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Analog Devices Inc. LTC2950CDDB-1#TRPBF
- Part No.:
- LTC2950CDDB-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2950CDDB-1#TRPBF.pdf
- Description:
- IC PUSH BUTTON ON/OFF CTRLR 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,303
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Product details
Overview
LTC2950CDDB-1#TRPBF from Analog Devices (formerly Linear Technology) is a micropower pushbutton ON/OFF controller with high-true open-drain EN output, operating across 2.7V–26.4V input voltage range and consuming only 6µA typical quiescent current. It implements independently programmable ON/OFF debounce (32ms default + adjustable via external capacitor), KILL-input-controlled graceful µP shutdown, and internal 512ms turn-on blanking timer. It is used in portable instrumentation meters and blade servers requiring reliable, low-power system power sequencing.
For engineers reviewing the LTC2950CDDB-1#TRPBF datasheet, LTC2950CDDB-1#TRPBF pinout, LTC2950CDDB-1#TRPBF application, or LTC2950CDDB-1#TRPBF equivalent, key selection criteria include EN polarity (high-true), KILL threshold accuracy (0.6V ±30mV), DFN-8 (3mm × 2mm) package compatibility, and support for DC/DC converter enable control without external level-shifting.
Technical Context
The LTC2950CDDB-1#TRPBF integrates a precision 0.6V KILL comparator with 30mV hysteresis, a 512ms KILL turn-on blanking timer, and a fixed 1024ms KILL turn-off delay. Its PB input features ±10kV HBM ESD protection and operates up to 26.4V with internal 100kΩ pull-up to 1.9V bias.
Debounce timing is split: ONT and OFFT pins accept external capacitors to extend internal 32ms default ON/OFF times per tONT/tOFFT = 11.5ms ±2.5ms at 1500pF. The INT pin delivers open-drain interrupt signaling to µP upon valid PB press, initiating controlled shutdown before EN release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 26.4V - supports wide-input industrial and battery-powered systems without external regulation. |
| IIN (Quiescent) | 6µA typical - enables multi-year operation on coin-cell or Li-ion batteries. |
| EN Polarity | High-true open-drain - directly interfaces with DC/DC converter SHDN pins having internal pull-up (e.g., LT1767-3.3). |
| KILL Threshold | 0.6V ±0.03V - provides accurate undervoltage monitoring when used with resistor divider on VIN. |
| tDB,ON Default | 32ms - prevents false turn-on from mechanical switch bounce; extended via ONT capacitor. |
| tKILL,ON BLANK | 512ms - guarantees sufficient time for DC/DC startup and µP initialization before KILL sampling begins. |
| tKILL,OFF DELAY | 1024ms - sets maximum grace period for µP housekeeping before automatic EN release. |
Pinout & Package
Package: 8-lead 3mm × 2mm plastic DFN (DDB8), exposed pad (Pin 9) optional GND connection. RoHS-compliant, lead-free finish, tape-and-reel (TRPBF = 2500 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power supply input | Accepts 2.7V–26.4V; powers internal circuitry and supplies bias for PB pull-up. |
| PB (Pin 2) | Pushbutton input | High-voltage tolerant (–6V to 26.4V); internal 100kΩ pull-up to 1.9V; ±10kV HBM ESD rated. |
| ONT (Pin 3) | Turn-on time adjustment | Capacitor-to-GND extends default 32ms ON debounce; 11.5ms ±2.5ms per 1500pF. |
| GND (Pin 4) | Ground reference | Primary return path; exposed pad may be connected here for thermal/mechanical stability. |
| INT (Pin 5) | Open-drain interrupt output | Asserted low upon valid PB press to signal µP start of shutdown sequence. |
| EN (Pin 6) | High-true enable output | Open-drain; pulled high by external or DC/DC-integrated pull-up; controls system power rail. |
| OFFT (Pin 7) | Turn-off time adjustment | Capacitor-to-GND extends default 32ms OFF debounce; 11.5ms ±2.5ms per 1500pF. |
| KILL (Pin 8) | Graceful shutdown control input | 0.6V threshold; must go high within 512ms of EN assertion to prevent abort; pulls EN low when driven low. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VIN range (2.7V–26.4V) | Eliminates need for pre-regulation in 3.3V–24V systems, reducing BOM count and board space. |
