LTC2955ITS8-2#TRPBF - Pushbutton On/Off Controller | Analog Devices
MPN: LTC2955ITS8-2#TRPBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.9 | $4.90 |
| 10 | $4.41 | $44.10 |
| 100 | $3.93 | $393.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $3.03 | $3,030.00 |
LTC2955ITS8-2#TRPBF Overview
A supervisory circuit (also called a power supply controller or power management controller) is an IC that monitors and controls the power rails of an electronic system. Pushbutton on/off controllers form a sub-category used to replace mechanical power switches with a momentary pushbutton while offering clean, debounced, sequencing-aware enable signals. Within the broader power-management IC hierarchy, supervisory circuits sit alongside voltage regulators and supervisors/reset ICs, providing the human-machine interface between the user and the power tree.
Key features of the LTC2955 include automatic turn-on (the -2 variant enables the system when KILL is asserted, while the -1 variant disables it), a user-configurable power-on reset / debounce timer, wide 1.5 V–36 V VIN tolerance, integrated pushbutton debounce, and a polarity-independent pushbutton interface. According to the manufacturer datasheet 2955fa, the device provides a clean enable output via an open-drain pin capable of driving an external P-FET or PNP transistor, plus an INT output that can wake or interrupt the system microcontroller.
Typical applications include handheld instruments, portable medical devices, notebook and tablet power sequencing, automotive telematics boxes, and industrial handheld terminals. The wide VIN range (1.5 V–36 V) allows the LTC2955 to monitor 1-cell Li-Ion, 2-cell Li-Ion, 12 V lead-acid, and even 24 V industrial buses directly without additional level translation.
When designing with this part, place the KILL pull-up and the enable gate pull-up as close as possible to the IC, and add a small RC on the PB pin if the mechanical switch has high bounce. The INT pin is open-drain and requires a pull-up resistor to the logic supply of the host. According to Analog Devices documentation, the -2 polarity means the system powers up automatically on KILL assertion, which is preferred for systems that must start without user input (such as always-on sensor nodes).
Drop-in alternatives for LTC2955ITS8-2#TRPBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC2955ITS8-2#TRPBF (same form factor and footprint) — differing in Operating Temperature Range, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2955ITS8-2#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2955ITS8-2#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2955CTS8-2#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2955ITS8-2
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →LTC2955ITS8-1#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2955ITS8-2#TRPBF Specifications
| Function | Pushbutton On/Off Controller with Automatic Turn-On |
| Polarity Variant | -2 (Automatic Turn-On, Enable on KILL de-assertion) |
| Input Voltage Range (VIN) | 1.5 V to 36 V |
| Supply Current (Quiescent) | 1.2 µA typical |
| Pushbutton Input (PB) | Debounced, polarity-independent |
| Supply Monitor Input (SUP) | Yes, with internal threshold and adjustable input |
| INT Output | Open-drain, active-low interrupt to host |
| Enable Output (EN) | Active-high, open-drain capable of driving external P-FET |
| KILL Input | Active-high logic input to forcibly disable system |
| Turn-On Debounce / Reset Timer | User-configurable via external capacitor |
| Operating Temperature Range | -40 °C to +85 °C (Industrial) |
| Package | TSOT-23-8 (TS8) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (Unlimited) |
| RoHS Status | Compliant |
| Lead-Free Finish | Yes (PBF suffix) |
| Packaging | Tape & Reel (TRPBF suffix) |
LTC2955ITS8-2#TRPBF Pin Configuration
| Pin 1 | VIN — Supply voltage input (1.5 V to 36 V) |
| Pin 2 | SUP — Supply monitor input / adjustable threshold |
| Pin 3 | PB — Pushbutton input (debounced, polarity-independent) |
| Pin 4 | KILL — Active-high logic input to disable system (-2: turn-on on de-assertion) |
| Pin 5 | EN — Open-drain enable output to drive external P-FET gate |
| Pin 6 | INT — Open-drain interrupt output (active-low) to host |
| Pin 7 | RT — Reset / debounce timer capacitor connection |
| Pin 8 | GND — Ground reference |
Typical Applications
LTC2955ITS8-2#TRPBF is suitable for 6 applications: Handheld Battery-Powered Instruments, Notebook and Tablet Power Sequencing, Industrial Handheld Terminals, Portable Medical Devices, Automotive Infotainment Modules, IoT Sensor Nodes and Edge Devices.
