Texas Instruments TPS62912RPUR

Overview

TPS62912RPUR from Texas Instruments is a 2-A, 3-V to 17-V input, low-noise synchronous buck converter with integrated ferrite-bead filter compensation, 2.2-MHz/1-MHz fixed-frequency peak-current-mode control, ±1% output voltage accuracy, and 57-mΩ/20-mΩ high-side/low-side R_DS(on). It delivers ultra-low 1/f noise (<20 µV_RMS, 100 Hz–100 kHz) and <10 µV_RMS output ripple after ferrite-bead filtering-enabling direct replacement of LDOs in high-speed ADC, clock jitter cleaner, and radar power rails.

For engineers reviewing the TPS62912RPUR datasheet, TPS62912RPUR pinout, TPS62912RPUR application, or TPS62912RPUR equivalent, this device supports precise sequencing via adjustable enable threshold, spread-spectrum modulation for spur suppression, optional output discharge, and synchronization to external clocks-critical for noise-sensitive telecom, aerospace, medical, and test-and-measurement systems.

Technical Context

The TPS62912RPUR implements fixed-frequency peak-current-mode control with selectable 2.2 MHz or 1 MHz operation, configurable via S-CONF resistor. Its internal loop compensation supports stability with up to 50 nH second-stage ferrite-bead inductance, enabling post-filter regulation that maintains output accuracy despite voltage drop across the bead.

Low-frequency noise is suppressed by filtering the internal 0.8-V reference through an external capacitor on NR/SS (470 nF typical), achieving LDO-like 1/f performance. Spread-spectrum modulation-triangular or random-is resistor-selectable and reduces mixing spurs in ADC/AFE signal chains without degrading PSRR (>65 dB up to 100 kHz).

Key Specifications

Pinout & Package

TPS62912RPUR uses a 2.0-mm × 2.0-mm, 10-pin QFN package (RPU) with 0.5-mm pitch and wettable flanks for automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise buck converter applications.

Compared with TPS62912RPUR, TPS62913RPUR offers higher current headroom in identical packaging but increases conduction loss at light loads, while LM61480RPWR trades integrated noise-reduction features for broader input range (3–36 V) and lower BOM count in non-critical analog rails.

Availability

TPS62912RPUR is available at Aetrix Electronics and suitable for telecom infrastructure, aerospace/defense radar systems, and medical imaging equipment requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS62912RPUR 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 power management ICs, with decades of heritage in high-reliability power conversion solutions.

The TPS6291x product line was designed specifically for noise-sensitive applications-replacing LDOs in high-speed data converters, clock ICs, and RF signal chains-by integrating ferrite-bead compensation, ultra-low noise references, and spread-spectrum control in a miniature QFN.

FAQ

What is the maximum supported ferrite-bead inductance for stable operation of the TPS62912RPUR?

The TPS62912RPUR integrates loop compensation validated for second-stage ferrite-bead inductance up to 50 nH. This enables use of common 0402/0603 ferrite beads (e.g., TDK MPZ1608S101A, Murata BLM18AG101SN1) without external compensation components. Exceeding 50 nH risks instability or degraded transient response, as confirmed in Section 6.3 and Figure 7-1 of the TPS62912RPUR datasheet.

Does the TPS62912RPUR require an external capacitor on the NR/SS pin, and what is its function?

Yes, the TPS62912RPUR requires an external capacitor (typically 470 nF) on the NR/SS pin. This capacitor performs two critical functions: it sets the soft-start ramp time during power-up and filters the internal 0.8-V reference voltage to suppress low-frequency 1/f noise-achieving <20 µV_RMS output noise in the 100 Hz–100 kHz band. Omitting this capacitor disables both soft-start and ultra-low-noise operation.

Can the TPS62912RPUR be synchronized to an external clock, and what are the frequency tolerance limits?

Yes, the TPS62912RPUR supports external clock synchronization via the EN/SYNC pin. When configured for 2.2-MHz operation (S-CONF = 4.87 kΩ), the synchronization range is 1.9–2.42 MHz; for 1-MHz operation (S-CONF = 9.31 kΩ), it is 0.86–1.2 MHz. The clock must meet logic thresholds (V_H = 1.1 V, V_L = 0.4 V) and maintain duty cycle between 45% and 55%, as specified in Section 6.5 of the TPS62912RPUR datasheet.

How does the TPS62912RPUR achieve ±1% output voltage accuracy across temperature and load?

The TPS62912RPUR achieves ±1% output voltage accuracy over –40°C to 150°C junction temperature and full 0–2-A load range via a trimmed 0.8-V internal reference, precision feedback amplifier (±0.5% gain error), and post-filter regulation architecture. The VO pin senses voltage *after* the ferrite-bead filter, allowing the control loop to correct for IR drop-ensuring accuracy is maintained even with second-stage filtering, per Section 6.5 Electrical Characteristics.

Is output discharge functionality enabled by default on the TPS62912RPUR, and how is it activated?

No, output discharge is disabled by default on the TPS62912RPUR. It is activated by selecting an S-CONF resistor value that configures "ON" for discharge (e.g., 18.2 kΩ for 2.2-MHz operation with discharge). When enabled, the device connects an internal ~7-Ω discharge path between VOUT and PGND upon shutdown (EN/SYNC low), discharging output capacitors within milliseconds-critical for safety-critical or multi-rail sequencing applications.