Texas Instruments TPS65161BPWPR

Overview

TPS65161BPWPR from Texas Instruments is a highly integrated bias power supply IC for TFT LCD panels, delivering four regulated rails: VS (up to 19 V/1.3 A), V(LOGIC) (3.3 V/2.3 A), VGH (+32 V/50 mA), and VGL (−5 V/50 mA). It integrates a 750-kHz boost converter, 500-kHz step-down converter, and dual regulated charge pumps - all synchronized to a single clock. Designed for large-screen LCD TVs and monitors, it supports adjustable sequencing and external MOSFET gate drive for isolation.

For engineers reviewing the TPS65161BPWPR datasheet, TPS65161BPWPR pinout, TPS65161BPWPR application, or TPS65161BPWPR equivalent, key selection criteria include its 3.7-A boost switch current limit, 200-mA charge pump output capability, 8–14.7-V input range, HTSSOP-28 PowerPAD™ package with thermal pad tied to PGND, and programmable 500/750-kHz switching frequency via FREQ pin.

Technical Context

The TPS65161BPWPR employs a voltage-mode PWM architecture with input voltage feedforward in both boost and buck converters, enabling tight line/load regulation (0.03%/A typical) and stable operation with ceramic output capacitors. Its unique boost topology uses an internal P-MOSFET (rDS(on) ≤16 Ω) in parallel with an external Schottky diode to sustain continuous conduction mode across full load range - eliminating light-load ringing and simplifying compensation.

All four power rails share a central clock; FREQ pin selects 500 kHz (low) or 750 kHz (high), directly affecting efficiency vs. transient response trade-off. Sequencing is controlled by DLY1/DLY2 pins (capacitor-programmable delays), while GD provides open-drain gate drive latched low when VS reaches ±8% regulation - enabling external MOSFET control for VS/VGH isolation.

Key Specifications

Pinout & Package

TPS65161BPWPR is housed in a thermally enhanced 28-pin HTSSOP (PWP) package with exposed PowerPAD™ soldered to PGND for optimal thermal performance. Pin numbering follows standard TI HTSSOP layout; Pin 1 is FB (top-left corner), and Pin 28 is SS (bottom-right corner). The PowerPAD must be electrically and thermally connected to PGND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65161APWPR, TPS65161BPWPR adds 200-mA charge pump drive and higher UVLO for improved reliability in noisy 12-V systems; versus TPS65165PWPR, it retains full sequencing control and GD functionality essential for high-end LCD TV power trees.

Availability

TPS65161BPWPR is available at Aetrix Electronics and suitable for large-screen LCD TV panels, desktop monitor TFT displays, and industrial HMI modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS65161BPWPR 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 display power solutions.

The TPS65161 family was designed specifically for TFT LCD panel bias supplies - integrating boost, buck, and dual charge pumps into one IC to replace multi-chip solutions in TV and monitor applications.

FAQ

What is the maximum output voltage and current capability of the VS rail on the TPS65161BPWPR?

The TPS65161BPWPR supports a VS output voltage up to 19 V with a maximum continuous output current of 1.3 A. This is enabled by its 3.7-A N-MOSFET switch current limit (Q1), internal overvoltage protection at 20 V, and thermal design rated for 1.42 W at 85°C ambient. The VS rail powers TFT source drivers and is regulated via the FB pin with 1.146-V feedback threshold.

How does the TPS65161BPWPR differ from the TPS65161PWP in terms of charge pump performance?

The TPS65161BPWPR delivers 200-mA drive current to both VGH and VGL charge pumps - double the 100-mA capability of the base TPS65161PWP. This enables higher load currents on bias rails without external amplification, critical for larger panels. The TPS65161BPWPR also features an elevated 8-V undervoltage lockout threshold versus 6 V on the TPS65161PWP, improving system robustness during input transients.

Can the TPS65161BPWPR support adjustable power sequencing between VLOGIC, VGL, VS, and VGH?

Yes, the TPS65161BPWPR supports fully adjustable sequencing using external capacitors on DLY1 and DLY2 pins. DLY1 sets the delay from V(LOGIC) regulation to VGL activation; DLY2 sets the delay from V(LOGIC) regulation to VS/VGH startup. This prevents panel damage due to improper voltage ramp order - a critical requirement for TFT LCDs where VGL must be established before VGH and VS.

What package type and thermal characteristics does the TPS65161BPWPR use?

The TPS65161BPWPR uses the HTSSOP-28 (PWP) package with an exposed PowerPAD™ thermally connected to PGND. With proper PCB copper pour, it achieves a junction-to-ambient thermal resistance (RθJA) of 28°C/W. At 85°C ambient, its maximum allowable power dissipation is 1.42 W - sufficient for full-load operation in well-ventilated LCD TV backlights and monitor enclosures.

Does the TPS65161BPWPR include protection features for system reliability?

Yes, the TPS65161BPWPR integrates multiple protection features: overvoltage protection (20 V on VS), thermal shutdown (155°C with 5°C hysteresis), cycle-by-cycle short-circuit protection on the buck converter, and undervoltage lockout (6.4 V falling, 8 V rising). These ensure safe operation during fault conditions such as feedback disconnection, output overload, or ambient overheating - critical for unattended LCD TV deployments.