Texas Instruments TPS3514DR

Overview

TPS3514DR from Texas Instruments is a PC power-supply supervisor IC that provides over-voltage (OV), under-voltage (UV), and over-current (OC) protection for 12V, 5V, and 3.3V rails, plus power-good monitoring and fault-latched open-drain outputs. It features 300ms PGI-to-PGO delay, 75ms OCP enable delay, 2.3ms PSON-to-FPO turn-off delay, and operates from –40°C to +85°C in SOIC-14 package.

For engineers reviewing the TPS3514DR datasheet, TPS3514DR pinout, TPS3514DR application, or TPS3514DR equivalent, key selection criteria include its triple-rail OV/UV/OCP supervision, programmable OCP reference current (12.5–62.5 µA), open-drain FPO/PGO outputs with latch reset via PSON, and compatibility with ATX-style PC power supply control architectures.

Technical Context

The TPS3514DR integrates three independent OCP comparators supplied by VS12, each using an external sense resistor and a precision I(REF) sourced from the RI pin (1.15 V typical). Its UVLO circuit has asymmetric thresholds (4.45 V on, 3.65 V off) and disables under-voltage detection during PSON transitions to prevent false turn-on.

OVP and UVP functions use internal 150 µs debounce; fault conditions (OV, OC, or 12V UVP) assert FPO high (latched) and PGO low. PSON toggling from low-to-high resets the FPO latch, while PGI, VS33, and VS5 must exceed their respective UV thresholds before PGO asserts after 300 ms.

Key Specifications

Pinout & Package

TPS3514DR is housed in a 14-pin SOIC (D) package, 3.9 mm × 8.65 mm footprint, 1.75 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 PC power-supply supervision applications.

Compared with TPS3514DR, TPS3513DR removes 12V UVP but maintains full pin and functional compatibility for simpler PSUs, while UC2903N demands external circuitry for equivalent protection-making TPS3514DR the only single-chip solution supporting full ATX-compliant triple-rail OV/UV/OCP with latch and timing.

Availability

TPS3514DR is available at Aetrix Electronics and suitable for desktop PC power supplies, industrial ATX-compatible PSUs, server redundant power systems, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.

Supply support for TPS3514DR 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, delivering analog and embedded processing solutions for industrial, automotive, and computing markets.

The TPS3514DR belongs to TI's PC Power-Supply Supervisor family, engineered specifically for ATX-compliant power supply monitoring with integrated OV/UV/OCP, power-good timing, and fault latching-targeting reliability-critical PC and industrial power systems.

FAQ

What is the primary function of the TPS3514DR in a PC power supply?

The TPS3514DR serves as a dedicated PC power-supply supervisor IC that monitors 12V, 5V, and 3.3V rails for over-voltage, under-voltage, and over-current faults, generates a timed power-good signal (PGO), and provides a latched fault-protection output (FPO). Its design ensures ATX compliance through precise 300ms PGO delay, 75ms OCP enable timing, and PSON-controlled fault reset-making the TPS3514DR essential for safe, standards-conforming power delivery in desktop and industrial systems.

How does the TPS3514DR implement over-current protection across multiple voltage rails?

The TPS3514DR implements over-current protection using three dedicated sense inputs (IS12, IS5, IS33) and a programmable reference current (I_REF) sourced from the RI pin. An external resistor between RI and GND sets I_REF (12.5–62.5 µA), and each OCP comparator applies an 8× gain factor: I_{OCP_TRIP} = I_REF × 8 × R_SENSE / R_SHUNT. This architecture allows independent, scalable current limiting for 12V, 5V, and 3.3V rails using a single precision reference-enabling accurate overload detection without additional ICs in the TPS3514DR system.

What is the role of the PSON pin on the TPS3514DR, and how does it interact with fault recovery?

The PSON pin on the TPS3514DR is an active-low power-supply enable input that also serves as the fault latch reset mechanism. When a fault (OV, OC, or 12V UVP) occurs, FPO latches high and PGO goes low; this state persists until PSON transitions from low to high-a deliberate toggle that clears the latch and restores normal operation. The 38ms debounce on PSON prevents spurious resets from noise, and during PSON transitions, under-voltage detection is disabled to avoid turn-on failure. Thus, the TPS3514DR requires intentional user or controller action via PSON to recover from faults.

Can the TPS3514DR be used in applications outside of PC power supplies?

Yes, the TPS3514DR is applicable beyond PC power supplies in any system requiring coordinated multi-rail voltage and current supervision with deterministic fault handling. Its –40°C to +85°C rating, programmable OCP, and latched FPO make it suitable for industrial ATX-compatible PSUs, server redundant power units, and medical diagnostic equipment needing validated power sequencing. However, its fixed ATX-aligned timing (e.g., 300ms PGO delay) and 12V/5V/3.3V-specific thresholds mean custom timing or rail voltages require external circuitry-so the TPS3514DR excels where its native feature set matches the application's protection and timing profile.

What package type and thermal characteristics apply to the TPS3514DR?

The TPS3514DR is packaged in a 14-pin SOIC (D) with 3.9 mm × 8.65 mm footprint, 1.75 mm max height, and NIPDAU lead finish. Its thermal performance is characterized by a 956 mW power rating at +25°C, derating linearly at 7.65 mW/°C above that temperature to 497 mW at +85°C. The device draws ≤1 mA supply current and sources <1 mA from VS12, minimizing self-heating. This SOIC package supports standard reflow profiles (MSL Level-1, peak 260°C) and is optimized for compact, high-density PCB layouts common in modern power supply designs using the TPS3514DR.