Texas Instruments TPS61045DRBT

Overview

TPS61045 from Texas Instruments is a digitally adjustable, high-frequency boost converter IC designed for LCD bias and OLED display power supplies. It operates from 1.8 V to 6 V input, delivers up to 28 V output (programmable in 64 steps), features true shutdown with 0.1 μA quiescent current, and integrates peak-current-mode PFM control with 375 mA typical current limit - enabling compact, efficient power solutions in handheld and portable displays.

For engineers reviewing the TPS61045 datasheet, TPS61045 pinout, TPS61045 application, or TPS61045 equivalent, key selection considerations include its digital voltage programming via CTRL/DO interface, 1 MHz max switching frequency for small external components, 1.233 V internal reference, thermal shutdown at 160°C, and VSON-8 package compatibility with space-constrained display bias rails.

Technical Context

The TPS61045 uses pulse-frequency modulation (PFM) with constant peak-current control - turning on the main switch until inductor current reaches ~375 mA, then disabling it for a minimum off-time of 400 ns. Regulation relies on feedback comparison against a 1.233 V internal reference, with output voltage digitally adjusted via a 6-bit DAC driving the DO pin (0–1.233 V range, 19.6 mV/step).

Its dual-function CTRL pin enables both device enable/disable (logic-high = active, logic-low ≥560 μs = shutdown) and output voltage stepping (pulse width determines up/down direction). The integrated input switch (Q1) disconnects VIN from the system during shutdown, ensuring true load isolation - critical for controlled power sequencing in portable displays.

Key Specifications

Pinout & Package

TPS61045 is housed in an 8-pin VSON package (DRB variant), 3.00 mm × 3.00 mm body size, with exposed thermal pad connected to PGND for enhanced thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost converter applications.

Compared with TPS61045, TPS61042 offers lower BOM cost and simpler layout for fixed-voltage use cases, while MAX17065ETA+ provides richer digital control at the expense of added software overhead - making TPS61045 the optimal balance of programmability, simplicity, and integration for display bias in resource-constrained portable designs.

Availability

TPS61045 is available at Aetrix Electronics and suitable for LCD bias supply, OLED display power, and portable device power sequencing requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS61045 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 high-efficiency DC-DC conversion and display power solutions.

The TPS61045 belongs to TI's display bias and portable power management product line, engineered specifically for space- and efficiency-critical applications in handheld consumer electronics and industrial HMIs where programmable high-voltage generation is required.

FAQ

What is the maximum output voltage achievable with the TPS61045?

The TPS61045 supports a maximum output voltage of 28 V, as specified in its absolute maximum ratings and confirmed in the Electrical Characteristics table. This limit is enforced by the internal main switch (Q2) voltage rating and ensures safe operation with standard Schottky diodes like MBR0530. Actual usable output depends on external component selection - particularly inductor saturation current and output capacitor voltage rating - but 28 V represents the hard ceiling defined by the IC's architecture and process technology.

How does the TPS61045 achieve digital output voltage adjustment?

The TPS61045 implements digital output voltage adjustment using a 6-bit internal DAC that drives the DO pin (Pin 3) with a voltage ranging from 0 V to 1.233 V in 64 discrete steps (19.6 mV per step). This DAC voltage is injected into the external feedback divider network via resistor R3, effectively altering the effective resistance seen by the FB pin and thus shifting the regulated output voltage. The CTRL pin controls stepping direction and timing - a low pulse of 1–60 μs increases VO, while 140–240 μs decreases it - enabling precise, non-volatile voltage tuning without external controllers.

Does the TPS61045 support true load disconnection during shutdown?

Yes, the TPS61045 provides true load disconnection during shutdown. When the CTRL pin is held low for ≥560 μs, the internal input switch (Q1) opens completely, physically isolating the VIN supply from the rest of the circuit - including the inductor, SW node, and output capacitor. This prevents backfeed, eliminates leakage paths, and ensures zero output voltage at the VO rail. Measured shutdown current is just 0.1 μA typical, confirming full functional disablement of all switching elements and bias circuits in the TPS61045.

What is the recommended inductor value for typical TPS61045 applications?

Texas Instruments recommends a 4.7 μH inductor (e.g., Murata LQH32CN4R7M11 or Sumida CDRH3D16-4R7) as the default choice for most TPS61045 designs. This value balances switching frequency (typically ~800 kHz at 10 mA load), efficiency (>80%), and physical size - enabling compact layouts with standard 0805 or 1210 case sizes. Inductors between 2.2 μH and 10 μH are acceptable depending on trade-offs: lower values increase frequency and reduce size but decrease efficiency; higher values improve efficiency but risk exceeding the 6 μs maximum on-time limit at heavy loads.

Can the TPS61045 operate without using the digital programming feature?

Yes, the TPS61045 can operate as a standard fixed-output boost converter without engaging its digital programming feature. In this mode, the DO pin is left unconnected (floating), and the output voltage is set solely by the R1/R2 feedback divider using the standard equation VO = 1.233 V × (1 + R1/R2). TI recommends R2 ≤200 kΩ and R1 ≤2.2 MΩ to minimize quiescent current draw. All core functions - regulation, PFM control, softstart, and shutdown - remain fully operational, making the TPS61045 backward-compatible with legacy fixed-voltage designs while retaining upgrade path flexibility.