Texas Instruments TPS3808G09DBVTG4

Overview

TPS3808G09DBVTG4 from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 0.9 V system rails and assert an open-drain RESET signal when the SENSE voltage drops below 0.84 V threshold. It delivers 0.5% threshold accuracy, 2.4 μA typical supply current, and user-adjustable reset delay from 1.25 ms to 10 s via external capacitor on CT pin. It is used in battery-powered microcontroller systems requiring precise power-on reset timing.

For engineers reviewing the TPS3808G09DBVTG4 datasheet, TPS3808G09DBVTG4 pinout, TPS3808G09DBVTG4 application, or TPS3808G09DBVTG4 equivalent, key selection criteria include its fixed 0.84 V threshold for 0.9 V rails, SOT-23-6 package compatibility, −40°C to 125°C operating range, open-drain RESET output with 0.4 V max VOL at 1 mA, and MR input with 90 kΩ internal pull-up.

Technical Context

The TPS3808G09DBVTG4 implements a precision voltage comparator with built-in hysteresis (1% of VIT) and an on-chip 220 nA current source that charges an external CT capacitor to set reset delay. Its SENSE input monitors rail voltage directly, while MR provides asynchronous manual reset initiation independent of supply monitoring.

It operates across 1.7 V to 6.5 V VDD, supports RESET assertion during brownout (VDD ≥ VPOR = 0.8 V), and maintains functional reset behavior down to −40°C. The open-drain RESET output requires an external pull-up resistor (10 kΩ–1 MΩ) and tolerates voltages up to 6.5 V, enabling interface with higher-voltage logic domains.

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 TPS3808G09DBVTG4, TPS3808G09DBVR offers identical supervision performance in volume-friendly packaging, while MAX6326LT09D2T trades flexibility (no MR, fixed delay) for marginally lower cost in minimal-feature applications.

Availability

TPS3808G09DBVTG4 is available at Aetrix Electronics and suitable for microcontroller boot sequencing, battery-powered sensor nodes, FPGA configuration validation, and industrial I/O module supervision requiring stable component supply and long-term lifecycle support.

Supply support for TPS3808G09DBVTG4 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 company delivering analog and embedded processing solutions, with leadership in power management, signal chain, and real-time control technologies.

The TPS3808 family is engineered for precision voltage supervision in resource-constrained embedded systems, emphasizing ultra-low power consumption, factory-trimmed threshold accuracy, and flexible reset timing control across extended temperature ranges.

FAQ

What is the exact threshold voltage of the TPS3808G09DBVTG4 and how is it calibrated?

The TPS3808G09DBVTG4 has a nominal threshold voltage (VIT) of 0.84 V, factory-set to monitor 0.9 V rails. It achieves ±0.5% accuracy over −40°C to 125°C for VIT ≤ 3.3 V, verified via precision internal reference and laser trimming. This value is specified in TI's SBVS050M datasheet Table 5 and applies exclusively to the G09 variant - not adjustable or user-configurable.

Can the TPS3808G09DBVTG4 supervise voltages below 0.9 V, such as 0.8 V or 0.6 V?

No - the TPS3808G09DBVTG4 is a fixed-threshold device rated only for 0.9 V rail supervision (VIT = 0.84 V). To monitor lower voltages like 0.6 V or 0.8 V, use the adjustable TPS3808G01 variant with external resistor divider, or select a different fixed-threshold part such as TPS3808G01 (0.405 V) or TPS3808G12 (1.12 V). Using TPS3808G09DBVTG4 outside its specified 0.84 V threshold will result in incorrect reset behavior.

What is the minimum and maximum CT capacitor value supported by the TPS3808G09DBVTG4?

The TPS3808G09DBVTG4 requires CT ≥ 100 pF to reliably detect capacitor presence and enable programmable delay mode. Maximum practical value is ~180 nF, yielding ~10 s delay (per Figure 7-3). Capacitor leakage must be low (e.g., X7R/X5R ceramic); electrolytic or high-leakage types cause timing inaccuracy. Stray capacitance near CT pin must also be minimized per Layout Guidelines Section 11.1.

Does the TPS3808G09DBVTG4 support operation at VDD = 1.6 V?

No - the absolute minimum recommended VDD is 1.7 V per Section 7.3 of the datasheet. At 1.6 V, the device may fail to assert RESET correctly or exhibit undefined behavior, especially during power-up. The power-on reset voltage (VPOR) is 0.8 V, but functional operation requires VDD ≥ 1.7 V. For sub-1.7 V applications, consider TI's TPS3801 series or alternative ultra-low-VDD supervisors.

How does the MR pin function when left unconnected on the TPS3808G09DBVTG4?

When left unconnected, the MR pin is pulled high to VDD via an internal 90 kΩ resistor, rendering it inactive - RESET assertion depends solely on SENSE voltage crossing the 0.84 V threshold. No external pull-up is needed. This configuration is safe and commonly used; however, ensure PCB layout avoids contamination or leakage paths that could inadvertently pull MR low.