My Inquiry
My Account
Analog Devices Inc. LTC2951CTS8-2#TRPBF
- Part No.:
- LTC2951CTS8-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2951CTS8-2#TRPBF.pdf
- Description:
- IC PB ON/OFF CONTROLLER TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,147
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2951CTS8-2#TRPBF from Analog Devices (formerly Linear Technology) is a micropower pushbutton ON/OFF controller with low-true enable output, operating across 2.7V–26.4V input voltage range and consuming only 6µA typical quiescent current. It features 128ms fixed turn-on debounce, adjustable turn-off timing via OFFT/KILLT pins, and ±10kV HBM ESD protection on PB input - used in portable instrumentation meters and blade servers for controlled system power sequencing.
For engineers reviewing the LTC2951CTS8-2#TRPBF datasheet, LTC2951CTS8-2#TRPBF pinout, LTC2951CTS8-2#TRPBF application, or LTC2951CTS8-2#TRPBF equivalent, key selection criteria include EN polarity (low-true), KILL comparator threshold (0.6V), internal 512ms KILL blanking time, and compatibility with TSOT-23-8 packaging for space-constrained embedded power management.
Technical Context
The LTC2951CTS8-2#TRPBF implements a dual-stage power control architecture: first, a 128ms turn-on debounce ensures reliable PB activation before asserting EN low; second, an interrupt-driven shutdown sequence uses INT to signal µP and KILL to confirm graceful power-down. Its KILL input serves both as a system fault timeout trigger and as a 0.6V precision voltage monitor.
Timing is partitioned across dedicated pins: OFFT sets additional turn-off debounce beyond the base 32ms, while KILLT extends the KILL turn-off delay beyond the default 128ms. The device operates without external clocking, relying on internal oscillators for all timing functions, and supports direct interface to DC/DC converter shutdown pins or external PFET gate drivers via its open-drain EN output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 26.4V - supports single-cell Li-ion up to 4-cell battery stacks and industrial 24V rails. |
| Quiescent Current | 6µA typical - enables multi-year battery life in always-on portable instrumentation. |
| EN Output Polarity | Low-true (LTC2951-2 variant) - sinks current to disable power when asserted, compatible with PFET high-side switches. |
| Turn-On Debounce | 128ms fixed - prevents false power-on from mechanical switch bounce or EMI transients. |
| KILL Threshold Voltage | 0.6V ±30mV - precise undervoltage detection for battery monitoring or fault signaling. |
| INT Output Type | Open-drain interrupt - pulls low to notify µP of valid PB press, requiring external pull-up. |
| ESD Rating (PB) | ±10kV HBM - robust against handling and field-level electrostatic discharge in handheld devices. |
Pinout & Package
Package: 8-lead Plastic TSOT-23 (TS8), 2.9mm × 1.6mm footprint, exposed pad optional for thermal relief. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power supply input | Accepts 2.7V–26.4V; powers internal regulators 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 rated. |
| KILLT (Pin 3) | KILL turn-off delay capacitor input | Connects to ground via capacitor to extend KILL timeout beyond 128ms default (e.g., 0.033µF adds ~11.5ms). |
| GND (Pin 4) | Ground reference | Primary return path for VIN, PB, KILL, INT, EN; exposed pad may be connected here for thermal performance. |
| INT (Pin 5) | Interrupt output | Open-drain, 0.11V VOL at 3mA; signals µP after valid PB hold (tDB,OFF + tOFFT) to initiate shutdown. |
| EN (Pin 6) | Enable output (low-true) | Open-drain, sinks current to disable downstream power; 0.11V VOL at 3mA; 0–10V output range. |
| OFFT (Pin 7) | Turn-off debounce capacitor input | Connects to ground via capacitor to extend PB hold time beyond 32ms default (e.g., 0.033µF adds ~11.5ms). |
| KILL (Pin 8) | Fault timeout / voltage monitor input | 0.6V threshold with 10–50mV hysteresis; blanked for 512ms after power-on; minimum 30µs pulse width. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable power-off timing | Independent OFFT and KILLT capacitor inputs allow fine-tuned control over both PB hold duration and KILL timeout - critical for systems with variable µP boot/shutdown latency. |
