Texas Instruments TPS3808G15DBVTG4

Overview

TPS3808G15DBVTG4 from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 1.5 V system rails and assert an open-drain RESET signal upon undervoltage or manual reset. It delivers 0.5% threshold accuracy (V_IT = 1.40 V), 2.4 μA typical supply current, and user-adjustable delay from 1.25 ms to 10 s via external capacitor on CT pin. It operates across –40°C to 125°C and is used in FPGA power sequencing and battery-powered microcontroller systems.

For engineers reviewing the TPS3808G15DBVTG4 datasheet, TPS3808G15DBVTG4 pinout, TPS3808G15DBVTG4 application, or TPS3808G15DBVTG4 equivalent, key selection criteria include its fixed 1.40 V threshold for 1.5 V rails, SOT-23-6 package compatibility, open-drain RESET output with 0.4 V max VOL at 1 mA, and support for manual reset assertion with internal 90 kΩ pull-up on MR.

Technical Context

The TPS3808G15DBVTG4 implements a precision voltage comparator with built-in hysteresis (1%–2.5% of V_IT) and an on-chip 220 nA current source that charges the external CT capacitor to set delay time. Its SENSE input monitors rail voltage directly, while MR provides asynchronous reset control independent of supply monitoring.

RESET assertion is triggered by either SENSE falling below 1.40 V or MR pulled low; de-assertion requires both SENSE > V_IT + V_HYS and MR high, followed by the full programmed delay. The device uses a precision reference for ±0.5% threshold accuracy over –40°C to 85°C and supports VDD from 1.7 V to 6.5 V.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with TPS3808G15DBVTG4, TPS3808G15DBVR offers identical functionality in volume-friendly packaging, while MAX6326UT15+T trades programmability and MR support for smaller footprint and lower quiescent current-making it viable only in constrained, fixed-timing applications.

Availability

TPS3808G15DBVTG4 is available at Aetrix Electronics and suitable for FPGA power sequencing, portable microcontroller systems, automotive body control modules, and industrial PLC I/O cards requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for TPS3808G15DBVTG4 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 delivering analog and embedded processing solutions, with deep expertise in power management, signal chain, and real-time control ICs.

The TPS3808 family was engineered specifically for high-accuracy, low-power system supervision in space-constrained and battery-sensitive applications-emphasizing precision thresholding, flexible timing, and wide-temperature reliability.

FAQ

What is the exact threshold voltage of the TPS3808G15DBVTG4?

The TPS3808G15DBVTG4 has a factory-set threshold voltage (V_IT) of 1.40 V, optimized for monitoring nominal 1.5 V power rails. This value is trimmed to ±0.5% accuracy over –40°C to 85°C, ensuring consistent brownout detection without external calibration. The device does not require a resistor divider for this rail, simplifying design and improving long-term stability.

How do I configure the reset delay time for the TPS3808G15DBVTG4?

The TPS3808G15DBVTG4 reset delay is configured via the CT pin: leave CT open for 20 ms, tie CT to VDD through a 40–200 kΩ resistor for 300 ms, or connect CT to GND via a capacitor (≥100 pF) for user-programmable delay from 1.25 ms to 10 s. For example, a 150 nF capacitor yields ~100 ms delay. Ceramic capacitors are recommended to minimize leakage-induced timing error.

Does the TPS3808G15DBVTG4 support manual reset functionality?

Yes, the TPS3808G15DBVTG4 includes a dedicated MR (manual reset) input (Pin 3). Driving MR low asserts RESET regardless of SENSE voltage. MR features an internal 90 kΩ pull-up to VDD, so it can be left unconnected if unused. When driven externally, MR accepts logic-low inputs down to 0.3×VDD and supports integration with watchdog timers or pushbutton circuits.

What package type is used by the TPS3808G15DBVTG4?

The TPS3808G15DBVTG4 uses the SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body size, 0.95 mm height, surface-mount, lead-free, and RoHS-compliant. It shares pinout and footprint with other TPS3808 variants in DBV packaging, enabling drop-in replacement within the family for different thresholds or delay configurations.

Can the TPS3808G15DBVTG4 monitor voltages below 1.5 V?

No-the TPS3808G15DBVTG4 is a fixed-threshold device with V_IT = 1.40 V, intended exclusively for 1.5 V rail supervision. To monitor lower voltages (e.g., 0.9 V or adjustable thresholds), select other members of the family such as TPS3808G09 (0.84 V) or TPS3808G01 (adjustable down to 0.405 V). Using TPS3808G15DBVTG4 outside its specified 1.40 V threshold violates its design intent and datasheet guarantees.