Texas Instruments TPS7101QP

Overview

TPS7101QP from Texas Instruments is an adjustable micropower low-dropout (LDO) voltage regulator featuring PMOS pass element architecture, 1.178 V internal reference, 285 µA typical quiescent current independent of load, 0.5 µA max sleep-state current, and power-good (PG) status output. It delivers up to 500 mA output current with ±2% output voltage tolerance over line, load, and temperature (–40°C to 125°C), and is used in battery-powered portable instrumentation requiring stable, ultra-low-quiescent-power regulation.

For engineers reviewing the TPS7101QP datasheet, TPS7101QP pinout, TPS7101QP application, or TPS7101QP equivalent, this page provides verified technical context, package-specific pin definitions, design-meaningful specifications, real-world application implementations, and validated alternative options for space-constrained, long-life embedded systems.

Technical Context

The TPS7101QP uses a PMOS pass transistor instead of conventional PNP, enabling dropout voltage directly proportional to output current (V_DO = I_O × r_DS(on)) and eliminating load-dependent quiescent current. Its feedback (FB) pin accepts external resistor divider programming across 1.2 V to 9.75 V, with FB input current ≤10 nA (25°C) ensuring minimal regulation error.

It integrates a precision 1.178 V bandgap reference (±35 mV over –40°C to 125°C), PG comparator with 12 mV hysteresis (at V_FB), and enable logic with 50 mV hysteresis. Thermal shutdown activates at 165°C, and absolute maximum input voltage is 11 V - supporting wide-input industrial and automotive-supply-rail applications.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.5 mm × 4.4 mm × 1.2 mm max height, 0.65 mm pitch, thermally enhanced with exposed pad (not electrically connected). Designed for high-density, low-profile PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable LDO regulator applications.

Compared with TPS7101QP, the TPS7A2025PDBVR offers dramatically lower quiescent current but forfeits output adjustability and power-good signaling; the LP5907MFX-3.3/NOPB provides superior noise performance in a smaller package but is limited to a single fixed output and lacks system-monitoring features essential for robust embedded power management.

Availability

TPS7101QP is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, automotive body control modules, and smart metering ICs requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS7101QP 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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of LDO design heritage and automotive-grade process validation.

The TPS71xx family was engineered for micropower, ultra-low-dropout regulation in battery-critical systems - emphasizing quiescent current independence, thermal resilience, and integrated power monitoring for next-generation portable and industrial electronics.

FAQ

What is the minimum input voltage required for TPS7101QP to regulate a 3.3 V output at 500 mA?

The minimum input voltage depends on dropout: V_IN(min) = V_OUT + V_DO. For 3.3 V output at 500 mA, r_DS(on) ≈ 0.47 Ω (from TPS7133Q data, same family), so V_DO ≈ 235 mV → V_IN(min) ≈ 3.535 V. Per datasheet, TPS7101QP's minimum VI is 2.5 V absolute, but functional regulation requires headroom above programmed V_OUT.

Can TPS7101QP be used without connecting the FB pin?

No. The TPS7101QP is an adjustable regulator requiring an external resistor divider between OUT, FB, and GND to set output voltage. Leaving FB unconnected disables regulation - the device will not produce a defined output. The FB pin has ≤10 nA input bias, enabling high-value dividers (e.g., 1 MΩ/1.21 MΩ for 3.3 V) with negligible error.

How does the PG output behave during enable/disable transitions?

The PG output is an open-drain signal that goes high-impedance when V_FB ≥1.101 V (–40°C to 125°C) and pulls low (<0.4 V at 400 µA) when V_FB drops below the threshold. During EN assertion, PG asserts after V_OUT stabilizes; during EN deassertion, PG negates before V_OUT collapses - providing clean power sequencing for downstream logic in TPS7101QP-based systems.

Is the TPS7101QP RoHS-compliant and halogen-free?

Yes. TPS7101QP is manufactured in Texas Instruments' RoHS-compliant, lead-free, and halogen-free processes. The PW (TSSOP-20) package carries JEDEC-standard marking and meets IPC/JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3), requiring bake prior to reflow if exposed beyond floor life.

What capacitor values and types are recommended for TPS7101QP stability?

TI specifies 10 µF ceramic (X5R/X7R) at OUT with ≤1 Ω total series resistance (CSR), including ESR, PCB trace, and capacitor parasitics. A 0.1 µF ceramic bypass at IN is also required. Larger CO (e.g., 100 µF) reduces output noise (74 µV_RMS vs. 89 µV_RMS), but CSR must remain ≤1 Ω to avoid instability - polymer or low-ESR tantalum may be used only if ESR is verified within spec.