TPS22991IBNRAAR - 5.5V 2.7A Load Switch UQFN-HR | Texas Instruments
料号： TPS22991IBNRAAR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.29 | $0.29 |
| 10 | $0.26 | $2.60 |
| 100 | $0.22 | $22.00 |
| 500 | $0.19 | $95.00 |
| 1,000 | $0.16 | $160.00 |
TPS22991IBNRAAR 概述
A load switch is a type of power management IC (power distribution switch) that gates a voltage rail on and off under logic control, protecting downstream circuitry from inrush current and enabling power sequencing. Within the power-management hierarchy, the TPS22991I family sits between a voltage regulator and a simple discrete MOSFET switch: it provides controlled turn-on without regulation of the rail voltage itself.
Key features include a low on-resistance of 28 mOhm, which minimizes voltage drop and conduction loss at multi-ampere loads, and a controlled slew rate that limits inrush current when charging large bulk capacitance. The ON/OFF control input interfaces directly with low-voltage GPIO signals, allowing the switch to be driven by microcontrollers and processors operating well below the main rail voltage. Low shutdown leakage makes the device suitable for battery-powered designs where off-state quiescent draw must be minimized.
Technically, the integrated N-channel pass element is driven by an internal charge-pump-free gate-drive scheme referenced to the input pin, with slew-rate control implemented through a controlled gate-drive ramp. This gives a predictable, monotonic output voltage ramp that avoids the sharp turn-on transients typical of uncontrolled discrete MOSFET switching.
Typical applications include power-rail gating for battery-powered portable electronics, module power sequencing in processors and FPGAs, and load switching in industrial sensors operating over extended temperature ranges. The tiny 0.85 mm x 0.75 mm footprint suits densely packed wearables and IoT modules.
Design consideration: verify the device pinout carefully. Unlike most single-channel load switches that use an IN-OUT-GND-EN ordering, the TPS22991I pinout is documented as special in TI's E2E forum, so confirm pin assignments against the manufacturer datasheet before layout.
This page synthesizes distributor availability, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： TPS22991IBNRAAR ——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： TPS22991IBNRAAR （相同外形与封装尺寸） ——差异在于 Maximum Continuous Current, Package, Shutdown Leakage, Slew Rate Control.
快速对比工具——选择替代料号进行并排对比：
TPS22991IBRAAR
✅ 直接替换✓ 有现货
$0.17 / 个
查看数据手册 →TPS22991IBNRAAR 最大额定值与电气特性
| Product Type | Single-channel load switch (power distribution switch) |
| 输入电压范围 | 1.0 V to 5.5 V |
| Maximum Continuous Current | 2.7 A (rated suffix); device supports 3 A maximum continuous |
| On-Resistance (RON) | 28 mOhm |
| Number of Channels | 1 |
| Switch Type | N-Channel, high-side, 1:1 |
| Slew Rate Control | Controlled slew rate (inrush limiting) |
| Control Interface | ON/OFF input, interfaces directly with low-voltage control signals |
| Shutdown Leakage | Low shutdown leakage |
| 工作温度范围 | -55C to +125C |
| 封装 | 4-UQFN-HR (RAA), 0.85 mm x 0.75 mm, 0.4 mm pitch |
| 安装类型 | Surface Mount |
| Packing | Tape & Reel (R suffix) |
| Temperature Grade | I (extended, -55 to 125) |
| Output Discharge | Not available on TPS22991I family base description (TPS22991 base family offers optional output discharge) |
TPS22991IBNRAAR 4-uqfn-hr (raa), 0.85 mm x 0.75 mm, 0.4 mm pitch 引脚配置指南
TPS22991IBNRAAR（4-uqfn-hr (raa), 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： TPS22991IBNRAAR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
TPS22991IBNRAAR 适用于 6 应用s: Battery-Powered Portable and Wearable Devices, Processor and FPGA Power Sequencing, Industrial Sensors Operating at Extended Temperature, IoT Module and Radio Power Gating, SSD, Storage, and Peripheral Rail Switching, Medical and Diagnostic Portable Devices.
