Texas Instruments TPS3511DRG4

Overview

TPS3511DRG4 from Texas Instruments is a dedicated power-supply supervisor IC for PC ATX and industrial switching power supplies, providing overvoltage (12 V/5 V/3.3 V), undervoltage (5 V/3.3 V), fault latching, open-drain PGO and FPO outputs, and 150-ms power-good delay. It operates from 4 V to 15 V and supports –40°C to 125°C ambient temperature.

For engineers reviewing the TPS3511DRG4 datasheet, TPS3511DRG4 pinout, TPS3511DRG4 application, or TPS3511DRG4 equivalent, key selection criteria include its 150-ms PGI-to-PGO delay, 75-ms short-circuit turnon protection, 73-µs OVP noise deglitching, 2.3-ms PSON-to-FPO turnoff delay, and SOIC-8 package compatibility with legacy ATX motherboard control architectures.

Technical Context

The TPS3511DRG4 integrates independent voltage comparators for 12 V (via VDD), 5 V (VS5), and 3.3 V (VS33) overvoltage detection, plus dual thresholds for 5 V and 3.3 V undervoltage monitoring. Its internal 73-µs deglitch filter prevents false triggering on transient spikes.

A 150-ms programmable power-good delay timer initiates after all monitored rails exceed their UV thresholds; fault conditions latch FPO high until PSON toggles low→high. The 38-ms PSON debounce and 75-ms UV enable delay prevent spurious turnon during power sequencing.

Key Specifications

Pinout & Package

TPS3511DRG4 is housed in an 8-pin SOIC (D) package with 1.27-mm pitch, 3.91-mm body width, and 1.75-mm max height per JEDEC MS-012AA. Pin 1 is marked by a beveled corner or dot; device orientation follows standard SOIC top-view layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3511DRG4, TPS3510DR offers longer power-good delay but lacks extended temperature range, while UCC3917DG4 reduces feature set to basic 5-V monitoring - neither provides full 3.3 V/5 V/12 V supervision with latched fault response and PGI gating.

Availability

TPS3511DRG4 is available at Aetrix Electronics and suitable for ATX power supply design, industrial PSU redundancy control, server board power sequencing, and battery backup system handoff requiring stable component supply and long-lifecycle support.

Supply support for TPS3511DRG4 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 integrity solutions.

The TPS351x family was designed specifically for ATX and industrial switching power supplies to replace discrete supervision circuits with integrated, timing-accurate, multi-rail voltage monitoring and fault latching.

FAQ

What is the power-good delay of the TPS3511DRG4, and how does it differ from the TPS3510DR?

The TPS3511DRG4 has a fixed 150-ms power-good delay from PGI rise to PGO assertion, whereas the TPS3510DR uses a 300-ms delay. This difference directly impacts motherboard compatibility: systems requiring faster PGO response after power-on must use TPS3511DRG4, while those aligned with legacy 300-ms specifications may use TPS3510DR. Both devices share identical pinout and functional architecture outside the delay timer.

How does the TPS3511DRG4 detect 12-V overvoltage without a dedicated VS12 pin?

The TPS3511DRG4 monitors 12-V overvoltage through the VDD pin - the same pin that supplies operating power. When VDD exceeds 13.2–14.4 V, the internal comparator triggers OVP and asserts FPO high. This dual-use design eliminates the need for a separate 12-V sense input, simplifying PCB routing while maintaining accurate 12-V fault detection critical for ATX compliance.

Can the TPS3511DRG4 be used in systems requiring operation above 85°C ambient?

Yes - the TPS3511DRG4 is characterized for continuous operation from –40°C to 125°C, making it suitable for high-temperature industrial and server environments where the TPS3510DR (–40°C to 85°C) would fail. This extended rating is confirmed in TI's official packaging addendum and absolute maximum ratings table, and applies to all SOIC-8 variants including TPS3511DRG4.

What happens to the FPO output during a short-circuit condition at power-on?

During short-circuit power supply turnon, the TPS3511DRG4 applies a 75-ms delay before enabling undervoltage protection on VS5 and VS33. This prevents false FPO assertion caused by slow-rising rails under heavy short-circuit loads. If UV persists beyond 146 µs after the 75-ms window, FPO latches high and remains asserted until PSON toggles low→high - ensuring reliable fault capture without nuisance tripping.

Is the TPS3511DRG4 pin-compatible with other members of the TPS351x family?

Yes - the TPS3511DRG4 shares identical SOIC-8 pinout, terminal functions, and electrical interface with TPS3510DR and TPS3510D. All devices use the same PGI, GND, FPO, PSON, PGO, VDD, VS5, and VS33 pin assignments. This allows drop-in replacement for delay or temperature-range upgrades, provided the host system's timing and thermal requirements align with the selected variant.