| Graceful µP shutdown interface | INT output alerts host processor before power removal; KILL input confirms completion - eliminates uncontrolled brownout resets during firmware updates. |
| Wide-input, ultra-low-IQ | Operates from 2.7V to 26.4V while drawing only 6µA - enables direct connection to battery without burdening capacity in always-on portable equipment. |
| High-voltage rugged PB pin | Withstands –6V to 26.4V and ±10kV HBM - eliminates need for external TVS or level-shifting circuitry in industrial or automotive-adjacent applications. |
| Configurable EN polarity | LTC2951-2 version provides low-true EN output - directly drives gate of high-side PFET for battery disconnect or controls active-low SHDN pins on DC/DC converters. |
Applications
| Portable Instrumentation Meter | Blade Server Power Management |
|---|---|
|
Use Scenario: Handheld multimeter powered by dual AA batteries must survive >5 years on standby with instant-on capability and safe shutdown. IC Role / Device Role / Timing Role: LTC2951CTS8-2#TRPBF acts as primary power sequencer - monitors momentary PB, asserts EN low to enable DC/DC, and enforces 512ms KILL blanking to ensure full µP boot before accepting shutdown commands. Use Value: 6µA quiescent current extends battery life; ±10kV PB ESD rating withstands field technician handling; low-true EN directly controls PFET battery switch. |
Use Scenario: 1U blade server chassis requires coordinated power-up of CPU, memory, and I/O modules with fault-safe shutdown on thermal or voltage fault. IC Role / Device Role / Timing Role: LTC2951CTS8-2#TRPBF serves as centralized power arbiter - receives PB command, triggers INT to BMC, and releases EN only after KILL confirmation or KILL timeout. Use Value: 0.6V KILL threshold enables precise 12V rail monitoring; adjustable KILLT delay accommodates BMC firmware latency; TSOT-23 package saves board area in dense backplane layouts. |
| Desktop Computer Standby Control | Industrial PDA Power Sequencing |
|
Use Scenario: Desktop motherboard enters S5 soft-off state but retains ability to wake on front-panel power button press without AC adapter cycling. IC Role / Device Role / Timing Role: LTC2951CTS8-2#TRPBF manages +5VSB rail - holds EN low until valid PB press, then asserts EN to enable main 12V/3.3V rails while enforcing 128ms turn-on debounce. Use Value: 2.7V–26.4V input range accepts +5VSB or +12VSB sources; 256ms EN lockout prevents accidental restart during DC/DC decay; open-drain INT interfaces cleanly with southbridge GPIO. |
Use Scenario: Ruggedized PDA used in warehouse logistics must survive repeated drop-induced switch bounce and ESD events while maintaining reliable power cycling. IC Role / Device Role / Timing Role: LTC2951CTS8-2#TRPBF functions as hardened power controller - filters noisy PB traces via RC network, uses KILL input for battery UVLO, and asserts low-true EN to disable PMIC. Use Value: Built-in 128ms debounce eliminates need for firmware filtering; ±10kV PB ESD rating exceeds IEC 61000-4-2 Level 4; TSOT-23 package resists mechanical shock better than DFN in handheld form factors. |
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 supply monitor with manual reset; no adjustable debounce, no KILL timeout, no PB high-voltage tolerance. | Only suitable for simple reset generation - lacks INT/KILL handshake, PB timing control, and wide-VIN operation. | Select only if system requires basic POR/reset without controlled sequencing or battery monitoring. |
| MAX16054ETA+ | 3.0V–5.5V supply range; 20µA IQ; no KILL input; fixed 100ms debounce; no OFFT/KILLT capacitor adjustment. | Designed for low-voltage embedded systems - cannot support 24V rails or extended timing needed for complex µP shutdown. | Choose only for cost-sensitive, low-VIN applications where timing flexibility and fault timeout are not required. |
Compared with TPS3808G33DBVR and MAX16054ETA+, the LTC2951CTS8-2#TRPBF uniquely combines wide-VIN operation, ultra-low IQ, programmable timing, and robust PB/KILL interfaces - making it the only option capable of implementing fail-safe, µP-coordinated power sequencing in battery-powered or industrial 24V systems.
