Texas Instruments TPS61045DRBTG4

Overview

TPS61045 from Texas Instruments is a digitally adjustable high-frequency boost converter IC designed for LCD bias and OLED display power supply applications. It operates from 1.8 V to 6 V input, delivers up to 28 V output, features true shutdown with 0.1 µA shutdown current, integrates a 6-bit DAC for digital voltage programming via CTRL pin, and uses PFM peak-current control with 375 mA typical current limit.

For engineers reviewing the TPS61045 datasheet, TPS61045 pinout, TPS61045 application, or TPS61045 equivalent, key selection considerations include its 1 MHz max switching frequency enabling compact 4.7 µH inductor use, 1.233 V internal reference with ±25 mV feedback trip tolerance, 40 µA no-load quiescent current, thermal shutdown at ~160°C, and VSON-8 (3 mm × 3 mm) package with exposed thermal pad tied to PGND.

Technical Context

The TPS61045 employs pulse-frequency modulation (PFM) with constant peak-current control, where the main switch (Q2) turns off when inductor current reaches 375 mA (typical) or after 6 µs maximum on-time. Regulation occurs in discontinuous conduction mode (DCM), making switching frequency load-, input-, and output-dependent - enabling >85% efficiency across full load range without external compensation.

Its dual-function CTRL pin enables device startup/shutdown and provides digital step-up/down control of the 6-bit DAC output (DO), which drives an external feedback network to adjust output voltage in 19.6 mV steps. The DO pin's center voltage is 607 mV at startup, and the internal 1.233 V reference sets feedback trip point with ±25 mV variation over temperature and input voltage.

Key Specifications

Pinout & Package

The TPS61045 is housed in an 8-pin VSON (DRB) package measuring 3.00 mm × 3.00 mm with an exposed thermal pad connected to PGND. This thermally enhanced package requires direct PCB copper connection to PGND for reliable power dissipation under 10 mA output loads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61045, TPS61042DRBT removes digital adjustability but offers drop-in compatibility for fixed-output designs, while MAX17065ETA+ adds I²C configurability at the cost of larger footprint and higher IQ - making TPS61045 optimal for cost-sensitive, space-limited, digitally tuned display bias.

Availability

TPS61045 is available at Aetrix Electronics and suitable for LCD bias supply, OLED display power, and portable diagnostic tool applications requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade traceability.

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 ICs, with decades of expertise in high-efficiency DC/DC conversion and display power solutions.

The TPS61045 belongs to TI's display bias power management product line, engineered specifically for low-power, digitally programmable high-voltage generation in portable LCD and OLED systems - emphasizing minimal solution size, ultra-low IQ, and robust thermal performance.

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 by electrical characteristics. This limit is enforced by the internal main switch (Q2) voltage rating of 30 V and the device's PFM control architecture. Operation beyond 28 V risks violating the 30 V V_SW rating and may trigger overvoltage protection or cause reliability degradation. The TPS61045 datasheet explicitly states "Output Voltage of up to 28 V Possible" in its Features section.

How does the CTRL pin function in the TPS61045?

The CTRL pin in the TPS61045 serves two distinct roles: device enable/disable and digital output voltage programming. Pulling CTRL high enables the device with soft-start; pulling it low ≥560 µs shuts down the TPS61045 with 0.1 µA current draw. Pulses of 1–60 µs or 140–240 µs on CTRL increment or decrement the internal 6-bit DAC output (DO), adjusting V_OUT in 19.6 mV steps. This dual functionality is documented in Section 7.3.3 and Table 2 of the TPS61045 datasheet.

What inductor value is recommended for the TPS61045?

Texas Instruments recommends a 4.7 µH inductor as the default value for the TPS61045, as stated in Section 6.3 (Recommended Operating Conditions) and validated in the Typical Application schematic. Inductor values between 2.2 µH and 47 µH are acceptable, but 4.7 µH balances switching frequency, efficiency, and solution size. The selected inductor must sustain ≥450 mA saturation current (max ILIM) and exhibit low DC resistance to preserve efficiency - Sumida CDRH3D16-4R7 and Murata LQH32CN4R7M51 are cited as compatible parts.

Does the TPS61045 require external compensation components?

No, the TPS61045 does not require external compensation components. Its PFM peak-current control architecture operating in discontinuous conduction mode (DCM) is inherently stable, as confirmed in Sections 7.1 and 7.4 of the datasheet. The device regulates reliably with only the standard external components: input capacitor (C2 = 4.7 µF), output capacitor (C3 = 1 µF), inductor (L = 4.7 µH), feedback resistors (R1/R2/R3), and feed-forward capacitor (Cff = 22 pF). No loop compensation network is needed.

What is the purpose of the exposed thermal pad on the TPS61045 VSON package?

The exposed thermal pad on the TPS61045's VSON-8 (DRB) package is electrically and thermally connected to PGND, as specified in Pin Configuration and Functions. It must be soldered to a dedicated PGND copper area on the PCB to provide a low-thermal-resistance path for heat dissipation. With a junction-to-ambient thermal resistance (R_θJA) of 270°C/W on a standard 2-layer board, proper thermal pad connection is essential to maintain junction temperature below 125°C under 10 mA output load at 85°C ambient - preventing thermal shutdown and ensuring long-term reliability.