Texas Instruments TPS658621AZGUT

Overview

TPS658621AZGUT from Texas Instruments is an advanced power management unit (PMU) integrating battery charging, three programmable step-down converters (max 1.2A), eleven LDOs, an 11-channel ADC, dual RGB LED drivers, and a constant-current WLED driver. It supports dual-input power path with USB current limiting, 18V over-voltage protection, and I²C-controlled system management for handheld devices.

For engineers reviewing the TPS658621AZGUT datasheet, TPS658621AZGUT pinout, TPS658621AZGUT application, or TPS658621AZGUT equivalent, key selection considerations include its 169-pin MICROSTAR BGA (ZGU) package, dynamic thermal foldback, programmable charge current up to 1A, hardware on/off control, and integrated display support functions including four PWM outputs and brightness-controlled WLED driving.

Technical Context

The TPS658621AZGUT implements a dual-input power path architecture supporting both adapter and USB inputs with independent current limiting and automatic source selection. Its power supplies include three synchronous buck converters operating in forced PWM or automatic power-saving mode, plus eleven factory-configurable LDOs-seven fixed at 1.25V–3.3V, two adjustable from 0.725V–1.5V or 1.25V–2.586V, one always-on LDO (1.25V–3.3V), and one dedicated 1.70V–2.475V LDO.

System-level intelligence includes an 11-channel ADC with single-conversion, peak-detection, and averaging modes; maskable interrupt controller; software reset; hardware reboot; and I²C interface with full register access for status monitoring, fault handling, and real-time configuration of supply voltages, LED currents, and PWM parameters.

Key Specifications

Pinout & Package

TPS658621AZGUT is housed in a 6mm × 6mm, 169-ball MICROSTAR BGA (package drawing ZGU) with 0.4mm ball pitch and Q1 pin-1 quadrant orientation. The package complies with JEDEC MSL Level-3 (260°C, 168-hour floor life) and features SnAgCu (SNAGCU) lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS658621AZGUT, TPS659122YFFT offers greater regulator count and wider input range but removes WLED integration, while MAX8649ETE+T trades system-level functionality for minimal footprint and cost-making TPS658621AZGUT optimal for mid-tier handhelds needing balanced integration of power, battery, and display.

Availability

TPS658621AZGUT is available at Aetrix Electronics and suitable for smartphones, portable navigation devices, portable media players, and tablet accessories requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS658621AZGUT 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, designing and manufacturing analog, embedded processing, and digital signal processing technologies since 1930.

The TPS658621A belongs to TI's handheld power management product line, engineered specifically to consolidate charging, multi-rail DC/DC conversion, system monitoring, and display driving into a single compact PMU for battery-powered consumer electronics.

FAQ

What is the maximum input voltage supported by the TPS658621AZGUT?

The TPS658621AZGUT supports up to 18V on its VIN1 input pin for adapter operation, with built-in over-voltage protection that clamps and disables the input path above this threshold. VIN2 (USB input) is rated for standard 5V USB compliance and includes programmable current limiting to prevent port overload. This dual-input architecture allows safe operation across both wall adapter and USB power sources without external protection circuitry.

Does the TPS658621AZGUT include a battery fuel gauge function?

The TPS658621AZGUT does not implement a Coulomb counter or model-based fuel gauge algorithm. However, it integrates an 11-channel ADC capable of measuring battery voltage, temperature, and system load-enabling host software to estimate state-of-charge using external calibration tables or simplified voltage-based algorithms. Accurate fuel gauging requires host-side computation, not on-chip estimation.

Can the TPS658621AZGUT drive both RGB and WLED backlights simultaneously?

Yes, the TPS658621AZGUT can drive RGB and WLED backlights concurrently. It provides four programmable PWM outputs for RGB LED control and a dedicated constant-current WLED driver supporting up to 26.5V at 25mA. These functions operate independently under I²C command, allowing simultaneous brightness control of color displays and white backlighting without resource contention or timing conflict.

What is the thermal foldback behavior of the TPS658621AZGUT during charging?

During charging, the TPS658621AZGUT implements dynamic thermal foldback: when die temperature exceeds 115°C, the device automatically reduces charge current in real time to maintain safe junction temperature. This behavior is fully analog and requires no host intervention. Once temperature falls below 105°C, charge current ramps back toward the programmed value-ensuring continuous, thermally aware charging without shutdown or manual reset.

Is the TPS658621AZGUT pin-compatible with earlier TPS658621 variants?

The TPS658621AZGUT is pin-compatible with the TPS658621AZGUR and other members of the TPS658621 family sharing the ZGU package. All variants use identical 169-ball MICROSTAR BGA layout, mechanical footprint, and thermal pad configuration. Functional differences (e.g., factory-configured LDO voltages) do not affect physical compatibility, enabling drop-in replacement in existing PCB designs where firmware and register initialization match the variant's configuration.