Handheld Battery-Powered Instruments
The LTC2955ITS8-2#TRPBF is well-suited to handheld battery-powered instruments because its 1.2 µA quiescent current places negligible load on the cell during shelf and standby states, while its 1.5 V–36 V VIN tolerates 1-cell, 2-cell, and even multi-cell Li-Ion packs without level shifting. The -2 automatic-turn-on polarity wakes the system the moment the user releases the pushbutton or the host asserts KILL, eliminating the cold-boot delay of an always-on MCU. The INT pin wakes the host from deep sleep on a debounced pushbutton press, and the EN pin drives a P-FET to switch the main rail. With the TSOT-23-8 package consuming only 9 mm² of board area, this controller fits inside handheld multimeters, barcode scanners, and portable diagnostic tools where PCB real estate is at a premium.
Recommended
Notebook and Tablet Power Sequencing
In notebook and tablet designs, the LTC2955ITS8-2#TRPBF provides clean, debounced power-on/off control without the noise and bounce of a mechanical switch wired directly to the regulator. The open-drain EN pin switches an external P-FET, allowing the main 12 V or 19 V DC input to be gated cleanly into the downstream buck regulators (such as the LT8645SEV#PBF or LT8640IUDC-1#PBF). The INT pin signals the embedded controller on pushbutton and low-supply events, while the configurable reset/debounce timer prevents spurious wake-ups from switch bounce or short presses. Its wide 1.5 V–36 V VIN range also makes it directly compatible with USB-C PD 20 V inputs without additional protection circuitry.
Recommended
Industrial Handheld Terminals
Industrial handheld terminals such as barcode scanners, RFID readers, and ruggedized PDAs benefit from the LTC2955ITS8-2#TRPBF because its industrial -40 °C to +85 °C operating range handles outdoor and factory-floor temperature swings without derating. The wide 1.5 V–36 V VIN lets the controller interface directly to 24 V industrial bus supplies or to multi-cell Li-Ion packs, and its 1.2 µA quiescent current preserves battery life across long shift cycles. The automatic turn-on (-2) polarity is preferred for terminals that must wake on insertion into a dock or on power-supply detection, while the open-drain INT pin provides a clean interrupt to the application processor on a pushbutton press. The TSOT-23-8 package withstands the high-vibration environments typical of factory and warehouse use.
Recommended
Portable Medical Devices
For portable medical devices such as glucose meters, pulse oximeters, and ambulatory infusion pumps, the LTC2955ITS8-2#TRPBF provides a reliable, debounced power-on interface that meets the stringent reliability expectations of medical electronics. The 1.2 µA quiescent current preserves the battery during multi-year shelf life, and the industrial -40 °C to +85 °C range handles cold-storage and body-temperature environments. The -2 polarity enables automatic turn-on when the device is removed from its charging cradle (KILL de-assertion), while the open-drain EN pin drives a P-FET to switch the medical-grade sensor rail. RoHS compliance and lead-free finish meet medical device environmental directives.
Recommended
Automotive Infotainment Modules
Although the LTC2955ITS8-2#TRPBF is industrial-grade rather than AEC-Q100 qualified, it is widely used in non-safety-critical automotive infotainment modules such as head-unit accessory ports, rear-seat entertainment displays, and telematics boxes. Its wide 1.5 V–36 V VIN tolerates 12 V automotive load-dump transients (with appropriate external TVS protection), and the TSOT-23-8 package fits the compact form factor of dashboard-mounted electronics. The automatic turn-on polarity is preferred for always-connected telematics that must boot when ignition is applied, while the INT pin wakes the CAN-connected host processor on user input. For AEC-Q100 critical safety applications, design engineers should source the AEC-Q100 qualified LTC2955 variant.
