Texas Instruments TPS650731RSLT

Overview

TPS650731RSLT from Texas Instruments is a highly integrated power management IC (PMIC) for single-cell Li-Ion/Li-Polymer battery-powered portable systems. It integrates a 2-A power path manager, linear battery charger (1.5-A max), three 2.25-MHz step-down converters (0.6 A / 0.6 A / 1.5 A), two LDOs (1.8 V / 1.8 V), wLED boost driver, 10-bit ADC, and touch screen interface - all in a 48-pin VQFN (6 mm × 6 mm). It targets OMAP35xx-based handhelds requiring coordinated core/memory/peripheral rail sequencing.

For engineers reviewing the TPS650731RSLT datasheet, TPS650731RSLT pinout, TPS650731RSLT application, or TPS650731RSLT equivalent, key selection criteria include internal DC-DC sequencing timing (400 ms reset delay), fixed 1.2 V / 1.35 V DCDC1/DCDC2 outputs, 1.8 V DCDC3 output, dual 1.8 V LDOs with dynamic voltage scaling on LDO2, and I²C-programmable wLED current sinks supporting up to 2×10 white LEDs.

Technical Context

The TPS650731RSLT implements a dedicated power path architecture that prioritizes system load over battery charging when both AC and USB inputs are present, enabling seamless switchover without brownout. Its three synchronous buck converters operate at fixed 2.25 MHz with automatic PFM/PWM mode transition, supporting light-load efficiency down to 19 µA per converter and 100% duty cycle for ultra-low dropout operation.

It features an integrated 10-bit ADC with four analog inputs (AD_IN1–AD_IN4) dedicated to resistive touch screen sensing (X/Y plates), plus two additional inputs (ISET1/ISET2) for wLED current calibration. The device uses internal register-controlled sequencing - not external timing components - to coordinate startup of DCDC1, DCDC2, and DCDC3 with defined voltage ramp order and inter-rail delays.

Key Specifications

Pinout & Package

TPS650731RSLT is housed in a thermally enhanced 48-pin VQFN package (6.00 mm × 6.00 mm, 0.4 mm pitch) with exposed thermal pad connected to PGND. The package supports automated optical inspection and high-density PCB layouts typical of portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65073RSLT, the TPS650731RSLT provides guaranteed internal sequencing and fixed 1.8 V DCDC3 - critical for OMAP35xx compatibility - while TPS650732RSLT adds a 3.3 V LDO at the cost of LDO2 symmetry, making TPS650731RSLT optimal for balanced dual-1.8 V peripheral rail designs.

Availability

TPS650731RSLT is available at Aetrix Electronics and suitable for handheld navigation devices, OMAP35xx-based PDAs, industrial terminals, embedded displays, and battery-powered portable instrumentation requiring stable component supply, long-lifecycle support, and consistent electrical performance across production batches.

Supply support for TPS650731RSLT 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 for industrial, automotive, and consumer markets.

The TPS6507x product line was designed specifically for single-cell Li-ion portable systems requiring tightly coordinated multi-rail power delivery, battery charging, and human interface integration - targeting OMAP, AM, and low-power DSP platforms.

FAQ

What is the primary function of the TPS650731RSLT in a portable system?

The TPS650731RSLT serves as a complete power management IC for single-cell Li-ion/Li-polymer battery systems. It integrates 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 resistive touch screen interface - all in one 48-pin VQFN package. Its role is to replace multiple discrete power components while ensuring safe, sequenced, and efficient power delivery to processors like OMAP35xx.

Does the TPS650731RSLT support internal power-up sequencing without external components?

Yes, the TPS650731RSLT includes built-in internal sequencing logic that autonomously controls the startup order and timing of DCDC1, DCDC2, and DCDC3. It implements a fixed 400 ms reset delay and coordinated voltage ramping - eliminating the need for external supervisors, timers, or RC networks. This capability is confirmed in the Device Options table and functional description sections of the SLVS950I datasheet.

What are the exact output voltages configured for DCDC1, DCDC2, and DCDC3 in the TPS650731RSLT?

The TPS650731RSLT is factory-configured with fixed output voltages: DCDC1 delivers 1.2 V for OMAP35xx core supply, DCDC2 delivers 1.35 V for memory rail, and DCDC3 delivers 1.8 V for peripheral and interface domains. These values are explicitly listed in the Device Options table (page 6) and are not adjustable via external resistors - they are set by internal register defaults and pin strapping (DEFDCDC2/DEFDCDC3).

Can the TPS650731RSLT drive white LED backlights, and how many strings does it support?

Yes, the TPS650731RSLT integrates a dedicated wLED boost converter with two programmable current sinks (ISINK1 and ISINK2) supporting up to two independent LED strings. Each string can be driven with up to 25 mA, enabling configurations such as 2×10 white LEDs. Current levels are set via external resistors (ISET1/ISET2) and controlled digitally through the WLED_CTRL0 register over I²C.

Is the touch screen interface on the TPS650731RSLT compatible with standard 4-wire resistive panels?

Yes, the TPS650731RSLT includes a fully integrated 4-wire resistive touch screen controller. It provides four dedicated analog inputs (AD_IN1–AD_IN4) mapped to X1/X2/Y1/Y2 plates, a 10-bit ADC, and internal reference generation - enabling direct connection to standard 4-wire resistive touch panels without external controllers or op-amps. This functionality is shared with TPS65070, TPS65073, and TPS650732 variants.