Texas Instruments TPS61031RSAR

Overview

TPS61031RSAR from Texas Instruments is a synchronous boost DC-DC converter IC designed for single-cell Li-ion or dual/triple-cell alkaline/NiMH battery-powered systems. It delivers up to 1000 mA at 5 V output from 1.8–5.5 V input, features 96% peak efficiency, 20 µA quiescent current, and integrated low-battery comparator with LBI/LBO interface - used in portable audio players, PDAs, and handheld instrumentation.

For engineers reviewing the TPS61031RSAR datasheet, TPS61031RSAR pinout, TPS61031RSAR application, or TPS61031RSAR equivalent, key selection considerations include fixed 5 V output, QFN-16 (4 mm × 4 mm) package with PowerPAD™ thermal pad, 4 A switch current limit, Power Save mode operation, and synchronous rectification for high light-load efficiency.

Technical Context

The TPS61031RSAR implements a fixed-frequency (600 kHz nominal), multiple feed-forward PWM controller with synchronous N-channel/P-channel MOSFET rectification. Input voltage, output voltage, and NMOS switch voltage drop are directly monitored to dynamically adjust duty cycle, reducing reliance on slow error-amplifier loop compensation.

It integrates a programmable low-battery detector (500 mV threshold at LBI, 10 mV hysteresis), antiringing switch for EMI reduction in discontinuous conduction mode, and load disconnect during shutdown via active isolation of the PMOS backgate diode - eliminating external reverse-blocking components.

Key Specifications

Pinout & Package

TPS61031RSAR is housed in a thermally enhanced 4 mm × 4 mm QFN-16 package (RSA) with exposed PowerPAD™ thermal pad that must be soldered to PGND for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost converter applications.

Compared with TPS61031RSAR, TPS61030RSAR offers identical thermal and electrical behavior except output voltage, while TPS61291DRVR trades LBI/LBO functionality and lower quiescent current for higher switching frequency and reduced pin count - requiring careful trade-off analysis per system architecture.

Availability

TPS61031RSAR is available at Aetrix Electronics and suitable for portable audio players, handheld terminals, and wireless sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS61031RSAR 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies.

The TPS6103x family was engineered for high-efficiency, low-quiescent-power boost conversion in space-constrained, battery-operated portable electronics - emphasizing thermal robustness, integrated protection, and simplified bill-of-materials.

FAQ

What is the output voltage configuration of the TPS61031RSAR?

The TPS61031RSAR provides a fixed 5 V output voltage. Unlike adjustable variants (e.g., TPS61030/TPS61032), it does not require external feedback resistors. The FB pin is internally connected to the 5 V reference and must be left unconnected or tied to GND per TI's datasheet guidance to ensure stable operation and avoid unintended regulation errors.

Does the TPS61031RSAR support external clock synchronization?

Yes, the TPS61031RSAR supports external clock synchronization via the SYNC pin. When driven with a TTL/CMOS-compatible clock signal between 500 kHz and 700 kHz (±20% of nominal 600 kHz), the device locks to the external frequency. This capability enables EMI reduction through frequency dithering or alignment with system timing domains - critical in noise-sensitive applications like medical monitors.

How does the TPS61031RSAR achieve load disconnect during shutdown?

The TPS61031RSAR achieves true load disconnect by actively isolating the PMOS body diode path during shutdown. When EN is pulled low, internal circuitry disconnects the cathode of the PMOS backgate diode from its source, preventing reverse current flow from VOUT to VBAT. This eliminates the need for external blocking diodes and ensures zero battery drain - a key advantage over conventional boost converters.

What thermal design requirements apply to the TPS61031RSAR QFN package?

The TPS61031RSAR in RSA (QFN-16) package requires soldering the exposed PowerPAD™ thermal pad to a dedicated PGND copper area on the PCB. Thermal resistance is R_θJA = 35.5°C/W; failure to connect the pad degrades thermal performance significantly. TI recommends ≥250 mm² of 2-oz copper connected via ≥4 thermal vias (0.3 mm diameter) to inner ground planes to sustain 1 A continuous output at 85°C ambient.

Can the low-battery comparator in the TPS61031RSAR be disabled?

Yes, the low-battery comparator in the TPS61031RSAR can be effectively disabled by connecting the LBI pin directly to GND (or VBAT). When LBI is held at a fixed potential outside the 490–510 mV detection window, the comparator remains inactive and LBO stays in high-impedance state. Leaving LBI floating is prohibited - it must be terminated to avoid erratic LBO behavior and potential system instability.