Recommended
IoT Sensor Nodes and Edge Devices
IoT sensor nodes and edge devices benefit from the LTC2955ITS8-2#TRPBF's combination of 1.2 µA quiescent current, debounced pushbutton input, and automatic turn-on capability. Wireless sensor nodes that wake on user button press or on supply-rail connection can use the INT pin to wake the host MCU from deep sleep, then use the EN pin to gate power to the radio (such as a sub-GHz or BLE transceiver). The wide 1.5 V–36 V VIN range allows direct connection to solar panels, battery packs, and 24 V industrial buses. Combined with companion regulators like the LT8364EMSE boost or LT8606EDC#TRPBF buck, the LTC2955 enables multi-year battery-life sensor nodes with reliable user-interface control.
Recommended
Recommended Products Summary
Engineering reference data for LTC2955ITS8-2#TRPBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2955ITS8-2#TRMPBF | LTC2955ITS8-2#PBF | LTC2955CTS8-2#TRPBF | LTC2955ITS8-2 | LTC2955ITS8-1#TRMPBF |
|---|---|---|---|---|---|---|
| Package | TSOT-23-8 (TS8) | TSOT-23-8 - same | TSOT-23-8 - same | TSOT-23-8 - same | TSOT-23-8 - same | TSOT-23-8 - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Polarity Variant | -2 (Auto Turn-On) | -2 (Auto Turn-On) | -2 (Auto Turn-On) | -2 (Auto Turn-On) | -2 (Auto Turn-On) | -1 (Auto Turn-Off) |
| Input Voltage Range | 1.5 V to 36 V | 1.5 V to 36 V | 1.5 V to 36 V | 1.5 V to 36 V | 1.5 V to 36 V | 1.5 V to 36 V |
| Quiescent Current | 1.2 µA | 1.2 µA | 1.2 µA | 1.2 µA | 1.2 µA | 1.2 µA |
| Operating Temperature | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C | -40 °C to +85 °C | 0 °C to +70 °C (Commercial) | -40 °C to +85 °C | -40 °C to +85 °C |
| Pushbutton Input | Yes, debounced | Yes | Yes | Yes | Yes | Yes |
| Packaging Format | Tape & Reel (TRPBF) | Tape & Reel (TRMPBF) | Tube (PBF) | Tape & Reel | Bulk / cut tape | Tape & Reel |
Key Differentiators
- Industry-standard micropower pushbutton controller with 1.2 µA Iq (vs LTC2955ITS8-1#TRMPBF)
- Wide 1.5 V to 36 V input range eliminates external level shifters (vs LTC2955IDDB-1 (obsolete 10-DFN variant))
- Industrial -40 °C to +85 °C temperature grade for harsh environments (vs LTC2955CTS8-2#TRPBF)
Design Notes
Place a 0.1 µF ceramic bypass capacitor as close as possible to the VIN pin (pin 1) to suppress high-frequency noise from the upstream supply rail. For applications with long input traces or noisy 12 V/24 V buses, add a 10 µF bulk capacitor at the VIN pin and a TVS diode (such as SMAJ33CA) to clamp load-dump transients. Keep the SUP pin trace short to prevent supply-monitor threshold drift; route it directly to the supply rail being monitored with minimal parasitic impedance.
Do not leave the INT pin (pin 6) floating - it is an open-drain output and requires an external pull-up resistor (typically 10 kΩ to 100 kΩ) to the host logic supply. Failing to pull up INT can cause the host to see spurious interrupts or miss pushbutton events entirely. The KILL pin (pin 4) is polarity-sensitive for the -2 variant: the system turns ON when KILL is de-asserted (low) and turns OFF when KILL is asserted (high). Ensure the KILL signal sequencing matches the -2 logic to avoid unexpected power cycling during firmware bring-up.
The PB input is debounced internally but a low-pass RC filter (10 kΩ + 100 nF) on the PB pin improves noise immunity in industrial environments with long switch-cable harnesses. Keep the RT capacitor (pin 7) trace short and route it away from switching node edges to prevent injected noise from altering the debounce time constant. For wide-trace PCB layouts, add a ground guard ring around the PB pin to reject capacitive coupling from adjacent high-voltage or switching signals.
Compliance Information
RoHS and lead-free per the #TRPBF / #PBF suffix designators. Not AEC-Q100 qualified - the standard part targets industrial, consumer, and portable medical designs. For automotive safety-critical applications, consult Analog Devices for the AEC-Q100 qualified variant.
