TPS22991IBRAAR - 2.7A, 28mOhm Load Switch | Texas Instruments
MPN: TPS22991IBRAAR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.38 | $0.38 |
| 10 | $0.32 | $3.20 |
| 100 | $0.26 | $26.00 |
| 500 | $0.21 | $105.00 |
| 1,000 | $0.17 | $170.00 |
TPS22991IBRAAR Overview
A load switch is a type of power distribution switch - a power management IC that sits between a supply rail and its load, turning power on and off under logic control. Within the power management hierarchy, load switches bridge the gap between simple discrete MOSFET switching circuits and full hot-swap controllers, providing controlled turn-on, low leakage, and small footprint in a single device.
Key features include the 28 mOhm N-channel MOSFET pass element, a controlled slew rate that limits inrush current during turn-on, and very low shutdown leakage current, which is critical for battery-powered designs that must conserve charge in the off state. The ON/OFF control input interfaces directly with low-voltage GPIO or processor control signals, eliminating the need for level-shifting circuitry in many designs.
Technically, the device integrates the MOSFET switch and edge-rate control in the tiny 0.85 mm x 0.75 mm UQFN-HR package, making it one of the smallest 2.7 A-class load switches available. The controlled turn-on behavior suppresses voltage droop on the upstream rail when charging large downstream capacitance, protecting sensitive loads from supply dips.
Typical applications include power rail sequencing and power muxing in portable and battery-powered electronics, peripheral power gating in smartphones, tablets, and wearables, and module power control in IoT and industrial sensor nodes.
When designing with this part, verify the pinout against the datasheet before layout: the TPS22991 pin assignment differs from the conventional IN-OUT-GND-EN arrangement common to most single-channel load switches, a point highlighted in TI's E2E support forum. Also confirm that the upstream rail can tolerate the inrush into downstream bulk capacitance despite the slew-rate control.
This page synthesizes distributor availability, drop-in alternative analysis, pricing tiers, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for TPS22991IBRAAR — 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 TPS22991IBRAAR (same form factor and footprint) — differing in Maximum Continuous Current, Package, Shutdown Leakage, Slew Rate Control.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS22991BRAAR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS22991IBRAAT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TPS22991IBRAAR Maximum Ratings & Electrical Characteristics
| Product Type | Single-channel load switch (power distribution switch) |
| Switch Configuration | 1:1, N-channel high-side MOSFET |
| Input Voltage Range | 1.0 V to 5.5 V |
| Maximum Continuous Current | 2.7 A (DigiKey listing; family rated up to 3 A) |
| ON-Resistance | 28 mOhm typical (per Mouser/DigiKey listing) |
| Control Input | ON/OFF pin, interfaces directly with low-voltage control signals |
| Slew Rate Control | Yes, controlled turn-on slew rate |
| Shutdown Leakage | Low shutdown leakage current (per Mouser description) |
| Operating Temperature | -55 C to +125 C (per Mouser listing) |
| Package | 4-UQFN-HR (0.85 mm x 0.75 mm) |
| Mounting Type | Surface Mount |
| Polarity | High-side, N-channel |
| Number of Channels | 1 |
| Standard Package Quantity | 3000 (reel, per Mouser) |
TPS22991IBRAAR 3000 (reel, per mouser) Pin Configuration Guide
Pin configuration for TPS22991IBRAAR (3000 (reel, per mouser) package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for TPS22991IBRAAR.
Refer to the datasheet for full pin configuration.
Typical Applications
TPS22991IBRAAR is suitable for 6 applications: Portable and Battery-Powered Device Power Gating, Power Rail Sequencing in Embedded Processors, IoT Node and Sensor Module Power Control, Industrial 24V-Down System Sub-Rail Switching, SSD and Storage Peripheral Power Switching, Camera and Display Module Power Muxing.
Portable and Battery-Powered Device Power Gating
In smartphones, tablets, and wearables, subsystem rails such as sensors, displays, and wireless modules must be switched off to extend battery life. The TPS22991IBRAAR fits this role because its 1.0 V minimum input supports single-cell battery rails, its 28 mOhm ON-resistance keeps voltage drop below roughly 76 mV at a 2.7 A load, and its very low shutdown leakage current prevents hidden battery drain when peripherals are disabled. Placed between the system rail and the peripheral load with the ON/OFF pin driven by a processor GPIO, the controlled slew rate limits inrush into downstream bulk capacitance, preventing rail droop during turn-on of large display or modem power blocks.
Recommended
Power Rail Sequencing in Embedded Processors
Multi-rail processors such as MCUs, SoCs, and FPGAs require core, I/O, and peripheral rails to power up in a defined order. The TPS22991IBRAAR provides per-rail switching with a logic-level ON/OFF input that interfaces directly with supervisor or PMIC sequencing outputs. Operating from 1.0 V to 5.5 V, it can gate low-voltage core rails as well as 3.3 V I/O rails, while the 2.7 A continuous rating covers the inrush-heavy startup phase of memory and clock circuits. The controlled slew rate suppresses voltage dips on shared upstream converters when each rail charges its decoupling capacitance, improving sequencing reliability in industrial control and automotive infotainment boards.
