Texas Instruments TPS70158PWP

Overview

TPS70158PWP from Texas Instruments is a dual-output low-dropout voltage regulator with programmable power-up sequencing, delivering fixed 3.3 V (500 mA) and 2.5 V (250 mA) outputs in a 20-pin HTSSOP PowerPAD™ package. It integrates open-drain PG1 (for VOUT1 monitoring), RESET (SVS/POR for VOUT2 + MR1/MR2), undervoltage lockout, thermal shutdown, and fast transient response - designed specifically for split-voltage DSP systems such as TMS320-based signal processors.

For engineers reviewing the TPS70158PWP datasheet, TPS70158PWP pinout, TPS70158PWP application, or TPS70158PWP equivalent, key selection criteria include sequencing control via SEQ pin, ±2% output accuracy over load/temperature, 170 mV typical dropout at 500 mA on Regulator 1, 65 mVRMS noise without bypass capacitor, and compatibility with low-ESR 10 µF ceramic output capacitors.

Technical Context

The TPS70158PWP uses PMOS pass transistors for both regulators, enabling ultra-low quiescent current (190 µA typ) independent of load and very low dropout (170 mV typ at 500 mA). Its internal architecture includes separate sense inputs (VSENSE1/FB1 and VSENSE2/FB2), independent enable (EN) and sequencing (SEQ) logic, and dual manual reset inputs (MR1, MR2) with 6 mA internal pull-up to VIN1.

Power-up sequencing is controlled by the SEQ pin: high or floating enables VOUT2 (2.5 V) to power up first, followed by VOUT1 (3.3 V) when VOUT2 reaches ~83% of regulation; pulling SEQ low reverses this order. RESET asserts low if VOUT2 drops below 95% VO or either MR1/MR2 is pulled low, with 120 ms delay and 30 ms rising-edge deglitch.

Key Specifications

Pinout & Package

TPS70158PWP is housed in a 20-pin HTSSOP (PowerPAD™) package (PWP), with exposed thermal pad on underside for enhanced heat dissipation. Package dimensions: 6.5 mm × 4.4 mm × 1.2 mm, pitch 0.65 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS70151PWP and TPS70258PWP, the TPS70158PWP offers optimal balance of fixed 3.3 V/2.5 V output matching, minimal pin count (20-pin), and integrated sequencing - making it the most direct fit for legacy TMS320 DSP designs requiring no layout change or additional supervision logic.

Availability

TPS70158PWP is available at Aetrix Electronics and suitable for TMS320 DSP power systems, FPGA core/I/O rail sequencing, and industrial signal processor modules requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for TPS70158PWP 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 high-reliability power solutions for DSP and real-time systems.

The TPS701xx family was engineered specifically to simplify power design for TI's TMS320 DSP platforms - integrating sequencing, supervision, low noise, and thermal robustness into a single IC to reduce system complexity and improve time-to-market.

FAQ

What output voltages does the TPS70158PWP provide?

The TPS70158PWP provides fixed 3.3 V output (Regulator 1, up to 500 mA) and fixed 2.5 V output (Regulator 2, up to 250 mA). These values are factory-trimmed and do not require external feedback resistors. The device belongs to the TPS701xx family, where the suffix "58" explicitly denotes the 3.3 V/2.5 V configuration - confirmed in TI's SLVS222I datasheet ordering table and electrical characteristics section.

How does the SEQ pin control power-up sequencing on the TPS70158PWP?

On the TPS70158PWP, the SEQ pin determines startup order: when pulled high or left floating, VOUT2 (2.5 V) powers up first and VOUT1 (3.3 V) activates only after VOUT2 reaches ~83% of regulation; pulling SEQ low reverses this, enabling VOUT1 first. An internal 6 mA pull-up to VIN1 ensures default VOUT2-first behavior if SEQ is unconnected - a key feature for TMS320 DSP compatibility as documented in the Functional Block Diagram and Pin Functions section of the datasheet.

What is the dropout voltage specification for the TPS70158PWP at full load?

The TPS70158PWP has a typical dropout voltage of 170 mV at 500 mA load on Regulator 1 (VOUT1 = 3.3 V), measured with VIN1 = 3.2 V and TJ = +25°C. Maximum dropout is 275 mV under same conditions. For Regulator 2 (VOUT2 = 2.5 V), dropout is not explicitly specified at 250 mA in the datasheet, but the architecture supports operation down to VIN2 = VO + 100 mV minimum - consistent with the 170 mV typical value for Regulator 1.

Does the TPS70158PWP require external bypass capacitors for stable operation?

No, the TPS70158PWP is stable with 10 µF low-ESR ceramic output capacitors and does not require additional bypass capacitors to achieve its specified 65 mVRMS noise performance. The datasheet explicitly states "65 mVRMS Without Bypass Capacitor" and confirms stability with 10 µF capacitors - a result of its PMOS pass element and internal compensation. Adding extra bypass caps may degrade transient response or cause instability per Application Information guidelines.

What supervisory functions are integrated into the TPS70158PWP?

The TPS70158PWP integrates PG1 (Power Good for VOUT1) and RESET (SVS/POR for VOUT2 + MR1/MR2) as open-drain outputs. PG1 goes high-impedance when VOUT1 reaches 95% of 3.3 V and asserts low on undervoltage; RESET goes high-impedance after 120 ms delay when VOUT2 ≥95% of 2.5 V and both MR1/MR2 are high - otherwise it remains low. Both outputs require external pull-up resistors per datasheet recommendations.