Texas Instruments TPS65161PWPR

Overview

TPS65161PWPR 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 boost converter, step-down converter, and dual charge pumps in a single HTSSOP-28 PowerPAD package, targeting large-screen monitors and LCD TVs requiring compact, high-current panel bias solutions.

For engineers reviewing the TPS65161PWPR datasheet, TPS65161PWPR pinout, TPS65161PWPR application, or TPS65161PWPR equivalent, key selection criteria include its 2.8-A N-MOSFET switch current limit, 500/750-kHz selectable switching frequency, adjustable sequencing via DLY1/DLY2 pins, internal 1.213-V reference, and thermal shutdown at 155°C - all critical for stable TFT panel power-up and fault resilience.

Technical Context

The TPS65161PWPR implements a voltage-mode PWM architecture with input voltage feedforward for both its main boost (VS) and step-down (V(LOGIC)) converters, enabling tight line/load regulation (0.03%/A typical) and compatibility with ceramic output capacitors. Its central clock drives all switching stages synchronously, with FREQ pin selection determining fixed 500 kHz (low) or 750 kHz (high) operation across boost, buck, and charge pumps.

Sequencing is controlled by two independent delay timers (DLY1, DLY2), each charged by 4.8-μA current sources, allowing precise timing between V(LOGIC) ramp-up, VGL activation, and subsequent VS/VGH enablement. The GD open-drain gate drive signal latches low when VS reaches ±8% of regulation, enabling external MOSFET isolation for safety-critical rail management.

Key Specifications

Pinout & Package

TPS65161PWPR is housed in a thermally enhanced 28-pin HTSSOP package (PWP) with exposed PowerPAD™ soldered to PGND for efficient heat dissipation. Pin count and layout match TI's standard TPS65161 family footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65161PWPR, the TPS65161APWP offers higher boost current without changing layout or sequencing, while the TPS65161BPWP adds both higher charge-pump drive and elevated UVLO - making it suitable for wider input ranges and more demanding panel bias loads.

Availability

TPS65161PWPR is available at Aetrix Electronics and suitable for large-screen LCD monitor, LCD television, and industrial display applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS65161PWPR 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 and embedded processing technologies, with decades of expertise in power management ICs for display and consumer electronics.

The TPS65161 family was designed specifically to consolidate TFT LCD panel bias power into a single IC, addressing the space, thermal, and sequencing challenges of modern monitor and TV power architectures.

FAQ

What is the maximum output voltage and current capability of the VS rail on the TPS65161PWPR?

The TPS65161PWPR supports a VS output voltage up to 19 V, limited by its 20-V overvoltage protection threshold. Its maximum continuous output current is 1.3 A, enabled by the 2.8-A N-MOSFET switch current limit and thermal design of the HTSSOP-28 PowerPAD™ package. This rating assumes proper PCB layout with adequate copper area for the PowerPAD™ and input/output capacitors rated for ripple current.

How does the TPS65161PWPR implement power sequencing between V(LOGIC), VGL, VS, and VGH?

The TPS65161PWPR uses two dedicated timing pins - DLY1 and DLY2 - each sourcing a 4.8-μA current to charge external capacitors. DLY1 sets the delay between V(LOGIC) reaching regulation and VGL activation; DLY2 sets the delay between V(LOGIC) regulation and VS/VGH enablement via EN2. This ensures safe, controlled ramp-up to prevent TFT panel damage from out-of-sequence bias application.

Can the TPS65161PWPR operate from a 15-V input supply?

No - the TPS65161PWPR has a 6-V undervoltage lockout threshold and a maximum input voltage rating of 14.7 V on VINB and AVIN pins. Applying 15 V exceeds the absolute maximum rating and risks permanent damage. For 15-V systems, the TPS65161BPWP variant (8-V UVLO, 14.7-V max input) is the appropriate alternative.

What is the function of the GD pin on the TPS65161PWPR, and how is it used in system design?

GD is an open-drain gate drive output that latches low when the VS rail reaches ±8% of its regulated value. It is used to control an external P-channel MOSFET placed in series with VS or VGH to provide input-to-output isolation during faults or shutdown. The GD signal remains latched until EN2 is cycled low, enabling fail-safe rail management in mission-critical displays.

Does the TPS65161PWPR require external compensation components for its boost converter?

Yes - the TPS65161PWPR uses external loop compensation via the COMP pin (Pin 2). A small capacitor and optionally a series resistor are connected from COMP to PGND to stabilize the boost converter's voltage-mode control loop. Compensation values depend on inductor value, output capacitance, and desired phase margin; TI's SLVS617E datasheet provides design equations and example values for common configurations.