Texas Instruments TPS758A01KTTR

Overview

TPS758A01KTTR from Texas Instruments is an adjustable 3A low-dropout linear regulator with PMOS pass element, 1.24V reference voltage, 150mV typical dropout at 3A, and fast transient response optimized for high-current digital loads such as FPGAs and DSPs.

For engineers reviewing the TPS758A01KTTR datasheet, TPS758A01KTTR pinout, TPS758A01KTTR application, or TPS758A01KTTR equivalent, key selection criteria include output adjustability (1.22V–5V), thermal shutdown at +150°C, enable control with 2V threshold, and compatibility with 47µF+ output capacitors having ≥200mΩ ESR.

Technical Context

The TPS758A01KTTR implements a PMOS-based LDO architecture where dropout voltage scales linearly with load current and quiescent current remains stable at 125µA across 1mA–3A output range. Its bandgap reference (1.24V typ) feeds a precision error amplifier driving the gate of the PMOS pass transistor.

Enable functionality uses TTL-compatible thresholds (EN >2V enables; EN <0.7V disables), while internal protection includes current limiting (~10A peak), undervoltage lockout (2.2–2.75V with 100mV hysteresis), and thermal shutdown with automatic recovery at ~+130°C.

Key Specifications

Pinout & Package

TPS758A01KTTR is housed in a 5-pin DDPAK/TO-263 (KTT) surface-mount package with exposed thermal pad for enhanced heat dissipation. The package features 2°C/W junction-to-case thermal resistance and is rated for operation from –40°C to +125°C junction temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS758A01KTTR, TPS75733KTTR trades adjustability for simplified implementation in fixed-rail systems, while LT1963AES8#PBF offers lower quiescent current in a smaller package but sacrifices dropout performance and thermal robustness - making TPS758A01KTTR optimal for high-current, wide-input, thermally challenging applications.

Availability

TPS758A01KTTR is available at Aetrix Electronics and suitable for industrial automation, medical imaging, and automotive ADAS applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for TPS758A01KTTR 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 applications in FPGA, DSP, and ASIC core power domains - emphasizing thermal resilience, precision regulation, and ease of integration in dense PCB layouts.

FAQ

What is the minimum input voltage required for TPS758A01KTTR to regulate a 1.5V output?

The minimum input voltage for TPS758A01KTTR is determined by V_OUT + V_DO, where V_DO is typically 150mV at 3A. For a 1.5V output, VIN must be ≥1.65V. However, the absolute minimum VIN specification is 2.8V per datasheet - so the effective minimum is 2.8V regardless of V_OUT. This constraint ensures proper UVLO and internal circuit operation. TPS758A01KTTR cannot regulate below 2.8V input even at light loads.

How do I calculate the resistor values to set TPS758A01KTTR to 2.5V output?

To set TPS758A01KTTR to 2.5V, use the formula V_OUT = V_REF(1 + R1/R2), where V_REF = 1.24V. Select R2 = 30.1kΩ to achieve ~40µA divider current, then solve R1 = R2 × (V_OUT/V_REF − 1) = 30.1kΩ × (2.5/1.24 − 1) ≈ 38.3kΩ. Standard 1% values: R1 = 38.3kΩ, R2 = 30.1kΩ. TPS758A01KTTR's FB pin draws <1µA, minimizing divider error.

Does TPS758A01KTTR require an output capacitor, and what are the stability requirements?

Yes, TPS758A01KTTR requires an output capacitor for loop stability. The minimum is 47µF with ≥200mΩ ESR - verified across load (1mA–3A) and temperature (–40°C to +125°C). Ceramic, tantalum, and aluminum electrolytic types are acceptable if they meet these specs. Figure 18 shows stable regions: for 47µF, ESR must be ≥200mΩ; for 680µF, ESR may drop to 15mΩ. TPS758A01KTTR becomes unstable outside these bounds.

Can TPS758A01KTTR safely drive reverse current from output to input during power-down?

TPS758A01KTTR contains a built-in back diode in its PMOS pass transistor that conducts reverse current when V_IN < V_OUT, such as during system power-down. This current is not internally limited and can exceed safe levels if uncontrolled. To prevent damage, add an external Schottky diode from OUT to IN (cathode to IN) or use a load switch upstream. TPS758A01KTTR does not block reverse current - this behavior is inherent to its PMOS architecture.

What thermal derating applies to TPS758A01KTTR in a TO-263 package without a heatsink?

In a standard JEDEC High-K board (2S2P, 1-oz copper), TPS758A01KTTR's TO-263 package has R_ΘJA = 38.7°C/W. At +85°C ambient, maximum continuous power is (125°C − 85°C)/38.7°C/W ≈ 1.03W - corresponding to ~1.3A at 3.3V→1.2V drop. For 3A operation, a 2cm² copper pour tied to the thermal pad via vias is required (per Figure 26). Without it, TPS758A01KTTR will thermally shut down under full load.