Texas Instruments TPS72009YZUT

Overview

TPS72009YZUT from Texas Instruments is a 350 mA ultra-low VIN, RF-grade low-dropout linear regulator with dedicated BIAS pin architecture for dual-rail power management. It delivers 0.9 V output at ±2% accuracy over –40°C to 125°C, achieves 110 mV dropout at full load, and maintains 48 μVRMS output noise (10 Hz–100 kHz) - enabling clean power delivery in RF-sensitive camera modules and wireless baseband ICs.

For engineers reviewing the TPS72009YZUT datasheet, TPS72009YZUT pinout, TPS72009YZUT application, or TPS72009YZUT equivalent, key selection criteria include its bias-supplied light-load regulation capability (IN floating, ≤500 μA), 38 μA quiescent current, 80 dB VIN PSRR at 10 kHz, monotonic 140 μs startup, and DSBGA-5 package compatibility with space-constrained mobile PCB layouts.

Technical Context

The TPS72009YZUT implements a dual-rail NMOS LDO architecture where VIN supplies the main power path while VBIAS powers the control circuitry - enabling operation with VIN as low as VOUT + 0.5 V and VBIAS ≥ max(2.5 V, VOUT + 1.4 V). This decoupling allows high-efficiency system designs using a DC-DC converter on VIN and a stable rail on VBIAS.

Its advanced BICMOS process enables 110 mV dropout at 350 mA, 70 dB VBIAS PSRR at 10 kHz, and built-in soft-start limiting inrush current to 100 mA + ILOAD. The device supports IN-pin floating mode for light-load regulation (<500 μA) sourced entirely from VBIAS - a feature critical for dynamic power-state transitions in portable SoC subsystems.

Key Specifications

Pinout & Package

TPS72009YZUT is packaged in a 1.33 mm × 0.96 mm, 5-ball DSBGA (YZU) package with bottom-side solder balls and no exposed thermal pad. The package is optimized for ultra-thin mobile applications and requires standard reflow profiles compatible with 0.4-mm pitch assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS72012YZUT, the TPS72009YZUT provides tighter voltage matching for sub-1 V digital cores; compared with TPS79501DCQ, it delivers superior RF noise immunity, lower dropout, and unique bias-powered standby operation - making it irreplaceable in space-constrained, battery-powered RF systems.

Availability

TPS72009YZUT is available at Aetrix Electronics and suitable for mobile camera modules, wireless baseband processors, and portable medical sensor hubs requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for TPS72009YZUT 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 technologies, with decades of expertise in high-reliability, high-performance power solutions.

The TPS720 family was designed specifically for ultra-low-power, RF-sensitive portable electronics - delivering dual-rail efficiency, sub-1 V regulation, and industry-leading noise/PSRR in wafer-level chip-scale packages.

FAQ

What is the minimum input voltage required for TPS72009YZUT to regulate 0.9 V output?

The TPS72009YZUT requires VIN ≥ VOUT + 0.5 V = 1.4 V under normal operation. However, when the IN pin is left floating, the device regulates 0.9 V using only the BIAS supply - provided VBIAS ≥ max(2.5 V, VOUT + 1.4 V) = 2.3 V. This dual-mode operation enables flexible power architecture design in the TPS72009YZUT.

Does TPS72009YZUT support operation with the IN pin disconnected?

Yes - the TPS72009YZUT uniquely supports regulated 0.9 V output with IN floating, drawing up to 500 μA from the BIAS pin. This mode is explicitly characterized and specified in the datasheet for light-load power-gating scenarios. The TPS72009YZUT maintains ±1% output accuracy under this condition, enabling true zero-VIN standby functionality.

What output capacitor is required for stability with TPS72009YZUT?

The TPS72009YZUT is stable with a minimum 2.2 μF X5R or X7R ceramic capacitor on the OUT pin. TI specifies maximum ESR < 250 mΩ and recommends placement within 3 mm of the device. No input capacitor is required for stability, though a 0.1–1 μF ceramic cap on IN improves transient response - a key design requirement confirmed for the TPS72009YZUT.

How does the BIAS pin function in TPS72009YZUT, and what voltage range is acceptable?

The BIAS pin powers the internal control circuitry of the TPS72009YZUT independently from VIN. It must be supplied with ≥ max(2.5 V, VOUT + 1.4 V) = 2.3 V and ≤ 5.5 V. At 2.7 V BIAS, the TPS72009YZUT achieves 70 dB PSRR at 10 kHz and enables IN-floating operation - distinguishing it from conventional single-rail LDOs.

Is TPS72009YZUT pin-compatible with other devices in the TPS720 family?

Yes - all YZU-package TPS720 variants (e.g., TPS72012YZUT, TPS72015YZUT) share identical 5-ball DSBGA layout, pin functions, and thermal characteristics. The TPS72009YZUT can be substituted on the same footprint for any 0.9–3.3 V output variant without PCB revision, provided system-level voltage and load requirements align.