Texas Instruments TPS61194PWPR

Overview

TPS61194PWPR from Texas Instruments is a high-efficiency, four-channel LED driver IC with integrated boost/SEPIC DC-DC converter, precision current sinks (±5% accuracy, 1% typical matching), 100 mA per channel, and adaptive output voltage control. It operates from 4.5 V to 40 V input and delivers up to 45 V output for industrial backlighting in control panels and test equipment.

For engineers reviewing the TPS61194PWPR datasheet, TPS61194PWPR pinout, TPS61194PWPR application, or TPS61194PWPR equivalent, key selection criteria include its 10,000:1 PWM dimming ratio at 100 Hz, spread-spectrum EMI reduction, external SYNC capability, and fault detection for open/shorted LEDs and thermal shutdown.

Technical Context

The TPS61194PWPR integrates a current-mode boost/SEPIC controller with adaptive output voltage regulation-dynamically adjusting VOUT based on real-time headroom monitoring of all active LED current sinks. Its switching frequency is resistor-programmable (300 kHz–2.2 MHz) or externally synchronized, with optional ±3% spread spectrum for EMI suppression.

It features an internal 4.3-V LDO for digital I/O supply, four independent current sinks with programmable 100 mA max per channel via RISET, and comprehensive protection including VIN OVP/UVLO, open/short LED detection, and thermal shutdown at 165°C with 20°C hysteresis.

Key Specifications

Pinout & Package

TPS61194PWPR is housed in a thermally enhanced HTSSOP-20 package (6.50 mm × 4.40 mm) with exposed thermal pad for efficient heat dissipation in high-current LED driver applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61194PWPR, TPS61193PWPR offers identical performance in a reduced-channel form factor ideal for cost-sensitive 3-string designs, while LM3409QMHX/NOPB provides higher single-string current capability at the expense of integration, multi-channel coordination, and ease of use.

Availability

TPS61194PWPR is available at Aetrix Electronics and suitable for industrial backlighting systems in control panels, test and measurement equipment, and industrial PCs requiring stable component supply, long-lifecycle support, and automotive-grade reliability.

Supply support for TPS61194PWPR 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 high-reliability industrial and automotive solutions.

The TPS61194 belongs to TI's high-performance LED driver product line, designed specifically for robust, multi-zone backlighting in harsh industrial environments where precision current matching, wide input range, and comprehensive fault protection are mandatory.

FAQ

What is the maximum LED string voltage supported by the TPS61194PWPR?

The TPS61194PWPR supports up to 45 V on its DC-DC output, enabling it to drive LED strings with combined forward voltages up to approximately 40 V. This is set via an external resistor divider on the FB pin, and the device dynamically adjusts output voltage to the minimum required headroom - ensuring optimal efficiency across varying LED configurations and temperatures. The TPS61194PWPR maintains this capability across its full operating temperature range (−40°C to +125°C).

How does the TPS61194PWPR achieve 10,000:1 PWM dimming ratio?

The TPS61194PWPR achieves 10,000:1 dimming at 100 Hz by precisely replicating the input PWM signal at its LED outputs with sub-microsecond timing fidelity (minimum on/off time of 0.5 µs). Its internal logic ensures zero latency between PWM input and current sink enable/disable, eliminating duty-cycle distortion. This specification is validated across the full operating temperature and input voltage range, making it suitable for high-contrast industrial displays requiring deep black levels and smooth grayscale transitions.

Can unused current sink outputs on the TPS61194PWPR be left floating?

No - unused current sink outputs (OUT1–OUT4) on the TPS61194PWPR must be connected to GND to disable them and exclude them from the adaptive voltage control loop and fault detection circuitry. Leaving them floating may cause unpredictable behavior, inaccurate headroom sensing, or false fault triggers. Grounding unused outputs also minimizes leakage current (≤5 µA per output) and ensures stable operation of the remaining active channels.

Does the TPS61194PWPR require external components for basic operation?

Yes - the TPS61194PWPR requires external components for core functionality: an inductor and diode for the boost/SEPIC converter, input/output capacitors (CIN/COUT), two resistors for current setting (RISET) and frequency setting (RFSET), and a feedback divider (R1/R2) for VOUT regulation. However, it integrates the power FET, LDO, current sinks, and protection logic - reducing total BOM count by ~30% compared to discrete-driver solutions. The HTSSOP-20 package includes an exposed thermal pad that must be soldered to a PCB copper pour for thermal management.

What fault conditions does the TPS61194PWPR detect and how is the FAULT pin used?

The TPS61194PWPR detects open-circuit and short-circuit conditions on any LED string, input overvoltage (OVP at 42 V typical), input undervoltage (UVLO at 4 V), and die overtemperature (thermal shutdown at 165°C). The open-drain FAULT pin asserts low during any fault condition and remains latched until the fault clears and the device resets - either via EN toggle or power cycle. No external pull-up is strictly required, but a 10-kΩ resistor to VDDIO/EN is recommended for reliable logic-level interfacing with microcontrollers or FPGA GPIOs.