Texas Instruments TPS40120PWR

Overview

TPS40120PWR from Texas Instruments is a VRM 10.x-compliant, 6-bit digitally programmable feedback divider IC designed to interface with multiphase controllers (e.g., TPS40090) having a 0.7-V internal reference. It supports 12.5-mV VID voltage steps across a 0.8375–1.600-V output range and features dual no-CPU signaling outputs (open-drain NCPU1 and TTL NCPU2) for safe power-down sequencing in Intel® Pentium® 4/Xeon™ processor power supplies.

For engineers reviewing the TPS40120PWR datasheet, TPS40120PWR pinout, TPS40120PWR application, or TPS40120PWR equivalent, this device is selected for precise core voltage regulation in multiphase CPU VRMs where dynamic VID code interpretation, anti-skew filtering (~500 ns), and controller-agnostic 0.7-V reference compatibility are required.

Technical Context

The TPS40120PWR implements a digitally controlled resistive feedback divider with fixed upper resistor and variable lower resistor determined by 6-bit VID inputs (VID0–VID5). Its BIAS pin accepts the controller's 0.7-V reference to improve tolerance tracking, while FB connects to the controller's error amplifier inverting input.

It provides two synchronized no-CPU outputs: NCPU1 (open-drain, used to discharge soft-start capacitors) and NCPU2 (push-pull TTL, used to disable gate drivers). VID input logic thresholds are specified at 0.3 V (low) and 0.85 V (high), with internal anti-skew filtering ensuring glitch-free transitions during VID code changes.

Key Specifications

Pinout & Package

TPS40120PWR is housed in a 14-pin TSSOP (PW) package, 5.0 mm × 4.4 mm footprint, 1.2 mm max height, RoHS-compliant, NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable feedback divider applications.

Compared with TPS40120PWR, the ISL6522CRZ offers matching VID resolution but omits integrated no-CPU outputs, increasing system-level complexity; the TPS40090 is not a substitute but a required partner controller-TPS40120PWR remains unique in its combined VID decoding and dual no-CPU signaling in a 14-pin TSSOP.

Availability

TPS40120PWR is available at Aetrix Electronics and suitable for Intel Pentium 4/Xeon VRM10.x power supplies, multiphase CPU voltage regulators, and legacy processor power upgrades requiring stable component supply and long-term lifecycle support.

Supply support for TPS40120PWR 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 power supply IC design.

The TPS40120PWR belongs to TI's VRM/EVRD power management product line, engineered specifically to simplify compliant core voltage regulation for Intel microprocessors using digital VID interfaces.

FAQ

What is the primary function of the TPS40120PWR in a CPU power supply?

The TPS40120PWR serves as a VRM 10.x-compliant, 6-bit digitally programmable feedback divider. It interprets VID codes from Intel Pentium 4 or Xeon processors and generates a precise reference voltage (0.8375–1.600 V in 12.5-mV steps) for the controller's error amplifier. The TPS40120PWR does not regulate power itself but enables accurate, dynamic core voltage control when paired with a multiphase controller such as the TPS40090.

Does the TPS40120PWR require an external microcontroller or firmware to operate?

No, the TPS40120PWR operates autonomously using only the 6-bit VID signals (VID0–VID5) from the CPU and a 0.7-V reference voltage applied to its BIAS pin. It contains no programmable memory or firmware-its behavior is fully defined by the VRM 10.x VID code table and internal analog divider architecture. The TPS40120PWR requires no configuration, initialization, or host processor interaction.

How do the NCPU1 and NCPU2 pins function in the TPS40120PWR?

When the VID code is set to "x11111" (OFF state), the TPS40120PWR asserts both NCPU1 and NCPU2. NCPU1 is an open-drain output used to discharge soft-start capacitors and initiate controlled output voltage ramp-down. NCPU2 is a push-pull TTL output that can directly drive gate driver enable/disable inputs to place the power stage in high-impedance mode. These outputs provide hardware-coordinated shutdown without software intervention.

Can the TPS40120PWR be used with controllers other than the TPS40090?

Yes-the TPS40120PWR is designed for interoperability with any multiphase controller featuring a 0.7-V internal reference voltage. It has been validated with the TPS40090 and TPS40130, but its BIAS, FB, and VOUT interface is generic. As long as the controller provides a stable 0.7-V reference and accepts a resistive feedback divider topology, the TPS40120PWR can be integrated without modification.

What is the significance of the anti-skew filtering in the TPS40120PWR VID inputs?

The TPS40120PWR incorporates ~500 ns of internal anti-skew filtering on all VID inputs to prevent metastability and transient glitches during simultaneous bit transitions. This ensures that voltage steps occur cleanly and predictably-even during rapid VID code changes-eliminating risk of undershoot, overshoot, or unstable regulation. The filtering is intrinsic to the TPS40120PWR and requires no external components.