Texas Instruments TPS3514N

Overview

TPS3514N 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 open-drain power-good (PGO) and fault-protection (FPO) outputs. It features 300ms PGO delay, 75ms OC enable delay, programmable OCP via RI pin (12.5–62.5µA), and operates from –40°C to +85°C in DIP-14 package.

For engineers reviewing the TPS3514N datasheet, TPS3514N pinout, TPS3514N application, or TPS3514N equivalent, key selection criteria include its triple-rail OV/UV/OCP monitoring, latched FPO with PSON reset, 300ms power-good timing, and compatibility with ATX-style PC power supply control architectures requiring robust fault detection and sequencing.

Technical Context

The TPS3514N integrates three independent voltage comparators for OV/UV detection on VS12, VS5, and VS33 inputs, plus three dedicated OCP comparators fed by IS12/IS5/IS33 current-sense inputs. Its UVLO threshold is fixed at 4.45V (on) / 3.65V (off), and it uses internal 1.15V bandgap reference with 150µs noise deglitching on UVP paths.

OCP trip points are programmable via external resistor between RI and GND, setting I(REF) to scale OCP thresholds (e.g., 9.2A on 12V rail with 56kΩ). The FPO output is latched high during any OV, UV, or OC fault and resets only upon PSON low-to-high transition or VDD removal - not automatic recovery.

Key Specifications

Pinout & Package

TPS3514N is housed in a 14-pin plastic dual in-line package (PDIP-N), 0.300" wide, with through-hole mounting and standard DIP footprint. Pin 1 is marked by notch or dot; leads are tin-lead (NIPDAU) finish, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PC power-supply supervisor applications.

Compared with TPS3514N, TPS3513N removes 12V OCP capability but retains full voltage supervision and timing, while UC2903N offers only basic OV/UV detection without current monitoring or latched fault signaling - making TPS3514N uniquely suited for full-featured ATX-compliant protection.

Availability

TPS3514N is available at Aetrix Electronics and suitable for ATX power supplies, industrial multi-rail PSUs, server power management modules, and legacy PC board replacements requiring stable component supply and long-lifecycle support.

Supply support for TPS3514N 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 TPS3514N belongs to TI's PC Power-Supply Supervisor product line, designed specifically to replace discrete protection circuits in ATX and SFX power supplies with integrated, configurable, and standards-compliant monitoring.

FAQ

What is the function of the RI pin on the TPS3514N?

The RI pin on the TPS3514N serves as the reference current source for over-current protection. Connecting an external resistor between RI and GND sets I(REF) from 12.5µA to 62.5µA, which scales the trip points of all three OCP comparators (IS12, IS5, IS33). This allows precise, rail-specific current limiting without additional op-amps or DACs - a core design feature of the TPS3514N.

Does the TPS3514N provide under-voltage protection on all three rails (12V, 5V, 3.3V)?

No. The TPS3514N provides under-voltage protection (UVP) only on the 12V rail (via VS12), with thresholds of 8.5V (min) to 9.5V (max). It provides under-voltage *detection* (UVD) on 5V and 3.3V rails - used solely for power-good qualification, not fault latching. Only 12V UVP triggers FPO assertion; 5V/3.3V UV events alone do not cause fault lockout in the TPS3514N.

How does the TPS3514N handle fault reset, and is automatic recovery supported?

TPS3514N does not support automatic fault recovery. When an OV, UV, or OC condition occurs, FPO latches high and PGO goes low. Recovery requires toggling PSON from low to high - a deliberate system-level action. Removing VDD also clears the latch. This behavior ensures faults are acknowledged before resuming operation, a critical safety feature built into the TPS3514N's architecture.

What is the maximum sink current capability of the PGO and FPO outputs on the TPS3514N?

The PGO output of the TPS3514N supports up to 10mA sink current with a low-level output voltage ≤0.4V at VDD = 4.5V. The FPO output supports up to 20mA sink current with VOL ≤0.7V at VDD = 5V. Both are open-drain and require external pull-up resistors; these ratings define the minimum pull-up strength needed to maintain logic-low voltage under full load - essential for driving downstream logic or optocouplers in the TPS3514N application.

Can the TPS3514N be used in new designs given its NRND status?

Yes - the TPS3514N remains available for new designs through Aetrix Electronics with full traceable sourcing and lifecycle coordination. Although marked NRND (Not Recommended for New Designs) by TI due to portfolio rationalization, it is actively produced, RoHS-compliant, and supported with full documentation. Its mature, proven architecture makes it suitable for cost-sensitive, long-lifecycle industrial and legacy-compatible applications where the TPS3514N's specific feature set remains optimal.