STMicroelectronics STP16CPPS05PTR

Overview

STP16CPPS05PTR from STMicroelectronics is a 16-channel constant-current LED sink driver IC designed for serially controlled LED panel displays. It integrates a 16-bit shift register, latch, and sixteen regulated current sources delivering 3–40 mA per channel with ±1% inter-channel accuracy at 5 mA, driven by a 30 MHz clock, and operating from 3.0–5.5 V supply-enabling high-density, uniform-brightness signage and industrial HMI displays.

For engineers reviewing the STP16CPPS05PTR datasheet, STP16CPPS05PTR pinout, STP16CPPS05PTR application, or STP16CPPS05PTR equivalent, key selection criteria include output current adjustability via R-EXT, auto power-saving shutdown (190–240 µA), 20 V output swing capability, TSSOP24 exposed pad thermal performance (R_thJA = 37.5 °C/W), and 3.3 V MCU compatibility without level-shifting.

Technical Context

The device implements a cascaded architecture: serial data (SDI) shifts through a 16-bit shift register synchronized to CLK, then latched in parallel to control 16 independent current-sink outputs (OUT0–OUT15). Output enable (OE, active-low) provides global PWM dimming, while latch enable (LE) controls data transfer timing independently of CLK edges.

Current regulation is achieved via an external resistor (R-EXT) connected to pin 23, setting I_OUT from 3 to 40 mA with <±1% matching between channels at 5 mA. The auto power-saving feature detects idle latch states and reduces supply current from ~7.5 mA to 190–240 µA without external intervention, reactivating on first valid latch event.

Key Specifications

Pinout & Package

STP16CPPS05PTR is supplied in QSOP-24 package (3.91 mm × 8.66 mm × 1.62 mm), featuring gull-wing leads and optimized thermal performance for space-constrained LED driver applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC59283DR and MAX7219CWG+, STP16CPPS05PTR offers superior thermal efficiency in QSOP-24, deterministic auto power-saving for battery-sensitive designs, and tighter current matching-making it optimal for high-reliability, space-constrained LED signage and industrial HMIs.

Availability

STP16CPPS05PTR is available at Aetrix Electronics and suitable for LED signage panels, industrial HMI displays, automotive interior lighting, and test & measurement equipment requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for STP16CPPS05PTR 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, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.

STP16CPPS05PTR belongs to ST's LED driver portfolio targeting high-accuracy, low-voltage constant-current applications in signage, instrumentation, and human-machine interfaces-emphasizing thermal efficiency, MCU compatibility, and system-level power optimization.

FAQ

What is the minimum R-EXT value that ensures stable 40 mA output per channel?

The datasheet specifies R-EXT = 497 Ω for 40 mA output at 25 °C with VDD = 3.3 V or 5.0 V. Using a lower resistance risks exceeding the 50 mA absolute maximum rating per output and may degrade current accuracy due to increased thermal drift. ST recommends staying within the 331–497 Ω range for 60–40 mA operation, with 497 Ω as the validated nominal value for 40 mA.

How does the auto power-saving feature interact with OE and LE signals during startup?

At power-up, STP16CPPS05PTR enters shutdown mode (IDD ≈ 190–240 µA) regardless of OE/LE state. It remains in shutdown until the first valid LE high pulse latches new data-then transitions to normal operation. OE remains functional during this transition: pulling OE high after startup forces all outputs OFF while retaining latch data and enabling immediate restart upon OE low.

Can STP16CPPS05PTR drive LEDs with forward voltages exceeding 15 V per string?

Yes-the device guarantees 20 V output compliance (VO ≤ 20 V), allowing direct drive of LED strings totaling up to ~18 V at 25 °C (e.g., six 3.0 V white LEDs). At elevated temperatures or higher currents, derating applies: at 40 mA and 125 °C ambient, the usable headroom drops to ~16 V due to increased dropout voltage (724 mV at 40 mA).

Is the exposed pad in the TSSOP24 variant electrically connected internally?

No-the exposed pad in the TSSOP24 exposed pad variant (e.g., STP16CPPS05XTTR) is not internally connected to any die node. It must be soldered to a PCB copper pour tied to GND or left floating per layout guidelines; electrical isolation from internal circuitry is intentional to maximize thermal conduction without introducing noise coupling paths.