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Analog Devices Inc. LTC2955CTS8-2#TRPBF
- Part No.:
- LTC2955CTS8-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2955CTS8-2#TRPBF.pdf
- Description:
- IC PB ON/OFF CTRLR TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:9,033
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Product details
Overview
LTC2955CTS8-2#TRPBF from Analog Devices (formerly Linear Technology) is a micropower pushbutton on/off controller with active-low enable output, designed to manage system power sequencing in battery-powered and industrial embedded systems. It operates from 1.5V to 36V supply, features ±36V robust PB input tolerance, 1.2µA quiescent current, and supports automatic turn-on via voltage monitor (ON pin). It is used in portable instruments and automotive electronics for graceful microprocessor shutdown and forced power-down.
For engineers reviewing the LTC2955CTS8-2#TRPBF datasheet, LTC2955CTS8-2#TRPBF pinout, LTC2955CTS8-2#TRPBF application, or LTC2955CTS8-2#TRPBF equivalent, key selection criteria include its TSOT-23-8 package, EN active-low output capable of driving external P-channel MOSFETs, configurable turn-off timer via TMR pin, ±25kV HBM ESD protection on PB, and compatibility with 0°C to 70°C industrial temperature range.
Technical Context
The LTC2955CTS8-2#TRPBF implements a dual-input power control architecture: debounced pushbutton (PB) and monitored supply (ON) trigger clean enable transitions, while KILL provides microprocessor-initiated or voltage-monitor-initiated immediate shutdown. Its internal LDO powers logic and pull-up circuitry, enabling EN to be pulled high to VIN through a 900kΩ internal resistor in off-state.
It integrates 32ms hardware debounce on PB/ON inputs, 512ms KILL blanking after turn-on, and 1s EN lockout after turn-off - all critical for stable regulator handshaking and µP power-state coordination. The TSOT-23-8 variant fixes SEL internally to GND, disabling ON-falling-edge turn-off and simplifying layout versus DFN versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.5V to 36V - supports wide-input industrial and automotive supplies without external regulation. |
| IIN (Quiescent) | 1.2µA typical - enables multi-year battery life in always-on monitoring applications. |
| PB Input Range | ±36V - withstands load-dump transients and reverse-battery conditions without external protection. |
| ESD (HBM) | ±25kV on PB pin - eliminates need for external TVS diodes in handheld and vehicle-mounted designs. |
| EN Output Type | Active-low open-drain (LTC2955-2) - directly drives gate of external P-channel MOSFET for high-side power switching. |
| TMR Timer Range | Configurable 5.8–17.2ms additional turn-off delay (CTMR = 2200pF) - enables fail-safe forced shutdown if µP fails to respond to INT. |
| Operating Temp | 0°C to 70°C - qualified for commercial and extended industrial ambient environments. |
| Package | 8-Lead TSOT-23 - compact footprint compatible with high-density PCB layouts; no exposed pad. |
Pinout & Package
Package: 8-Lead Plastic TSOT-23 (3mm × 1.75mm), RoHS-compliant, lead-free finish. Thermal resistance θJA = 195°C/W. No exposed pad; all pins accessible on perimeter.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INT) | Open-drain interrupt output | Signals PB press or ON event to µP; requires external pull-up; minimum 32ms pulse width ensures reliable edge detection. |
| 2 (EN) | Inverted enable output (active-low) | Drives P-MOSFET gate or active-low SHDN pin; pulled high to VIN (900kΩ) when released; sinks current when asserted low. |
| 3 (VIN) | Main power supply input | Accepts 1.5V–36V; bypass with 10nF low-ESR capacitor; internal LDO derives bias for logic and pull-ups. |
| 4 (PB) | Debounced pushbutton input | Active-low; 900kΩ internal pull-up to ~5.2V LDO; tolerates ±36V swings and ±25kV HBM ESD. |
| 5 (ON) | Supply monitor input | Detects rising edge for automatic turn-on; threshold 0.8V; falling edge ignored in TSOT-23 (SEL fixed to GND). |
| 6 (KILL) | Microprocessor kill input | Active-low; releases EN immediately when pulled <0.8V; also usable as voltage monitor input (e.g., battery low detection). |
| 7 (TMR) | Turn-off timer configuration | Capacitor-to-GND sets additional forced-shutdown delay; open-circuit defaults to 64ms total turn-off time. |
