Texas Instruments TPS7A8012DRBR

Overview

TPS7A8012DRBR from Texas Instruments is a fixed-output, 1.2-V, 1-A low-dropout linear regulator with PMOS pass device, 500-mV dropout at 1 A, 63-dB PSRR at 1 kHz, and 14.3 × V_OUT μV_RMS output noise (100 Hz–100 kHz) using 0.01-μF NR capacitor. It delivers stable power to high-speed analog circuitry in telecom infrastructure and PLL/VCO supplies.

For engineers reviewing the TPS7A8012DRBR datasheet, TPS7A8012DRBR pinout, TPS7A8012DRBR application, or TPS7A8012DRBR equivalent, key selection criteria include guaranteed 3% output accuracy over –40°C to +125°C, compatibility with 4.7-μF ceramic output capacitors, thermal shutdown at 160°C, and enable-controlled shutdown with 2-μA quiescent current.

Technical Context

The TPS7A8012DRBR employs a BiCMOS process with a PMOS pass transistor to achieve low noise and high PSRR across 100 Hz–1 MHz. Its feedback loop uses an internal 1.243-V reference and SNS pin for output voltage sensing, eliminating external resistors.

It integrates quick-start circuitry that charges the NR capacitor via a 33-kΩ path for ~2 ms, then switches to a 250-kΩ RC filter for noise reduction. The device features undervoltage lockout (UVLO) with 1.98-V threshold and 75-mV hysteresis, plus foldback current limiting and thermal shutdown.

Key Specifications

Pinout & Package

TPS7A8012DRBR is housed in a thermally enhanced 3-mm × 3-mm VSON-8 (DRB) package with exposed thermal pad. Pin 4 and the underside pad are GND; pins 1–2 and 7–8 are paralleled OUT and IN respectively for low-impedance routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A8012DRBR, TPS7A8112DRBR offers higher current capacity at the cost of increased dropout, while LP5907MFX-1.2/NOPB trades performance and feature set for footprint reduction and lower cost in low-power roles.

Availability

TPS7A8012DRBR is available at Aetrix Electronics and suitable for telecom infrastructure, audio signal processing, high-speed interface (PLL/VCO), and industrial control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS7A8012DRBR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in power management ICs.

The TPS7A80 family was designed specifically for noise-sensitive, wide-bandwidth applications such as PLL/VCO power, high-speed data converters, and RF signal chains where PSRR and output noise directly impact system-level jitter and SNR.

FAQ

What is the minimum input voltage required for stable operation of the TPS7A8012DRBR?

The TPS7A8012DRBR requires a minimum input voltage of 2.2 V per its Recommended Operating Conditions. This ensures proper UVLO release and stable regulation even at maximum dropout (500 mV), allowing operation down to 1.7 V output headroom. Below 2.2 V, the device may enter undervoltage lockout and cease regulation.

Can the TPS7A8012DRBR be used without the NR capacitor?

Yes, the TPS7A8012DRBR functions without the NR capacitor, but output noise increases to 14.6 × V_OUT μV_RMS (≈17.5 μV_RMS). The NR pin is left floating or grounded if noise reduction is not required; however, omitting the capacitor forfeits the soft-start benefit and degrades PSRR above 10 kHz.

How does the SNS pin improve regulation accuracy in the TPS7A8012DRBR?

The SNS pin in the TPS7A8012DRBR provides remote output voltage sensing at the load, compensating for IR drop across PCB traces. By connecting SNS directly to the load's VCC pin, the feedback loop maintains ±0.3% accuracy at the point of use - critical for high-current, low-voltage rails where trace resistance causes measurable voltage loss.

Is the TPS7A8012DRBR compatible with ceramic output capacitors smaller than 4.7 μF?

No - the TPS7A8012DRBR is only guaranteed stable with ≥4.7-μF ceramic output capacitance, as specified in the datasheet. Using smaller values risks oscillation due to insufficient phase margin; tantalum or aluminum electrolytic alternatives are not recommended due to ESR and aging effects.

What thermal derating applies to the TPS7A8012DRBR at 125°C ambient?

At 125°C ambient, the TPS7A8012DRBR's maximum continuous output current is limited by thermal constraints. With R_θJA = 47.8°C/W and 160°C thermal shutdown, the safe dissipation limit is ~0.73 W - corresponding to ~0.6 A at 1.2 V output with 2.2 V input (1-V dropout). Board-level copper area significantly impacts actual capability.