Texas Instruments TPS61130RSAR

Overview

TPS61130RSAR from Texas Instruments is a synchronous SEPIC and flyback DC-DC converter with integrated 200-mA reverse-voltage-protected LDO, designed for single-cell Li-Ion/Li-Polymer or multi-cell alkaline/NiMH battery-powered portable systems. It delivers up to 300 mA from the SEPIC stage (2.5–5.5 V adjustable output) and supports dual-output operation with independent enable control, used in MP3 players, PDAs, and USB-powered devices.

For engineers reviewing the TPS61130RSAR datasheet, TPS61130RSAR pinout, TPS61130RSAR application, or TPS61130RSAR equivalent, key selection criteria include its 1.8–6.5 V input range, 400–600 kHz fixed-frequency PWM operation, 1.3 A typical switch current limit, low-battery detection with programmable threshold, and thermal performance in the 4 mm × 4 mm VQFN-16 package.

Technical Context

The TPS61130RSAR implements a fixed-frequency, multiple-feedforward PWM controller with synchronous rectification using integrated N-channel and P-channel MOSFETs. Its SEPIC topology enables buck-boost regulation without DC path between input and output, supporting input voltages both above and below the regulated output.

It integrates a dedicated LDO stage with reverse-voltage protection, independently enabled via LDOEN, and features power-save mode (controlled by SKIPEN), overtemperature shutdown at 140°C, and antiringing circuitry to suppress SW-node oscillation during discontinuous conduction mode.

Key Specifications

Pinout & Package

TPS61130RSAR is housed in a thermally enhanced 4 mm × 4 mm VQFN-16 package (RSA) with exposed thermal pad soldered to PGND for optimal heat transfer.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output buck-boost converter applications.

Compared with TPS61130RSAR, TPS61088RHLR offers greater power delivery but increases system complexity for dual-rail use, while MAX17222ETA+ reduces footprint and quiescent current at the expense of LBO flexibility and EMI mitigation-making TPS61130RSAR optimal for balanced portable power with integrated supervision and noise control.

Availability

TPS61130RSAR is available at Aetrix Electronics and suitable for portable audio devices, handheld computing platforms, USB-powered peripherals, and battery-backed industrial sensors requiring stable component supply across extended production cycles.

Supply support for TPS61130RSAR 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 and embedded processing technologies, with decades of expertise in power management ICs for portable and industrial applications.

The TPS6113x product line was engineered to solve dual-rail power challenges in battery-operated portable electronics, integrating SEPIC/flyback conversion with protected LDO regulation in compact packages for minimal board space and design effort.

FAQ

What is the function of the SKIPEN pin on the TPS61130RSAR?

The SKIPEN pin on the TPS61130RSAR enables or disables power-save mode: when pulled high, the device enters pulse-skipping operation at light loads to maintain high efficiency; when tied low, it forces fixed-frequency PWM operation. This feature directly impacts quiescent current-40 μA typical in power-save mode versus higher current in forced-PWM-making SKIPEN critical for optimizing battery runtime in intermittent-use applications like remote controls or sensor nodes using the TPS61130RSAR.

Can the TPS61130RSAR generate two independent output voltages simultaneously?

Yes, the TPS61130RSAR can generate two independent regulated outputs: the primary SEPIC output (adjustable 2.5–5.5 V via FB pin) and a secondary LDO output (adjustable 0.9–5.5 V via LDOSENSE). Each stage has independent enable control-EN for the SEPIC converter and LDOEN for the LDO-allowing flexible sequencing, such as powering the MCU first and enabling the sensor rail only on demand. This dual-output capability is intrinsic to the TPS61130RSAR's architecture and does not require external components beyond resistive dividers.

How is low-battery detection implemented in the TPS61130RSAR?

Low-battery detection in the TPS61130RSAR uses the LBI pin with an internal 500 mV comparator threshold and 10 mV hysteresis. A resistor divider from VBAT to GND scales the battery voltage to 500 mV at the desired cutoff point (e.g., 3.0 V battery → 500 mV at LBI). When the scaled voltage drops below threshold, LBO asserts low (open-drain). The function is only active when EN = high; during shutdown, LBO goes high-impedance. This precise, user-programmable monitoring is a core feature of the TPS61130RSAR for graceful system shutdown.

What thermal considerations apply to the TPS61130RSAR in the VQFN-16 package?

The TPS61130RSAR in the RSA (VQFN-16) package has a junction-to-ambient thermal resistance (θJA) of 33.9 °C/W, significantly lower than the TSSOP variant (100.5 °C/W), due to its exposed thermal pad. To achieve this rating, the pad must be soldered to a minimum 100 mm² copper pour connected to PGND. Without proper thermal land design, junction temperature rise will exceed specifications under 300 mA load, potentially triggering overtemperature shutdown. This thermal behavior is documented in the TPS61130RSAR's datasheet and is essential for reliable operation in enclosed portable enclosures.

Does the TPS61130RSAR support operation with input voltage below 2.0 V?

Yes, the TPS61130RSAR supports input voltages as low as 1.8 V per its recommended operating conditions, enabling full utilization of single-cell Li-Ion batteries down to end-of-discharge (~2.8 V) and alkaline/NiMH cells nearing depletion (~1.8 V). Its undervoltage lockout activates only below ~1.6 V, ensuring stable regulation across the usable battery range. This 1.8 V minimum input is a defined specification of the TPS61130RSAR-not an estimate-and is validated across temperature and load conditions in the official electrical characteristics table.