TPS4141-Q1 Configurable Precision Resistor Divider

Introduction

Texas Instruments’ TPS4141-Q1 is an automotive-qualified, high-voltage precision resistor-divider IC for measuring voltage domains up to ±1200 V. The device combines a 30 MΩ precision-matched divider with a programmable-gain buffer amplifier and an integrated high-voltage disconnect switch, reducing the number of separate components required around a high-voltage sensing path.

Its combination of high standoff voltage, low divider leakage, selectable sensing behavior, and AEC-Q100 grade 1 qualification makes it relevant to automotive and industrial systems that need controlled measurement of elevated DC or bidirectional voltage nodes.

What it does

The TPS4141-Q1 scales high voltages through its integrated precision-matched resistor divider and presents the result to a programmable-gain buffer amplifier. It supports dynamically switched unidirectional and bidirectional voltage sensing over a range of up to ±1200 V.

An integrated high-voltage disconnect switch allows the sensing path to be switched, while the listed blocking direction is unidirectional. The device has a 1200 V standoff rating and a total divider resistance of 30 MΩ, supporting low-current voltage measurement. Specified leakage current is below 1.5 µA at an ambient temperature of +105°C.

For measurement accuracy, TI specifies typical gain error of ±0.15% and maximum input offset error of ±240 mV. The device draws 5 mA in the ON state and 5.5 µA in the OFF state, making its switched operating mode an important characteristic for systems that must limit inactive sensing-path current.

The TPS4141-Q1 is qualified to AEC-Q100 grade 1 and specified for ambient operation from -40°C to +125°C.

Applications

Potential uses that follow directly from its high-voltage measurement function include:

• Automotive battery-management and high-voltage battery sensing systems
• Voltage monitoring in electric-vehicle high-voltage subsystems
• Industrial high-voltage DC measurement equipment
• Solar-energy voltage sensing and monitoring circuits
• Designs requiring switched sensing of unidirectional or bidirectional high-voltage nodes

Design considerations

The TPS4141-Q1 is supplied in an 11-pin SOIC package identified as DWQ-11. Board layout must account for its high-voltage sensing role: the specified creepage and clearance requirement is at least 8 mm from the high-voltage sensing pin to every other pin.

The 1200 V standoff rating, up-to-±1200 V sensing range, and 30 MΩ divider resistance should be considered together with the system’s expected voltage polarity and sensing mode. Designers should also account for the distinction between dynamically switched bidirectional sensing support and the device’s specified unidirectional blocking direction.

Power budgeting should include both the 5 mA ON-state supply current and the 5.5 µA OFF-state supply current, particularly where the disconnect function is used to limit inactive current.

Availability and further information

The source and distributor link from Mouser Electronics, along with the datasheet link on this page, provide further technical information for the TPS4141-Q1.