Texas Instruments TPS40120PW

Overview

TPS40120PW 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, features dual NCPU outputs for no-CPU state signaling, and operates from a 4.3–5.5-V VCC supply. It enables dynamic core voltage scaling in Intel Pentium 4/Xeon processor power supplies.

For engineers reviewing the TPS40120PW datasheet, TPS40120PW pinout, TPS40120PW application, or TPS40120PW equivalent, key selection considerations include VRM 10.x VID code compatibility, FB-to-VOUT divider accuracy (±0.5%), BIAS reference injection capability, NCPU1 open-drain and NCPU2 TTL-level output behavior, and TSSOP-14 package thermal and layout constraints.

Technical Context

The TPS40120PW implements a digitally controlled resistive feedback divider where the upper resistor is fixed and the lower resistor value is determined by a 6-bit VID code, enabling precise VREF generation per VRM 10.x specifications. Its BIAS pin injects the controller's 0.7-V reference into the divider network to improve tolerance against reference drift.

It integrates anti-skew filtering (~500 ns) on all VID inputs to prevent erroneous voltage transitions during dynamic VID code changes, supporting smooth 12.5-mV step-up/down transitions at rates up to 2.5 mV/µs. The NCPU1 (open-drain) and NCPU2 (TTL push-pull) outputs assert low upon VID = x11111, enabling coordinated power-down sequencing in multiphase CPU VRMs.

Key Specifications

Pinout & Package

TPS40120PW is housed in a 14-pin TSSOP (PW) package with 0.65-mm lead pitch, 4.4-mm body width, and 1.2-mm maximum height. The package is RoHS-compliant, moisture-sensitivity Level-1 rated, and suitable for standard reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS40120PW, TPS40090 integrates control logic but eliminates design flexibility, while ISL6540CRZ offers functional overlap in VID decoding but omits NCPU1/NCPU2 coordination-making TPS40120PW uniquely suited for systems requiring synchronized multi-output no-CPU signaling.

Availability

TPS40120PW is available at Aetrix Electronics and suitable for Intel VRM10.x power supplies, multiphase CPU voltage regulators, and dynamic VID-based core voltage scaling applications requiring stable component supply and long-term industrial availability.

Supply support for TPS40120PW 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies.

The TPS40120PW belongs to TI's VRM-compliant power management IC product line, engineered specifically to simplify and enhance the accuracy of programmable voltage regulation in Intel processor power delivery systems.

FAQ

What is the primary function of the TPS40120PW in a CPU power supply?

The TPS40120PW serves as a VRM 10.x-compliant, 6-bit digitally programmable feedback divider that generates precise reference voltages (0.8375–1.600 V in 12.5-mV steps) from VID codes sent by Intel Pentium 4/Xeon processors. It interfaces between the VRM output and the controller's FB pin, replacing discrete resistor networks to enable dynamic core voltage scaling. Its BIAS pin allows injection of the controller's 0.7-V reference to improve accuracy, and it is integral to the TPS40120PW-based power architecture.

How does the TPS40120PW handle VID code transitions to prevent voltage glitches?

The TPS40120PW incorporates internal anti-skew circuitry with approximately 500 ns of filtering on all VID inputs (VID0–VID5), ensuring that asynchronous or noisy VID code changes do not produce erroneous VREF values. This filtering supports clean 12.5-mV upward/downward transitions at rates up to 2.5 mV/µs without external synchronization logic. The TPS40120PW thus maintains stable regulation during dynamic voltage scaling events such as processor frequency changes or thermal throttling.

What is the role of the NCPU1 and NCPU2 pins on the TPS40120PW?

NCPU1 (Pin 12) is an open-drain output that asserts low when VID = x11111 (no-CPU state), commonly used to discharge soft-start capacitors or disable bias circuits. NCPU2 (Pin 13) is a TTL-level push-pull output that also asserts low under the same condition, enabling direct control of gate drivers to place the VRM output in high-impedance shutdown. Together, they provide coordinated, robust no-CPU signaling - a key feature distinguishing the TPS40120PW from simpler VID dividers.

Can the TPS40120PW be used with controllers other than the TPS40090?

Yes, the TPS40120PW is compatible with any multiphase or single-phase PWM controller featuring a 0.7-V internal reference and FB-based voltage regulation, provided the controller supports external VID decoding or delegates VID interpretation to the TPS40120PW. It has been validated with TPS40090, TPS40130, and similar architectures. The TPS40120PW's BIAS pin allows reference injection even if the controller's reference exhibits tolerance drift, enhancing interoperability across compatible platforms.

What package type and assembly details apply to the TPS40120PW?

The TPS40120PW uses a 14-pin TSSOP (PW) package with 0.65-mm lead pitch, 4.4-mm body width, and 1.2-mm maximum height. It is RoHS-compliant, moisture-sensitivity Level-1 rated (260°C peak reflow, unlimited floor life), and supplied in tubes (90 pcs) or tape-and-reel (2000 pcs). The pin 1 index area is marked "40120", and recommended PCB land patterns follow IPC-7351 guidelines for PW0014A outline - critical for solder joint reliability in the TPS40120PW's thermal and electrical performance.