| 6µA quiescent current | Enables >10-year battery life in always-on portable instruments using CR2032 or single Li-ion cells. |
| Programmable ON/OFF debounce | ONT/OFFT pins allow precise tuning of press-hold duration (32ms base + up to ~100ms) to match mechanical switch characteristics. |
| 0.6V KILL comparator with hysteresis | Supports accurate battery voltage monitoring (e.g., 5.4V trip via R-divider) without external reference or comparator. |
| 512ms KILL blanking timer | Prevents premature shutdown during power-up transients; ensures µP and DC/DC are fully operational before KILL sampling. |
| 1024ms KILL turn-off delay | Guarantees deterministic µP shutdown window-critical for data integrity in embedded storage and communication modules. |
Applications
| Portable Instrumentation Meters | Blade Servers |
|---|---|
|
Use Scenario: Handheld multimeter powered by 9V alkaline battery with momentary pushbutton power control. IC Role / Device Role / Timing Role: LTC2950CDDB-1#TRPBF acts as primary power sequencer-asserting EN to enable buck converter only after clean 32ms+ button press, then enforcing 512ms blanking before accepting KILL from MCU. Use Value: Prevents accidental power-on from switch bounce; enables full battery utilization down to 2.7V; reduces standby current to 6µA for >5-year shelf life. |
Use Scenario: Hot-swap power management in 1U server chassis with redundant 12V inputs and FPGA-based supervisor. IC Role / Device Role / Timing Role: LTC2950CDDB-1#TRPBF provides hardware-enforced power-on coordination: EN enables main 3.3V rail only after FPGA asserts KILL high within 512ms, ensuring configuration load completes before peripherals power up. Use Value: Eliminates race conditions between power rails and FPGA configuration; guarantees deterministic boot state across thousands of field units. |
| Desktop and Notebook Computers | Adjustable Pushbutton On/Off Timers |
|
Use Scenario: Embedded controller managing auxiliary 5V standby rail and USB-C PD negotiation logic in thin-client laptop. IC Role / Device Role / Timing Role: LTC2950CDDB-1#TRPBF serves as secure power gate-PB initiates wake, INT alerts EC, KILL confirms readiness, and EN releases 5VSB only after EC validates PD contract. Use Value: Enforces strict power-state handshaking between EC and PD controller; prevents partial power-up that could corrupt USB enumeration. |
Use Scenario: Industrial timer module with user-adjustable ON duration (1–60s) using rotary encoder and tactile switch. IC Role / Device Role / Timing Role: LTC2950CDDB-1#TRPBF handles physical button interface and timing foundation-ONT/OFFT capacitors set minimum ON/OFF hold times, while KILL enables microcontroller-driven variable timeout extension. Use Value: Offloads debounce and timing-critical logic from firmware; maintains precise timing even during MCU reset or brownout events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar pushbutton power control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2951CDDB-1#TRPBF | Includes programmable power-off timer (1–32s) not present in LTC2950CDDB-1#TRPBF; otherwise identical pinout, EN polarity, and KILL behavior. | Required where fixed 1024ms shutdown window is insufficient and µP-independent timeout extension is needed. | Select LTC2951CDDB-1#TRPBF if system requires configurable power-off delay without µP intervention. |
| LTC2953CDDB-1#TRPBF | Adds integrated 200ms voltage reset monitor and higher-voltage KILL input (up to 36V); shares same DFN-8 package and EN/INT/KILL/PB pin functions. | Suitable for designs needing simultaneous pushbutton control and supply-voltage supervision (e.g., brownout detection on main rail). | Choose LTC2953CDDB-1#TRPBF when combined ON/OFF sequencing and reset generation are required in one device. |
Compared with LTC2951CDDB-1#TRPBF and LTC2953CDDB-1#TRPBF, the LTC2950CDDB-1#TRPBF offers minimal-feature, lowest-quiescent-current implementation ideal for cost-sensitive, battery-constrained applications where only basic debounced pushbutton control and µP handshake are needed.
