Texas Instruments TPS386596L33DGKR

Overview

TPS386596L33DGKR from Texas Instruments is a quad-channel voltage supervisor IC that monitors four independent power rails-including one fixed 3.3-V rail (SENSE1) and three adjustable rails (SENSE2–4) down to 0.4 V-and asserts an open-drain active-low RESET signal when any monitored voltage drops below its threshold. It features 0.25% typical threshold accuracy, 50-ms fixed reset delay, and 7 µA typical quiescent current, enabling reliable power sequencing in FPGA, DSP, and multi-rail embedded systems.

For engineers reviewing the TPS386596L33DGKR datasheet, TPS386596L33DGKR pinout, TPS386596L33DGKR application, or TPS386596L33DGKR equivalent, key selection considerations include its 8-pin VSSOP package, manual reset (MR) input with internal 100-kΩ pullup, SENSE pin hysteresis behavior across temperature, and compatibility with DC-DC/LDO enable control and processor reset assertion.

Technical Context

The TPS386596L33DGKR implements four independent undervoltage comparators: SENSE1 uses an internal 2.90-V reference for direct 3.3-V rail monitoring, while SENSE2–4 accept externally resistor-divided inputs with trip points ≥0.4 V. All comparators feature 0.25% typical threshold accuracy and built-in hysteresis (25–72 mV for SENSE1; 3.5–10 mV for SENSE2–4) to prevent chatter during slow voltage transitions.

RESET assertion follows a logical OR of any SENSEn undervoltage event or MR low signal; deassertion requires all SENSEn > VITn and MR high, followed by a fixed 50-ms delay. The open-drain RESET output supports interface-level flexibility via external pullup (6.5 kΩ–10 MΩ), and operates over VDD = 1.8–6.5 V with guaranteed functionality above 0.9 V.

Key Specifications

Pinout & Package

TPS386596L33DGKR is housed in an 8-pin VSSOP (DGK) package measuring 5.00 mm × 3.00 mm, optimized for space-constrained PCB layouts in server, telecom, and industrial control applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6812HEUT+T and ADM1266ACPZ-RL7, the TPS386596L33DGKR delivers exact quad-channel supervision with minimal external components, industry-leading 0.25% threshold accuracy, and ultra-low 7-µA quiescent current-making it optimal for space- and power-constrained FPGA, DSP, and industrial embedded applications requiring deterministic reset timing.

Availability

TPS386596L33DGKR is available at Aetrix Electronics and suitable for FPGA power sequencing, DSP/MCU system reset, server board management, and industrial embedded controller applications requiring stable component supply and long-term lifecycle support.

Supply support for TPS386596L33DGKR 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 experience in high-reliability industrial and computing solutions.

The TPS386596 family was designed specifically for multi-rail power supervision in FPGA, ASIC, and microcontroller-based systems-delivering precision voltage monitoring, manual reset capability, and compact packaging for demanding embedded applications.

FAQ

What is the function of the MR pin on the TPS386596L33DGKR?

The MR (Manual Reset) pin on the TPS386596L33DGKR is an active-low input that forces the RESET output low regardless of SENSE pin voltages. It features an internal 100-kΩ pullup to VDD and 50-ns deglitching. When pulled low, it immediately asserts RESET; after release, RESET deasserts only after all SENSE inputs exceed their thresholds and a fixed 50-ms delay elapses. This enables system-level reset initiation by processors, watchdog timers, or front-panel buttons.

Can the TPS386596L33DGKR monitor voltages below 1.0 V?

Yes, the TPS386596L33DGKR can monitor voltages as low as 0.4 V on SENSE2, SENSE3, and SENSE4 pins using external resistor dividers. SENSE1 is fixed at 2.90 V for 3.3-V rails. For example, a 1.0-V rail can be scaled to 0.4 V using a 1.5:1 resistor ratio (e.g., 150 kΩ top, 100 kΩ bottom). The device maintains 0.25% typical threshold accuracy and 3.5–10 mV hysteresis across the full –40°C to 125°C range, ensuring reliable low-voltage supervision.

What is the recommended pullup resistor value for the RESET output of the TPS386596L33DGKR?

The RESET output of the TPS386596L33DGKR is open-drain and requires an external pullup resistor. Texas Instruments recommends values between 6.5 kΩ and 10 MΩ, with 100 kΩ commonly used to ensure VOL ≤ 0.4 V at 1 mA sink current. The pullup may connect to any voltage rail up to 6.5 V-enabling interface with 1.8-V, 3.3-V, or 5-V logic families. Smaller resistors improve noise immunity but increase static current; larger resistors reduce power but slow rise time.

Does the TPS386596L33DGKR require external components for SENSE1 monitoring?

No, the TPS386596L33DGKR requires no external components to monitor a 3.3-V nominal supply on SENSE1. Its internal 2.90-V threshold is factory-trimmed to 0.25% typical accuracy, allowing direct connection of the 3.3-V rail to Pin 4. A 1-nF to 10-nF bypass capacitor to GND is recommended at SENSE1 to suppress noise and layout-induced transients, but no resistor divider or reference circuitry is needed-unlike SENSE2–4, which require external dividers for adjustable thresholds.

How does temperature affect the voltage thresholds of the TPS386596L33DGKR?

The TPS386596L33DGKR maintains stable voltage thresholds across temperature: SENSE1 varies by ±12 mV (2.888–2.912 V) from –40°C to 125°C, while SENSE2–4 vary by ±2.5 mV (0.3975–0.4025 V) over the same range. Hysteresis also remains tightly controlled-25–72 mV for SENSE1 and 3.5–10 mV for SENSE2–4. These specifications are validated in the datasheet's typical characteristics plots (Figures 5–8), confirming suitability for automotive under-hood and industrial environments where thermal stability is critical.