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Analog Devices Inc. LTC2935CDC-4#TRMPBF
- Part No.:
- LTC2935CDC-4#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2935CDC-4#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,016
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Product details
Overview
LTC2935CDC-4#TRMPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with active-pull-up reset and power-fail outputs, 500nA quiescent current, ±1.5% threshold accuracy over temperature, and eight pin-selectable reset thresholds (e.g., 2.40V to 2.25V falling), used for battery-powered system initialization and controlled shutdown in portable electronics.
For engineers reviewing the LTC2935CDC-4#TRMPBF datasheet, LTC2935CDC-4#TRMPBF pinout, LTC2935CDC-4#TRMPBF application, or LTC2935CDC-4#TRMPBF equivalent, key selection considerations include its active-pull-up RST/PFO outputs, 200ms reset timeout, 8-lead 2mm × 2mm DFN package, and compatibility with 0°C to 70°C industrial ambient operation.
Technical Context
The LTC2935CDC-4#TRMPBF integrates dual comparators-one for reset (VRTF) and one for early-warning power-fail (VPFT)-with fixed 120mV differential between them. Its internal precision attenuators and hysteresis (5% on VRTF, 2.5% on VPFT) ensure noise immunity during supply transients.
Threshold selection uses three binary inputs (S2/S1/S0) tied to GND or VCC to configure one of eight discrete falling thresholds; MR input enables manual reset with 200ms timeout after release. The device operates from 1V to 5.5V VCC and delivers active-pull-up outputs referenced to VCC-not external rails.
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 temperature without calibration. |
| Reset Timeout Period | 200ms nominal - provides sufficient system stabilization time before releasing processor reset. |
| Power-Fail Threshold Offset | 120mV above selected reset threshold - guarantees deterministic early warning margin before reset triggers. |
| Supply Voltage Range | 1V to 5.5V - supports direct monitoring of Li-ion, alkaline stacks, and low-voltage logic rails. |
| Output Type | Active pull-up (RST & PFO) - eliminates external pull-up resistors and simplifies PCB layout. |
| Operating Temperature | 0°C to 70°C - validated for commercial/industrial portable equipment environments. |
Pinout & Package
Package: 8-lead, 2mm × 2mm plastic DFN (DC package) with exposed pad (optional GND connection). Pin pitch: 0.5mm. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply and monitored rail input | Supplies internal circuitry and serves as reference for all threshold comparisons; requires 0.1μF decoupling to GND. |
| MR | Manual reset input | Pull low to force RST low; internal 900kΩ pull-up to VCC; 20μs minimum pulse width required. |
| RST | Active-pull-up reset output | Drives high to VCC when valid; pulls low when VCC falls below selected threshold + 200ms delay on recovery. |
| PFO | Active-pull-up power-fail output | Drives high to VCC; pulls low when VCC falls below VPFT (120mV > VRTF); releases at VPFT + 2.5% hysteresis. |
| S2, S1, S0 | Binary threshold select inputs | Set one of eight reset/power-fail thresholds (e.g., S2=S1=S0=Low → VRTF = 2.44V, VPFT = 2.56V). |
| GND | Ground reference | Primary return path for all internal circuits; exposed pad may be connected to GND for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 500nA typical - reduces battery drain by >99% vs. legacy supervisors, extending shelf life. |
| Pin-selectable thresholds | Eight discrete reset options (2.25V–2.44V) and matching power-fail points - eliminates external resistor networks. |
| Integrated hysteresis | 5% on reset, 2.5% on power-fail - prevents output chatter during noisy or slowly recovering supplies. |
| Active-pull-up outputs | No external pull-ups needed - saves board space, reduces BOM count, and avoids voltage-level translation issues. |
| Glitch-immune comparator design | Validated against <1ms transients down to 0.1% overdrive - ensures robust operation in EMI-prone environments. |
Applications
| Portable Medical Sensors | Battery-Powered IoT Endpoints |
|---|---|
Use Scenario: Coin-cell–powered wearable glucose monitor operating for 2+ years without replacement. IC Role / Device Role / Timing Role: LTC2935CDC-4#TRMPBF monitors CR2032 voltage (nominal 3.0V), asserts PFO at 2.70V for low-battery alert and RST at 2.55V to halt measurement and preserve data. Use Value: Active-pull-up outputs interface directly with 1.8V microcontroller GPIOs; 500nA ICC extends usable battery life beyond 26 months. |
Use Scenario: LoRaWAN sensor node powered by two AA alkaline cells in remote environmental monitoring. IC Role / Device Role / Timing Role: LTC2935CDC-4#TRMPBF supervises 3.0V regulated rail, triggering PFO at 3.00V (early warning) and RST at 2.85V to initiate graceful sleep mode and EEPROM save. Use Value: Eight pin-selectable thresholds allow precise alignment with battery discharge curve; 200ms reset timeout ensures stable MCU boot after brownout recovery. |
| Point-of-Sale Handheld Terminals | Security System Peripherals |
Use Scenario: Handheld barcode scanner using rechargeable Li-ion with intermittent high-current pulses. IC Role / Device Role / Timing Role: LTC2935CDC-4#TRMPBF monitors 3.3V system rail, asserting PFO at 3.15V to signal imminent shutdown and RST at 3.00V to reset controller before undervoltage lockout. Use Value: ±1.5% threshold accuracy over temperature prevents false resets during hot/cold storage; DFN package fits tight 2-layer PCB layouts. |
