Texas Instruments TPS65050RSMR

Overview

TPS65050RSMR from Texas Instruments is a 6-channel power-management IC integrating two 600-mA step-down DC-DC converters (for I/O and core rails) and four low-input-voltage LDOs (two 400-mA, two 200-mA) in a single 4 mm × 4 mm VQFN package. It operates from a single Li-Ion cell (2.5 V–6 V input), supports digital voltage selection via DEFLDOx pins, and features 2.25-MHz fixed-frequency switching with PFM/PWM mode control via MODE pin - used in OMAP™/TMS320™ DSP power systems and portable media players.

For engineers reviewing the TPS65050RSMR datasheet, TPS65050RSMR pinout, TPS65050RSMR application, or TPS65050RSMR equivalent, key selection considerations include dual-buck converter current capability (600 mA each), LDO output current ratings (400 mA / 200 mA), digital voltage configuration for all four LDOs, 32-pin VQFN thermal-pad packaging, and push-button ON/OFF sequencing support via PB_IN/PB_OUT.

Technical Context

The TPS65050RSMR implements two independent synchronous buck converters operating at 2.25 MHz with 180° out-of-phase switching to reduce input ripple. Each converter supports externally adjustable output (0.6 V to V_IN) with ±1% accuracy in PWM mode and enters power-save (PFM) mode below ~10 mA load.

All four LDOs accept 1.5 V–6.5 V input and provide high PSRR (70 dB @ 10 kHz); LDO1/LDO2 deliver up to 400 mA with 280–400 mV dropout at full load, while LDO3/LDO4 supply 200 mA with 280 mV dropout. Digital voltage selection is implemented via 4-bit DEFLDOx inputs (DEFLDO1–DEFLDO4), enabling programmable default outputs without external resistors.

Key Specifications

Pinout & Package

TPS65050RSMR uses a 32-pin VQFN package (RSM) with 0.5-mm pitch and an exposed thermal pad soldered to PCB ground for thermal management. Pin numbering follows top-view counterclockwise convention starting from top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail power management applications.

Compared with TPS65050RSMR, TPS65054RSMR offers fixed DCDC2 outputs but loses digital LDO programming, while TPS65056RSMR sacrifices DCDC1 adjustability for guaranteed 3.3-V compliance - both retain identical pinout, thermal performance, and sequencing features.

Availability

TPS65050RSMR is available at Aetrix Electronics and suitable for smartphone baseband power, OMAP™ application processor supply, and portable media player systems requiring stable component supply, long-term lifecycle support, and qualified automotive-grade alternatives.

Supply support for TPS65050RSMR 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 specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.

The TPS6505x product line was designed specifically for single-cell Li-Ion/Li-Polymer systems requiring tightly integrated, sequenced, and digitally configurable multi-rail power - targeting OMAP™, TMS320™, and S3C24xx-based portable computing platforms.

FAQ

What is the maximum output current supported by each DC-DC converter in the TPS65050RSMR?

The TPS65050RSMR supports up to 600 mA per DC-DC converter (DCDC1 and DCDC2). This rating applies across the full input voltage range (2.5 V–6 V) and ambient temperature (–40°C to 85°C), with thermal derating per R_θJA = 37.3°C/W. The device maintains regulation under these loads with <2% output voltage deviation in PWM mode.

Does the TPS65050RSMR support hardware-based power sequencing?

Yes, the TPS65050RSMR supports hardware-based sequencing through independent enable pins (EN_DCDC1, EN_DCDC2, EN_LDO1–EN_LDO4) and the PB_IN/PB_OUT push-button interface. Pulling PB_IN high triggers a 32-ms debounced signal on PB_OUT, which can be connected to enable inputs to enforce strict power-up/down order without software intervention.

How does the digital voltage selection work for the LDOs in the TPS65050RSMR?

The TPS65050RSMR uses four digital input pins - DEFLDO1 (LSB), DEFLDO2, DEFLDO3, and DEFLDO4 (MSB) - to select predefined output voltages for LDO1–LDO4 per TI's Table 1. For example, a logic state of 0000 sets LDO1 to 1.2 V, LDO2 to 1.8 V, LDO3 to 1.1 V, and LDO4 to 1.2 V. No external resistors are required for these default configurations.

What is the purpose of the MODE pin on the TPS65050RSMR?

The MODE pin on the TPS65050RSMR selects between automatic power-save mode (PFM at light loads, PWM at heavy loads) when pulled low, and forced PWM mode when pulled high. Forced PWM eliminates frequency variation and associated EMI spread, while PFM maximizes efficiency below ~10 mA load - both modes maintain ±1% output accuracy in regulation.

Can the TPS65050RSMR operate from a 1.8-V input source?

No, the TPS65050RSMR requires a minimum input voltage of 2.5 V on V_INDCDC1/2 for DC-DC converter operation, as specified in Recommended Operating Conditions. While LDO inputs accept as low as 1.5 V, the DC-DC converters - which supply most system rails - cannot function below 2.5 V. Systems with sub-2.5-V sources require pre-regulation or alternative PMICs.