Texas Instruments TPS7A1409PDRVR

Overview

TPS7A1409PDRVR from Texas Instruments is a 1-A ultra-low-dropout linear regulator (LDO) optimized for battery-powered systems requiring sub-1-V input and low-output voltage regulation. It delivers 0.9 V output with ±1% accuracy over –40°C to +125°C, supports 0.7 V–2.2 V input via IN pin and 2.2 V–5.5 V bias rail via BIAS pin, and achieves 70 mV max dropout at 1 A load - enabling high-efficiency power delivery in camera modules and wearables.

For engineers reviewing the TPS7A1409PDRVR datasheet, TPS7A1409PDRVR pinout, TPS7A1409PDRVR application, or TPS7A1409PDRVR equivalent, this page provides verified technical context, package-specific pin functions, real-world transient performance data, and validated alternative options for low-voltage, high-accuracy LDO selection in space-constrained portable electronics.

Technical Context

The TPS7A1409PDRVR operates in a dual-rail architecture: the IN pin supplies the main power path (down to 0.7 V), while the BIAS pin powers internal control circuitry (2.2 V–5.5 V), decoupling reference stability from low VIN constraints. Its global UVLO requires both VIN ≥ 603 mV (rising) and VBIAS ≥ 1.42 V (rising) before enabling regulation.

It implements hybrid foldback current limiting (ICL = 1.035–2.45 A, ISC = 600 mA) and active pulldown discharge (RPULLDOWN = 36 Ω) triggered by EN low, VIN/Bias UVLO, or thermal shutdown. Transient response is specified at ±20 mV for 3 mA → 600 mA load steps in 20 µs with COUT ≥ 2.2 µF.

Key Specifications

Pinout & Package

TPS7A1409PDRVR uses the DRV (WSON-6) package: 2 mm × 2 mm, 6-pin wettable flank WSON with exposed thermal pad electrically tied to GND. Thermal pad must be soldered to PCB ground plane for RθJB = 32.7°C/W and reliable 1-A operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-dropout LDO applications.

Compared with TPS7A1409PDRVR, TPS7A1601DGNR trades 1-A capability and dual-rail architecture for nanoamp IQ, while NCP114AMX18T2G offers smaller footprint but lacks BIAS support and active discharge - making TPS7A1409PDRVR uniquely suited for high-current, LILO, and fast-transient portable power rails.

Availability

TPS7A1409PDRVR is available at Aetrix Electronics and suitable for camera modules, wireless earbuds, and smart watches requiring stable component supply with guaranteed long-term manufacturability and full lifecycle support.

Supply support for TPS7A1409PDRVR 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 TPS7A14 family is designed specifically for ultra-low-input, ultra-low-output voltage regulation in battery-powered devices - addressing the need for high-efficiency, high-accuracy LDOs that operate below 1 V input while maintaining robust transient performance and thermal safety.

FAQ

What is the minimum input voltage required for TPS7A1409PDRVR to regulate 0.9 V output?

The TPS7A1409PDRVR requires VIN ≥ VOUT + VDO, where VDO is 70 mV (max) at 1 A and –40°C to +85°C. Thus, minimum functional VIN is 0.97 V. However, the device specifies operation down to 0.7 V on the IN pin - meaning it will not regulate below 0.97 V but remains powered and ready when VIN rises above that threshold. The BIAS pin must simultaneously be ≥1.42 V for startup.

Does TPS7A1409PDRVR require an external capacitor on the BIAS pin?

Yes, TPS7A1409PDRVR requires a minimum 0.47-µF ceramic capacitor from BIAS to GND. While not mandatory for basic stability, this capacitor is essential to maintain specified PSRR (65 dB at 1 kHz), output noise (7.2 µVRMS), and transient response performance. Omitting it degrades high-frequency noise rejection and load-step recovery.

How does the SENSE pin improve regulation accuracy in TPS7A1409PDRVR?

The SENSE pin on TPS7A1409PDRVR provides remote feedback by connecting directly to the load's power input node. This compensates for voltage drop across PCB traces between the OUT pin and load, ensuring the regulated voltage is maintained precisely at the point of use - critical for SoCs and sensors where even 20-mV droop can affect timing margins or ADC accuracy.

Can TPS7A1409PDRVR be used without the EN pin connected?

Yes, TPS7A1409PDRVR can operate without external EN control: the EN pin must be tied to either the IN or BIAS rail to enable regulation permanently. Leaving EN floating is not allowed - it may cause unpredictable startup behavior due to noise coupling. For always-on applications, connect EN directly to BIAS (preferred) or IN.

What thermal derating applies to TPS7A1409PDRVR at 1 A continuous load?

With the DRV (WSON-6) package mounted on a 2-layer PCB with 1-in² 1-oz copper pour connected to the thermal pad, TPS7A1409PDRVR has RθJA = 72.7°C/W. At 1 A and 100-mV dropout (100 mW dissipation), junction rise is ~7.3°C - well within the 125°C max TJ. Derating begins only above ~1.5 A or in restricted airflow environments; thermal shutdown triggers at 165°C.