Texas Instruments TPS65021RHAR

Overview

TPS65021RHAR from Texas Instruments is a highly integrated power management IC (PMIC) for single-cell Li-Ion/Li-Polymer systems, delivering three synchronous step-down converters (1.2-A, 1-A, 900-mA), two 200-mA LDOs, and a 30-mA RTC LDO with backup switching. It supports dynamic voltage scaling for processor cores and provides I²C interface, battery backup, and system reset control in a 40-pin VQFN package.

For engineers reviewing the TPS65021RHAR datasheet, TPS65021RHAR pinout, TPS65021RHAR application, or TPS65021RHAR equivalent, this device serves as a complete power solution for handheld processors including OMAP™, XScale®, and Intel® PXA270 - requiring precise rail sequencing, low-quiescent-current operation, and programmable voltage selection via DEF pins or I²C.

Technical Context

The TPS65021RHAR integrates three independent buck converters with internal P/N-channel MOSFETs, fixed/adjustable output voltages set by digital DEF pins or I²C register writes, and automatic PFM/PWM mode transition for efficiency across load ranges. Each converter features soft-start, discharge circuitry, and dedicated enable/control logic.

Its dual 200-mA LDOs support input range 1.5–6.5 V and digitally selectable default outputs; the 30-mA VRTC LDO includes automatic switchover between VSYSIN and VBACKUP with undervoltage detection. System-level functions include HOT_RESET debouncing, RESPWRON delay timing via external capacitor, and open-drain status outputs (INT, PWRFAIL, LOWBAT).

Key Specifications

Pinout & Package

The TPS65021RHAR is housed in a 40-pin VQFN (RHA) package with 0.5-mm pitch and thermally enhanced PowerPAD™ bottom pad connected internally to AGND. The package measures 6.00 mm × 6.00 mm and supports high-density PCB layouts with optimized thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65023RHAR and TPS65020RHAR, the TPS65021RHAR uniquely balances triple-buck capability, RTC backup, and I²C configurability - making it optimal for full-featured handheld processors requiring core voltage scaling and fail-safe timekeeping.

Availability

TPS65021RHAR is available at Aetrix Electronics and suitable for smartphone baseband power, OMAP™ processor platforms, Intel® PXA270 systems, and digital still camera core supply requiring stable component supply and long-term lifecycle support.

Supply support for TPS65021RHAR 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 system solutions.

The TPS6502x product line was designed specifically for Li-ion/Li-polymer powered portable electronics - integrating multiple DC-DC converters, LDOs, and system supervision functions into compact, thermally efficient packages for handheld processors.

FAQ

What is the maximum output current supported by each DC-DC converter in the TPS65021RHAR?

The TPS65021RHAR supports 1.2 A on DCDC1 (system voltage), 1 A on DCDC2 (memory voltage), and 900 mA on DCDC3 (processor core). These ratings are validated across –40°C to +85°C with appropriate external components (2.2 µH inductors, 10–22 µF output capacitors) and proper PCB thermal design per the datasheet layout guidelines. The TPS65021RHAR maintains these currents under worst-case input voltage (2.5 V) and ambient temperature conditions.

How does the TPS65021RHAR handle battery backup for real-time clock functionality?

The TPS65021RHAR provides automatic switchover between VSYSIN and VBACKUP inputs to supply the 3-V VRTC output. When VSYSIN falls below 2.55 V (with 100 mV hysteresis), the internal switch connects VBACKUP to maintain RTC operation. The TPS65021RHAR monitors both inputs with dedicated comparators and supports backup battery voltages from 2.73 V to 3.75 V - ensuring uninterrupted timekeeping during main power loss or battery replacement.

Can the output voltages of the TPS65021RHAR's LDOs be adjusted dynamically during operation?

Yes - the TPS65021RHAR supports dynamic LDO voltage adjustment via its I²C interface. While DEFLDO1/DEFLDO2 pins set factory defaults (four combinations), the I²C registers allow real-time reconfiguration of VLDO1 and VLDO2 outputs across their 1–3.3 V range. This capability enables adaptive power management in the TPS65021RHAR, such as lowering LDO voltage during low-power modes to reduce system leakage without hardware changes.

What is the purpose of the TRESPWRON pin on the TPS65021RHAR, and how is it configured?

The TRESPWRON pin on the TPS65021RHAR sets the duration of the active-low RESPWRON reset pulse using an external timing capacitor. A 1-nF capacitor yields a nominal 100-ms delay; values from 100 pF to 10 nF scale the delay linearly. This eliminates discrete RC networks and allows precise, board-level tuning of system reset timing - critical for synchronizing processor boot sequences in the TPS65021RHAR-based designs.

Does the TPS65021RHAR support I²C communication at standard and fast modes?

Yes - the TPS65021RHAR's SDAT and SCLK pins are fully compatible with both standard-mode (100 kHz) and fast-mode (400 kHz) I²C specifications. It operates with 4.7-kΩ pull-ups to VRTC and tolerates VIH ≥ 1.3 V and VIL ≤ 0.4 V across the full temperature range. This dual-mode support enables reliable register access and dynamic voltage scaling in the TPS65021RHAR, even in electrically noisy portable environments.