Battery-Powered Portable and Wearable Devices
The TPS22991IBNRAAR fits wearable and portable electronics where board area is the scarcest resource: its 0.85 mm x 0.75 mm 4-pin UQFN-HR package occupies a fraction of the area of conventional SOT-23 load switches, freeing layout space for sensors and radios. The 28 mOhm on-resistance keeps the voltage drop below 76 mV at the full 2.7A rating, so battery rails routed through the switch preserve accuracy for power-hungry transmitters during burst operation. Low shutdown leakage is equally important in battery designs, because off-state draw through the switch directly erodes standby battery life. The ON/OFF input accepts low-voltage logic from the system MCU, allowing the processor to gate peripheral rails such as displays, sensors, or radios under firmware control. Place the switch close to the load with short wide traces; because the controlled slew rate limits inrush, large downstream bulk capacitors can be charged without violating the battery protection current limits.
推荐
Processor and FPGA Power Sequencing
Modern processors, SoCs, and FPGAs require multiple rails to power up and down in a defined order, and the TPS22991IBNRAAR is an economical sequencing element for this job. Operating from a 1.0V to 5.5V input, it can gate core, I/O, or auxiliary rails across the common 1.0V/1.8V/3.3V voltage classes, and its ON/OFF pin interfaces directly with a low-voltage sequencer or CPLD GPIO without level shifting. The controlled slew rate produces a monotonic output ramp, which power-management supervisors and brownout detectors expect; an abrupt turn-on could trigger false fault detection. Because the device carries up to 2.7A, it can switch substantial loads such as memory banks or I/O rail domains, not just enable pins. In a typical sequencing chain, the sequencing controller releases each TPS22991IBNRAAR in order, and the switch output-monitor-free design keeps the BOM minimal. Verify the special pinout against the TI datasheet during layout to avoid miswiring.
推荐
Industrial Sensors Operating at Extended Temperature
The -55C to +125C operating range of the TPS22991IBNRAAR distinguishes it from commercial-grade load switches limited to -40C to +85C, making it appropriate for industrial sensor nodes, field transmitters, and equipment exposed to outdoor or high-temperature environments. The I temperature grade in the ordering code confirms this extended characterization per the TI product page. In a typical 4-20 mA or IO-Link field transmitter, the switch gates power to the sensor front end, communication transceiver, or auxiliary diagnostics circuit, allowing the MCU to duty-cycle high-draw blocks and reduce average system power. The 28 mOhm on-resistance limits self-heating: estimated dissipation at 1A is only I2 x R = 28 mW, so junction temperature rise in the tiny UQFN-HR package remains modest even at 125C ambient. The controlled slew rate also suppresses inrush-induced rail droop on long cable-powered supplies, improving system robustness in electrically noisy factory environments.
推荐
IoT Module and Radio Power Gating
Cellular, LoRa, and GNSS modules impose strict requirements on their supply: high burst currents during transmission and clean, low-drop rails for sensitive receive circuitry. The TPS22991IBNRAAR addresses both. Its 2.7A continuous rating covers the transmit burst currents of sub-GHz and 2.4 GHz radios, while the 28 mOhm on-resistance keeps the rail from sagging - at 2.7A the drop is roughly 76 mV, which preserves the module's minimum-supply-voltage margin. The controlled slew rate charges the module's bulk input capacitance gradually, preventing the inrush spike that could collapse a small coin cell or current-limited supply at boot. Because the ON/OFF input works with low-voltage logic, a 1.8V MCU GPIO can gate a 3.3V module rail directly. Low shutdown leakage means the module can be fully isolated from the battery between transmissions. Estimated dissipation at 1.5A average transmit current is I2 x R = 63 mW.
推荐
SSD, Storage, and Peripheral Rail Switching
In storage subsystems and peripheral boards, the TPS22991IBNRAAR serves as a hot-switch element for 3.3V and 5V device rails carrying multi-ampere loads. The 2.7A continuous rating and 28 mOhm on-resistance mean a full-rated load dissipates an estimated I2 x R = 2.7^2 x 0.028, roughly 204 mW, which the UQFN-HR package handles with basic copper pours on a standard 4-layer PCB. The controlled slew rate is valuable here for a different reason: when a storage device or peripheral is hot-attached, its input capacitors are fully discharged, and an uncontrolled switch would draw a large inrush spike capable of browning out the host rail. The TPS22991I ramps the output predictably instead. The low-voltage ON/OFF control allows a host microcontroller or hot-swap controller to gate the device rail during enumeration or fault conditions, implementing firmware-controlled power cycling of misbehaving peripherals without mechanical relays.
