Texas Instruments TPS92512DGQR

Overview

TPS92512DGQR from Texas Instruments is a 2.5A step-down (buck) LED driver IC with integrated 200-mΩ high-side MOSFET, 4.5–42 V input range, ±5% LED current accuracy, and 100 kHz–2 MHz programmable switching frequency. It delivers stable constant-current drive for multi-LED strings in street lighting and industrial illumination systems.

For engineers reviewing the TPS92512DGQR datasheet, TPS92512DGQR pinout, TPS92512DGQR application, or TPS92512DGQR equivalent, key selection criteria include analog/PWM dual dimming support, RT/CLK synchronization capability, thermal shutdown at 165°C, UVLO hysteresis configuration, and HVSSOP-10 PowerPAD™ package thermal performance.

Technical Context

The TPS92512DGQR implements peak-current mode control with fixed-frequency operation, enabling precise line/load regulation and simplified compensation design. Its internal transconductance error amplifier (331 µA/V gain, 2.7 MHz bandwidth) interfaces with ISENSE and COMP pins to regulate LED current via adjustable 0–300 mV sense voltage.

It supports two dimming modes: analog adjustment via IADJ (0–1.8 V → ISENSE = VIADJ/6) and PWM dimming via PDIM (100 Hz–1 kHz, >100:1 contrast ratio). The RT/CLK pin operates in resistor-programmed mode (474–513 mV regulated voltage) or PLL-synchronized mode (300 kHz–2 MHz), with automatic fallback to 150 kHz on clock loss.

Key Specifications

Pinout & Package

HVSSOP-10 package with exposed PowerPAD™ thermal pad (5.00 mm × 3.00 mm); requires direct PCB copper connection to GND for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Compared with TPS92512DGQR, TPS92512DGQT offers identical performance in tape-and-reel form for factory automation, while LM3409HVMM/NOPB trades integration for higher input voltage range and external FET flexibility-neither is pin-compatible, but both serve adjacent high-reliability LED driver needs.

Availability

TPS92512DGQR is available at Aetrix Electronics and suitable for street lighting, emergency lighting, and retail illumination requiring stable component supply, long-term manufacturing continuity, and automotive-grade thermal robustness.

Supply support for TPS92512DGQR 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 company specializing in analog, embedded processing, and power management technologies with over 50 years of leadership in high-reliability power conversion.

The TPS92512 product line delivers highly integrated, thermally optimized LED drivers for industrial and outdoor lighting, designed to replace discrete buck controllers while maintaining design flexibility through analog+PWM dimming and frequency synchronization.

FAQ

What is the maximum input voltage rating for the TPS92512DGQR?

The TPS92512DGQR has an absolute maximum input voltage rating of 45 V on the VIN pin, with recommended operating range from 4.5 V to 42 V. Exceeding 45 V risks permanent damage. This distinguishes it from the TPS92512HV variant, which supports up to 65 V absolute maximum and 60 V operating input.

How does the IADJ pin control LED current in the TPS92512DGQR?

The IADJ pin sets the TPS92512DGQR's current sense reference voltage: V_ISENSE = V_IADJ/6. Applying 0–1.8 V to IADJ yields 0–300 mV at ISENSE, directly scaling the regulated LED current. For example, 1.2 V on IADJ produces 200 mV at ISENSE, resulting in I_LED = 200 mV / R_SENSE.

Can the TPS92512DGQR synchronize its switching frequency to an external clock?

Yes, the TPS92512DGQR supports external clock synchronization via the RT/CLK pin. When driven with a square wave (0.63–1.81 V thresholds, ≥51 ns pulse width), it enters PLL mode and locks to frequencies from 300 kHz to 2 MHz. The internal oscillator resumes if the clock signal stops, defaulting to 150 kHz.

What thermal management requirements apply to the TPS92512DGQR package?

TPS92512DGQR uses an HVSSOP-10 PowerPAD™ package requiring direct soldering of the exposed pad to a large PCB GND copper area. Thermal resistance is R_θJA = 66.7°C/W; proper pad layout and thermal vias are essential to maintain T_J ≤125°C under 2.5 A load at 42 V input.

Does the TPS92512DGQR support both analog and PWM dimming simultaneously?

Yes, the TPS92512DGQR supports concurrent analog and PWM dimming: IADJ sets the maximum current level (e.g., 1.5 A), while PDIM modulates average current within that ceiling (e.g., 10–100% duty cycle). This enables fine-grained brightness control with high contrast ratios exceeding 100:1.