Texas Instruments TPS65020RHAT

Overview

TPS65020RHAT 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, 800-mA), two 200-mA LDOs, and a 20-mA RTC LDO with backup switching. It supports dynamic voltage scaling via I²C, features push-button wake-up/reset, and provides battery-fail monitoring - used in Intel PXA270- and OMAP-based handhelds including smartphones and PDAs.

For engineers reviewing the TPS65020RHAT datasheet, TPS65020RHAT pinout, TPS65020RHAT application, or TPS65020RHAT equivalent, key selection criteria include its triple-buck architecture with independent enable/control, I²C programmability for core voltage scaling, low-quiescent-current PFM mode (85 µA), thermal shutdown (160°C), and VQFN-40 package compatibility with space-constrained portable designs.

Technical Context

The TPS65020RHAT integrates three independent buck converters sharing a common 1.3–1.7 MHz oscillator but operating with separate enable pins (DCDC1_EN/DCDC2_EN/DCDC3_EN), feedback inputs (VDCDC1/VDCDC2/VDCDC3), and switch nodes (L1/L2/L3). Each converter supports fixed or resistor-divider-adjustable output voltages - DCDC1: 3.0/3.3 V; DCDC2: 1.8/2.5 V; DCDC3: 1.3/1.55 V - with ±1% accuracy under load and 750 µs soft-start ramp.

Its dual 200-mA LDOs (VLDO1/VLDO2) accept 1.5–6.5 V input and deliver regulated outputs with ≤150 mV dropout at 200 mA; the VRTC LDO supplies 3 V @ 20 mA with automatic switchover between VSYSIN and VBACKUP. Control logic includes open-drain interrupt (INT), power-good signaling, and I²C interface compliant with fast-mode (400 kHz) timing.

Key Specifications

Pinout & Package

VQFN-40 (6.0 mm × 6.0 mm, PowerPAD™ exposed thermal pad) - thermally optimized for handheld PCBs with tight layout constraints and high power density requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65020RHAT, TPS65023RHAT adds a third LDO without changing pinout or thermal profile, while TPS65021RHAT removes RTC support to lower unit cost - both maintain identical buck converter specs and I²C programming interface.

Availability

TPS65020RHAT is available at Aetrix Electronics and suitable for smartphone, PDA, and digital still camera designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for production programs.

Supply support for TPS65020RHAT 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 over 50 years of innovation in energy-efficient IC design.

The TPS6502x family was engineered specifically for Li-ion-powered portable electronics, targeting Intel PXA and TI OMAP platforms with tightly integrated, sequenced, and scalable multi-rail power delivery.

FAQ

What is the maximum output current capability of each DC-DC converter in the TPS65020RHAT?

The TPS65020RHAT provides three independent buck converters: DCDC1 delivers up to 1.2 A for system I/O rails, DCDC2 supplies up to 1.0 A for memory domains, and DCDC3 supports up to 800 mA for processor core voltage. These ratings are validated across –40°C to 85°C ambient and require proper thermal layout per the datasheet's RθJB = 6.6°C/W specification. The TPS65020RHAT maintains regulation within ±1% accuracy at full load.

Does the TPS65020RHAT support dynamic voltage scaling (DVS) for the processor core rail?

Yes, the TPS65020RHAT supports dynamic voltage scaling for the DCDC3 output via its I²C-compatible serial interface. Engineers can write to the DEFCORE register to adjust the core voltage between 1.3 V and 1.55 V in real time, enabling power optimization during varying computational loads. This feature is explicitly documented in the TPS65020RHAT register map and used in Intel PXA270 reference designs.

How does the TPS65020RHAT handle battery backup for the real-time clock (RTC)?

The TPS65020RHAT integrates automatic switchover between VSYSIN and VBACKUP inputs to sustain VRTC output during main battery depletion. When VSYSIN falls below 2.55 V (±3%), the internal switch connects VBACKUP to VRTC, delivering 3 V @ 20 mA. The TPS65020RHAT monitors both inputs using dedicated comparators with 50 mV hysteresis and asserts PWRFAIL when either drops out-of-spec.

What is the purpose of the TRESPWRON pin on the TPS65020RHAT?

The TRESPWRON pin on the TPS65020RHAT accepts an external timing capacitor to program the duration of the active-low RESPWRON reset pulse. With a 1-nF capacitor, the TPS65020RHAT generates a precise 100-ms reset signal - critical for ensuring reliable initialization of companion SoCs like OMAP1710. The internal constant-current source (2 µA typical) charges the capacitor to set this delay.

Can the TPS65020RHAT operate with input voltages below 3.0 V?

Yes, the TPS65020RHAT supports input voltages as low as 2.5 V on VINDCDC1/VINDCDC2/VINDCDC3 and VCC pins, enabling operation down to end-of-discharge for single-cell Li-ion batteries. Its UVLO threshold is 2.35 V (±2%) with 120 mV hysteresis, and the TPS65020RHAT maintains regulation across the full 2.5–6.0 V range with no performance degradation in efficiency or accuracy.