Texas Instruments TPS61132RSAR

Overview

TPS61132RSAR from Texas Instruments is a synchronous SEPIC and flyback DC-DC converter with integrated 200-mA reverse-voltage-protected LDO, designed for dual-output power management in portable battery-powered systems. It delivers up to 300 mA at 3.3 V from the SEPIC stage and 200 mA at 1.5 V from the LDO stage, operating across 1.8 V–6.5 V input (e.g., single-cell Li-ion or multi-cell alkaline/NiMH), with 40-μA typical quiescent current and 500-kHz fixed-frequency PWM control.

For engineers reviewing the TPS61132RSAR datasheet, TPS61132RSAR pinout, TPS61132RSAR application, or TPS61132RSAR equivalent, key selection criteria include its dual regulated outputs (3.3 V SEPIC + 1.5 V LDO), low-battery detection (500 mV threshold), power-good signaling, thermal shutdown (140 °C), and VQFN-16 (4 mm × 4 mm) package with separate PGND/GND pins for EMI-sensitive designs.

Technical Context

The TPS61132RSAR implements a fixed-frequency (400–600 kHz) synchronous SEPIC topology using internal N-channel and P-channel MOSFETs (SWP/SWN), enabling buck-boost operation without polarity inversion and supporting input voltages both below and above output. Its controller uses multiple feedforward paths-monitoring VBAT, VOUT, and NMOS switch voltage drop-to directly adjust duty cycle, reducing reliance on slow error-amplifier loop compensation.

It integrates a dedicated 200-mA LDO with reverse-voltage protection, independently enabled via LDOEN, and configurable for post-regulation of the SEPIC output or direct regulation from VBAT/LDOIN. The LDO features ±3% total accuracy, 300 mV dropout at 200 mA, and 70 dB PSRR at 100 Hz, while the SEPIC stage includes antiringing circuitry, soft-start, undervoltage lockout (~1.6 V), and overtemperature protection (140 °C with 20 °C hysteresis).

Key Specifications

Pinout & Package

The TPS61132RSAR is housed in a thermally enhanced 4-mm × 4-mm VQFN-16 package (RSA) with exposed thermal pad soldered to PGND for optimal heat dissipation (R_θJB = 11 °C/W). Pin numbering follows top-view orientation with pin 1 at top-left corner; thermal pad must be connected to PGND plane for safe operation at full load.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61132RSAR, TPS61088RHLR offers higher boost current but requires external components to replicate dual-rail capability, while MAX17222ETA+ achieves nanowatt shutdown at the cost of losing integrated supervision and secondary regulation-making TPS61132RSAR uniquely suited for compact, battery-aware dual-rail systems.

Availability

TPS61132RSAR is available at Aetrix Electronics and suitable for portable medical devices, handheld scanners, audio players, and smart remotes requiring stable dual-output power supply with battery supervision and low-quiescent operation.

Supply support for TPS61132RSAR 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 ICs, with decades of expertise in battery-powered system solutions.

The TPS6113x family was engineered specifically for space-constrained, multi-rail portable electronics-delivering integrated SEPIC conversion and post-regulation LDO functionality in a single VQFN package to simplify power architecture.

FAQ

What is the output voltage configuration of the TPS61132RSAR?

The TPS61132RSAR provides two fixed, factory-programmed output voltages: the SEPIC stage delivers 3.3 V at up to 300 mA, and the integrated LDO delivers 1.5 V at up to 200 mA. Unlike adjustable variants (e.g., TPS61130), no external feedback resistors are required-the FB and LDOSENSE pins are internally connected and should remain unconnected in standard operation.

Does the TPS61132RSAR support battery voltage monitoring?

Yes, the TPS61132RSAR includes a dedicated low-battery detector with LBI and LBO pins. The LBI pin accepts a scaled-down battery voltage via an external resistor divider; when that voltage falls below 500 mV (with 10 mV hysteresis), the open-drain LBO pin pulls low. This feature is active only when EN is high and enables early warning of battery depletion without external circuitry.

How does the TPS61132RSAR handle thermal management?

The TPS61132RSAR incorporates overtemperature protection that triggers at 140 °C junction temperature, disabling both SEPIC and LDO stages until temperature falls by 20 °C hysteresis. Its VQFN-16 RSA package features an exposed thermal pad that must be soldered to a PGND copper plane to achieve the specified R_θJB of 11 °C/W-critical for sustaining full 300 mA/200 mA loads in compact layouts.

Can the LDO stage of the TPS61132RSAR be powered independently from the SEPIC output?

Yes, the LDO stage accepts input from multiple sources: it can be supplied from the SEPIC VOUT (3.3 V), directly from VBAT (1.8–6.5 V), or from an external rail such as USB 5 V or an AC adapter. The LDOEN pin enables independent control, and reverse-voltage protection blocks current flow from LDOOUT back to LDOIN-enabling seamless power source handover without external diodes.

What is the purpose of the separate PGND and GND pins on the TPS61132RSAR?

The TPS61132RSAR separates power ground (PGND, Pin 1) from control ground (GND, Pin 10) to isolate high-di/dt switching currents from sensitive analog and logic references. PGND carries return current for SWP/SWN switches, while GND serves EN, LDOEN, SKIPEN, LBI, and FB. Proper PCB layout requires connecting both grounds at a single point near the thermal pad to prevent noise coupling into regulation and enable paths.