Texas Instruments TPS92510DGQR

Overview

TPS92510DGQR from Texas Instruments is a 60-V, 1.5-A peak-current-mode buck LED driver IC with integrated 200-mΩ high-side MOSFET, ±3% LED current accuracy, and dedicated PDIM pin for linear PWM dimming. It delivers constant current to high-brightness LED strings in street lighting and MR16 bulbs.

For engineers reviewing the TPS92510DGQR datasheet, TPS92510DGQR pinout, TPS92510DGQR application, or TPS92510DGQR equivalent, key selection considerations include its 100 kHz–2.5 MHz adjustable switching frequency, integrated thermal foldback via TSENSE, and MSOP-10 PowerPAD™ package with exposed thermal pad.

Technical Context

The TPS92510DGQR implements fixed-frequency peak-current-mode control with internal slope compensation to prevent subharmonic oscillation across full duty-cycle range. Its transconductance error amplifier (310 µA/V) compares VSENSE against a 200-mV reference to regulate LED current.

It features dual-mode RT/CLK pin operation: resistor-to-ground sets switching frequency (100–2500 kHz), while external clock input (300–2200 kHz) engages PLL synchronization with 100-µs lock-in time. Thermal foldback uses an NTC thermistor on TSENSE to reduce average LED current as sensed temperature rises.

Key Specifications

Pinout & Package

TPS92510DGQR is housed in a 10-pin MSOP PowerPAD™ package with exposed thermal pad (Pad) electrically connected to GND for enhanced thermal performance. The PowerPAD must be soldered to a PCB copper pour for proper junction-to-board thermal resistance (θ_JB = 37.5°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3409HVMM/NOPB and LT3474EDD#PBF, the TPS92510DGQR provides superior integration (MOSFET + 200-mV reference + TSENSE foldback + PLL sync) for 3.5–60 V, 1.5-A LED drivers where size, thermal safety, and EMI control are critical.

Availability

TPS92510DGQR is available at Aetrix Electronics and suitable for street lighting, emergency lighting, and MR16 LED bulb designs requiring stable component supply, long-lifecycle support, and automotive-grade reliability validation.

Supply support for TPS92510DGQR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.

The TPS92510DGQR belongs to TI's high-voltage LED driver product line, engineered specifically for constant-current buck regulation in thermally demanding, wide-input industrial and architectural lighting applications.

FAQ

What is the maximum continuous LED current supported by the TPS92510DGQR?

The TPS92510DGQR is rated for 1.5-A peak inductor current and supports up to 1.5 A of continuous LED current under proper thermal design. Its integrated 200-mΩ high-side MOSFET and MSOP-10 PowerPAD™ package enable this rating when θ_JB ≤ 37.5°C/W is maintained. Derating applies above +125°C junction temperature per the datasheet's current-limit curve.

How does the TPS92510DGQR implement thermal foldback, and what components are required?

The TPS92510DGQR implements thermal foldback using the TSENSE pin, which sources 95 µA (typical) to bias an NTC thermistor connected between TSENSE and GND. As LED temperature rises, NTC resistance drops, lowering TSENSE voltage and reducing average LED current. A 0.01-µF bypass capacitor to GND is recommended for noise immunity. No external op-amp or ADC is required.

Can the TPS92510DGQR synchronize to an external clock, and what are the timing requirements?

Yes, the TPS92510DGQR synchronizes to an external clock via the RT/CLK pin. The input must swing below 0.7 V (low threshold) and above 2.2 V (high threshold), with minimum pulse width ≥40 ns. Synchronization range is 300–2200 kHz, and PLL lock-in time is 100 µs. The PH rising edge aligns to the RT/CLK falling edge, enabling deterministic multi-string timing.

What is the purpose of the BOOT pin, and what capacitor value is recommended?

BOOT supplies gate drive voltage to the internal high-side MOSFET. A 0.1-µF X7R/X5R ceramic capacitor (10-V rating min) must be placed between BOOT and PH. This capacitor recharges during the low-phase of PH (when freewheeling diode conducts). The TPS92510DGQR includes internal BOOT UVLO (2.1 V threshold) to disable the MOSFET if boot voltage sags, preventing shoot-through.

Does the TPS92510DGQR support 100% duty cycle operation, and under what conditions?

Yes, the TPS92510DGQR supports near-100% duty cycle operation as long as the BOOT-to-PH voltage remains above 2.1 V. This is enabled by its internal BOOT UVLO circuit and low gate-drive current demand. However, sustained zero-load conditions may prevent BOOT capacitor recharge; design must ensure sufficient inductor current during freewheeling to maintain BOOT voltage in high-duty-cycle applications.