Texas Instruments TPS3899DL29DSER

Overview

TPS3899DL29DSER from Texas Instruments is a nano-power, precision voltage supervisor with push-button monitoring capability, ±0.5% threshold accuracy, 125nA typical quiescent current, and programmable sense/reset delay via external capacitors on CTS/CTR pins - used in battery-powered industrial and computing systems to ensure reliable power-on reset and fault recovery.

For engineers reviewing the TPS3899DL29DSER datasheet, TPS3899DL29DSER pinout, TPS3899DL29DSER application, or TPS3899DL29DSER equivalent, key selection considerations include its open-drain active-low RESET output, 0.505V adjustable threshold, 1.5mm × 1.5mm WSON-6 package, –40°C to +125°C operation, and dual-delay programmability for glitch-immune rail or push-button monitoring.

Technical Context

The TPS3899DL29DSER implements a precision comparator with built-in 5% hysteresis and independent capacitor-programmable timing: CTS sets sense delay (assertion) from 30µs to ~6.5s; CTR sets reset delay (deassertion) over the same range. Its SENSE pin operates independently of VDD (0–6V input range), enabling rail redundancy and external resistor-divider configuration.

It supports functional safety system design with documented failure modes and diagnostic coverage data, and features glitch immunity (10µs minimum at 5% VIT– overdrive), UVLO protection (VPOR = 700mV), and high-impedance SENSE input (≤0.1µA leakage) for low-disturbance monitoring of critical rails or manual reset inputs.

Key Specifications

Pinout & Package

TPS3899DL29DSER uses a 6-pin WSON package (1.5mm × 1.5mm, 0.5mm pitch) with wettable flanks for automated optical inspection. The exposed thermal pad is electrically connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3899DL29DSER, the PL variant eliminates pull-up dependency for cleaner signal integrity, while the TPS3897DL29DSER trades programmability for ultra-low IQ - making the DL29 the optimal balance of configurability, precision, and power in demanding industrial designs.

Availability

TPS3899DL29DSER is available at Aetrix Electronics and suitable for electricity meters, building automation controllers, and Body Control Modules requiring stable component supply across extended temperature and long product lifecycles.

Supply support for TPS3899DL29DSER 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 for industrial, automotive, and consumer markets.

The TPS3899 family was designed specifically for high-reliability, ultra-low-power supervision in space-constrained, battery-operated, and safety-critical systems - emphasizing precision thresholding, dual independent delays, and rail redundancy.

FAQ

What is the function of the CTS pin on the TPS3899DL29DSER?

The CTS pin on the TPS3899DL29DSER serves as the capacitor-programmable sense delay input. When a capacitor is connected between CTS and GND, it sets the time delay before RESET asserts after the SENSE voltage falls below the threshold (VIT–). With no capacitor, the default sense delay is 30–50µs; with a 1µF capacitor, it extends to ~619ms. This feature enables robust push-button debouncing and immunity to short voltage glitches on monitored rails.

Does the TPS3899DL29DSER require an external pull-up resistor on the RESET pin?

Yes, the TPS3899DL29DSER requires an external pull-up resistor on the RESET pin because it features an open-drain active-low output. The resistor must connect RESET to a valid logic-high voltage (up to 6.0V), which may differ from VDD. Typical values range from 10kΩ to 100kΩ depending on rise-time and bus loading requirements. Without this pull-up, RESET cannot achieve a defined high state.

What is the exact threshold voltage programmed into the TPS3899DL29DSER?

TPS3899DL29DSER is factory-configured with an adjustable 0.505V negative-going input threshold (VIT–), as indicated by the "29" suffix in the part number per TI's naming convention ('29' = 0.505V ADJ). This allows direct monitoring of sub-1V rails (e.g., 0.6V CPU cores) without external resistor dividers, while maintaining ±0.5% accuracy across –40°C to +125°C.

Can the TPS3899DL29DSER monitor a voltage rail higher than its VDD supply?

Yes, the TPS3899DL29DSER can monitor a voltage rail higher than its VDD supply because the SENSE pin operates independently and accepts input voltages from 0V to 6.0V regardless of VDD level. For example, with VDD = 3.3V, SENSE can safely monitor a 5V or 12V rail using an external resistor divider - enabling rail redundancy and flexible system-level supervision architectures.

How does the TPS3899DL29DSER handle power-up sequencing?

The TPS3899DL29DSER manages power-up sequencing via a controlled startup sequence: upon VDD ramp, RESET remains asserted until VDD exceeds VPOR (700mV), then waits through tSTRT (≤300µs) before enabling threshold monitoring. Only after tSTRT + CTR delay (if capacitor used) does RESET deassert - ensuring clocks and regulators stabilize before releasing the host processor from reset.