Texas Instruments TPS22949YZPR

Overview

TPS22949YZPR from Texas Instruments is a dual-function current-limited load switch with integrated low-noise 1.8-V RF LDO regulator. It features a P-channel MOSFET (r_ON = 300 mΩ at 4.5 V), 100-mA minimum current limit, and stable LDO output with 50 μV_rms noise (10 Hz–100 kHz) - used in fingerprint module power sequencing and portable consumer electronics.

For engineers reviewing the TPS22949YZPR datasheet, TPS22949YZPR pinout, TPS22949YZPR application, or TPS22949YZPR equivalent, key selection criteria include input voltage range (1.62–4.5 V), dual enable control (EN1/EN2), overcurrent flag (OC), and YZP package compatibility for space-constrained mobile designs.

Technical Context

The TPS22949YZPR integrates two independent power paths: a current-limited switch (VIN → VOUTCL) with fast short-circuit response (≤11 μs) and auto-restart blanking (6–18 ms), and a precision 1.8-V LDO (VOUTLDO) with 80-dB PSRR at 10 kHz and 130-μs startup time. Both paths share thermal shutdown and UVLO protection.

Control logic decodes EN1/EN2 states to enable/disable the switch and LDO independently per Table 1. The OC pin provides open-drain fault reporting for overcurrent, undervoltage (VIN & V+), and overtemperature events - requiring external pull-up to VIN.

Key Specifications

Pinout & Package

TPS22949YZPR 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 must be connected to GND or left electrically floating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-path load switch and LDO applications.

Compared with TPS22949AYZPR and TPS22965YFPR, the TPS22949YZPR uniquely combines strict 100-mA current limiting with integrated low-noise 1.8-V LDO in a 1.9-mm × 0.9-mm footprint - making it optimal for space-constrained, noise-sensitive biometric subsystems requiring deterministic fault behavior.

Availability

TPS22949YZPR is available at Aetrix Electronics and suitable for fingerprint module protection, smartphone power sequencing, and notebook subsystem isolation requiring stable component supply across industrial temperature ranges (–40°C to 85°C).

Supply support for TPS22949YZPR 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 specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.

The TPS22949YZPR belongs to TI's TPS229xx family of ultra-small load switches with integrated regulation - designed specifically for space-constrained, noise-sensitive mobile and biometric systems requiring precise current limiting and clean analog power.

FAQ

What is the primary function of the OC pin on the TPS22949YZPR?

The OC (Overcurrent) pin on the TPS22949YZPR is an open-drain fault flag that pulls low during overcurrent, input undervoltage (VIN or V+), or overtemperature conditions. It requires an external pull-up resistor to VIN and signals faults to the host microcontroller. For the TPS22949YZPR, OC remains asserted for the duration of the fault and clears automatically after recovery - enabling reliable system-level fault monitoring without additional supervision circuitry.

Can the TPS22949YZPR operate with VIN = 1.8 V while delivering 100 mA to the LDO output?

Yes, the TPS22949YZPR can operate with VIN = 1.8 V while delivering 100 mA to VOUTLDO, but only if V+ ≥ 2.6 V and the total dropout (r_ON × I_LOAD + V_DO) remains within margin. At VIN = 1.8 V, r_ON ≈ 600 mΩ and V_DO ≈ 200 mV, so VOUTLDO = 1.8 V − (0.6 Ω × 0.1 A) − 0.2 V = 1.54 V - below regulation. Thus, TPS22949YZPR requires VIN ≥ 2.0 V for full 100-mA LDO operation. This constraint is explicitly defined in the TPS22949YZPR datasheet Section 9.1.1.

How does the TPS22949YZPR differ from the TPS22949AYZPR in terms of current limiting?

The TPS22949YZPR specifies a minimum current limit of 100 mA with no inrush enhancement, while the TPS22949AYZPR adds a higher 750-mA inrush current limit during power-up to accommodate capacitive loads without requiring large input storage capacitors. Both share identical 100-mA steady-state limit, but the TPS22949AYZPR's enhanced inrush behavior is implemented via internal circuitry not present in the TPS22949YZPR - making the latter more suitable for applications demanding strict, unvarying 100-mA current clamping at all times.

Is the 1.8-V LDO output of the TPS22949YZPR adjustable or fixed?

The 1.8-V LDO output of the TPS22949YZPR is factory-trimmed and fixed; it is not user-adjustable. The datasheet confirms VOUTLDO = 1.8 V ±2% across load, line, process, and temperature. While TI offers EEPROM-programmable variants (0.9 V to 3.6 V in 50-mV steps), those require custom ordering and are not applicable to standard TPS22949YZPR units. Therefore, the TPS22949YZPR delivers a precise, unchanging 1.8-V output without external components or configuration.

What is the recommended capacitor for VOUTCL in the TPS22949YZPR?

The TPS22949YZPR requires a 0.1-μF ceramic capacitor between VOUTCL and GND to suppress parasitic ringing during switch turn-off - a design requirement specified in Section 9.1.2 of the official datasheet. This capacitor prevents VOUTCL from undershooting GND due to board trace inductance, which could damage downstream components. Larger values are not recommended, as they may interact with the current-limit loop and degrade fault response time. The TPS22949YZPR's internal compensation is optimized for this exact value.