Texas Instruments TPS92518HVPWPT

Overview

TPS92518HVPWPT from Texas Instruments is a dual-channel buck LED controller with SPI interface, designed for high-precision current regulation in automotive and industrial LED lighting systems. It supports 6.5 V to 65 V input, delivers independent quasi-hysteretic control per channel, enables 10,000:1 PWM dimming, and integrates high-side differential current sensing with programmable peak threshold (255 mV typ), off-time (4.1 µs typ at 30 V), and thermal monitoring.

For engineers reviewing the TPS92518HVPWPT datasheet, TPS92518HVPWPT pinout, TPS92518HVPWPT application, or TPS92518HVPWPT equivalent, this page provides verified functional identity, validated 24-pin HTSSOP package mapping, confirmed dual-buck topology with shunt-FET dimming support, real-world thermal shutdown (175°C), and SPI-configurable analog/PWM dimming parameters critical for adaptive headlamp and color-mixing designs.

Technical Context

The TPS92518HVPWPT implements quasi-hysteretic constant-off-time (COFT) control with voltage-proportional off-time scaling - t_OFF ∝ V_LEDx - enabling stable ΔI_L-PP regulation across 1 kHz–2 MHz switching frequencies. Each channel features independent 8-bit DAC-programmable peak current threshold (VCSTx), off-time (LEDx_TOFF_DAC), and maximum off-time (LEDx_MAXOFF_DAC).

Its SPI interface supports full register read/write access for fault reporting (thermal, UVLO, overcurrent), ADC-based V_LEDx and die temperature monitoring, and digital calibration. The device uses high-side differential current sense (CSPx/CSNx) with 10× internal gain, cycle-by-cycle current limiting, and dedicated EN/UV pin supporting both enable and bypass modes (>23.6 V).

Key Specifications

Pinout & Package

TPS92518HVPWPT is housed in a thermally enhanced 24-pin HTSSOP (PWP) package (7.7 mm × 4.4 mm, 0.65 mm pitch) with exposed thermal pad connected to GND for optimal power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel LED controller applications.

Compared with TPS92518HVPWPT, the TPS92612QPWPRQ1 offers automotive qualification but sacrifices SPI programmability and shunt-FET dimming control, while the LM3423MH/NOPB provides higher input voltage tolerance but lacks dual-channel coordination, digital dimming, and system-level diagnostics essential for adaptive lighting.

Availability

TPS92518HVPWPT is available at Aetrix Electronics and suitable for automotive adaptive headlamps, RGB color-mixing systems, and industrial projector light engines requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS92518HVPWPT 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 experience in automotive and industrial LED driver innovation.

The TPS92518 family was developed specifically for high-performance, digitally configurable LED lighting in demanding environments - emphasizing SPI-based flexibility, thermal robustness, and dual-channel synchronization for adaptive and color-critical applications.

FAQ

What is the maximum input voltage supported by the TPS92518HVPWPT?

The TPS92518HVPWPT supports an absolute maximum input voltage of 67 V and a recommended operating range of 6.5 V to 65 V. This high-voltage capability enables direct connection to 48 V industrial buses and automotive battery systems including load-dump transients. The device's internal protection circuitry - including VIN-to-GND absolute maximum rating and robust EN/UV pin thresholds - ensures reliable operation without external clamping components in most 12 V/24 V/48 V applications.

How does the TPS92518HVPWPT achieve 10,000:1 PWM dimming?

The TPS92518HVPWPT achieves 10,000:1 PWM dimming through dedicated hardware PWM inputs (PWM1/PWM2) with sub-100 ns propagation delay and internal synchronization with the buck switching cycle. Its quasi-hysteretic architecture avoids loop instability at ultra-low duty cycles, and the absence of external compensation allows consistent edge timing across temperature and load. This enables precise, flicker-free dimming down to 0.01% duty cycle - a capability verified in TI's EVM testing and documented in the SLUSCR7 datasheet Section 1.

Can the TPS92518HVPWPT operate without SPI configuration?

Yes, the TPS92518HVPWPT can operate without SPI configuration. When the EN/UV pin is biased above 23.6 V, the device enters SPI-bypass mode and loads factory-default register values - including fixed peak current threshold, off-time, and dimming settings. This allows immediate operation in basic buck mode, though full functionality (e.g., thermal monitoring, fault reporting, and digital dimming calibration) requires SPI initialization. The default mode is intended for evaluation and fail-safe startup scenarios.

What is the purpose of the VLED1 and VLED2 pins on the TPS92518HVPWPT?

The VLED1 and VLED2 pins on the TPS92518HVPWPT serve as output voltage sense inputs that directly set the converter's off-time duration. By connecting these pins to the LED string cathode (via appropriate resistive divider if needed), the device scales t_OFF proportionally to V_LEDx, maintaining constant peak-to-peak inductor current ripple (ΔI_L-PP) across varying LED forward voltages. This eliminates the need for external compensation and ensures stable regulation in both CCM and DCM - a core feature of its quasi-hysteretic COFT architecture.

Does the TPS92518HVPWPT include thermal protection?

Yes, the TPS92518HVPWPT includes comprehensive thermal protection: a dedicated thermal shutdown circuit triggers at 175°C (with 10°C hysteresis) to disable both channels, and an integrated die temperature ADC (VTHERM register) provides real-time junction temperature readings via SPI. This dual-layer approach enables both hard shutdown for safety and soft derating strategies - for example, reducing LED current based on VTHERM data before reaching critical temperature. Thermal metrics (R_θJA = 32.5°C/W) are specified for the 24-pin HTSSOP package with proper PCB layout.