Texas Instruments TPS70751PWP

Overview

TPS70751PWP from Texas Instruments is a dual-output, low-dropout voltage regulator IC designed for split-voltage DSP power management. It delivers fixed 3.3V/1.8V outputs with 250mA on Regulator 1 and 125mA on Regulator 2, ultralow 190µA quiescent current, 65µVRMS output noise without bypass capacitors, and programmable power-up sequencing via the SEQ pin - enabling robust TMS320™ DSP core/I/O rail startup in embedded signal processing systems.

For engineers reviewing the TPS70751PWP datasheet, TPS70751PWP pinout, TPS70751PWP application, or TPS70751PWP equivalent, key selection criteria include sequencing control logic (SEQ pin behavior), dual independent reset monitoring (PG1 and RESET open-drain outputs), ±2% output accuracy over load/temperature, thermal shutdown protection, and compatibility with 10µF low-ESR ceramic output capacitors.

Technical Context

The TPS70751PWP integrates two PMOS-based LDO regulators with separate input pins (VIN1/VIN2), enabling independent sourcing of core and I/O rails. Its sequencing architecture uses an internal 6µA pull-up on the SEQ pin to determine power-up order: high or floating SEQ enables VOUT2 (1.8V) to ramp first, followed by VOUT1 (3.3V) at ~83% of regulation; low SEQ reverses this sequence.

Each regulator features dedicated sensing (VSENSE1/FB1 and VSENSE2/FB2), undervoltage lockout (UVLO at 2.4–2.65V on VIN1), and fast transient response stabilized with ≥10µF ceramic capacitors. The RESET output monitors VOUT2 and MR1/MR2 with 120ms delay and 95% trip threshold, while PG1 independently monitors VOUT1 status.

Key Specifications

Pinout & Package

TPS70751PWP is housed in a 20-pin PowerPAD™ HTSSOP (PWP) package with exposed thermal pad for enhanced heat dissipation. The package supports surface-mount assembly and requires PCB copper pour under the PowerPAD for optimal thermal performance 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 TPS70758PWP and TPS70802PWP, the TPS70751PWP uniquely balances fixed 3.3V/1.8V output alignment with single-pin sequencing and lowest quiescent current (190µA), making it optimal for cost-sensitive, space-constrained DSP designs where I/O voltage is standardized at 1.8V.

Availability

TPS70751PWP is available at Aetrix Electronics and suitable for DSP power sequencing, FPGA configuration, and low-power edge AI accelerator applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS70751PWP 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 industrial, automotive, and communications markets.

The TPS707xx product line was engineered specifically for TMS320 DSP power integrity - integrating sequencing, reset supervision, and low-noise regulation into a single IC to eliminate discrete supervisory components and simplify split-rail system design.

FAQ

What is the recommended input voltage range for TPS70751PWP?

The TPS70751PWP requires VIN1 ≥ 2.7V (minimum for 3.3V output) and VIN2 ≥ 2.8V (minimum for 1.8V output), with absolute maximum ratings of 7V on all inputs. For optimal dropout performance, VIN1 should be ≥ 3.3V + VDO (≥3.383V typical), and VIN2 ≥ 1.8V + VDO (≥1.883V typical). Operation outside these ranges risks UVLO activation or regulation loss.

How does the SEQ pin control power-up order in TPS70751PWP?

In TPS70751PWP, the SEQ pin determines sequencing: when pulled high or left floating (via internal 6µA pull-up), VOUT2 (1.8V) ramps first and VOUT1 (3.3V) activates only after VOUT2 reaches ~83% of regulation; pulling SEQ low reverses this, enabling VOUT1 first. This behavior is confirmed in the device's functional block diagram and timing diagrams (Figures 36–40).

Can TPS70751PWP operate without external bypass capacitors?

Yes - TPS70751PWP achieves 65µVRMS output noise without any bypass capacitor due to its internal PMOS architecture and optimized compensation. However, a minimum 10µF ceramic output capacitor is still required for stability across load and temperature; omitting it causes oscillation and regulation failure.

What is the function of the PG1 and RESET pins on TPS70751PWP?

PG1 is an open-drain output indicating VOUT1 (3.3V) status: high-impedance when ≥95% of 3.3V, low when below. RESET is also open-drain but monitors VOUT2 (1.8V) and MR1/MR2, asserting low on undervoltage or manual reset, with a fixed 120ms delay. Both require external pull-up resistors to function correctly in the system.

Does TPS70751PWP support thermal shutdown, and what is the trip point?

Yes, TPS70751PWP includes thermal shutdown protection that activates at +150°C junction temperature. The device latches off until junction temperature falls below hysteresis threshold (~140°C), preventing damage during sustained overload or inadequate PCB heatsinking. This is specified in the Electrical Characteristics table and validated across –40°C to +125°C operating range.