TPS22991ICNRAAR - 2.7A, 28mΩ Load Switch | TI
料号： TPS22991ICNRAAR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.55 | $5.50 |
| 100 | $0.44 | $44.00 |
| 500 | $0.36 | $180.00 |
| 1,000 | $0.29 | $290.00 |
| 3,000 | $0.24 | $720.00 |
TPS22991ICNRAAR 概述
A load switch is a power management IC that sits between a power rail and its load, acting as an electronically controlled switch. In the system hierarchy, a load switch is a type of power distribution switch, itself a subcategory of power MOSFET driver / power management IC. Load switches allow processors, PMICs, or logic circuits to connect and disconnect sub-system power rails, control power-up sequencing, and limit inrush current during capacitor charging at turn-on.
Key features of the TPS22991I family include the extremely small plastic 4-pin UQFN package, controlled slew rate during turn-on that limits inrush current, low shutdown leakage current that preserves battery life in portable designs, and an on/off input (EN) capable of interfacing directly with low-voltage GPIO control signals. The switch element is an N-channel MOSFET that supports a maximum continuous current of 2.7A in this variant.
Technically, the device integrates the N-channel pass MOSFET, its charge-pump-style gate drive, and slew-rate control circuitry into the tiny 0.85 mm x 0.75 mm footprint. The controlled rise time avoids the voltage droop and ringing that occur when an uncontrolled switch charges large downstream capacitance. The low shutdown leakage specification is particularly valuable in always-on and battery-backed designs where even microamps matter.
Typical applications include power-rail gating in smartphones, tablets and wearables, peripheral power switching in industrial sensors and IoT modules, battery disconnect functions in portable instruments, and power sequencing for processors, RF front ends and displays. The -55°C to +125°C range supports aerospace and extreme-environment industrial designs.
A key design consideration: the 4-pin UQFN-HR pinout is not the generic IN-OUT-GND-EN arrangement used by most small load switches, so designers must verify the specific pin assignment in the manufacturer datasheet before drop-in substitution; TI's E2E forum has documented this special pinout.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： TPS22991ICNRAAR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
TPS22990
✅ 直接替换📋 参考替代料（不在目录中）
TPS22991ICNRR
✅ 直接替换📋 参考替代料（不在目录中）
TPS22991CNR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS22991ICNRAAR 最大额定值与电气特性
| Product Type | Single-channel N-channel load switch |
| 输入电压范围 | 1.0 V to 5.5 V |
| Maximum Continuous Current | 2.7 A |
| On-Resistance (RON) | 28 mOhm |
| Switch Configuration | 1:1 (N-channel MOSFET) |
| Control Input | On/Off (EN), low-voltage logic compatible |
| Slew Rate | Controlled turn-on slew rate |
| Shutdown Leakage | Low (per datasheet) |
| 工作温度范围 | -55 C to +125 C |
| 封装 | 4-UQFN-HR (0.85 mm x 0.75 mm, 0.4 mm pitch) |
| 安装类型 | Surface Mount |
| Number of Channels | 1 |
| Output Discharge | Optional (family feature per TI product page) |
| RoHS 状态 | Compliant (per JLCPCB listing) |
| Family Variants | TPS22991 (5V, 3A, 25 mOhm); TPS22991I (5.5V, 2.7A, 28 mOhm) |
| Series | TPS22991I small plastic load switch |
TPS22991ICNRAAR 4-uqfn-hr (0.85 mm x 0.75 mm, 0.4 mm pitch) 引脚配置指南
TPS22991ICNRAAR（4-uqfn-hr (0.85 mm x 0.75 mm, 0.4 mm pitch) 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： TPS22991ICNRAAR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
TPS22991ICNRAAR 适用于 6 应用s: Smartphone and Wearable Power Rail Gating, IoT Module and Sensor Power Sequencing, Aerospace and Extreme-Temperature Industrial Designs, Battery Disconnect and Protection Switching, Peripheral Power Switching in Portable Instruments, Processor and RF Power-Up Sequencing.
Smartphone and Wearable Power Rail Gating
The TPS22991ICNRAAR is purpose-built for rail gating in smartphones, tablets, and wearables, where its 0.85 mm x 0.75 mm UQFN-HR footprint is among the smallest load-switch packages on the market. The 28 mOhm on-resistance keeps series voltage drop negligible on a 3.3V or 1.8V rail even at ampere-class peak loads, and the 2.7A rating covers cameras, modems, and display subsystems. The controlled slew rate limits inrush when charging large bulk capacitors at peripheral turn-on, preventing rail droop on shared battery supplies. Low shutdown leakage preserves battery life during the long periods when sub-systems remain disconnected, which is the dominant lifetime consideration in always-on wearable designs.
推荐
IoT Module and Sensor Power Sequencing
In battery-powered IoT nodes and industrial sensors, the TPS22991ICNRAAR switches power to radio modules, microcontrollers, and sensor front ends from a 1.0V to 5.5V input. Its on/off input interfaces directly with low-voltage GPIO signals, allowing an ultra-low-power MCU to gate entire sub-systems between duty cycles. The controlled turn-on slew rate prevents the supply sag that would otherwise reset the MCU when a capacitive load switches on. Rated -55C to +125C, the device also suits outdoor and cold-chain sensor deployments. Per the TI datasheet, the integrated N-channel MOSFET with soft-start eliminates discrete MOSFET-plus-driver solutions, saving board area and BOM cost in high-volume node designs.
