STMicroelectronics STP24DP05BTR

Overview

STP24DP05BTR from STMicroelectronics is a 24-bit constant-current LED sink driver IC for RGB panel displays, featuring 8×3 independently controllable sink channels, adjustable output current (5–80 mA per channel via external R_EXT resistors), short/open error detection, and 25 MHz serial data throughput. It operates from 3.0–5.5 V and supports gradual output turn-on delay to suppress inrush current in high-density LED signage.

For engineers reviewing the STP24DP05BTR datasheet, STP24DP05BTR pinout, STP24DP05BTR application, or STP24DP05BTR equivalent, key selection criteria include its 24-channel sink architecture with per-group current tuning, real-time open/short fault reporting via SDO, RGB/BGR data flow reconfiguration via DF0/DF1 pins, and thermal flag (TFLAG) monitoring up to 170 °C junction temperature.

Technical Context

The device integrates an 8×3-bit serial-in/parallel-out shift register cascaded with an 8×3-bit D-type storage latch, enabling precise timing control of 24 independent current sinks. Its output stage uses regulated current sources with ±3% inter-channel accuracy at ≥15 mA and supports up to 20 V LED string voltage.

Error detection is implemented as a three-phase process: entry via DM pin or SPI sequence, active sensing during OE assertion, and result serialization via SDO with bit-aligned fault flags ('0' = fault). Detection thresholds are fixed relative to programmed I_OUT: open line detected when I_ODEC ≤ 0.4×I_OUT; short-to-V_O when V_O ≥ 2.6 V.

Key Specifications

Pinout & Package

TQFP48-EP package with 3.8 mm × 3.8 mm exposed thermal pad (electrically isolated or grounded per layout guidelines).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 24-bit constant-current LED sink driver applications.

Compared with TLC5947 and IS31FL3731, STP24DP05BTR uniquely combines 24-channel sink architecture, 20 V compliance, hardware-accelerated fault detection, and configurable RGB data flow - making it optimal for large-area, high-reliability LED displays where fault visibility and thermal resilience are design priorities.

Availability

STP24DP05BTR is available at Aetrix Electronics and suitable for indoor LED signage, automotive ambient lighting, industrial HMIs, and stage lighting controllers requiring stable component supply and long-term production continuity.

Supply support for STP24DP05BTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The STP24DP05 belongs to ST's LED controller product line, engineered specifically for high-channel-count, fault-aware LED panel systems where reliability, thermal robustness, and simplified system-level diagnostics are critical.

FAQ

What is the minimum recommended external R_EXT value for 80 mA output current?

The datasheet specifies R_EXT = 249 Ω for 80 mA at V_DD = 5.0 V (Table 15). Using lower resistance risks exceeding absolute maximum output current (80 mA) and may degrade current accuracy due to increased thermal drift. ST recommends derating to 270 Ω for production designs to ensure margin across temperature and process variation.

Can STP24DP05BTR drive common-anode LED configurations?

No - STP24DP05BTR is a sink-only driver with 24 N-channel current sinks. It requires common-anode LED arrays where the anodes are tied to a positive supply (up to 20 V), and cathodes connect to the R/G/B output pins. Driving common-cathode arrays would require external high-side switches or a different driver topology.

How does the DG pin affect timing in normal operation versus detection mode?

In normal operation, DG = LOW applies 30 ns stagger per 8-channel group to reduce inrush; DG = HIGH disables delay for simultaneous turn-on. During detection mode, DG has no effect - all 24 outputs activate concurrently when OE pins are asserted, ensuring uniform fault sampling across the entire array.

Is the thermal pad (exposed die paddle) required to be connected to ground?

The exposed pad must be electrically connected to a PCB copper pour for thermal dissipation, but ST does not mandate grounding. It may be left floating or tied to GND depending on system noise requirements; however, soldering it to a thermal plane is mandatory to achieve the specified R_thJA = 33 °C/W and prevent thermal throttling above 85 °C ambient.