, and noise immunity in battery-powered systems.
LTC2935CDC-3#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:
- 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 (2x2)
LTC2935CDC-3#TRMPBF FAQ
1.How can I place an order for LTC2935CDC-3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2935CDC-3#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 LTC2935CDC-3#TRMPBF reliable?
The price and inventory of LTC2935CDC-3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2935CDC-3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2935CDC-3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2935CDC-3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2935CDC-3#TRMPBF?
LTC2935CDC-3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2935CDC-3#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 LTC2935CDC-3#TRMPBF?
For technical support, including LTC2935CDC-3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2935CDC-3#TRMPBF requirements.
6.How does Aetrix verify that LTC2935CDC-3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2935CDC-3#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 LTC2935CDC-3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2935CDC-3#TRMPBF?
All LTC2935CDC-3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2935CDC-3#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 LTC2935CDC-3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2935CDC-3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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