Texas Instruments TPS71730DCKTG4

Overview

TPS71730DCKTG4 from Texas Instruments is a fixed-output, 3.0-V, 150-mA low-dropout linear regulator in a 5-pin SC-70 package. It delivers ultra-low noise (30 µV_RMS, 100 Hz–100 kHz), high PSRR (70 dB at 1 kHz), and low dropout (170 mV typical at 150 mA) for powering noise-sensitive analog and RF circuits in portable electronics.

For engineers reviewing the TPS71730DCKTG4 datasheet, TPS71730DCKTG4 pinout, TPS71730DCKTG4 application, or TPS71730DCKTG4 equivalent, key selection criteria include output noise performance under light-to-moderate load, PSRR across 100 Hz–1 MHz, thermal behavior in compact layouts, and compatibility with 1-µF ceramic output capacitance without external compensation.

Technical Context

The TPS71730DCKTG4 uses a PMOS pass device and advanced BiCMOS process to achieve fast startup, excellent transient response, and stable regulation with only 1 µF output capacitance. Its error amplifier features high gain and bandwidth, enabling strong rejection of supply ripple even at low headroom (V_IN – V_OUT = 1 V).

Fixed-output variants like the TPS71730DCKTG4 integrate a precision voltage reference and include a dedicated NR (noise reduction) pin to filter bandgap noise via an external capacitor-enabling 30 µV_RMS output noise and improved PSRR above 10 kHz. The device includes undervoltage lockout (UVLO), thermal shutdown (160°C trip), and current limiting (≥200 mA).

Key Specifications

Pinout & Package

TPS71730DCKTG4 is housed in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for space-constrained portable applications. Thermal performance is characterized by R_θJA = 279.2°C/W (JEDEC high-K board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, low-dropout regulator applications.

Compared with TPL720F30PDBVR and MCP1700T-3002E/TT, the TPS71730DCKTG4 uniquely combines sub-30-µV_RMS noise, 70-dB PSRR at 1 kHz, and 170-mV dropout in a 2.0 × 1.25-mm footprint-making it the only option qualified for high-fidelity RF and precision analog biasing in space-constrained portable systems.

Availability

TPS71730DCKTG4 is available at Aetrix Electronics and suitable for camera sensor power, mobile phone baseband, wireless LAN transceivers, and PDA RF front-ends requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS71730DCKTG4 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 expertise in power management IC design.

The TPS717 family was engineered specifically for ultra-low-noise, high-PSRR regulation in battery-powered RF and precision analog systems-targeting camera modules, wireless handsets, and portable medical sensors where signal integrity is critical.

FAQ

What is the minimum input voltage required for TPS71730DCKTG4 to regulate at 3.0 V?

The TPS71730DCKTG4 requires a minimum input voltage of 2.5 V per specification, but practical regulation at full 150-mA load demands VIN ≥ VOUT + VDO = 3.0 V + 0.17 V = 3.17 V. At light loads, it can maintain regulation down to 2.5 V input, though dropout increases near the absolute minimum. Always verify headroom using the worst-case 300-mV dropout spec under temperature and process variation.

Does TPS71730DCKTG4 require an external noise reduction capacitor to achieve its specified 30 µV_RMS output noise?

Yes-the 30 µV_RMS (100 Hz–100 kHz) noise spec for TPS71730DCKTG4 is measured with a 0.01 µF ceramic capacitor on the NR pin. Without this capacitor, output noise rises to approximately 95 × VOUT µV_RMS (i.e., ~285 µV_RMS). The NR pin must be bypassed to GND with a low-leakage ceramic capacitor; X5R/X7R dielectrics are recommended.

Can TPS71730DCKTG4 be used with a 1-µF output capacitor, and is it stable across temperature and load?

Yes-TPS71730DCKTG4 is explicitly designed and tested for stability with a minimum 1-µF ceramic output capacitor (X5R/X7R), and this condition is guaranteed across –40°C to 125°C junction temperature and 0–150 mA load range. Larger capacitors improve transient response but are not required for stability.

What is the purpose of the NR pin on TPS71730DCKTG4, and how does it differ from the FB pin on adjustable LDOs?

The NR (Noise Reduction) pin on TPS71730DCKTG4 is exclusive to fixed-output versions and filters noise from the internal bandgap reference; it is not a feedback node. Unlike the FB pin on adjustable regulators-which sets output voltage via resistor divider-the NR pin accepts a capacitor to shunt high-frequency reference noise, directly lowering output spectral noise density and improving PSRR above 10 kHz.

How does the enable function behave during power sequencing, and what is the shutdown current of TPS71730DCKTG4?

The EN pin is active-high with V_EN(HIGH) ≥1.2 V (min) and V_EN(LOW) ≤0.4 V (max). When disabled, TPS71730DCKTG4 draws ≤1.5 µA shutdown current (at V_IN = 4.5–6.5 V), making it suitable for always-on monitoring circuits. Startup delay is minimized when VIN is applied before EN goes high-leveraging the internal quick-start circuit for ≤160 µs turn-on time.