Texas Instruments TLC5904PZP

Overview

TLC5904PZP from Texas Instruments is a 16-channel constant-current LED driver IC with integrated 256-step PWM grayscale control, 8/16-bit output mode selection via MODE pin, ±4% current accuracy across channels, and built-in OVM, WDT, and TSD protection-designed for high-reliability outdoor LED signage and large-area displays.

For engineers reviewing the TLC5904PZP datasheet, TLC5904PZP pinout, TLC5904PZP application, or TLC5904PZP equivalent, this page delivers verified electrical specs, thermal shutdown behavior, output voltage monitoring logic, and cascade-compatible 15 MHz data transfer timing critical for panel-level system integration and fault-tolerant display design.

Technical Context

The TLC5904PZP integrates three independent shift registers (grayscale, brightness control, OVM), dual latches (XLATCH-controlled), and a 16-bit constant-current sink array with per-channel 5–80 mA or 10–120 mA programmable range selected by external IREF resistor and MODE pin state. Its gray scale counter operates synchronously to GSCLK up to 8 MHz, enabling precise 256-level intensity control per channel.

OVM monitors OUTn voltage during active drive to detect LED open-circuit (LOD) or short-circuit faults, asserting XDOWN2 low; WDT triggers output disable if WDTRG scan pulses stall beyond capacitor-set timeout; TSD disables outputs when junction temperature exceeds 150–170°C. All inputs feature Schmitt-triggered logic except IREF and WDCAP.

Key Specifications

Pinout & Package

100-pin HTQFP package (PZP) with exposed thermal pad; 16 constant-current output terminals (OUT0–OUT15), dual power domains (VCCLOG/GNDLOG, VCCANA/GNDANA, VCCLED/GNDLED), and dedicated fault-monitoring outputs (XDOWN1, XDOWN2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC5904PZP, TLC59283PZPR offers greater channel density but sacrifices integrated safety features, while MAX7219CWG+ provides simpler SPI control yet lacks per-channel current tuning and fault monitoring essential for outdoor reliability.

Availability

TLC5904PZP is available at Aetrix Electronics and suitable for outdoor LED video walls, transportation signage, architectural lighting panels, and industrial control displays requiring stable component supply across multi-year production cycles.

Supply support for TLC5904PZP 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 over 50 years of innovation in industrial and automotive-grade ICs.

The TLC5904PZP belongs to TI's high-reliability LED driver product line, engineered specifically for outdoor and mission-critical display systems demanding integrated fault protection, thermal resilience, and precise grayscale fidelity.

FAQ

What is the maximum safe output voltage for TLC5904PZP?

The TLC5904PZP supports a maximum output voltage of 17 V on its OUTn terminals, enabling direct drive of LED strings with up to five standard 3.2 V white LEDs in series. This rating is specified under recommended operating conditions and must not exceed the absolute maximum of 18 V to avoid permanent damage. The device maintains constant current regulation across this voltage range as long as the minimum compliance voltage (0.4 V at 5–40 mA, 0.7 V at 40–80 mA) is met.

How does the MODE pin affect TLC5904PZP operation?

The MODE pin on the TLC5904PZP selects between two output configurations: high logic level enables 16-channel mode with 5–80 mA per output; low logic level enables 8-channel mode with 10–120 mA per output. This setting reconfigures the internal grayscale shift register mapping and determines how DIN data is distributed across the output array. The MODE state must be stable before XLATCH assertion to ensure correct data latching.

Can TLC5904PZP drive both red and blue LEDs in the same design?

Yes, the TLC5904PZP can drive red, green, and blue LEDs within the same system because its constant-current outputs operate independently of LED forward voltage - provided the total OUTn voltage (VCCLED – VF_LED) remains within the 0.4–17 V compliance range. For mixed-color panels, separate IREF resistors or brightness control register settings may be used to compensate for differing luminous efficacy and forward voltage characteristics across LED types.

What happens to TLC5904PZP outputs during thermal shutdown?

When the TLC5904PZP junction temperature exceeds the TSD threshold (150–170°C), all 16 constant-current outputs are immediately disabled and held in high-impedance state until temperature falls below hysteresis level. The XDOWN1 pin goes low to signal shutdown event, and outputs remain inactive even if BLANK or GSCLK signals continue - preventing thermal runaway. Normal operation resumes automatically once die temperature cools sufficiently.

How is LED open-circuit detection implemented in TLC5904PZP?

The TLC5904PZP implements LED open-circuit detection (LOD) via its Output Voltage Monitor (OVM) circuitry: when an OUTn channel is active, the internal comparator monitors voltage at that pin against a threshold set by the OVM latch. If the measured voltage drops below the threshold (indicating no current path - i.e., open LED), XDOWN2 asserts low. This open-collector output can be wired to a microcontroller interrupt or status LED, enabling real-time panel health monitoring without additional external components.