Texas Instruments TPS65145PWP

Overview

TPS65145PWP from Texas Instruments is a triple-output LCD power supply IC integrating a 1.6-MHz boost converter (VO1 up to 15 V / 400 mA), regulated negative charge pump (VO2 down to –12 V / 20 mA), positive charge pump (VO3 up to 30 V / 20 mA), and 3.3-V linear regulator controller - designed specifically for TFT LCD source/gate driver biasing in portable displays.

For engineers reviewing the TPS65145PWP datasheet, TPS65145PWP pinout, TPS65145PWP application, or TPS65145PWP equivalent, key selection criteria include its 1.37-A internal switch current limit (distinct from TPS65140/TPS65141), fault-detection shutdown behavior, HTSSOP-24 package with PowerPAD™ thermal interface, and integrated power-good monitoring across all three outputs.

Technical Context

The TPS65145PWP implements a fixed-frequency voltage-mode PWM boost converter with virtual synchronous operation using an external Schottky diode and internal P-MOSFET (rDS(on) = 9–22 Ω), enabling continuous conduction mode across full load range. Its feedback regulation uses a 1.213-V internal reference and 1.146-V FB1 threshold for VO1.

It integrates dual charge pumps: a negative pump with MODE-selectable doubler/tripler topology (C2–/MODE pin), and a positive pump with four internal switches (Q3–Q6) and Schottky diodes (D1–D4); both use SUP as input (tied to VO1) and feature ±10% output regulation thresholds triggering PG assertion and device shutdown on fault.

Key Specifications

Pinout & Package

TPS65145PWP is housed in a 24-pin HTSSOP (PWP) package with exposed thermal PowerPAD™ (7.80 mm × 4.40 mm), requiring solder connection to PGND for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LCD bias supply applications.

Compared with TPS65140PWP and TPS65141PWP, the TPS65145PWP provides the optimal balance of fault protection, thermal performance (37.2°C/W RθJA), and mid-power efficiency - making it the preferred choice for mainstream portable and industrial TFT LCD designs requiring reliable shutdown behavior.

Availability

TPS65145PWP is available at Aetrix Electronics and suitable for TFT LCD notebooks, automotive infotainment panels, and industrial HMI touchscreens requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for TPS65145PWP 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 over 90 years of innovation in high-reliability power solutions.

The TPS6514x product line was engineered to consolidate multiple LCD bias rails into a single IC for portable and automotive displays - reducing board area, improving startup sequencing control, and enhancing system-level fault resilience.

FAQ

What is the maximum output current capability of the TPS65145PWP's VO1 boost converter?

The TPS65145PWP's VO1 boost converter delivers up to 400 mA at its rated output voltage. This is enabled by its 1.37-A typical internal N-MOSFET switch current limit and optimized thermal design in the HTSSOP-24 PowerPAD™ package. The actual achievable current depends on input voltage, output voltage, ambient temperature, and PCB layout - with derating required above 85°C ambient per the 37.2°C/W RθJA specification.

How does the TPS65145PWP differ from the TPS65141PWP in fault response?

The TPS65145PWP enters full shutdown whenever VO1, VO2, or VO3 falls outside its ±10% regulation window - a safety feature absent in the TPS65141PWP. The TPS65141PWP continues operating even when one output is out-of-regulation, making it unsuitable for applications requiring strict panel protection. This distinction is hardwired and cannot be configured via pins or registers.

Can the TPS65145PWP generate both positive and negative gate drive voltages simultaneously?

Yes, the TPS65145PWP simultaneously generates VO2 (negative, down to –12 V) and VO3 (positive, up to 30 V) from the same SUP input derived from VO1. Its internal charge pump architecture uses separate feedback loops (FB2 for VO2, FB3 for VO3) and independent switching control - allowing concurrent, regulated high-voltage outputs essential for TFT LCD gate driver biasing.

What external components are mandatory for basic TPS65145PWP operation?

Mandatory external components for TPS65145PWP include: a 4.7-µH power inductor between VIN and SW; a Schottky diode (e.g., RB050M-30) from SW to VO1; two 220-nF ceramic flying capacitors (C1+, C1– and C2+, C2–); feedback resistors for VO1 (FB1), VO2 (FB2), VO3 (FB3), and VO4 (FB4); and an external NPN/PNP transistor (e.g., BCP68) for the 3.3-V linear regulator output.

Does the TPS65145PWP require special PCB layout considerations for thermal management?

Yes - the TPS65145PWP's exposed PowerPAD™ thermal pad must be soldered to a solid PGND copper plane with ≥4 thermal vias (0.3-mm diameter) connecting to inner/ground layers. TI specifies minimum 200 mm² copper area under the pad; insufficient thermal relief causes junction temperatures to exceed 125°C at full load, triggering thermal shutdown and compromising reliability.