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Analog Devices Inc. LTC2956IUD-1#PBF
- Part No.:
- LTC2956IUD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 12-WFQFN Exposed Pad
- Datasheet:
-
LTC2956IUD-1#PBF.pdf
- Description:
- IC PB ON/OFF CONTROLLER 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,636
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Product details
Overview
LTC2956IUD-1#PBF from Analog Devices (formerly Linear Technology) is a micropower wake-up timer IC with pushbutton control and active-high enable output, designed for battery-powered systems requiring periodic power cycling. It operates from 1.5V to 36V, delivers 0.8µA quiescent current in sleep mode, supports adjustable wake-up periods from 250ms to 39 days via external resistors, and drives DC/DC converter shutdown pins directly-enabling ultra-low-power data acquisition in remote environmental sensors.
For engineers reviewing the LTC2956IUD-1#PBF datasheet, LTC2956IUD-1#PBF pinout, LTC2956IUD-1#PBF application, or LTC2956IUD-1#PBF equivalent, key selection criteria include its 12-lead 3mm × 3mm QFN package, –40°C to +85°C industrial temperature rating, EN output compatibility with regulator RUN/SHDN inputs, and precise tONMAX timing control via ONMAX capacitor (13.3ms/nF).
Technical Context
The LTC2956IUD-1#PBF implements a dual-stage timing architecture: a digitally controlled wake-up period counter (tPERIOD) and an analog/digital hybrid maximum awake timer (tONMAX) triggered by the ONMAX pin capacitor. Its internal 2kHz oscillator feeds a programmable divider (÷1 to ÷222) to set tPERIOD, while tONMAX uses both ramp-based analog sensing and digital counting for robust timeout detection.
It features three status outputs (ONALERT, OFFALERT, PBOUT), pushbutton debouncing with 32ms typical tDB, and configurable power-up behavior (RUN or SHUTDOWN mode) determined by the LONG pin voltage divider. The EN output is actively pulled high through a 900kΩ internal resistor to a 3.3V regulated supply during awake states and pulled low during sleep-optimized for direct interface with low-threshold DC/DC enable inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 36V - supports single-cell LiFePO₄ up to 24V industrial rails without external regulation |
| Quiescent Current (Sleep) | 0.8µA - enables >10-year battery life in coin-cell–powered intervalometers |
| Shutdown Current | 0.3µA - critical for shipped products with installed batteries to prevent shelf-life drain |
| Wake-Up Period Range | 250ms to 39 days - set via PERIOD/RANGE resistors; enables flexible duty cycling from sensor polling to monthly diagnostics |
| Max Awake Time Control | Adjustable via ONMAX capacitor (13.3ms/nF) - provides precise watchdog-limited on-time for microcontroller boot and task execution |
| EN Output Polarity | Active-high (LTC2956-1 variant) - directly interfaces with RUN pins of regulators like LT3060 without level-shifting |
| Operating Temperature | –40°C to +85°C - qualified for industrial outdoor deployments including smart metering and edge telemetry |
| ESD Rating (PB Pin) | ±25kV HBM - ensures robustness against user-handling ESD in handheld portable equipment |
Pinout & Package
Package: 12-lead 3mm × 3mm plastic QFN (UD package), exposed pad (Pin 13) connected to GND for thermal and electrical performance. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 1.5V–36V unregulated input; includes 1.24V UVLO with 100mV hysteresis for brownout immunity |
| GND | Device ground reference | Primary return path; exposed pad (Pin 13) must be soldered to PCB ground plane for θJA = ~68°C/W |
| EN | Active-high enable output | Pulled high internally to 3.3V rail during awake state; sinks <0.4V at 1mA - drives RUN/SHDN of buck regulators directly |
| PB | Pushbutton input | Active-low with 900kΩ internal pull-up; ±25kV HBM protection; debounced with 32ms typical delay |
| SLEEP | System sleep control input | Falling-edge–triggered to force immediate sleep; held high >tLONG (128ms–16.4s) enters shutdown mode |
| ONMAX | Maximum awake time capacitor input | Connects to GND via capacitor; sets tONMAX = 13.3ms/nF - acts as hardware watchdog for firmware hangs |
| PERIOD | Wake-up timer period resistor input | Resistor to GND sets base tPERIOD; combined with RANGE pin to select scaling factor (×1, ×4, … ×222) |
| RANGE | Timer range selection input | Resistor divider with PERIOD/LONG defines tPERIOD multiplier; enables 39-day max period with 100kΩ RPERIOD |
| LONG | Long-press timeout configuration | Resistor to GND sets tLONG (128ms–16.4s); determines PB/SLEEP hold duration required to enter shutdown |
