Texas Instruments TPS61092RSAR

Overview

TPS61092RSAR from Texas Instruments is a synchronous boost converter IC designed for single-cell Li-ion or dual-cell alkaline/NiMH battery-powered systems. It delivers up to 500 mA at 5 V output from as low as 1.8 V input, features 96% peak efficiency, integrated low-battery detection (LBI/LBO), and operates in PWM or power-save mode. It serves as the primary voltage rail generator in portable audio devices requiring stable 5-V supply under varying battery discharge.

For engineers reviewing the TPS61092RSAR datasheet, TPS61092RSAR pinout, TPS61092RSAR application, or TPS61092RSAR equivalent, this page provides verified functional specifications, validated pin-level circuit roles, confirmed 16-pin VQFN package mapping, real-world application constraints (e.g., 6.8 µH inductor, 100 µF output capacitance), and two technically documented alternative parts with explicit functional trade-offs.

Technical Context

The TPS61092RSAR implements a fixed-frequency (600 kHz nominal), multiple feed-forward PWM controller with synchronous rectification using internal N- and P-channel MOSFETs. Input voltage, output voltage, and NMOS switch voltage drop are monitored in real time to directly adjust duty cycle-bypassing slow error-amplifier loop latency for fast transient response.

It integrates a programmable low-battery comparator (500 mV threshold on LBI, 10 mV hysteresis) active only during EN = high, an antiringing switch to suppress SW-node oscillation in discontinuous conduction mode, and thermal shutdown at 140°C. Peak switch current is factory-limited to 2200 mA (typ), with soft-start limiting initial inrush to 40% of full current limit.

Key Specifications

Pinout & Package

TPS61092RSAR is housed in a thermally enhanced 16-pin VQFN package (4.0 mm × 4.0 mm, RSA suffix), with exposed PowerPAD™ soldered to PGND for optimal thermal dissipation. Pin count and layout match TPS61090/TPS61091, enabling shared PCB footprint across family variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61092RSAR, TPS61091RSAR offers identical form-factor and protection features but targets 3.3 V systems, while TPS61291DRVR trades battery monitoring and pin compatibility for higher output current and smaller package-requiring PCB redesign and external supervision circuitry.

Availability

TPS61092RSAR is available at Aetrix Electronics and suitable for portable audio devices, USB-powered peripherals, industrial handheld terminals, and wireless transmitters requiring stable component supply with guaranteed long-term sourcing.

Supply support for TPS61092RSAR 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 specializing in analog, embedded processing, and power management technologies, with over 50 years of innovation in energy-efficient power conversion.

The TPS6109x product line was engineered specifically for space-constrained, battery-operated portable electronics demanding high efficiency across wide input voltage ranges and integrated battery monitoring-enabling compact, reliable, and long-lasting power solutions.

FAQ

What is the fixed output voltage of the TPS61092RSAR?

The TPS61092RSAR provides a factory-trimmed fixed 5.0 V output voltage. This eliminates the need for external feedback resistors (R3/R4), simplifies layout, and guarantees ±3% regulation across temperature and load. The internal reference is 500 mV at the FB pin, but since FB is not accessible in the fixed-output variant, the output is set permanently to 5.0 V - matching USB specification requirements for portable peripherals.

Does the TPS61092RSAR support external frequency synchronization?

Yes, the TPS61092RSAR supports external synchronization via the SYNC pin. When driven with a logic-level clock signal (duty cycle 30–70%, frequency within ±20% of 600 kHz), the device locks its switching frequency to the external source. This feature enables EMI reduction by shifting noise away from sensitive bands and allows timing coordination with other system clocks - a capability confirmed in Section 9.3.6 and Table 2 of the SLVS484C datasheet.

How does the low-battery detection work on the TPS61092RSAR?

The TPS61092RSAR implements a dedicated low-battery comparator with a precise 500 mV threshold on the LBI pin and 10 mV hysteresis. When enabled (EN = high), it monitors a resistor-divided battery voltage; if the scaled voltage drops below 500 mV, the open-drain LBO pin pulls low. This signal can trigger MCU-initiated shutdown - verified in Sections 9.3.7 and 10.2.1.2.2 of the datasheet. LBO remains high-impedance when EN = low.

What is the maximum continuous output current capability of the TPS61092RSAR?

The TPS61092RSAR delivers up to 500 mA continuously at 5 V output when supplied from ≥2.4 V input, as confirmed in the device description, typical application schematic, and Figure 4 (efficiency vs. output current). At lower inputs (e.g., 1.8 V), maximum output current decreases per Figure 1 and Figure 2. The 2200 mA peak switch current limit ensures safe operation with standard 6.8 µH inductors under transient loads.

Is thermal management supported in the TPS61092RSAR package?

Yes, the TPS61092RSAR's 16-pin VQFN (RSA) package includes an exposed PowerPAD™ that must be soldered to a thermal pad connected to PGND. This structure lowers junction-to-board thermal resistance, enabling sustained 500 mA operation at ambient temperatures up to 85°C. Thermal shutdown activates at 140°C (Section 7.4), and layout guidelines in Section 12.2 specify minimum copper area and via count for reliable heat dissipation.