Availability
LTC2951CTS8-2#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation meters, blade server chassis, and industrial PDAs requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSOT-23 packaging.
Supply support for LTC2951CTS8-2#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 precision analog and power management portfolio. Linear pioneered high-performance power control ICs with emphasis on low quiescent current and robust signal integrity.
The LTC2951 series was designed specifically for intelligent, µP-coordinated power sequencing in portable and industrial systems - addressing the need for reliable pushbutton control, fault-safe shutdown, and battery-aware voltage monitoring in space-constrained designs.
FAQ
What is the EN output behavior of the LTC2951CTS8-2#TRPBF?
The LTC2951CTS8-2#TRPBF features a low-true open-drain EN output (LTC2951-2 variant). It remains high-impedance until a valid 128ms PB press occurs, then pulls low to enable downstream power. EN releases high upon KILL assertion, second PB press, or KILL timeout. This polarity directly drives high-side PFET gates or active-low DC/DC SHDN pins without inversion logic.
How does the KILL input function in the LTC2951CTS8-2#TRPBF?
In the LTC2951CTS8-2#TRPBF, the KILL input serves two roles: first, as a handshake signal confirming µP readiness for shutdown - pulled high after boot and driven low to release EN; second, as a 0.6V precision voltage monitor - if KILL falls below threshold during operation, EN releases immediately. It is blanked for 512ms after power-on to allow system stabilization.
Can the LTC2951CTS8-2#TRPBF operate from a single Li-ion cell?
Yes, the LTC2951CTS8-2#TRPBF operates from 2.7V to 26.4V, fully covering the 3.0V–4.2V range of a single Li-ion cell. Its 6µA typical quiescent current minimizes battery drain during standby, and the 0.6V KILL threshold allows accurate end-of-discharge detection when used with a resistor divider from VIN.
What is the purpose of the OFFT and KILLT pins on the LTC2951CTS8-2#TRPBF?
The OFFT pin adds adjustable time to the base 32ms turn-off debounce - a capacitor to ground extends the required PB hold duration before initiating shutdown. The KILLT pin extends the base 128ms KILL timeout - a capacitor to ground delays EN release after INT goes low, ensuring µP has sufficient time to complete shutdown tasks before power removal.
Is the LTC2951CTS8-2#TRPBF pin-compatible with the DFN-packaged LTC2951CDDB-2#TRPBF?
No, the LTC2951CTS8-2#TRPBF (TSOT-23-8) and LTC2951CDDB-2#TRPBF (3mm × 2mm DFN) share identical electrical functionality and pin functions but differ in physical layout, thermal characteristics, and solder pad geometry. They are not mechanically interchangeable - PCB redesign is required to substitute between packages.
LTC2951CTS8-2#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2951CTS8-2#TRPBF FAQ
1.How can I place an order for LTC2951CTS8-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2951CTS8-2#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 LTC2951CTS8-2#TRPBF reliable?
The price and inventory of LTC2951CTS8-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2951CTS8-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2951CTS8-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2951CTS8-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2951CTS8-2#TRPBF?
LTC2951CTS8-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2951CTS8-2#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 LTC2951CTS8-2#TRPBF?
For technical support, including LTC2951CTS8-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2951CTS8-2#TRPBF requirements.
6.How does Aetrix verify that LTC2951CTS8-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2951CTS8-2#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 LTC2951CTS8-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2951CTS8-2#TRPBF?
All LTC2951CTS8-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2951CTS8-2#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 LTC2951CTS8-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC2951CTS8-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2951CTS8-2#TRPBF Tags
-
UC3845AD8TR
Texas Instruments
-
UC2843AD8TR
Texas Instruments
-
LM3880MFX-1AE/NOPB
Texas Instruments
-
LM3880MFX-1AA/NOPB
Texas Instruments
-
INA234AIYBJR
Texas Instruments
-
INA700AYWFR
Texas Instruments
-
LM3880MF-1AE/NOPB
Texas Instruments
-
LM3880MF-1AA/NOPB
Texas Instruments
-
LM3881MM/NOPB
Texas Instruments
-
UCC2802DTR
Texas Instruments
-
NCP4305DMTTWG
onsemi
-
INA237AIDGSR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
