Texas Instruments TPS75801KTTRG3

Overview

TPS75801KTTRG3 from Texas Instruments is an adjustable 3A low-dropout (LDO) voltage regulator with PMOS pass element, 1.22V internal reference, ±3% output accuracy over line/load/temperature, 150mV typical dropout at 3A, and thermal shutdown protection. It operates across –40°C to +125°C junction temperature and supports fast transient response in high-current power rails for FPGA core supplies and DSP voltage domains.

For engineers reviewing the TPS75801KTTRG3 datasheet, TPS75801KTTRG3 pinout, TPS75801KTTRG3 application, or TPS75801KTTRG3 equivalent, key selection criteria include adjustable output range (1.22V–5V), TO-263-5 package thermal performance (R_θJA = 38.7°C/W), enable-controlled shutdown (<1µA I_SHDN), and compatibility with ≥47µF output capacitors having ≥200mΩ ESR.

Technical Context

The TPS75801KTTRG3 uses a PMOS pass transistor architecture that delivers ultra-low dropout voltage directly proportional to load current and enables quiescent current independent of output loading (125µA typical across 1mA–3A). Its bandgap reference (1.224V typ) feeds a precision error amplifier controlling the pass device gate.

Functional blocks include undervoltage lockout (UVLO) with 2.2V turn-on threshold and 100mV hysteresis, current limiting (~10A peak), thermal shutdown at +150°C, and an integrated output discharge transistor (10–25mA). The FB pin accepts external resistor dividers for output programming while requiring minimal trace length to avoid noise coupling.

Key Specifications

Pinout & Package

TPS75801KTTRG3 is housed in a thermally enhanced DDPAK/TO-263-5 (KTT) surface-mount package with exposed thermal pad. The package features 5 terminals arranged in standard top-view pinout and supports solder-reflow assembly per JEDEC Level-2-260°C/1-year MSL rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS75801KTTRG3, TPS75801KTTR offers identical performance with minor packaging variation, while MIC29302WU trades off higher dropout and slower transient response for legacy design continuity - making TPS75801KTTRG3 optimal for new designs prioritizing efficiency and dynamic stability.

Availability

TPS75801KTTRG3 is available at Aetrix Electronics and suitable for industrial automation, medical imaging, and embedded DSP applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant surface-mount packaging.

Supply support for TPS75801KTTRG3 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 expertise in high-reliability linear regulators and power solutions.

The TPS758xx family was designed specifically for high-current, low-noise, fast-transient power delivery in FPGA, DSP, and ASIC core voltage applications - emphasizing thermal robustness, precision regulation, and ease of use in space-constrained layouts.

FAQ

What output voltage range does the TPS75801KTTRG3 support?

The TPS75801KTTRG3 is an adjustable LDO regulator supporting output voltages from 1.22V to 5V, set by an external resistor divider connected to the FB pin. Its internal 1.224V reference provides ±1% initial accuracy, and total output tolerance remains within ±3% across line, load, and temperature ranges per the datasheet's Electrical Characteristics table.

Does the TPS75801KTTRG3 require an output capacitor, and what are the minimum requirements?

Yes, the TPS75801KTTRG3 requires an output capacitor for loop stability. The minimum recommended value is 47µF with an equivalent series resistance (ESR) of at least 200mΩ. Ceramic, tantalum, and aluminum electrolytic capacitors are acceptable if they meet these specifications. Larger capacitance improves load transient response and widens the stable ESR range, as shown in Figure 21 of the datasheet.

How does the enable function work on the TPS75801KTTRG3?

The EN pin on the TPS75801KTTRG3 controls device operation: applying ≥2V enables regulation, while ≤0.7V places the device in shutdown mode with ground current reduced to <1µA at +25°C. The enable threshold includes 100mV hysteresis to prevent chatter near the transition point, and the EN pin draws less than 1µA in either state - simplifying interface with microcontroller GPIO or power sequencers.

What thermal performance can be expected from the TPS75801KTTRG3 in its TO-263 package?

In the TO-263-5 (KTT) package, the TPS75801KTTRG3 has a junction-to-ambient thermal resistance (R_θJA) of 38.7°C/W under JEDEC High-K board conditions with no heatsink. With a 2cm² copper ground plane and thermal vias, it can dissipate up to 2.4W at +55°C ambient and 150 LFM airflow - sufficient for 3A loads with ~0.8V input-output differential, as detailed in the Thermal Information section.

Is the TPS75801KTTRG3 pin-compatible with other members of the TPS758xx family?

Yes, all TPS758xx devices - including TPS75801KTTRG3, TPS75815KTTR, and TPS75833KTTR - share identical 5-pin TO-263 (KTT) pinout and footprint. This allows direct substitution between fixed-output and adjustable versions in the same layout, provided external feedback components are adjusted accordingly for the TPS75801KTTRG3's programmable configuration.