| 8 (GND) | Device ground reference | Single ground connection; must be low-impedance path to system ground plane for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Turn-On via Voltage Monitor | ON pin rising edge triggers EN assertion after 32ms debounce - enables plug-and-play power-up when wall adapter or battery is connected. |
| Fail-Safe Forced Power-Down | Holding PB low >64ms + tTMR forces EN release even if µP hangs - prevents unresponsive system lockup in field-deployed equipment. |
| µP Shutdown Coordination | INT output gives ≥32ms warning before power removal; KILL blanking (512ms) and EN lockout (1s) ensure deterministic power-state transitions. |
| High-Voltage PB Interface | ±36V input tolerance and ±25kV HBM rating eliminate external protection components - reduces BOM count and board area in harsh environments. |
| Low-Leakage EN Output | 900kΩ internal pull-up to VIN enables direct drive of P-MOSFET gate with <1.2µA standby current - avoids external pull-up resistor and leakage path. |
Applications
| Portable Medical Instrumentation | Automotive Telematics Module |
|---|---|
|
Use Scenario: Handheld blood glucose meter powered by coin cell, requiring single-button power-on and auto-shutdown after 2 minutes of inactivity. IC Role / Device Role / Timing Role: LTC2955CTS8-2#TRPBF monitors button press and battery voltage; asserts EN to enable DC/DC converter; uses KILL to initiate controlled shutdown upon µP command. Use Value: 1.2µA quiescent current extends battery life beyond 3 years; ±25kV ESD protection ensures reliability during frequent handling in clinical settings. |
Use Scenario: GPS-based fleet tracking unit mounted in vehicle cabin, powered from 12V battery with ignition-sense input. IC Role / Device Role / Timing Role: LTC2955CTS8-2#TRPBF uses ON pin to detect ignition-on (via resistive divider), turns on main power rail; PB enables manual reset; KILL responds to low-battery signal. Use Value: 1.5V–36V VIN range accommodates cold-crank (6V) and load-dump (40V) events; ±36V PB tolerance prevents latch-up during jump-start scenarios. |
| Industrial Data Logger | Smart Sensor Node |
|
Use Scenario: Battery-operated environmental sensor logging temperature/humidity every 10 seconds, requiring ultra-low-power wake-on-button and graceful shutdown. IC Role / Device Role / Timing Role: LTC2955CTS8-2#TRPBF controls power to MCU and sensors; INT alerts µP of button press; TMR capacitor configures 5s forced-off timeout for maintenance access. Use Value: 32ms hardware debounce eliminates false triggers from mechanical switch bounce; 512ms KILL blanking guarantees regulator stabilization before µP boot. |
Use Scenario: Wireless IoT node powered by Li-ion battery, needing pushbutton wake-up and battery-voltage-triggered shutdown to prevent deep discharge. IC Role / Device Role / Timing Role: LTC2955CTS8-2#TRPBF uses KILL pin as battery monitor (via resistive divider); ON pin unused; EN drives P-MOSFET to isolate battery during sleep. Use Value: Internal 900kΩ EN pull-up eliminates external component; 0.8V KILL threshold allows precise 3.0V battery cutoff with minimal resistor network. |
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 only; no PB input, no INT output, no TMR timer; active-high RESET output. | Suitable only for simple supply-voltage supervision; cannot replace pushbutton interface or coordinated shutdown sequencing. | Select only if application requires basic undervoltage detection without user interaction or µP coordination. |
| MAX16054ATA+T | Wider temp range (–40°C to 125°C); includes watchdog timer; no integrated PB debounce or TMR-configurable shutdown; EN is push-pull, not open-drain. | Requires external RC network for PB debouncing; lacks automatic ON-pin turn-on and KILL-blanking timing; less suited for battery-constrained designs (IQ = 8µA). | Prefer for high-temp automotive under-hood use where watchdog functionality is needed, but expect added complexity for pushbutton support. |
Compared with TPS3808G33DBVR and MAX16054ATA+T, the LTC2955CTS8-2#TRPBF uniquely integrates hardware-debounced PB input, ON-pin voltage monitoring, INT signaling, and TMR-configurable forced shutdown in an 8-pin TSOT-23 - delivering complete, low-component-count power sequencing for portable and embedded systems.