| ONALERT | On-alert open-drain output | Pulled low for entire awake duration after exiting shutdown - signals MCU to execute boot initialization |
| OFFALERT | Off-alert open-drain output | Pulled low for 1s (tOFF) during shutdown transition - alerts system to perform graceful power-down tasks |
| PBOUT | Debounced pushbutton echo | Open-drain replica of debounced PB signal; used for software menu navigation or interrupt generation |
Key Features
| Feature | Design Value |
|---|---|
| Configurable wake-up period (250ms–39 days) | Set via two external resistors (PERIOD + RANGE), enabling one-time hardware tuning without firmware changes |
| Hardware-enforced maximum awake time | tONMAX controlled by capacitor value (13.3ms/nF), preventing runaway power consumption during MCU lockup |
| Three independent status outputs | ONALERT, OFFALERT, and PBOUT provide deterministic timing signals for system-level event synchronization |
| Programmable power-up mode | LONG pin voltage divider selects RUN or SHUTDOWN at power-on - eliminates need for external reset sequencing |
| Ultra-low shutdown current (0.3µA) | Enables indefinite storage with battery installed; meets IEC 62368-1 leakage requirements for consumer portables |
| Integrated pushbutton debouncing | 32ms internal timer eliminates need for external RC filters or firmware debounce logic |
Applications
| Remote Environmental Sensor Node | Smart Utility Meter Interval Logging |
|---|---|
Use Scenario: Battery-powered soil moisture sensor deployed in agricultural fields, waking every 6 hours to measure and transmit data via LoRaWAN. IC Role / Device Role / Timing Role: LTC2956IUD-1#PBF controls power to MCU, sensor, and radio; initiates wake-up cycle and enforces 200ms max awake window for measurement/transmission. Use Value: 0.8µA sleep current extends CR2032 battery life beyond 5 years; tONMAX capacitor prevents radio transmission hang from draining battery. |
Use Scenario: Municipal water meter with embedded NB-IoT module, logging flow rate every 15 minutes and transmitting daily summaries. IC Role / Device Role / Timing Role: LTC2956IUD-1#PBF gates power to metrology ASIC and cellular modem; uses 100kΩ PERIOD resistor for precise 15-minute intervals. Use Value: 36V input tolerance accommodates wide-range battery+capacitor backup; OFFALERT pulse triggers secure data flush before power removal. |
| Industrial Predictive Maintenance Edge Logger | Portable Medical Vital Signs Recorder |
Use Scenario: Vibration-sensing logger mounted on factory motors, capturing accelerometer data every 2 hours and storing locally until USB retrieval. IC Role / Device Role / Timing Role: LTC2956IUD-1#PBF powers MCU and MEMS sensor only during scheduled sampling; SLEEP pin toggled by MCU to terminate awake state early. Use Value: Active-high EN output directly enables TPS62864 buck converter; tSLEEP_MIN (128ms) ensures full discharge between cycles to avoid false wake-ups. |
Use Scenario: Handheld ECG recorder used in clinics, powered by rechargeable Li-ion, requiring manual on/off via tactile button and auto-shutdown after idle. IC Role / Device Role / Timing Role: LTC2956IUD-1#PBF serves as primary power controller; PB input handles user press/release, LONG resistor configures 5s shutdown hold time. Use Value: ±25kV HBM on PB pin withstands clinical handling ESD; ONALERT pulse synchronizes MCU boot sequence with display initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wake-up timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3897A33DBVR | Fixed 3.3V supply monitor with reset and watchdog; no configurable wake-up timer or pushbutton control | Only provides power-fail reset and basic watchdog; cannot replace periodic wake-up functionality | Select only if system already has external timer/MCU control and requires supplemental voltage monitoring |
| MAX16054ASA+ | Single-channel supervisor with programmable reset timeout (1ms–16s); lacks multi-day wake-up, ONMAX watchdog, or PB debouncing | Supports short-interval resets but not ultra-low-power long-period scheduling or hardware-initiated shutdown | Choose when needing sub-second reset coordination in existing 3.3V systems, not for battery-cycling applications |
Compared with TPS3897A33DBVR and MAX16054ASA+, the LTC2956IUD-1#PBF uniquely integrates micropower periodic wake-up, pushbutton-driven state transitions, and hardware-enforced awake limits - making it irreplaceable for autonomous, battery-constrained intervalometers where firmware-level timing is unreliable or unavailable.
