Texas Instruments TPS22949AYZPR

Overview

TPS22949AYZPR from Texas Instruments is a dual-function current-limited load switch with integrated low-noise 1.8-V RF LDO regulator, operating across 1.62 V to 4.5 V input voltage range, featuring 350-mΩ ON-resistance at 3.3 V, 100-mA minimum current limit, and 50 μV_rms output noise (10 Hz–100 kHz). It protects fingerprint modules and portable consumer electronics by combining overcurrent protection with stable low-noise power delivery.

For engineers reviewing the TPS22949AYZPR datasheet, TPS22949AYZPR pinout, TPS22949AYZPR application, or TPS22949AYZPR equivalent, key selection criteria include its dual enable control (EN1/EN2), 130-μs LDO start-up time, 1.8-V fixed LDO output with 2% accuracy, and YZP 8-bump DSBGA package compatibility with space-constrained mobile designs.

Technical Context

The TPS22949AYZPR integrates two independent functional blocks: a P-channel MOSFET current limiter (VIN → VOUTCL) with auto-restart fault handling and an RF-optimized LDO (VOUTCL → VOUTLDO) delivering regulated 1.8 V. Its EN1/EN2 logic enables precise sequencing-EN1 controls the switch only, EN2 enables the LDO only, and both high activates full functionality.

It employs internal UVLO on both VIN (1.39–1.59 V threshold) and V+ (2.3–2.55 V), fast short-circuit response (<11 μs), and blanking time (6–18 ms) to suppress false trips during inrush. The LDO achieves 80-dB PSRR at 10 kHz and maintains stability with ≥2.2-μF ceramic output capacitance.

Key Specifications

Pinout & Package

TPS22949AYZPR uses an 8-terminal DSBGA (YZP) package measuring 1.90 mm × 0.90 mm with 0.5-mm pitch and 0.5-mm height. The exposed thermal die pad on the underside may be connected to GND or left floating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-limited load switch with integrated LDO applications.

Compared with TPS22949DRGR, TPS22949AYZPR offers superior thermal performance in ultra-compact form factor but requires micro-BGA assembly; versus TPS22965YFPR, it trades higher current rating for integrated 1.8-V/100-mA LDO with 50-μV_rms noise-critical for RF-sensitive endpoints.

Availability

TPS22949AYZPR is available at Aetrix Electronics and suitable for fingerprint module protection, smartphone power sequencing, notebook subsystem isolation, and control access system power management requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS22949AYZPR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.

The TPS22949A product line delivers integrated load switches with embedded LDO regulation for space-constrained, noise-sensitive portable electronics-designed specifically to replace discrete switch + LDO combinations in mobile and wearable platforms.

FAQ

What is the function of the EN2 pin on the TPS22949AYZPR?

The EN2 pin on the TPS22949AYZPR is the active-high enable input for the integrated 1.8-V low-noise LDO regulator. When EN2 is high and EN1 is also high, both the current limiter and LDO operate; when EN2 is low, the LDO output (VOUTLDO) is disabled regardless of EN1 state. This allows independent control of analog and digital power domains, supporting flexible sequencing in systems like smartphones where the LDO must remain off until after core logic initialization. The TPS22949AYZPR requires EN2 ≥1.4 V to activate the LDO.

Does the TPS22949AYZPR require an input capacitor on the VIN pin?

While the TPS22949AYZPR does not require an input capacitor on VIN for stability, Texas Instruments recommends placing a 0.1-μF to 1-μF low-ESR ceramic capacitor close to the VIN pin to improve transient response, reduce noise coupling, and suppress supply impedance effects-especially important in battery-powered portable systems. The TPS22949AYZPR's internal architecture tolerates direct connection to low-impedance sources, but real-world PCB layouts benefit from local bypassing to maintain clean switching behavior and prevent false overcurrent triggering during load transients.

How does the TPS22949AYZPR handle overcurrent faults?

The TPS22949AYZPR enters constant-current mode when load current reaches its 100-mA minimum limit. If the condition persists beyond the blanking time (6–18 ms), it asserts the OC pin low and shuts off the switch. For the TPS22949AYZPR variant, an auto-restart feature then disables the switch for 70 ms before attempting re-enablement-if EN1 remains high. This cycle repeats until the fault clears. Unlike latch-off alternatives, this behavior minimizes system downtime and avoids requiring host MCU intervention, making the TPS22949AYZPR ideal for autonomous peripheral protection in mobile devices.

What is the maximum load current supported by the TPS22949AYZPR's LDO output?

The TPS22949AYZPR's integrated LDO delivers a fixed 1.8-V output rated for up to 100 mA continuous load current. At this full load, the dropout voltage is specified at 200 mV maximum (VIN – VOUTLDO), meaning the input to the LDO (i.e., VOUTCL) must be ≥2.0 V to maintain regulation. The LDO maintains 2% output accuracy across line, load, process, and temperature (–40°C to 85°C), and its 50-μV_rms noise performance is validated at 100 mA, confirming suitability for powering noise-sensitive analog and RF circuitry directly from the TPS22949AYZPR.

Can the TPS22949AYZPR operate with a 1.8-V input supply?

Yes, the TPS22949AYZPR supports VIN down to 1.62 V, including 1.8-V nominal supplies. However, when powering the 1.8-V LDO from VOUTCL, the total voltage drop across the current limiter (r_ON × I_LOAD) plus the LDO dropout (≥110 mV at 100 mA) must be accounted for: at 1.8-V VIN and 100-mA load, VOUTCL drops to ~1.74 V (assuming 600-mΩ r_ON), which falls below the 1.8-V LDO requirement. Therefore, the TPS22949AYZPR functions reliably as a switch at 1.8 V, but LDO operation requires VIN ≥2.0 V under typical load conditions to ensure VOUTCL ≥1.9 V into the LDO input.