推荐
Medical and Diagnostic Portable Devices
Portable medical instruments - blood-glucose meters, wearable biosensors, handheld diagnostics - combine the space constraints of wearables with the reliability expectations of medical equipment, and the TPS22991IBNRAAR addresses both. The 0.85 mm x 0.75 mm UQFN-HR footprint fits under shields and beside RF front ends in densely packed sensor pods, while the -55C to +125C characterization provides margin for sterilization-adjacent and transport-temperature excursions beyond standard commercial grading. The switch gates power to analog front ends, Bluetooth modules, and display backlights under MCU control; the 28 mOhm on-resistance ensures that a 200 mA AFE load sees only an estimated 5.6 mV of additional drop, preserving measurement-relevant rail accuracy. The controlled slew rate prevents inrush spikes from disturbing sensitive analog measurements during power-up, and low shutdown leakage extends the shelf life of battery-operated devices awaiting use in clinical storage.
推荐
推荐产品汇总
工程参考数据： TPS22991IBNRAAR ——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 | TPS22991IBRAAR |
|---|---|---|
| Package | 4-UQFN-HR (RAA), 0.85 x 0.75 mm | 4-UQFN-HR (RAA), 0.85 x 0.75 mm - same |
| Brand | Texas Instruments | Texas Instruments |
| Input Voltage Range | 1.0 V to 5.5 V | 1.0 V to 5.5 V |
| Rated Continuous Current | 2.7 A | 2.7 A |
| On-Resistance | 28 mOhm | 28 mOhm |
| Operating Temperature | -55C to +125C | -55C to +125C |
| Slew Rate Control | Yes (controlled) | Yes (controlled) |
| Packing Option | Tape & Reel (BNR ordering code) | Tape & Reel (BR ordering code, different reel quantity) |
关键差异点
- Ultra-compact footprint （对比 Conventional SOT-23 load switches)
- Extended -55C to +125C temperature range （对比 Standard commercial-grade TPS22991 variants)
- Low 28 mOhm on-resistance in a tiny package （对比 Typical small load switches with 50-100+ mOhm RON)
设计说明
Verify the pinout before layout. As documented in TI's E2E power-management forum (thread 'TPS22991: Possible alternative with same pinout', January 2025), the TPS22991I does not follow the conventional IN-OUT-GND-EN top-view pin ordering used by most single-channel load switches, and one engineer reported designing the part in assuming the standard order. Open the TI TPS22991I datasheet pin-configuration diagram and cross-check each net assignment before routing the 4-pin UQFN-HR (RAA) footprint.
Estimated: at the full 2.7A continuous rating with 28 mOhm on-resistance, the switch dissipates I2 x R = 2.7^2 x 0.028, approximately 204 mW. In a 0.85 mm x 0.75 mm UQFN-HR package this is significant per unit area, so use solid copper pours on the input and output nets extending beyond the footprint and rely on board copper as the heat path. At loads of 1A or below the estimated dissipation is only about 28 mW and thermal design is generally not a concern. Check the datasheet thermal-impendence curves against your actual ambient maximum.
Do not assume cross-family or cross-brand load switch substitution. The standard (non-I) TPS22991 uses a different die (25 mOhm, optional output discharge per TI product pages), and conventional competitor load switches in 4/5-pin packages are not pin-compatible given this device's special pinout. The controlled slew rate is internally fixed - there is no external CT pin for adjusting turn-on time, so if your inrush budget requires a specific ramp, confirm the datasheet slew-rate specification meets it rather than expecting tuneability.
合规信息
Compliance data was not present in the retrieved web data; consult the TI product page for TPS22991I for RoHS/REACH status of the RAA package.
