STMicroelectronics STP16CPS05XTTR

Overview

STP16CPS05XTTR from STMicroelectronics is a 16-bit constant-current LED sink driver in TSSOP24 exposed pad package, designed for serially controlled LED panel displays. It delivers adjustable output current (5–100 mA per channel), supports 30 MHz clock input, operates from 3.0–5.5 V supply, and features auto power-saving to reduce quiescent current when no active latch data is present.

For engineers reviewing the STP16CPS05XTTR datasheet, STP16CPS05XTTR pinout, STP16CPS05XTTR application, or STP16CPS05XTTR equivalent, key selection criteria include output current accuracy (±1.5% between bits), thermal resistance (37.5 °C/W with exposed pad soldered), 20 V output driving capability, and compatibility with 3.3 V microcontrollers via TTL/CMOS-level inputs.

Technical Context

The device integrates a 16-bit serial-in/parallel-out shift register cascaded with a 16-bit D-type storage latch, enabling synchronous LED pattern updates. Output stage uses sixteen matched current-regulated sinks, each programmable via a single external R_EXT resistor - allowing uniform brightness control across all channels without per-channel components.

Auto power management detects absence of new latch events and transitions to shutdown mode (I_DD(SH) = 120–200 μA), then automatically resumes normal operation on first valid LE assertion. Propagation delays are tightly specified: t_PLH1 = 17.5–55 ns and t_PHL1 = 8.5–19 ns (V_DD = 3.3–5 V), supporting high-speed multiplexed LED scanning.

Key Specifications

Pinout & Package

TSSOP24 exposed pad package (8.4 mm × 4.4 mm × 1.05 mm height) with thermally enhanced bottom pad requiring solder connection to PCB ground or dedicated thermal plane for optimal R_thJA = 37.5 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit constant-current LED sink driver applications.

Compared with TLC59283RTJR and MAX7219CWG+, the STP16CPS05XTTR uniquely combines auto power-saving, 16-channel flexibility, TSSOP24 exposed pad thermal performance, and 3.3 V logic compatibility - making it optimal for scalable, low-power, custom LED array designs.

Availability

STP16CPS05XTTR is available at Aetrix Electronics and suitable for indoor LED video walls, automotive interior lighting, and industrial status displays requiring stable component supply, thermal reliability, and serial scalability.

Supply support for STP16CPS05XTTR 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, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.

The STP16CPS05 belongs to ST's LED driver product line, engineered specifically for energy-efficient, high-accuracy constant-current LED control in space-constrained and thermally demanding display applications.

FAQ

What is the minimum recommended R_EXT value and corresponding output current?

The minimum R_EXT is 190 Ω, yielding 96–104 mA per channel (typ. 100 mA) at V_DD = 3.3–5 V and T = 25 °C. Lower values risk exceeding absolute maximum output current (100 mA) and thermal limits - especially without full exposed pad soldering. Always verify junction temperature using R_thJA = 37.5 °C/W and actual power dissipation.

Can STP16CPS05XTTR drive LEDs with forward voltages exceeding 5 V per segment?

Yes - the device guarantees 20 V output voltage capability per channel, enabling series connection of up to six standard red LEDs (~2.0 V VF each) or four blue/white LEDs (~3.2 V VF each). Ensure total string VF remains ≤20 V and that V_DD exceeds the highest required dropout voltage (typically ≥0.5 V above string VF).

How does the auto power-saving feature detect "no active data"?

The internal state machine monitors latch activity: if no rising edge on LE occurs for >100 ms (typ.), the device enters shutdown mode, reducing I_DD to ~170 μA. On the next LE high pulse, it wakes within 100 ns and resumes normal output behavior - no reset or reinitialization required.

Is the exposed pad electrically isolated or must it be grounded?

The exposed pad is internally connected to GND and must be soldered to a PCB copper area tied to system ground. This provides both electrical reference stability and primary thermal conduction path. Leaving it floating degrades R_thJA from 37.5 to >55 °C/W and risks latch-up under transient conditions.