Recommended
IoT Node and Sensor Module Power Control
Battery-operated IoT sensor nodes duty-cycle radios, MEMS sensors, and flash memory to reach multi-year battery life. The TPS22991IBRAAR gates each module rail individually; its low shutdown leakage preserves charge during long sleep intervals, and the tiny 0.85 mm x 0.75 mm UQFN-HR footprint fits dense module PCBs. With 28 mOhm ON-resistance, radio transmit burst currents of 1 to 2 A produce minimal sag (roughly 56 mV at 2 A), keeping RF power amplifier supply rails stable. The GPIO-controlled ON/OFF input allows the host MCU to disconnect high-quiescent-current peripherals completely during sleep, achieving lower system-level standby power than leaving converters enabled.
Recommended
Industrial 24V-Down System Sub-Rail Switching
In industrial automation equipment, a 24 V bus is typically stepped down to 5 V, from which sensor interfaces, communication transceivers, and isolated supplies are distributed. The TPS22991IBRAAR gates these 5 V sub-rails with its 5.5 V maximum input and 2.7 A capacity, sufficient for driving multiple transceivers or a small motor-driver logic section. The industrial temperature capability of the I-grade version (-55 C to +125 C per Mouser listing) covers cabinet environments. The controlled turn-on prevents the upstream 5 V converter from dipping when capacitive loads such as cable harnesses and protection networks are energized, improving overall system fault tolerance during hot-insertion-like events.
Recommended
SSD and Storage Peripheral Power Switching
High-speed storage interfaces such as NVMe and SD card hosts require robust hot-swap-capable rail switching with fast, controlled turn-on. The TPS22991IBRAAR, with 2.7 A continuous current and 28 mOhm ON-resistance, can switch card and drive supply rails while limiting inrush into the card's input capacitance via its controlled slew rate, meeting host controller requirements for graceful peripheral connect events. Its shutdown leakage specification limits off-state drain on the host rail when cards are electrically disconnected. Estimated: at 2 A, dissipation is only about 0.11 W, keeping the tiny UQFN-HR junction within limits without heatsinking in typical laptop and server card-slot environments.
Recommended
Camera and Display Module Power Muxing
Camera modules, LCD panels, and backlight blocks in consumer electronics draw burst currents of 1 to 2.5 A and must be fully disconnected during standby. The TPS22991IBRAAR switches these rails from a 1.8 V to 5 V supply domain, and its controlled slew rate avoids backlight flicker and camera reset artifacts caused by inrush-induced rail droop. Because the ON/OFF input works directly with low-voltage control signals, an image processor or display controller GPIO can gate the module without additional level shifting. The device's small 0.85 mm x 0.75 mm package sits close to the flexible-PCB connector, minimizing switched-node parasitic inductance and radiated emissions during switching events.
Recommended
Recommended Products Summary
Engineering reference data for TPS22991IBRAAR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS22991BRAAR | TPS22991IBRAAT |
|---|---|---|---|
| Package | 4-UQFN-HR (0.85x0.75 mm) | 4-UQFN-HR (0.85x0.75 mm) - same | 4-UQFN-HR (0.85x0.75 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 1.0 V to 5.5 V | 1.0 V to 5.5 V | 1.0 V to 5.5 V |
| Maximum Continuous Current | 2.7 A | 3 A | 2.7 A |
| ON-Resistance | 28 mOhm | 28 mOhm | 28 mOhm |
| Operating Temperature | -55 C to +125 C | -40 C to +105 C | -55 C to +125 C |
| Slew Rate Control | Yes | Yes | Yes |
Key Differentiators
- Extended industrial temperature range (vs TPS22991BRAAR)
- Extremely small footprint at 2.7 A (vs TPS22991BRAAR)
- Non-standard pinout is a design trade-off (vs Competitor load switches with common IN-OUT-GND-EN pinout)
Design Notes
Verify the TPS22991 pin assignment against the TI datasheet before layout. A January 2025 thread on TI's E2E power management forum reported that engineers designed in the TPS22991 assuming the conventional IN-OUT-GND-EN load switch pinout and found the TPS22991 pinout is special. A footprint designed for a competitor part with the common pinout will not function without rework. Confirm pin 1 orientation from the datasheet pin configuration diagram and the package laser-mark index dot.
Estimated: at 2.7 A continuous load with 28 mOhm ON-resistance, conduction dissipation is I^2 x R = 7.29 x 0.028, approximately 0.20 W. In the 0.85 mm x 0.75 mm UQFN-HR package this is small in absolute terms but the package has minimal thermal mass, so provide solid ground pour and, where possible, thermal vias under the pad per TI datasheet layout guidance. Verify junction temperature at worst-case ambient and duty cycle, especially in sealed enclosures where ambient can be 20-30 C above room temperature.
Place the TPS22991IBRAAR close to the upstream decoupling capacitor and use an output capacitor sized to the load. The controlled slew rate limits inrush, but the turn-on time sets how fast downstream capacitance charges - very large output bulk capacitance combined with a long slew interval extends the time the switch spends in a resistive region. Keep the ON/OFF control trace short and, if driven from a different voltage domain, confirm the logic threshold per the TI datasheet electrical characteristics table.
Compliance Information
Compliance data was not present in the provided verified web data; consult the TI product page at ti.com/product/TPS22991 for official RoHS/REACH declarations.