Availability
LTC2955CTS8-2#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, automotive telematics, industrial data loggers, and smart sensor nodes requiring stable component supply across commercial and extended temperature ranges.
Supply support for LTC2955CTS8-2#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2955 series was designed specifically for robust, low-power system power management in space-constrained, battery-operated, and harsh-environment applications - emphasizing reliability, ESD resilience, and seamless µP coordination.
FAQ
What is the function of the TMR pin on the LTC2955CTS8-2#TRPBF?
The TMR pin on the LTC2955CTS8-2#TRPBF sets the additional forced turn-off delay beyond the base 64ms. Connecting a capacitor from TMR to GND configures a programmable timer (5.8–17.2ms typical with 2200pF); leaving it open defaults to 64ms total turn-off time. This feature ensures system power is cut even if the microprocessor fails to respond to the INT signal, enhancing fault tolerance in the LTC2955CTS8-2#TRPBF design.
How does the LTC2955CTS8-2#TRPBF differ from the LTC2955CTS8-1#TRPBF?
The LTC2955CTS8-2#TRPBF features an active-low EN output optimized to drive the gate of an external P-channel MOSFET, pulling high to VIN via a 900kΩ internal resistor when released. In contrast, the LTC2955CTS8-1#TRPBF has an active-high EN output with 2µA internal pull-up to an internal LDO (~4.3V). Both share identical PB, ON, KILL, and INT functionality, but the polarity and drive capability of EN make them non-interchangeable without circuit revision.
Can the ON pin of the LTC2955CTS8-2#TRPBF be used for automatic turn-off?
No - the ON pin of the LTC2955CTS8-2#TRPBF (TSOT-23 package) cannot trigger automatic turn-off. The SEL pin is internally tied to GND in this package, disabling ON-falling-edge detection. Only the PB pin and KILL input can initiate turn-off. Automatic turn-off via ON pin is exclusive to the 10-lead DFN variants (e.g., LTC2955DDB-2) where SEL is externally controllable.
What is the maximum voltage the PB pin of the LTC2955CTS8-2#TRPBF can tolerate?
The PB pin of the LTC2955CTS8-2#TRPBF is rated for ±36V absolute maximum input voltage, per the Absolute Maximum Ratings table. This allows direct connection to automotive battery rails or industrial supplies without external clamping, and it survives ±25kV HBM ESD events without latch-up or damage - a key reliability feature confirmed in the LTC2955CTS8-2#TRPBF datasheet.
Does the LTC2955CTS8-2#TRPBF require external components for basic operation?
Yes - minimal external components are required: a 0.1µF bypass capacitor on VIN, a pull-up resistor on INT (typically 10kΩ to system VCC), and optionally a capacitor on TMR for adjustable forced shutdown. The PB pin requires only a momentary switch to GND; ON and KILL need resistive dividers only if used as voltage monitors. No external debounce RC or level-shifters are needed due to the LTC2955CTS8-2#TRPBF's integrated robust input structure.
LTC2955CTS8-2#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:
- ±36V
- Voltage - Supply:
- 1.5V ~ 36V
- Current - Supply:
- 1.2 µA
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2955CTS8-2#TRPBF FAQ
1.How can I place an order for LTC2955CTS8-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2955CTS8-2#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 LTC2955CTS8-2#TRPBF reliable?
The price and inventory of LTC2955CTS8-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2955CTS8-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2955CTS8-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2955CTS8-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2955CTS8-2#TRPBF?
LTC2955CTS8-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2955CTS8-2#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 LTC2955CTS8-2#TRPBF?
For technical support, including LTC2955CTS8-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2955CTS8-2#TRPBF requirements.
6.How does Aetrix verify that LTC2955CTS8-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2955CTS8-2#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 LTC2955CTS8-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2955CTS8-2#TRPBF?
All LTC2955CTS8-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2955CTS8-2#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 LTC2955CTS8-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC2955CTS8-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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