Texas Instruments TPS65651RTET

Overview

TPS65651RTET from Texas Instruments is a triple-output AMOLED display power supply IC integrating synchronous boost (AVDD), synchronous inverting buck-boost (ELVSS), and boost (ELVDD) converters. It delivers 6.1 V / 80 mA, 4.6 V / 300 mA, and ±2.5 V / 300 mA outputs from a 2.9–4.5 V input, supporting compact smartphones and ≤8" active-matrix OLED displays.

For engineers reviewing the TPS65651RTET datasheet, TPS65651RTET pinout, TPS65651RTET application, or TPS65651RTET equivalent, key selection considerations include programmable output voltages via single-wire digital interface, ±20% overcurrent protection per rail, VI-to-VO isolation, and WQFN-16 thermal performance in space-constrained portable designs.

Technical Context

The TPS65651RTET implements three independent regulated power rails using synchronous switching topologies: a boost converter for AVDD (5.8–7.9 V, 1% accuracy), a boost converter for ELVDD (4.6–5.0 V, 0.5% accuracy), and an inverting buck-boost for ELVSS (–5.4 to –1.4 V, 1.2% accuracy at –2.5 V). All converters feature VI-to-VO and VO-to-VI isolation.

Control is managed through a single-wire digital interface (CTRL pin) enabling stepwise programming of all three output voltages. The device includes short-circuit protection, thermal shutdown, external sensing (SNS1), and discharge enable functionality - critical for safe OLED panel bias sequencing and load transient response.

Key Specifications

Pinout & Package

TPS65651RTET uses a 3 mm × 3 mm, 0.75 mm height, 16-pin WQFN package with exposed thermal pad (RTE drawing). Pin assignment supports compact layout with dedicated power, ground, control, and sensing terminals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AMOLED display power supply applications.

Compared with TPS65651RTET, the TPS65652RTET offers factory-programmable outputs without runtime interface overhead, while the MAX17135ATL+T provides I²C configurability at the cost of added passive components and reduced isolation integrity - making TPS65651RTET optimal for cost-sensitive, space-constrained, and safety-critical OLED biasing.

Availability

TPS65651RTET is available at Aetrix Electronics and suitable for smartphones, small-size tablets, and active matrix OLED displays ≤8" requiring stable component supply, consistent parametric performance, and long-term production support.

Supply support for TPS65651RTET 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, embedded processing, and power management technologies, with decades of leadership in display power solutions.

The TPS6565x product line was designed specifically for AMOLED display biasing in portable consumer devices - integrating high-efficiency synchronous conversion, precise voltage accuracy, and compact packaging to replace multi-chip discrete solutions.

FAQ

What is the input voltage range supported by the TPS65651RTET?

The TPS65651RTET supports an input voltage range of 2.9 V to 4.5 V, optimized for single-cell lithium-ion or lithium-polymer batteries across their full discharge curve. This range ensures stable operation from full charge down to end-of-life cutoff without requiring external pre-regulation. The TPS65651RTET maintains regulation on all three outputs - AVDD, ELVDD, and ELVSS - across this entire input span.

How does the single-wire digital interface on the TPS65651RTET work?

The CTRL pin on the TPS65651RTET implements a proprietary single-wire digital interface that allows programming of AVDD, ELVDD, and ELVSS output voltages in discrete digital steps without I²C or SPI peripherals. Communication uses pulse-width encoding synchronized to an internal clock; each command sequence configures one rail's target voltage. The TPS65651RTET interprets these signals internally and adjusts its feedback references accordingly - reducing MCU GPIO usage and PCB routing complexity.

Does the TPS65651RTET provide overcurrent protection on all output rails?

Yes, the TPS65651RTET includes overcurrent protection on all three output rails: AVDD has 100 mA ±20% current limiting, while ELVDD and ELVSS each support 300 mA with cycle-by-cycle current limiting and automatic foldback. These protections activate independently per rail and do not affect other outputs. The TPS65651RTET also features thermal shutdown and short-circuit protection to safeguard against sustained overload conditions.

What is the purpose of the SNS1 pin on the TPS65651RTET?

On the TPS65651RTET, the SNS1 pin provides remote voltage sensing for the ELVDD output, enabling load-drop compensation to maintain regulation accuracy at the OLED panel connection point. It connects directly to the ELVDD load terminal, allowing the TPS65651RTET to adjust its output voltage dynamically to offset IR drop across PCB traces or connectors. This ensures ±10 mV regulation accuracy at the panel even under 300 mA load steps - critical for consistent pixel brightness in high-resolution AMOLED displays.

Is the TPS65651RTET pin-compatible with other members of the TPS6565x family?

The TPS65651RTET shares identical pinout, package (WQFN-16), and footprint with the TPS65652RTET and TPS65653RTET, enabling direct hardware reuse across variants. However, functional differences exist: the TPS65652RTET adds EEPROM-based factory programming, and the TPS65653RTET supports different default voltages and sequencing. The TPS65651RTET remains the baseline variant with runtime programmability via CTRL - all three maintain mechanical and electrical compatibility for drop-in replacement in most layouts.