Texas Instruments TPS386000RGPT

Overview

TPS386000RGPT from Texas Instruments is a quad supply voltage supervisor IC with adjustable delay and watchdog timer, featuring four independent monitoring channels (including one window comparator for channel 4), 0.25% typical threshold accuracy, 11 μA typical quiescent current, and open-drain RESET/WDO outputs - used in FPGA power sequencing and DSP reset management.

For engineers reviewing the TPS386000RGPT datasheet, TPS386000RGPT pinout, TPS386000RGPT application, or TPS386000RGPT equivalent, key selection criteria include programmable 1.4 ms–10 s reset delays per channel, support for negative voltage sensing via SENSE4L/SENSE4H + VREF, manual reset input (MR), and watchdog timeout at 600 ms (typical).

Technical Context

The TPS386000RGPT implements four independent supervisory circuits (SVS-1 to SVS-4), each with user-programmable undervoltage thresholds down to 0.4 V using external resistor dividers on SENSE pins. SVS-4 uses dual comparators for window monitoring (SENSE4L for falling edge, SENSE4H for rising edge) and supports negative rail sensing when paired with the 1.2 V VREF output.

Each channel's reset delay is independently set via CTn pins using either fixed resistor values (for 14–375 ms nominal delays) or external capacitors (enabling 1.4 ms–10 s range). The integrated watchdog timer monitors WDI transitions with 600 ms (typ) timeout and asserts WDO - an open-drain output requiring external pull-up.

Key Specifications

Pinout & Package

TPS386000RGPT is housed in a 4.00 mm × 4.00 mm, 20-pin VQFN package (RGP) with exposed thermal pad connected to GND. Pin 11 (NC) must be tied to GND per TI recommendation; thermal pad requires solid GND connection for thermal performance and EMI control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage supervisor applications.

Compared with TPS386040RGPT, TPS386000RGPT offers greater interface flexibility via open-drain outputs but requires external pull-ups; versus MAX6804HEUK+T, it delivers full quad supervision, adjustable delays, watchdog, and negative rail capability - making it suitable for complex, high-reliability systems where TPS386000RGPT's feature set justifies its higher integration level.

Availability

TPS386000RGPT is available at Aetrix Electronics and suitable for FPGA power sequencing, DSP reset management, industrial PLC controller monitoring, and telecom line card supervision requiring stable component supply across extended temperature ranges (–40°C to +125°C).

Supply support for TPS386000RGPT 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 high-reliability supervisory ICs.

The TPS386000RGPT belongs to TI's precision voltage supervisor product line, designed specifically for complex multi-rail systems requiring independent, accurate, and configurable power monitoring - especially in FPGA, DSP, and telecom infrastructure applications.

FAQ

What is the function of the VREF pin on the TPS386000RGPT?

The VREF pin on the TPS386000RGPT provides a stable 1.20 V (±20 mV) reference output used exclusively to source current into external resistor networks. It enables negative voltage rail monitoring when connected to SENSE4H and a negative supply - for example, configuring a –1.2 V threshold by tying SENSE4H to the negative rail through a matched resistor divider. Do not sink current into VREF or connect it to voltages above 1.2 V.

How does the TPS386000RGPT implement window monitoring on Channel 4?

The TPS386000RGPT implements window monitoring on Channel 4 using two dedicated inputs: SENSE4L monitors falling voltage (undervoltage threshold), and SENSE4H monitors rising voltage (overvoltage threshold). When SENSE4L drops below its 400 mV (typ) threshold, RESET4 asserts; when SENSE4H exceeds its 400 mV (typ) threshold, RESET4 also asserts - creating a dead band between them. This dual-comparator architecture allows detection of both under- and overvoltage faults on a single rail.

Can the TPS386000RGPT monitor a negative voltage rail such as –5 V?

Yes, the TPS386000RGPT can monitor a negative voltage rail like –5 V by using the VREF pin (1.2 V) and SENSE4H input. Connect VREF to one end of a resistor divider, the other end to the negative rail, and the midpoint to SENSE4H. With appropriate resistor scaling, this creates a positive voltage at SENSE4H proportional to the magnitude of the negative rail - enabling detection of –5 V drop below threshold. SENSE4L remains unused in this configuration.

What is the minimum pulse width the TPS386000RGPT requires on its SENSE inputs to trigger a reset?

The TPS386000RGPT requires a minimum SENSE input pulse width of 4 μs (typical) to reliably trigger a reset event. This specification applies to all SENSE inputs (SENSE1–SENSE4L/H) and ensures robust operation in electrically noisy environments - such as industrial motor drives or telecom line cards - where short transients could otherwise cause spurious resets. Pulse width is measured at 10% overdrive relative to threshold voltage.

Does the TPS386000RGPT require external components to operate its watchdog timer?

No, the TPS386000RGPT watchdog timer operates autonomously with no external timing components required. Its 600 ms (typ) timeout period is internally generated and triggered by edges on the WDI pin - either rising or falling. To prevent timeout, the host processor must toggle WDI at least once every 600 ms. The WDO output reflects timer status and is open-drain, requiring only an external pull-up resistor for logic-level compatibility.