推荐
Aerospace and Extreme-Temperature Industrial Designs
The -55C to +125C characterization range of the TPS22991I variant makes the ICNRAAR appropriate for avionics accessories, down-hole instrumentation, and cold-environment industrial equipment where standard -40C load switches are insufficient. The small plastic UQFN package keeps mass and board area minimal for constrained enclosures, while 28 mOhm RON limits self-heating: Estimated at a 2A continuous load, conduction loss is I2xR = 4 x 0.028 = 112 mW, a modest dissipation for the tiny package when paired with adequate copper. Low shutdown leakage supports the battery-backed keep-alive circuits common in flight hardware and remote telemetry installations.
推荐
Battery Disconnect and Protection Switching
The TPS22991ICNRAAR can serve as a low-loss disconnect between a single-cell battery (up to 5.5V) and system electronics. At a typical 1A discharge, the 28 mOhm switch dissipates only an estimated 28 mW (I2xR = 1 x 0.028), preserving runtime compared with discrete MOSFET solutions that also require gate-drive circuitry. The low shutdown leakage means the switch itself consumes negligible current when the system is off, which directly extends shelf life in inventory and storage scenarios. Controlled slew rate avoids connector sparking and capacitor inrush when the battery reconnects, improving contact reliability in removable-battery products.
推荐
Peripheral Power Switching in Portable Instruments
Handheld test instruments, medical monitoring devices, and portable data loggers use the TPS22991ICNRAAR to switch peripherals such as displays, backlight LEDs, GPS receivers, and wireless modules on and off under MCU control. The 2.7A rating with 28 mOhm RON handles the high pulse currents of displays and radios without measurable voltage drop, while the -55C to +125C range covers sterilization-adjacent and outdoor use conditions. The direct low-voltage GPIO interface eliminates level-shifting, and the 0.4 mm-pitch UQFN-HR package fits the dense mixed-signal boards typical of portable instruments. Turn-on soft-start protects sensitive analog front ends from supply transient artifacts.
推荐
Processor and RF Power-Up Sequencing
Multi-rail processors and RF front ends require defined power-up order to avoid latch-up and excessive current draw. The TPS22991ICNRAAR provides an easy sequencing element: each rail's EN pin is driven by an RC-delayed or GPIO-controlled signal, and the controlled slew rate produces monotonic, inrush-limited ramp-up on rails with large decoupling capacitance. Operating from 1.0V to 5.5V, one device covers core, I/O, and RF supply domains up to 2.7A. The tiny 0.85 mm x 0.75 mm footprint allows sequencing switches to be placed close to each load point rather than clustered at the PMIC, improving decoupling effectiveness per the TI datasheet application guidance.
推荐
推荐产品汇总
工程参考数据： TPS22991ICNRAAR ——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 | TPS22990 | TPS22991ICNRR | TPS22991CNR |
|---|---|---|---|---|
| Package | 4-UQFN-HR (0.85 mm x 0.75 mm) | 4-UQFN small plastic - same footprint | 4-UQFN-HR (0.85x0.75) - same | 4-UQFN small plastic - same footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| On-Resistance (RON) | 28 mOhm | Comparable (per cross-reference) | 28 mOhm (same series) | 25 mOhm (-11%) |
| Slew Rate Control | Yes (controlled turn-on) | Yes (family feature) | Yes (same series) | Yes (same family) |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant |
关键差异点
- Extended -55C low-temperature operation （对比 TPS22991CNR)
- Industry-leading tiny footprint （对比 TPS22990)
- Controlled slew rate with low shutdown leakage （对比 TPS22991CNR)
设计说明
Verify the pin assignment before layout or substitution. Unlike most 4-pin load switches that follow the IN-OUT-GND-EN convention, the TPS22991 uses a special pinout, as documented in TI's E2E forum thread from January 2025 ('TPS22991: Possible alternative with same pinout'). An engineer who assumed the generic arrangement discovered the mismatch after layout. Extract pin coordinates directly from the TI TPS22991 datasheet and re-check every drop-in candidate against that exact ordering.
Estimated conduction losses: at the full 2.7A continuous rating, power dissipated in the switch is I2xRON = 7.29 x 0.028 Ohm = approximately 204 mW. The 0.85 mm x 0.75 mm UQFN-HR package has minimal thermal mass, so provide generous copper pour on the PCB connected to the switch terminals to keep junction temperature within the -55C to +125C range. Reduce continuous current at high ambient temperatures or reduce copper if forced-air cooling is unavailable; consult the datasheet thermal information table for theta-JA of this specific package.
Place the TPS22991ICNRAAR close to the load point rather than close to the source: because the switch's controlled slew rate sets the inrush profile, locating it near the load minimizes the length of uncontrolled high-di/dt path after the switch. Add at least 1 uF of local input capacitance to handle the turn-on transient and keep the EN trace short and referenced to a quiet ground to prevent false turn-on from digital noise, since the EN input interfaces directly with low-voltage GPIO per the TI datasheet.
The device operates from 1.0V to 5.5V input, but output voltage droop depends on load current through the 28 mOhm RON: Estimated at 2.7A, the drop is 2.7 x 0.028 = 75.6 mV, which is meaningful on a 1.0V or 1.2V rail (over 6%). For low-voltage, high-current rails, budget this drop in the load's minimum supply requirement, or consider the base TPS22991 (25 mOhm) variant if the -55C temperature range is not needed.
合规信息
RoHS compliance per JLCPCB listing for TPS22991ICNRAAR (UQFN-4, Power Distribution Switches, ROHS). REACH, halogen-free and conflict-minerals status should be confirmed via TI product ecology documentation on ti.com.