Availability
LTC2950CDDB-1#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation meters, blade servers, and desktop/notebook computers requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC2950CDDB-1#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 full technical and manufacturing continuity for all Linear ICs, including the LTC2950 family.
The LTC2950 product line delivers micropower, wide-VIN pushbutton controllers optimized for battery-powered and industrial systems requiring robust, low-overhead power sequencing with µP coordination.
FAQ
What is the EN output polarity of LTC2950CDDB-1#TRPBF?
The LTC2950CDDB-1#TRPBF features a high-true open-drain EN output (LTC2950-1 variant). When asserted, EN is pulled high via external or DC/DC-integrated pull-up; it releases low to disable system power. This differs from the LTC2950-2 variant (e.g., LTC2950CDDB-2#TRPBF), which provides low-true EN.
How does the KILL input function during power-on sequencing of LTC2950CDDB-1#TRPBF?
During power-on, the LTC2950CDDB-1#TRPBF enforces a 512ms KILL blanking period after EN assertion. During this time, KILL is ignored-preventing premature shutdown. If KILL remains low beyond 512ms, EN is released, aborting power-on. This ensures DC/DC and µP have time to stabilize before KILL validation begins.
Can LTC2950CDDB-1#TRPBF operate with a 3.3V supply and still drive a 12V DC/DC enable pin?
Yes. The LTC2950CDDB-1#TRPBF's EN pin is open-drain with 0V–10V output voltage rating. When used with a 12V pull-up resistor (or DC/DC converter with internal 12V pull-up), EN can reliably assert high to enable 12V rails-even when VIN = 3.3V. No level-shifter is required.
What is the purpose of the ONT and OFFT pins on LTC2950CDDB-1#TRPBF?
The ONT and OFFT pins on LTC2950CDDB-1#TRPBF accept external capacitors to extend the internal 32ms default debounce times. A 1500pF capacitor adds ~11.5ms to both turn-on and turn-off durations. Floating these pins reverts to the fixed 32ms timing-ideal for standard tactile switches without custom timing needs.
Is the exposed pad (Pin 9) of LTC2950CDDB-1#TRPBF required to be connected to GND?
No. The exposed pad (Pin 9) on the LTC2950CDDB-1#TRPBF DFN package is optional for GND connection. It may be left unconnected for minimal thermal requirements, or soldered to PCB GND plane to improve thermal dissipation and mechanical reliability-especially in high-temperature or high-vibration environments.
LTC2950CDDB-1#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
- Applications:
- Push Button, On/Off Controller
- Voltage - Input:
- -
- Voltage - Supply:
- 2.7V ~ 26.4V
- Current - Supply:
- 6 µA
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2950CDDB-1#TRPBF FAQ
1.How can I place an order for LTC2950CDDB-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2950CDDB-1#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 LTC2950CDDB-1#TRPBF reliable?
The price and inventory of LTC2950CDDB-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2950CDDB-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2950CDDB-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2950CDDB-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2950CDDB-1#TRPBF?
LTC2950CDDB-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2950CDDB-1#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 LTC2950CDDB-1#TRPBF?
For technical support, including LTC2950CDDB-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2950CDDB-1#TRPBF requirements.
6.How does Aetrix verify that LTC2950CDDB-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2950CDDB-1#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 LTC2950CDDB-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2950CDDB-1#TRPBF?
All LTC2950CDDB-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2950CDDB-1#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 LTC2950CDDB-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2950CDDB-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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