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Analog Devices Inc. LTC2951ITS8-2#TRPBF
- Part No.:
- LTC2951ITS8-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2951ITS8-2#TRPBF.pdf
- Description:
- IC PB ON/OFF CONTROLLER TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,612
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Product details
Overview
LTC2951ITS8-2#TRPBF from Analog Devices (formerly Linear Technology) is a micropower pushbutton ON/OFF controller with negative-enable polarity (EN low-true), operating from 2.7V to 26.4V input, featuring 6µA quiescent current, 128ms turn-on debounce, and adjustable KILL timeout for fail-safe power-down in battery-powered systems such as portable instrumentation and blade servers.
For engineers reviewing the LTC2951ITS8-2#TRPBF datasheet, LTC2951ITS8-2#TRPBF pinout, LTC2951ITS8-2#TRPBF application, or LTC2951ITS8-2#TRPBF equivalent, key selection criteria include its –40°C to +85°C industrial temperature grade, TSOT-23-8 package, KILL input threshold of 0.6V ±30mV, EN output leakage <±0.1µA, and compatibility with circuit breaker control via active-low enable.
Technical Context
The LTC2951ITS8-2#TRPBF implements a dual-stage timing architecture: fixed 128ms turn-on debounce (tDB,ON) followed by a 512ms KILL blanking window (tKILL,ON BLANK), during which the µP must assert KILL high to prevent automatic shutdown. Its KILL path includes both internal 128ms turn-off delay (tKILL,OFF DELAY) and externally adjustable extension via KILLT capacitor.
It uses open-drain outputs (EN, INT) with VOL ≤0.4V at 3mA, supports high-voltage PB input (–6V to 26.4V) with ±10kV HBM ESD rating, and integrates accurate 0.6V KILL comparator with 10–50mV hysteresis-enabling reliable voltage monitoring and fault-triggered power-down without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 26.4V - supports single-cell Li-ion up to 4-cell stacks and industrial 24V rails |
| IIN (Quiescent) | 6µA typical - enables multi-year battery life in always-on portable devices |
| tDB,ON | 128ms fixed - prevents false turn-on from mechanical switch bounce |
| KILL Threshold | 0.6V ±30mV - allows precise undervoltage detection using simple resistor dividers |
| EN Polarity | Active-low (LTC2951-2) - directly drives circuit breakers or PFET gates requiring low-side enable |
| Temp Range | –40°C to +85°C - qualified for industrial embedded and automotive under-hood auxiliary systems |
| Package | TSOT-23-8 - 2.9mm × 1.6mm footprint compatible with high-density PCB layouts |
Pinout & Package
Package: 8-Lead Plastic TSOT-23 (3mm × 1.6mm body, 0.65mm pitch), exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power supply input | Accepts 2.7V–26.4V; powers internal regulator and logic; absolute max 33V |
| PB (Pin 2) | Pushbutton input | High-voltage tolerant (–6V to 26.4V); internal 100kΩ pull-up to 1.9V bias; ±10kV HBM ESD rated |
| KILLT (Pin 3) | KILL turn-off delay adjust | Capacitor-to-ground sets additional KILL timeout beyond default 128ms (e.g., 1500pF adds ~11.5ms) |
| GND (Pin 4) | Ground reference | Primary return path; exposed pad may be connected to GND for improved thermal performance |
| INT (Pin 5) | Open-drain interrupt output | Signals µP when valid PB press detected; sinks ≥3mA; VOL ≤0.4V at 3mA |
| EN (Pin 6) | Open-drain enable output | Active-low (LTC2951-2); drives circuit breakers or PFET gates; 0V–10V output range; leakage <±0.1µA |
| OFFT (Pin 7) | Turn-off debounce adjust | Capacitor-to-ground extends PB hold time beyond default 32ms (e.g., 1500pF adds ~11.5ms) |
| KILL (Pin 8) | Failsafe shutdown input | 0.6V threshold comparator; triggers EN release if not pulled high within 512ms after power-on or if held low during operation |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable KILL timeout | Combines fixed 128ms internal delay with external capacitor on KILLT for system-level fault response tuning |
| Industrial temperature grade | –40°C to +85°C operation ensures reliability in uncontrolled environments like factory automation and outdoor electronics |
| Low-power pushbutton interface | 6µA supply current enables continuous monitoring without compromising battery runtime in handheld instruments |
| High-voltage PB input | Supports direct connection to 24V rails or automotive batteries without level-shifting; immune to –6V transients |
| Integrated voltage monitor capability | KILL pin functions as precision 0.6V comparator, enabling battery undervoltage detection with minimal external components |
Applications
| Portable Instrumentation Meters | Blade Servers |
|---|---|
Use Scenario: Handheld multimeter powered by two AA cells, requiring long shelf life and instant-on responsiveness. IC Role / Device Role / Timing Role: LTC2951ITS8-2#TRPBF acts as primary power sequencer, asserting EN low only after 128ms PB press and verifying µP readiness via KILL handshake before full power-up. Use Value: 6µA quiescent current extends battery life to >5 years in standby; KILL blanking prevents spurious shutdown during cold-start voltage sag. | Use Scenario: 1U server chassis with hot-swap power modules and redundant controllers requiring coordinated power sequencing. IC Role / Device Role / Timing Role: LTC2951ITS8-2#TRPBF provides independent, fail-safe power control per module, using KILL to trigger immediate EN release upon thermal or overcurrent fault signal from management ASIC. Use Value: Adjustable KILLT delay ensures sufficient time for fault logging before forced shutdown; TSOT-23-8 saves board space in dense backplane layouts. |
| Desktop and Notebook Computers | Portable Customer Service PDA |
