Texas Instruments TPS70458PWP

Overview

TPS70458PWP from Texas Instruments is a dual-output, low-dropout voltage regulator IC delivering fixed 3.3 V (1 A) and 2.5 V (2 A) outputs with integrated power-on reset (RESET), power-good (PG1/PG2), and independent enable inputs (EN1/EN2). It features 185 µA typical quiescent current, 160 mV dropout at 1 A on Regulator 1, and operates across –40°C to +125°C in split-voltage systems such as DSP/FPGA core-I/O power domains.

For engineers reviewing the TPS70458PWP datasheet, TPS70458PWP pinout, TPS70458PWP application, or TPS70458PWP equivalent, key selection considerations include dual-rail sequencing capability, ±2% output accuracy over load/temperature, 120-ms RESET delay, open-drain PG monitoring for both rails, and thermal shutdown protection in the HTSSOP-24 PowerPAD™ package.

Technical Context

The TPS70458PWP integrates two independent PMOS-based LDO regulators with separate input pins (VIN1/VIN2), enabling flexible power domain isolation. Each regulator uses internal voltage-sense feedback (VSENSE1/VSENSE2) tied to its respective output, supporting fast transient response (<10 µs recovery) with 47 µF low-ESR capacitors.

Its supervisory functions include an active-low open-drain RESET with 120-ms delay triggered after VIN1 exceeds 2.65 V UVLO threshold and MR pin release; PG1 and PG2 independently monitor VOUT1 and VOUT2 at 95% trip points with 30-ms deglitching and require external pull-up resistors.

Key Specifications

Pinout & Package

TPS70458PWP is housed in a 24-pin HTSSOP package (PWP) with exposed thermal pad (PowerPAD™) for enhanced heat dissipation. The package measures 7.8 mm × 4.4 mm × 1.2 mm and requires PCB copper pour under the pad per TI SLMA002 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS70451PWP and TPS70448PWP, the TPS70458PWP uniquely supports 2.5 V I/O standards (e.g., PCI-X, older FPGAs) while maintaining identical sequencing, supervision, and thermal characteristics-making it the optimal choice for legacy interface compatibility.

Availability

TPS70458PWP is available at Aetrix Electronics and suitable for industrial automation, telecommunications infrastructure, and embedded computing applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS70458PWP 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 precision voltage regulation and power integrity solutions.

The TPS704xx family was designed specifically for split-voltage digital systems-delivering dual, independently enabled LDOs with integrated power sequencing, reset, and monitoring to simplify power architecture in DSP, FPGA, and microprocessor applications.

FAQ

What are the exact output voltages and current capabilities of the TPS70458PWP?

The TPS70458PWP delivers fixed 3.3 V at up to 1 A on Regulator 1 and fixed 2.5 V at up to 2 A on Regulator 2. Both outputs maintain ±2% accuracy across –40°C to +125°C and full load range. The 3.3 V rail uses VIN1, while the 2.5 V rail uses VIN2-enabling independent input sourcing. Dropout is 160 mV typ at 1 A for Regulator 1, allowing operation from as low as 3.46 V input.

How does the RESET function operate on the TPS70458PWP, and what conditions trigger it?

The RESET pin on the TPS70458PWP is an active-low, open-drain output that asserts after a 120-ms delay when two conditions are met: VIN1 exceeds 2.65 V (UVLO threshold) and the MR pin is released (high-impedance or pulled high). RESET remains asserted if MR is pulled low or VIN1 drops below 2.4 V. An external pull-up resistor is required for proper logic-level operation.

Can the TPS70458PWP be used with different input voltages for each regulator, and what are the minimum input requirements?

Yes-the TPS70458PWP supports independent inputs: VIN1 (pins 2,3) for the 3.3 V regulator and VIN2 (pins 10,11) for the 2.5 V regulator. Minimum input is 2.7 V for VIN1 (to power internal bias) and VO + 1 V for each regulator-i.e., ≥4.3 V for VIN1 and ≥3.5 V for VIN2. Inputs up to 6 V are allowed, with dropout scaling linearly with load current.

What is the purpose of the VSENSE1 and VSENSE2 pins on the TPS70458PWP, and how should they be connected?

On the TPS70458PWP, VSENSE1 (pin 21) and VSENSE2 (pin 16) are voltage-sense inputs tied internally to the feedback network. For fixed-output operation, they must be connected directly to VOUT1 and VOUT2 respectively-using short, low-impedance traces. This Kelvin sensing improves regulation accuracy by rejecting PCB trace resistance effects and minimizing noise coupling into the error amplifier.

Does the TPS70458PWP include thermal protection, and what happens when it activates?

Yes, the TPS70458PWP includes thermal shutdown protection that activates at a junction temperature of +150°C. When triggered, both regulators shut down immediately to prevent damage. The device remains latched off until junction temperature falls below the hysteresis threshold (~140°C), at which point regulation resumes automatically-no external reset is required. This protects against sustained overload or poor heatsinking in compact enclosures.