Use Scenario: Wireless door/window sensor with tamper detection and motion-triggered wake-up. IC Role / Device Role / Timing Role: LTC2935CDC-4#TRMPBF supervises 2.4V LDO output powering RF transceiver and MCU, asserting PFO at 2.25V to trigger backup RAM save and RST at 2.10V to enter deep sleep. Use Value: Manual reset (MR) enables field firmware recovery via button press; low ICC preserves backup battery during 10-year shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2935ITS8-4#TRMPBF | Same functionality and pinout, but rated for –40°C to 85°C industrial temperature range. | Required for outdoor or automotive-adjacent deployments where ambient exceeds 70°C. | Select LTC2935ITS8-4#TRMPBF only if extended temperature qualification is mandatory; otherwise LTC2935CDC-4#TRMPBF suffices for commercial-grade designs. |
| LTC2934CDC-4#TRMPBF | Adjustable thresholds via external resistors (not pin-selectable); same 500nA ICC and active-pull-up outputs. | Used when fine-grained threshold tuning (e.g., 2.37V) is needed beyond the eight fixed LTC2935 options. | LTC2934CDC-4#TRMPBF adds BOM cost and layout area for resistors; choose only when pin-selectable thresholds are insufficient. |
Compared with LTC2935ITS8-4#TRMPBF, the LTC2935CDC-4#TRMPBF trades extended temperature range for lower cost and identical performance at 0°C–70°C; compared with LTC2934CDC-4#TRMPBF, it eliminates external components but fixes thresholds to eight factory-defined values.
Availability
LTC2935CDC-4#TRMPBF is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT endpoints, point-of-sale handheld terminals, and security system peripherals requiring stable component supply with long-term manufacturability.
Supply support for LTC2935CDC-4#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, including high-reliability supervisors, references, and power management ICs for demanding industrial and portable applications.
The LTC2935 family was designed specifically for ultra-low-power battery supervision with early-warning capability, targeting applications where every nanoamp and millisecond of timing margin matters-especially in coin-cell and energy-harvesting systems.
FAQ
What is the function of the S2, S1, and S0 pins on the LTC2935CDC-4#TRMPBF?
The S2, S1, and S0 pins on the LTC2935CDC-4#TRMPBF are binary-coded inputs that configure one of eight discrete reset thresholds (e.g., 2.44V, 2.32V, ..., 1.60V) and corresponding power-fail thresholds (120mV higher). Each combination of GND/VCC ties selects a specific pair, eliminating need for external resistor dividers. All three must be statically set at power-on; dynamic reconfiguration is not supported.
Does the LTC2935CDC-4#TRMPBF require external pull-up resistors on RST and PFO?
No. The LTC2935CDC-4#TRMPBF features active-pull-up outputs on both RST and PFO, driving high to VCC internally. Unlike open-drain variants (e.g., LTC2935-1), it requires no external pull-up resistors-reducing component count, saving board space, and avoiding level-shifting complications. Outputs remain valid even when VCC drops to 1V.
What is the reset timeout duration for the LTC2935CDC-4#TRMPBF, and how is it implemented?
The LTC2935CDC-4#TRMPBF has a fixed 200ms reset timeout period after VCC rises above the selected reset threshold plus 5% hysteresis. This delay is generated by an internal RC timer (900kΩ + capacitor) and is production-tested to 140ms–260ms. It ensures stable power delivery before releasing the RST signal to prevent premature MCU boot during supply ramp-up.
Can the LTC2935CDC-4#TRMPBF monitor a supply voltage lower than 2.25V?
No. The LTC2935CDC-4#TRMPBF's lowest pin-selectable reset threshold is 2.25V (S2=S1=S0=High), with corresponding power-fail at 2.37V. It does not support thresholds below 2.25V. For sub-2.25V monitoring (e.g., 1.8V rails), consider the LTC2935-3/-4 variants with lower ranges (1.60V–2.44V) or the LTC2934 with resistor-adjustable thresholds.
How does the power-fail output (PFO) behave relative to the reset output (RST) on the LTC2935CDC-4#TRMPBF?
On the LTC2935CDC-4#TRMPBF, the PFO asserts low when VCC falls below a threshold 120mV above the selected reset threshold (e.g., 2.56V if RST triggers at 2.44V). PFO releases when VCC rises above that same power-fail threshold plus 2.5% hysteresis. This creates a deterministic early-warning window-typically 10–20ms-enabling firmware to save state before RST activates.
LTC2935CDC-4#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LTC2935CDC-4#TRMPBF FAQ
1.How can I place an order for LTC2935CDC-4#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2935CDC-4#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-4#TRMPBF reliable?
The price and inventory of LTC2935CDC-4#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-4#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2935CDC-4#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2935CDC-4#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2935CDC-4#TRMPBF?
LTC2935CDC-4#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2935CDC-4#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-4#TRMPBF?
For technical support, including LTC2935CDC-4#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2935CDC-4#TRMPBF requirements.
6.How does Aetrix verify that LTC2935CDC-4#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2935CDC-4#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-4#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2935CDC-4#TRMPBF?
All LTC2935CDC-4#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2935CDC-4#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-4#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2935CDC-4#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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