Use Scenario: Embedded controller managing auxiliary power rails (e.g., USB-C PD port, fan controller) in thin-and-light laptops. IC Role / Device Role / Timing Role: LTC2951ITS8-2#TRPBF serves as secondary power manager, interfacing with main SoC via INT/KILL to coordinate graceful shutdown during battery depletion. Use Value: 0.6V KILL threshold enables direct connection to battery voltage divider, eliminating need for dedicated supervisor IC and reducing BOM count. | Use Scenario: Ruggedized field service PDA used in warehouses, powered by removable Li-ion pack with strict energy budget. IC Role / Device Role / Timing Role: LTC2951ITS8-2#TRPBF controls main system power, using OFFT capacitor to extend PB hold time to 50ms-preventing accidental power-off during brief button presses in glove use. Use Value: TSOT-23-8 package withstands mechanical shock; ±10kV PB ESD rating ensures robustness against static discharge in dry environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar pushbutton power control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no KILL handshake or adjustable timers; 1.6µA IQ; SOT-23-5 | Basic reset-only function; lacks pushbutton sequencing, INT interrupt, or fail-safe KILL timeout | Select only for simple undervoltage reset where full ON/OFF control and µP coordination are unnecessary |
| MAX16054ATA+T | Wider VIN (1.8V–36V); 12µA IQ; fixed 200ms debounce; no KILL input; TDFN-8 | Supports lower-voltage systems but omits critical KILL fault-handling and µP handshake capability | Choose when higher input voltage range is required but KILL-based fail-safe shutdown is not needed |
Compared with TPS3808G33DBVR and MAX16054ATA+T, the LTC2951ITS8-2#TRPBF uniquely combines industrial temperature operation, adjustable KILL/turn-off timing, and µP-interrupt handshaking-making it the only option that fully satisfies requirements for controlled, fault-resilient power sequencing in battery-backed embedded systems.
Availability
LTC2951ITS8-2#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation meters, blade servers, and desktop/notebook computers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2951ITS8-2#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 its legacy precision analog and power management portfolio with full technical and manufacturing continuity.
The LTC2951 series was designed specifically for intelligent, low-power pushbutton power sequencing in battery-operated and industrial systems-emphasizing fail-safe behavior, wide VIN tolerance, and seamless µP integration via INT/KILL signaling.
FAQ
What is the operating temperature range for the LTC2951ITS8-2#TRPBF?
The LTC2951ITS8-2#TRPBF is rated for –40°C to +85°C operation, qualifying it for industrial embedded applications including factory automation, outdoor instrumentation, and automotive auxiliary systems where ambient temperatures exceed commercial grade limits. This specification is confirmed in the Absolute Maximum Ratings table and Order Information section of the official datasheet.
How does the KILL input function in the LTC2951ITS8-2#TRPBF?
The KILL input in the LTC2951ITS8-2#TRPBF is a precision 0.6V comparator that initiates immediate EN release when driven low. During power-on, it is blanked for 512ms (tKILL,ON BLANK) to allow system stabilization; during normal operation, pulling KILL low forces EN low within 30µs (tKILL,PD). The LTC2951ITS8-2#TRPBF also supports voltage monitoring by connecting KILL to a resistor divider from VIN.
What is the difference between LTC2951-1 and LTC2951-2 versions?
The LTC2951-1 features an active-high EN output (EN asserted high), while the LTC2951-2-used in the LTC2951ITS8-2#TRPBF-has an active-low EN output (EN asserted low). Both share identical timing, voltage ratings, pinout, and functionality except for EN polarity, making LTC2951ITS8-2#TRPBF ideal for driving circuit breakers or NMOS/NPN switches requiring low-side enable control.
Can the LTC2951ITS8-2#TRPBF operate from a single-cell Li-ion battery?
Yes, the LTC2951ITS8-2#TRPBF operates from 2.7V to 26.4V, covering the full discharge range of a single-cell Li-ion battery (4.2V down to ~2.8V). Its 6µA quiescent current minimizes drain during standby, and the 0.6V KILL threshold allows direct battery voltage monitoring using a high-impedance resistor divider-enabling low-battery shutdown without additional supervisory ICs.
What package type is used for the LTC2951ITS8-2#TRPBF?
The LTC2951ITS8-2#TRPBF uses the 8-Lead Plastic TSOT-23 package (also referenced as TS8), measuring 2.9mm × 1.6mm with 0.65mm lead pitch. This compact outline is documented in the Package Description section (page 18) and Order Information table, and is distinct from the larger 3mm × 2mm DFN option used in DDB variants.
LTC2951ITS8-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2951ITS8-2#TRPBF FAQ
1.How can I place an order for LTC2951ITS8-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2951ITS8-2#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 LTC2951ITS8-2#TRPBF reliable?
The price and inventory of LTC2951ITS8-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2951ITS8-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2951ITS8-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2951ITS8-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2951ITS8-2#TRPBF?
LTC2951ITS8-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2951ITS8-2#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 LTC2951ITS8-2#TRPBF?
For technical support, including LTC2951ITS8-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2951ITS8-2#TRPBF requirements.
6.How does Aetrix verify that LTC2951ITS8-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2951ITS8-2#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 LTC2951ITS8-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2951ITS8-2#TRPBF?
All LTC2951ITS8-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2951ITS8-2#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 LTC2951ITS8-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC2951ITS8-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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