Texas Instruments TPS70251PWP

Overview

TPS70251PWP from Texas Instruments is a dual-output low-dropout voltage regulator with fixed 3.3 V and 1.8 V outputs, integrated power-on reset (RESET), dual open-drain power-good (PG1/PG2), independent enable inputs (EN1/EN2), and thermal shutdown protection. It delivers up to 500 mA on Regulator 1 and 250 mA on Regulator 2, supporting split-voltage systems in DSP, FPGA, and microcontroller core/I/O power domains.

For engineers reviewing the TPS70251PWP datasheet, TPS70251PWP pinout, TPS70251PWP application, or TPS70251PWP equivalent, key selection considerations include dual independent enable control, 95% output voltage trip threshold for PG monitoring, 120 ms RESET delay, 170 mV typical dropout at 500 mA (Reg1), and HTSSOP-20 PowerPAD™ package thermal performance.

Technical Context

The TPS70251PWP integrates two PMOS-based LDO regulators with separate input rails (VIN1/VIN2), enabling flexible power sequencing and source isolation. Each regulator features internal voltage reference, error amplifier, and current-limit protection, with dedicated sense terminals (VSENSE1/VSENSE2) for precision feedback.

Its supervisory circuitry includes an undervoltage lockout (UVLO) at 2.4–2.65 V, a manual reset (MR) input with 6 μA internal pull-up, and open-drain RESET output with 120 ms delay. PG1 and PG2 independently monitor VOUT1 and VOUT2 at 95% nominal voltage with 0.5% hysteresis and 30 μs deglitching.

Key Specifications

Pinout & Package

TPS70251PWP is housed in a 20-pin HTSSOP (PWP) package with exposed thermal pad (PowerPAD™), optimized for thermal dissipation on 4-layer PCBs with recommended copper pour.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS70248PWP and TPS70258PWP, the TPS70251PWP uniquely matches 3.3 V I/O and 1.8 V core voltage requirements of ARM Cortex-M3/M4 and low-power FPGAs, offering optimal dropout and noise performance for this specific rail combination without layout or firmware changes.

Availability

TPS70251PWP is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and communications equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS70251PWP 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 over 90 years of innovation in power management ICs.

The TPS702xx product line was designed specifically for split-voltage digital systems requiring dual regulated rails, integrated power sequencing, and robust system-level supervision in space- and cost-constrained applications.

FAQ

What are the output voltage options supported by the TPS70251PWP?

The TPS70251PWP provides fixed 3.3 V output on Regulator 1 and fixed 1.8 V output on Regulator 2. These values are factory-trimmed and do not require external feedback resistors. The device belongs to the TPS702xx family, which also includes variants such as TPS70245 (3.3 V/1.2 V), TPS70248 (3.3 V/1.5 V), and TPS70258 (3.3 V/2.5 V), but the TPS70251PWP itself is strictly configured for 3.3 V/1.8 V operation per its datasheet specification and ordering code.

How does the RESET function operate in the TPS70251PWP?

The RESET output of the TPS70251PWP is an open-drain, active-low signal with a 120 ms (typ) delay after valid input voltage is applied. It asserts low during undervoltage conditions on VIN1 or when the MR pin is pulled low. The RESET pin goes high-impedance after the delay when MR is high and VIN1 exceeds the UVLO threshold (2.4–2.65 V). External pull-up is required, and RESET can be cascaded using PG1 or PG2 to monitor individual output rails.

Can the TPS70251PWP be used with ceramic output capacitors?

Yes, the TPS70251PWP is stable with 10 μF low-ESR ceramic capacitors on both outputs, as confirmed in the datasheet's stability region plots and recommended operating conditions. The device's PMOS architecture and internal compensation eliminate the need for high-ESR tantalum or aluminum electrolytic capacitors, enabling compact, high-reliability designs with standard X5R/X7R MLCCs.

What is the thermal performance of the TPS70251PWP in the PWP package?

The TPS70251PWP in the HTSSOP-20 PowerPAD™ (PWP) package achieves 3.067 W power dissipation at TA ≤ +25 °C with zero airflow, derating at 30.67 mW/°C. With 250 CFM airflow, dissipation increases to 4.115 W. Performance assumes the recommended 4-layer PCB layout with 1 oz. copper and 4-inch × 4-inch ground plane per TI technical brief SLMA002.

Does the TPS70251PWP support independent power sequencing between its two outputs?

Yes, the TPS70251PWP supports fully independent sequencing via separate EN1 and EN2 inputs. Pulling EN1 low enables only the 3.3 V regulator, while EN2 controls the 1.8 V regulator. This allows precise timing control-for example, enabling the 3.3 V I/O rail first, then asserting EN2 after PG1 confirms regulation, satisfying strict FPGA or microcontroller power-up sequences.