LTC2955ITS8-2 - Pushbutton On/Off Controller with Auto Turn-On | Analog Devices
料号： LTC2955ITS8-2 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.42 | $4.42 |
| 10 | $3.98 | $39.80 |
| 100 | $3.51 | $351.00 |
| 500 | $3.24 | $1,620.00 |
| 1,000 | $3.03 | $3,030.00 |
| 3,000 | $2.85 | $8,550.00 |
LTC2955ITS8-2 概述
A pushbutton on/off controller is a type of power management IC that sits between a mechanical pushbutton and the system's main regulator or load switch. It belongs to the supervisory and reset IC family within the broader category of power management ICs. These devices debounce the pushbutton, generate a clean logic-level enable signal, and provide graceful power-up/power-down sequencing in battery-powered and line-powered systems. The LTC2955 specifically adds an automatic turn-on mode for systems that must power up without a button press.
Key features of the LTC2955ITS8-2 include a wide 1.6 V to 36 V operating range, 1.2 µA typical quiescent current, an open-drain INT (interrupt) output that signals a button press or low-voltage event, and a KILL (power kill) input that lets the host force shutdown. The TSOT-23-8 package is suitable for handheld and space-constrained designs, and the part is specified from -40 °C to +85 °C industrial temperature range. The "-2" suffix denotes the active-high enable output polarity variant of the LTC2955 family.
Architecturally, the LTC2955 uses a precision bandgap reference, comparators, and a timer block to generate the debounce and turn-off delays. The user programs the debounce time via an external capacitor on the PB/INT pin, and the turn-off time via a capacitor on the tOFF pin. The wide VIN range lets the part interface directly with 1-cell lithium, 2-3 cell alkaline, or industrial 24 V rails without additional level shifting.
Typical applications include handheld test instruments, portable medical devices, battery-powered IoT nodes, industrial HMI panels, and any system that needs a soft on/off button instead of a hard mechanical switch. The -2 variant is the right choice when the downstream regulator or load switch expects an active-high enable signal.
When designing with the LTC2955ITS8-2, choose pull-up resistors sized for the system leakage budget and place the tOFF and tDEB capacitors close to the IC to avoid noise injection. The KILL pin should be tied to GND through a resistor if unused, and the INT pin requires a pull-up to the logic rail of the host processor.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet, organized for engineers who need to evaluate, source, and integrate the LTC2955ITS8-2 quickly.
直接替换替代料： LTC2955ITS8-2 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LTC2955ITS8-2 （相同外形与封装尺寸） ——差异在于 Operating Temperature Range, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
LTC2955CTS8-2
✅ 直接替换📋 参考替代料（不在目录中）
LTC2955ITS8-2#TRMPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC2955ITS8-1
✅ 直接替换📋 参考替代料（不在目录中）
LTC2955CTS8-2#TRMPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC2950ITS8-2
✅ 直接替换📋 参考替代料（不在目录中）
LTC2955ITS8-2 规格参数
| Manufacturer | Analog Devices |
| 功能 | Pushbutton On/Off Controller with Automatic Turn-On |
| Input Voltage Range (VCC) | 1.6 V to 36 V |
| Typical Quiescent Current | 1.2 µA |
| Enable Output Polarity | Active-High (-2 suffix variant) |
| Pushbutton Debounce Time | Programmable via external capacitor |
| Turn-Off Time | Programmable via external capacitor |
| INT (Interrupt) Output | Open-drain, signals button press or low supply |
| KILL (Power Kill) Input | Active-low, allows host to force shutdown |
| 工作温度范围 | -40 °C to +85 °C |
| 封装 | TSOT-23-8 (TS8) |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 (unlimited) |
| RoHS 状态 | Compliant (#PBF suffix) |
| Lead-Free | Yes |
| Duty Cycle | Continuous |
| 引脚数 | 8 |
| Recommended for New Designs | Yes (per ADI product page) |
LTC2955ITS8-2 引脚配置
| 引脚 1 | VCC — Supply input, 1.6 V to 36 V |
| 引脚 2 | EN — Enable output, active-high (-2 suffix) |
| 引脚 3 | INT — Interrupt output, open-drain |
| 引脚 4 | PB — Pushbutton input, also debounce timer cap |
| 引脚 5 | GND — Ground |
| 引脚 6 | tOFF — Turn-off timer capacitor |
| 引脚 7 | KILL — Power kill input, active-low |
| 引脚 8 | tDEB — Debounce timer capacitor |
典型应用
LTC2955ITS8-2 适用于 6 应用s: Handheld Test & Measurement Instruments, Portable Medical Devices, Battery-Powered IoT Sensor Nodes, Industrial HMI Panels, Automotive Dashcam / Infotainment Modules, Networking Switches & Routers.
Handheld Test & Measurement Instruments
The LTC2955ITS8-2 fits handheld DMMs and oscilloscopes because its 1.2 µA quiescent current extends battery life on 9 V alkaline or 18650 Li-ion packs, and its 1.6 V to 36 V VCC range accepts the regulator output directly without level shifting. The active-high enable output (-2 suffix) drives the downstream buck regulator or load switch cleanly. Place a 100 nF decoupling capacitor within 5 mm of VCC and use a 1 MΩ pull-up on INT for reliable interrupt signaling to the MCU.
