Texas Instruments TPS650731RSLR

Overview

TPS650731RSLR from Texas Instruments is a highly integrated power management IC (PMIC) for single-cell Li-Ion/Li-Polymer battery-powered portable systems, featuring a 2-A power path manager, linear battery charger (1.5-A max), three 2.25-MHz step-down converters (0.6/0.6/1.5 A), two LDOs (1.8 V / 1.8 V), wLED boost driver, 10-bit ADC, and touch screen interface - deployed in OMAP35xx- and AM3505-based navigation devices and PDAs.

For engineers reviewing the TPS650731RSLR datasheet, TPS650731RSLR pinout, TPS650731RSLR application, or TPS650731RSLR equivalent, key selection criteria include internal power-on sequencing support, fixed 1.2 V / 1.35 V DCDC1/DCDC2 outputs, 1.8 V DCDC3 output, dual 1.8 V LDOs, integrated touch controller with four analog inputs, and thermal regulation with NTC temperature sensing capability.

Technical Context

The TPS650731RSLR implements a hierarchical power architecture: its power path manager routes input from AC (4.3–5.8 V) or USB (5 V, up to 1.3 A) to SYS rail while charging the battery; three synchronous buck converters operate at fixed 2.25 MHz with PFM/PWM auto-transition and 100% duty cycle dropout support; LDO1 and LDO2 are fixed-output, low-quiescent (20 µA), 200-mA-capable regulators supplied from SYS or battery.

It integrates a 22-µH inductor-compatible wLED boost converter with two programmable current sinks (up to 25 mA per string), I²C-configurable registers for voltage selection and sequencing control, a 10-bit ADC with four dedicated touch-screen analog inputs (AD_IN1–AD_IN4), and an internal temperature-sense comparator interfacing to external NTC thermistors via TS pin.

Key Specifications

Pinout & Package

TPS650731RSLR is housed in a 48-pin VQFN package (6.0 mm × 6.0 mm, 0.4-mm pitch) with exposed thermal pad. The package supports high-power dissipation (R_θJC(bot) = 1 °C/W) and requires PCB-level thermal vias to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power management IC applications.

Compared with TPS65073RSLR, the TPS650731RSLR adds essential touch-screen analog inputs and controller support, while differing from TPS650732RSLR in LDO voltage pairing - making TPS650731RSLR uniquely suited for OMAP35xx/AM3505 systems with integrated resistive touch displays.

Availability

TPS650731RSLR is available at Aetrix Electronics and suitable for portable navigation systems, OMAP35xx-based handhelds, AM3505 PDAs, low-power DSP evaluation platforms, and industrial touch-enabled terminals requiring stable component supply across extended production lifecycles.

Supply support for TPS650731RSLR 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 decades of expertise in battery-powered portable system solutions.

The TPS6507x product line was designed specifically for single-cell Li-ion/Li-polymer applications in handheld computing and navigation devices, integrating charger, multiple DC-DCs, LDOs, LED drivers, and touch interfaces into a single compact PMIC.

FAQ

What is the primary function of the TPS650731RSLR in a portable system?

The TPS650731RSLR serves as a complete power management IC for single-cell Li-ion/Li-polymer systems, integrating a 2-A power path manager, 1.5-A linear battery charger, three step-down converters (1.2 V / 1.35 V / 1.8 V), two 1.8-V LDOs, wLED boost driver, 10-bit ADC, and full resistive touch screen interface - enabling compact, thermally efficient, and feature-rich portable designs without external support components.

Does the TPS650731RSLR support I²C configuration of output voltages?

Yes, the TPS650731RSLR supports I²C-based configuration of key parameters including DCDC1/DCDC2/DCDC3 output voltages (via DEFDCDC2/DEFDCDC3 pins and registers), wLED current levels, ADC channel selection, and touch screen control settings - though its factory-default outputs are fixed at 1.2 V / 1.35 V / 1.8 V for DCDC1/DCDC2/DCDC3 and 1.8 V / 1.8 V for LDO1/LDO2.

How does the TPS650731RSLR handle battery temperature monitoring?

The TPS650731RSLR monitors battery temperature via its TS pin, which accepts an external NTC thermistor (default 10-kΩ curve 2). Internal circuitry converts the thermistor resistance into a digital value readable via the integrated 10-bit ADC, and the device can be programmed to trigger thermal regulation or charge suspension based on measured temperature thresholds.

What is the role of the INT_LDO pin on the TPS650731RSLR?

The INT_LDO pin on the TPS650731RSLR provides a dedicated 2.26-V internal LDO output that powers the integrated touch screen controller (TSC), ensuring stable, low-noise reference for accurate analog-to-digital conversion of touch panel signals - it requires a 2.2-µF bypass capacitor to GND and is not user-adjustable.

Can the TPS650731RSLR operate without an external microcontroller for power sequencing?

Yes, the TPS650731RSLR includes hardwired internal power-on sequencing logic that automatically enables DCDC1, DCDC2, DCDC3, and LDOs in a predefined order upon PB_IN assertion - eliminating dependency on external firmware or sequencer ICs and simplifying system startup in resource-constrained portable devices.