Texas Instruments TPS78630KTTT

Overview

TPS78630KTTT from Texas Instruments is a fixed-output 3.0-V, 1.5-A low-dropout linear regulator with ultralow noise (48 µV_RMS), high PSRR (49 dB at 10 kHz), and fast start-up (110 µs with 0.01 µF NR capacitor). It uses a PMOS pass device, operates from 2.7 V to 5.5 V input, and delivers stable regulation for RF analog signal chains in portable wireless systems.

For engineers reviewing the TPS78630KTTT datasheet, TPS78630KTTT pinout, TPS78630KTTT application, or TPS78630KTTT equivalent, key selection criteria include dropout voltage at full load (390 mV), noise performance under 100 Hz–100 kHz bandwidth, NR-capacitor-dependent start-up timing, and thermal derating in TO-263-5 package with exposed tab.

Technical Context

The TPS78630KTTT implements a PMOS-based LDO architecture with internal 1.225-V bandgap reference, UVLO (2.25 V threshold), and integrated quickstart circuitry. Its noise-reduction (NR) pin connects via a 250-kΩ internal resistor to the reference node, enabling external RC filtering of reference noise.

Protection features include current limiting (~2.8 A), thermal shutdown (~165°C), and reverse-current conduction via the intrinsic body diode. Enable logic is CMOS-compatible: high (>1.7 V) enables regulation; low (<0.7 V) reduces quiescent current to 0.07 µA.

Key Specifications

Pinout & Package

TPS78630KTTT is housed in a TO-263-5 (KTT) thermally enhanced package with exposed metal tab electrically connected to GND. The 10.16 mm × 8.42 mm body supports high-power dissipation when soldered to PCB copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL7407LPGEDR (non-regulator) and TPS79630DRBR (higher-performance SON variant), TPS78630KTTT offers proven thermal reliability in TO-263 for sustained 1.5-A loads, lower cost in volume, and mature qualification for industrial temperature range - making it optimal for cost-sensitive, thermally demanding embedded RF platforms.

Availability

TPS78630KTTT is available at Aetrix Electronics and suitable for RF transceiver modules, portable medical sensors, and industrial IoT gateways requiring stable component supply with long-term manufacturability and extended temperature support.

Supply support for TPS78630KTTT 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs and high-reliability signal-chain solutions.

The TPS786 family was designed specifically for noise-sensitive RF and precision analog applications, emphasizing ultralow output noise, high PSRR across 10 Hz–1 MHz, and fast transient response in thermally robust packages.

FAQ

What is the maximum input voltage rating for TPS78630KTTT?

The absolute maximum input voltage for TPS78630KTTT is 6 V. However, the recommended operating range is 2.7 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate safe operating area limits, especially under high ambient temperatures or heavy load conditions. Always maintain VIN ≤ 5.5 V in production designs using TPS78630KTTT.

Does TPS78630KTTT require an external feedback resistor network?

No, TPS78630KTTT is a fixed-output 3.0-V regulator and does not use an external feedback divider. Its FB pin is internally connected and unused; the NR pin serves only for noise filtering. Unlike the adjustable TPS78601, TPS78630KTTT has no FB terminal functionality - all regulation is handled internally to deliver precise 3.0 V ±2%.

How does the NR capacitor value affect TPS78630KTTT performance?

The NR capacitor on TPS78630KTTT sets a trade-off between output noise and start-up time. A 0.1 µF capacitor achieves 48 µV_RMS noise but yields ~110 µs start-up; reducing to 0.01 µF raises noise to 49 µV_RMS while cutting start-up to ~75 µs. Capacitors >0.1 µF are not recommended - they delay start-up excessively and risk incomplete charging during quickstart activation in TPS78630KTTT.

Can TPS78630KTTT operate with a 1-µF output capacitor?

Yes, TPS78630KTTT is explicitly characterized and guaranteed stable with ≥1 µF ceramic output capacitance, unlike many legacy LDOs requiring ≥10 µF. This enables compact, low-BOM designs. For best transient response and PSRR, TI recommends ≥2.2 µF X7R/X5R ceramics placed close to the OUT and GND pins of TPS78630KTTT.

What thermal derating applies to TPS78630KTTT at 125°C ambient?

At 125°C ambient, TPS78630KTTT's maximum sustainable output current drops significantly due to its R_θJA = 40.7°C/W. With 5.5 V input and 3.0 V output, power dissipation is (5.5−3.0)×I_OUT. To stay below 125°C junction limit, I_OUT must be ≤ ~0.9 A - verified via T_J = T_A + P_D×R_θJA. Full 1.5-A operation requires ≤85°C ambient or enhanced PCB copper area for TPS78630KTTT.