Texas Instruments TPS3808G30QDBVRQ1

Overview

TPS3808G30QDBVRQ1 from Texas Instruments is an automotive-grade, low-quiescent-current supervisory circuit designed to monitor 3.0 V system rails and assert an open-drain RESET signal upon undervoltage or manual reset assertion. It features 2.79 V threshold accuracy (±0.5%), 1.25 ms–10 s user-programmable delay via CT pin, 2.4 μA typical supply current, and operates across –40°C to +125°C - deployed in DSP, FPGA, and automotive radar power sequencing.

For engineers reviewing the TPS3808G30QDBVRQ1 datasheet, TPS3808G30QDBVRQ1 pinout, TPS3808G30QDBVRQ1 application, or TPS3808G30QDBVRQ1 equivalent, key selection criteria include its AEC-Q100 qualification, SOT-23-6 package compatibility, fixed 2.79 V threshold for 3.0 V rail monitoring, and support for capacitor-programmed reset delays down to 1.25 ms.

Technical Context

The TPS3808G30QDBVRQ1 implements a precision bandgap reference and comparator architecture to achieve ±0.5% threshold accuracy at 2.79 V over temperature. Its internal 220 nA CT charging current enables precise delay timing with external capacitors, while hysteresis on the SENSE input prevents chatter during voltage transients.

It uses an open-drain RESET output requiring an external pullup (10 kΩ–1 MΩ), supports manual reset via MR with 90 kΩ internal pullup, and maintains immunity to short negative transients on SENSE - validated by threshold overdrive vs. transient duration curves per Figure 9 of SBVS085J.

Key Specifications

Pinout & Package

SOT-23-6 package (2.90 mm × 1.60 mm body), surface-mount, lead-free, RoHS-compliant. Thermal pad not present - standard DBV variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G30QDBVRQ1, TPS3808G33QDBVRQ1 offers tighter alignment to 3.3 V rails but misaligns with 3.0 V systems, while MAX6326UT30D3+T sacrifices MR and delay configurability for lower cost and simpler layout - making TPS3808G30QDBVRQ1 optimal for automotive 3.0 V rail supervision requiring design flexibility and AEC-Q100 compliance.

Availability

TPS3808G30QDBVRQ1 is available at Aetrix Electronics and suitable for automotive radar, DSP power sequencing, and FPGA configuration integrity applications requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for TPS3808G30QDBVRQ1 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, embedded processing, and connectivity solutions with deep automotive and industrial expertise.

The TPS3808Gxx-Q1 product line delivers low-quiescent-current, AEC-Q100-qualified supervisory circuits optimized for reliable power sequencing and voltage monitoring in safety-critical automotive electronics.

FAQ

What is the exact threshold voltage of the TPS3808G30QDBVRQ1 and how is it specified?

The TPS3808G30QDBVRQ1 has a nominal threshold voltage (V_IT) of 2.79 V, factory-trimmed for monitoring 3.0 V rails. Per SBVS085J, this value is guaranteed within ±0.5% over –40°C to +125°C for V_IT ≤3.3 V, with no additional calibration required. The TPS3808G30QDBVRQ1 achieves this accuracy using a precision internal bandgap reference and laser-trimmed comparator offset.

Can the TPS3808G30QDBVRQ1 be used to monitor a 3.3 V rail instead of 3.0 V?

No - the TPS3808G30QDBVRQ1 is specifically trimmed for 2.79 V threshold and intended for 3.0 V rail supervision. For 3.3 V rails, TI specifies the TPS3808G33QDBVRQ1 (3.07 V threshold). Using TPS3808G30QDBVRQ1 on a 3.3 V rail would cause premature RESET assertion below 3.3 V, potentially disrupting system operation before the rail reaches its valid operating range.

What is the minimum external capacitor value required on the CT pin for programmable delay with the TPS3808G30QDBVRQ1?

The TPS3808G30QDBVRQ1 requires a minimum 100 pF capacitor between CT and GND to reliably recognize the presence of a timing capacitor. Capacitors below this value may result in inconsistent or shortened delay times due to internal comparator sensitivity limits. Ceramic capacitors are recommended for low leakage and stable timing performance across temperature.

Does the TPS3808G30QDBVRQ1 support manual reset (MR) functionality, and what is its input behavior?

Yes, the TPS3808G30QDBVRQ1 supports manual reset via the MR pin (Pin 3), which is active-low and internally pulled up to VDD with a 90 kΩ resistor. Driving MR ≤0.3×VDD asserts RESET immediately, independent of SENSE voltage. When MR returns high and SENSE exceeds 2.79 V, RESET deasserts after the programmed delay - enabling hardware-triggered resets for system recovery or firmware updates.

Is the TPS3808G30QDBVRQ1 compatible with both 1.8 V and 6.5 V supply voltages, and how does VDD affect its operation?

Yes, the TPS3808G30QDBVRQ1 operates across 1.8 V to 6.5 V on VDD (Pin 6), with quiescent current rising only marginally from 2.4 μA at 3.3 V to 2.7 μA at 6.5 V. VDD powers all internal circuitry and sets the logic thresholds for MR (0.3×VDD low, 0.7×VDD high) and RESET pullup voltage ceiling - allowing interface with mixed-voltage systems without level shifters.