Texas Instruments TPS65161APWPR

Overview

TPS65161APWPR 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 in a single HTSSOP-28 package with PowerPAD™ thermal enhancement.

For engineers reviewing the TPS65161APWPR datasheet, TPS65161APWPR pinout, TPS65161APWPR application, or TPS65161APWPR equivalent, this device supports precise sequencing control (DLY1/DLY2), internal soft start (SS), gate drive (GD) for external MOSFET isolation, overvoltage protection (OS), and thermal shutdown - critical for large-screen monitor and LCD TV power architectures.

Technical Context

The TPS65161APWPR 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 stable operation with ceramic output capacitors. Its central clock generator supports fixed 500 kHz or 750 kHz switching via the FREQ pin, synchronizing all converters and charge pumps.

It features dual independent charge-pump regulators: a positive pump (DRP/FBP) sourcing up to 50 mA at VGH, and a negative pump (DRN/FBN) sinking up to 50 mA at VGL - both with adjustable feedback thresholds and programmable startup delays. The GD open-drain output latches low when VS reaches regulation, enabling controlled external MOSFET switching for input-output isolation.

Key Specifications

Pinout & Package

TPS65161APWPR is housed in a thermally enhanced 28-pin HTSSOP (PWP) package with exposed PowerPAD™ connected to PGND for optimal thermal performance. Pin count and layout match TI's SLVS617E datasheet revision March 2013.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65161APWPR, the TPS65161PWPR offers reduced current headroom but lower cost, while the TPS65161BPWPR adds charge-pump current and UVLO robustness - making the 'A' variant the optimal balance of performance, thermal margin, and compatibility for mainstream 12-V LCD TV/monitor designs.

Availability

TPS65161APWPR is available at Aetrix Electronics and suitable for large-screen LCD monitors, LCD televisions, and industrial HMI displays requiring stable component supply, consistent thermal performance, and long-lifecycle availability.

Supply support for TPS65161APWPR 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 biasing - integrating boost, buck, and dual charge-pump regulation into one IC to replace multi-chip power trees in consumer and industrial displays.

FAQ

What is the maximum output voltage and current capability of the VS rail in TPS65161APWPR?

The TPS65161APWPR supports a VS output voltage up to 19 V with a continuous current capability of 1.3 A. This is enabled by its 3.7-A peak N-MOSFET switch current limit (Q1), internal overvoltage protection clamping at 20 V, and thermal design validated for 1.42 W power dissipation at 85°C ambient. The VS rail is intended to power TFT source driver ICs in large-panel applications.

How does the GD pin function in TPS65161APWPR, and what external circuitry is required?

The GD pin in TPS65161APWPR is an open-drain gate drive output that latches low when the VS output reaches regulation (within 8% of target). It remains latched until EN2 is cycled low. To use GD, connect it to the gate of an external N-channel MOSFET (e.g., CSD18532KCS) placed in series with VS or VGH. A pull-up resistor (typically 10 kΩ to AVIN) is required to enable high-impedance state during startup or fault.

Can TPS65161APWPR generate both positive and negative bias voltages simultaneously, and how are they configured?

Yes, TPS65161APWPR simultaneously generates VGH (+32 V/50 mA) and VGL (−5 V/50 mA) using dedicated regulated charge pumps. VGH is set via resistor divider on FBP (e.g., R5=560 kΩ, R6=22 kΩ), while VGL is set via divider on FBN (e.g., R3=620 kΩ, R4=150 kΩ). Both outputs feature independent soft-start delays (DLY1/DLY2) and maintain regulation across load and temperature per datasheet specs.

What is the role of the FREQ pin in TPS65161APWPR, and how does frequency selection affect system performance?

The FREQ pin in TPS65161APWPR selects the internal oscillator frequency: logic high = 750 kHz, logic low = 500 kHz. A higher frequency allows smaller magnetics and faster transient response but increases switching losses. At 750 kHz, the TPS65161APWPR achieves optimal efficiency for 12-V input and 15-V VS output, as confirmed in Figure 1 of SLVS617E, with peak efficiency >88% at 1.2-A load.

Does TPS65161APWPR include protection features, and how are they implemented?

Yes, TPS65161APWPR includes overvoltage protection (monitored via OS pin, trips at 20 V), thermal shutdown (155°C with 5°C hysteresis), short-circuit protection on the step-down converter (cycle-by-cycle current limiting), and undervoltage lockout (6.4-V threshold). All protections are internal and require no external components - ensuring robust operation in unattended display systems.