Availability
LTC2956IUD-1#PBF is available at Aetrix Electronics and suitable for remote environmental sensing, smart utility metering, and industrial predictive maintenance applications requiring stable component supply across extended product lifecycles.
Supply support for LTC2956IUD-1#PBF 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 technical and manufacturing continuity for all Linear precision analog and power management ICs.
The LTC2956IUD-1#PBF belongs to Linear's micropower system supervision product line, engineered specifically for energy-constrained applications demanding reliable, hardware-based power cycling without MCU intervention.
FAQ
What is the operating temperature range for the LTC2956IUD-1#PBF?
The LTC2956IUD-1#PBF is rated for –40°C to +85°C, qualifying it for industrial environments including outdoor metering, automotive under-hood telemetry, and factory-floor edge devices. This grade matches the "I" suffix in the part number and is verified per the Absolute Maximum Ratings table in the official datasheet.
How does the LTC2956IUD-1#PBF differ from the LTC2956IUD-2#PBF?
The LTC2956IUD-1#PBF features an active-high EN output optimized for driving RUN/SHDN pins of DC/DC converters like the LT3060, while the LTC2956IUD-2#PBF provides an active-low EN output capable of directly controlling P-channel MOSFET gates. Both share identical timing, packaging, and temperature specs - only the EN polarity and internal pull structure differ.
Can the LTC2956IUD-1#PBF be used without a microcontroller?
Yes - the LTC2956IUD-1#PBF is designed for standalone operation. With SLEEP tied low and a capacitor on ONMAX, it autonomously cycles power to attached circuitry (e.g., sensor + transmitter). No firmware or host processor is required, making it ideal for passive intervalometers and simple battery-powered monitors.
What is the purpose of the OFFALERT pin on the LTC2956IUD-1#PBF?
The OFFALERT pin on the LTC2956IUD-1#PBF pulls low for exactly 1 second (tOFF) during the transition from RUN to SHUTDOWN mode. This provides a deterministic hardware signal to trigger last-moment actions - such as saving volatile data to EEPROM or disabling RF transceivers - before system power is removed.
How is the wake-up period configured on the LTC2956IUD-1#PBF?
The wake-up period on the LTC2956IUD-1#PBF is set using two external resistors: one from PERIOD to GND (RPERIOD = 32.4kΩ–324kΩ) and another from RANGE to GND (RRANGE), with a fixed 100kΩ resistor between RANGE and LONG. Together they select both base period and scaling factor, enabling adjustment from 250ms to 39 days without firmware.
LTC2956IUD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Wake Up Timer
- Voltage - Input:
- -
- Voltage - Supply:
- 1.5V ~ 36V
- Current - Supply:
- 3 µA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-QFN (3x3)
LTC2956IUD-1#PBF FAQ
1.How can I place an order for LTC2956IUD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2956IUD-1#PBF 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 LTC2956IUD-1#PBF reliable?
The price and inventory of LTC2956IUD-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2956IUD-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC2956IUD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2956IUD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2956IUD-1#PBF?
LTC2956IUD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2956IUD-1#PBF 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 LTC2956IUD-1#PBF?
For technical support, including LTC2956IUD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2956IUD-1#PBF requirements.
6.How does Aetrix verify that LTC2956IUD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2956IUD-1#PBF 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 LTC2956IUD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC2956IUD-1#PBF?
All LTC2956IUD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2956IUD-1#PBF, 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 LTC2956IUD-1#PBF part is unused and in its original packaging.
Return procedure for LTC2956IUD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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