Texas Instruments TPS3837K33DBVR

Overview

TPS3837K33DBVR from Texas Instruments is a nano-power voltage supervisor IC designed for precision undervoltage monitoring in battery-powered systems. It features a 2.93 V threshold (V_IT), active-high push-pull RESET output, 220 nA typical supply current, selectable 10 ms or 200 ms reset delay via CT pin, and operates across –40°C to 85°C. It is used to ensure reliable power-on and brownout reset for MSP430 microcontrollers supplied by 3.6 V lithium-ion batteries.

For engineers reviewing the TPS3837K33DBVR datasheet, TPS3837K33DBVR pinout, TPS3837K33DBVR application, or TPS3837K33DBVR equivalent, key selection criteria include its active-high push-pull output eliminating external pull-up needs, precise 2.93 V trip point for 3.3 V nominal rail supervision, ultra-low quiescent current enabling multi-year battery life, and CT-configurable delay for system-level timing control.

Technical Context

The TPS3837K33DBVR integrates a precision bandgap reference, comparator with hysteresis (40 mV at 2.93 V), and a refresh timer that initiates after V_DD exceeds V_IT + V_HYS. Its internal logic asserts RESET high when V_DD falls below 2.93 V or MR is pulled low, with propagation delay t_PLH ≤ 50 µs (V_DD→RESET) and t_PLH ≤ 0.3 µs (MR→RESET).

Reset deassertion is gated by both voltage recovery (V_DD > V_IT + V_HYS) and the CT-selected delay timer (10 ms or 200 ms). The device uses no external components for basic operation-CT connects to GND or V_DD, MR connects to V_DD if unused, and RESET drives directly into MCU reset inputs without pull-up resistors.

Key Specifications

Pinout & Package

TPS3837K33DBVR is packaged in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3836K33DBVR and TPS3838K33DBVR, the TPS3837K33DBVR uniquely delivers active-high push-pull drive-reducing component count and simplifying interface to MCUs with active-high reset inputs-while maintaining identical precision, power, and timing performance.

Availability

TPS3837K33DBVR is available at Aetrix Electronics and suitable for battery-powered MCU reset, lithium-ion pack supervision, low-power wireless nodes, MSP430-based energy monitors, and portable medical sensors requiring stable component supply and long-term lifecycle support.

Supply support for TPS3837K33DBVR 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 low-power design, precision analog, and industrial-grade reliability.

The TPS383x family was engineered specifically for ultra-low-power voltage supervision in portable and battery-critical applications, emphasizing nanoscale quiescent current, factory-trimmed thresholds, and hardware-configurable timing without firmware overhead.

FAQ

What is the exact reset threshold voltage of the TPS3837K33DBVR?

The TPS3837K33DBVR has a nominal threshold voltage (V_IT) of 2.93 V, with a guaranteed range of 2.84 V to 2.99 V over –40°C to 85°C. This value is factory-trimmed and applies specifically to the K33 variant, ensuring accurate supervision of 3.3 V rails without external calibration. The TPS3837K33DBVR achieves this via an internal precision voltage divider referenced to a stable bandgap.

Does the TPS3837K33DBVR require an external pull-up resistor on the RESET pin?

No, the TPS3837K33DBVR does not require an external pull-up resistor because it features an active-high push-pull RESET output. The internal driver actively pulls the pin high during reset assertion and low during normal operation. This eliminates BOM cost and PCB area associated with pull-up resistors-unlike the open-drain TPS3838K33DBVR, which mandates an external pull-up.

How is the reset delay time configured on the TPS3837K33DBVR?

The reset delay time on the TPS3837K33DBVR is configured solely by the CT pin: connect CT to GND for a typical 10 ms delay, or to VDD for a typical 200 ms delay. No external capacitor is needed. This hardware-selectable timing avoids firmware dependencies and ensures deterministic reset behavior across temperature and voltage variations-critical for robust power sequencing in the TPS3837K33DBVR.

What is the maximum supply voltage the TPS3837K33DBVR can tolerate?

The TPS3837K33DBVR has an absolute maximum VDD rating of 7 V, but its recommended operating range is 1.6 V to 6 V. Operating above 6 V risks exceeding safe dissipation limits and may accelerate parametric drift. For 3.6 V lithium-ion battery applications, the TPS3837K33DBVR safely supervises directly without regulation, leveraging its wide input range and 220 nA quiescent current.

Can the TPS3837K33DBVR be used with MCUs other than the MSP430?

Yes, the TPS3837K33DBVR is compatible with any microcontroller, DSP, or FPGA that accepts an active-high reset signal and operates within its 1.6–6 V supply range. Its 2.93 V threshold, 220 nA I_DD, and push-pull output make it suitable for ARM Cortex-M0+ devices, PIC microcontrollers, and RISC-V SoCs-provided their reset input tolerates 3.3 V logic levels and the TPS3837K33DBVR's timing parameters meet system requirements.