Texas Instruments TPS65811RTQT

Overview

TPS65811RTQT from Texas Instruments is a single-cell Li-ion battery and power management IC integrating charge management, nine LDOs (six adjustable, two fixed 3.3 V, one 1.5 V RTC backup), two 0.6–3.4 V programmable buck converters (750 mA each), RGB/white LED drivers, PWM outputs, GPIOs, ADC, and I²C interface. It serves as the central PMIC in handheld devices requiring compact, thermally enhanced power sequencing.

For engineers reviewing the TPS65811RTQT datasheet, TPS65811RTQT pinout, TPS65811RTQT application, or TPS65811RTQT equivalent, this page delivers verified electrical specs, validated QFN-56 pin mapping, confirmed thermal pad grounding requirement, real-world system management use cases, and two technically documented alternative parts for portable Li-ion systems.

Technical Context

The TPS65811RTQT implements dual-input power-path management with automatic AC/USB source selection, dynamic power path management (DPPM) to prevent system brownout during battery charging, and thermal foldback protection. Its integrated 8-channel ADC supports pack temperature sensing via TS pin and system parameter monitoring through ANLG1/ANLG2 inputs.

System-level control is enabled by an I²C interface supporting programmable output voltages, current thresholds, fault masking, and interrupt generation. The device operates in standalone mode using power-up defaults or under full host control - supporting both embedded firmware-driven and host-processor-managed power architectures.

Key Specifications

Pinout & Package

TPS65811RTQT uses an 8.00 mm × 8.00 mm QFN-56 package with exposed thermal pad. The thermal pad must be soldered to AGND1 on PCB for thermal and electrical integrity; it is not a primary ground return path. All AGND/PGND pins require dedicated plane connections.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65810RTQT, the TPS65811RTQT provides higher buck current headroom for demanding applications, while BQ24150ARHLT offers superior charge current but requires external regulation - making TPS65811RTQT optimal for integrated, space-constrained Li-ion systems needing full-feature PMIC capability.

Availability

TPS65811RTQT is available at Aetrix Electronics and suitable for smartphone power management, PDA system sequencing, MP3 player battery systems, and internet appliance power hubs requiring stable component supply across production lifecycles.

Supply support for TPS65811RTQT 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, signal chain, and microcontrollers.

The TPS6581x product line was designed specifically for handheld Li-ion devices requiring highly integrated, thermally efficient power management - combining battery charging, multiple regulated supplies, system monitoring, and display control in a single QFN package.

FAQ

What is the maximum continuous output current supported by each buck converter in the TPS65811RTQT?

The TPS65811RTQT supports 750 mA continuous output current per buck converter (SM1 and SM2). This rating is validated under recommended operating conditions with proper thermal design, including connection of the exposed thermal pad to AGND1 and adequate PCB copper area. Exceeding this current may trigger thermal foldback or cause junction temperature to exceed 125°C, leading to automatic shutdown.

How does the DPPM (Dynamic Power Path Management) function operate in the TPS65811RTQT?

The DPPM function in the TPS65811RTQT maintains stable system voltage during battery charging by dynamically adjusting input current limit based on battery voltage and system load. When system load increases and battery voltage drops, DPPM reduces charge current to prioritize system power - preventing brownout. The DPPM threshold is set externally via resistor on the DPPM pin and blanking delay is controlled by capacitor value.

Can the TPS65811RTQT operate without an I²C host controller?

Yes, the TPS65811RTQT can operate in standalone mode using factory-programmed power-up defaults for all regulators, charge parameters, and system settings. Default configurations include SM1/SM2 enabled via GPIO1/GPIO2, 4.2 V charge voltage, and standard power-path behavior. Full functionality - such as dynamic voltage scaling, fault logging, and custom sequencing - requires I²C host control.

What is the purpose of the thermal pad on the TPS65811RTQT QFN package?

The exposed thermal pad on the TPS65811RTQT QFN package provides critical thermal conduction from the die to the PCB, reducing junction-to-board thermal resistance to 4.9°C/W. It must be soldered to AGND1 on the PCB and cannot serve as the primary ground return path. AGND1 and all other AGND/PGND pins must be independently connected to clean ground planes to ensure signal integrity and thermal performance.

Which pins on the TPS65811RTQT support analog sensing for battery temperature monitoring?

The TS pin (Pin 12) is dedicated to battery temperature sensing via connection to an NTC thermistor, while ANLG1 (Pin 24) and ANLG2 (Pin 23) provide additional analog inputs configurable for voltage or current monitoring. All three pins feed into the integrated 8-channel, 10-bit ADC - enabling simultaneous measurement of battery temperature, system input voltage, and auxiliary parameters without external components.