推荐
Portable Medical Devices
Patient monitors and portable infusion pumps benefit from the LTC2955ITS8-2's deterministic pushbutton shutdown and KILL input, which lets the host processor force a safe power-down sequence. The 1.2 µA standby drain preserves battery life between patient sessions, and the -40 °C to +85 °C industrial temperature range supports cold-chain logistics and ambulance environments. The active-high EN drives the isolation barrier enable so the system cannot power up spuriously from a noisy switch bounce.
推荐
Battery-Powered IoT Sensor Nodes
Wireless sensor nodes use the LTC2955ITS8-2 to provide a clean power-on from a coin cell or LiSOCl2 battery without the parasitic drain of a latching mechanical switch. The wide 1.6 V to 36 V VCC range means the same board accepts a 3 V coin cell, a 3.7 V Li-ion, or a 12 V solar-battery hybrid with no hardware change. The AUTO turn-on feature wakes the node automatically when the battery is inserted or the solar charger starts up.
推荐
Industrial HMI Panels
Industrial human-machine interface panels use the LTC2955ITS8-2 to debounce panel-mount tactile switches that would otherwise generate multiple interrupts from a single press. The pushbutton debounce timer is user-programmable via the tDEB capacitor, allowing 5 ms to 500 ms hold times for intentional long-press shutdown. The INT open-drain output interfaces cleanly with 3.3 V or 5 V host MCUs regardless of VCC voltage, simplifying multi-rail system design.
推荐
Automotive Dashcam / Infotainment Modules
Dashcams and aftermarket infotainment modules benefit from the LTC2955ITS8-2's ability to power up automatically when the ignition line goes high (AUTO turn-on mode) and to shut down gracefully via the KILL input after the engine is off. The 1.6 V to 36 V input handles 12 V automotive cranking transients without external protection. The TSOT-23-8 package is small enough to fit behind the head unit's existing switch cluster.
推荐
Networking Switches & Routers
Small-form-factor networking equipment uses the LTC2955ITS8-2 to provide a clean reset button function that the host CPU can also initiate via the KILL input. The pushbutton debounce prevents nuisance resets from vibration or accidental contact, and the open-drain INT output allows multiple interrupt sources to share one MCU pin. The 1.2 µA standby current is negligible compared to the switch's main power supply.
推荐
推荐产品汇总
工程参考数据： LTC2955ITS8-2 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LTC2955CTS8-2 | LTC2955ITS8-2#TRMPBF | LTC2955ITS8-1 | LTC2955CTS8-2#TRMPBF | LTC2950ITS8-2 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TSOT-23-8 (TS8) | TSOT-23-8 (TS8) - same | TSOT-23-8 (TS8) - same | TSOT-23-8 (TS8) - same | TSOT-23-8 (TS8) - same | TSOT-23-8 (TS8) - same |
| Input Voltage Range | 1.6 V to 36 V | 1.6 V to 36 V | 1.6 V to 36 V | 1.6 V to 36 V | 1.6 V to 36 V | 2.7 V to 26.4 V (narrower) |
| Quiescent Current | 1.2 µA typical | 1.2 µA typical | 1.2 µA typical | 1.2 µA typical | 1.2 µA typical | 10 µA typical (higher) |
| Enable Polarity | Active-High (-2 suffix) | Active-High (-2 suffix) | Active-High (-2 suffix) | Active-Low (-1 suffix) | Active-High (-2 suffix) | Active-High (-2 suffix) |
| Automatic Turn-On | Yes | Yes | Yes | Yes | Yes | No |
| KILL Input | Yes | Yes | Yes | Yes | Yes | No |
| Operating Temperature | -40 °C to +85 °C (I-grade) | 0 °C to +70 °C (C-grade) | -40 °C to +85 °C (I-grade) | -40 °C to +85 °C (I-grade) | 0 °C to +70 °C (C-grade) | -40 °C to +85 °C |
关键差异点
- Wide 1.6 V to 36 V VCC input range （对比 LTC2950ITS8-2)
- Lower 1.2 µA typical quiescent current （对比 LTC2950ITS8-2)
- AUTO turn-on mode and KILL input （对比 LTC2950ITS8-2)
设计说明
Place a 100 nF X7R ceramic bypass capacitor within 5 mm of the VCC pin (pin 1) to suppress supply transients that could trigger a false INT or KILL event. The 1.6 V to 36 V input range is wide, but at cold-cranking transients on a 12 V automotive rail the local decoupling must hold VCC above the 1.6 V UVLO threshold. For battery-powered designs, add a 10 µF bulk capacitor on VCC to handle the inrush of downstream regulators enabled by EN.
Do not leave the KILL pin floating. If the host does not drive KILL, tie it to GND through a 100 kΩ resistor to prevent the input from floating into an indeterminate state and causing spurious shutdowns. The INT pin is open-drain and MUST be pulled up to the host's logic rail (typically 3.3 V or 5 V) with a 10 kΩ to 100 kΩ resistor; without a pull-up, the interrupt signal will never reach the MCU.
Route the PB and tDEB traces away from switching nodes and inductors to avoid capacitive coupling that could cause false pushbutton events. Keep the tOFF capacitor trace short - long traces add parasitic capacitance that lengthens the turn-off time beyond the datasheet calculation. The exposed thermal pad (if present on the package variant) should be soldered to a copper pour to improve thermal performance, although the part itself dissipates negligible power.
合规信息
RoHS and lead-free per the #PBF suffix and ADI product page. Not AEC-Q100 qualified - the part is intended for industrial and consumer applications. Halogen-free status not stated in the verified web data; flagged as unknown.
