STMicroelectronics STP16CPPS05TTR

Overview

STP16CPPS05TTR 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. The device operates from 3.0–5.5 V, supports 30 MHz clock input, and features auto power-saving mode for low-quiescent-current standby in signage and industrial HMI applications.

For engineers reviewing the STP16CPPS05TTR datasheet, STP16CPPS05TTR pinout, STP16CPPS05TTR application, or STP16CPPS05TTR equivalent, key selection criteria include output current adjustability via R-EXT, thermal performance of the TSSOP-24 exposed pad package, OE-controlled PWM dimming capability, and cascade-compatible serial-in/parallel-out architecture for multi-device LED arrays.

Technical Context

The STP16CPPS05TTR implements a two-stage digital control path: a 16-bit serial-in, parallel-out shift register feeds a 16-bit D-type storage latch, enabling synchronous data loading and output update. Output enable (OE) is level-sensitive and independent of clock edges, allowing precise timing of LED on/off transitions without synchronization constraints.

Each of the 16 output channels uses a matched current sink with programmable compliance up to 20 V and dropout voltage as low as 36 mV at 3 mA. The auto power-saving circuit monitors latch state and reduces supply current from ~7.5 mA to 190 μA when all outputs are inactive, reactivating within microseconds upon new data latching.

Key Specifications

Pinout & Package

The STP16CPPS05TTR is housed in a thermally enhanced 24-pin TSSOP package with an exposed pad (JEDEC MO-153 variant), requiring soldering of the pad to a PCB copper pour for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB62786FNG and IS31FL3728-QFLS4-TR, the STP16CPPS05TTR uniquely balances high-speed serial interface, autonomous power management, and thermal robustness in a single-exposed-pad TSSOP-making it optimal for cost-sensitive, space-constrained, and thermally demanding LED signage designs.

Availability

STP16CPPS05TTR is available at Aetrix Electronics and suitable for indoor LED signage, industrial HMI panels, architectural lighting controls, and test equipment status displays requiring stable component supply and long-term production continuity.

Supply support for STP16CPPS05TTR 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The STP16CPPS05TTR belongs to ST's LED driver portfolio targeting energy-efficient, high-reliability display subsystems-specifically engineered to simplify LED array control while minimizing thermal and power design complexity in space-constrained applications.

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 V_DD = 3.3–5 V and T_A = 25 °C. Using a lower resistance risks exceeding absolute maximum output current (50 mA) and may degrade current accuracy or thermal margin. For production use, 497 Ω ±1% metal-film resistor is recommended to maintain ±3% inter-channel matching at full scale.

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

Auto power-saving activates only when all 16 outputs are OFF (OE = high or latched data = all zeros) and no new data has been shifted in for >100 ms. It is fully transparent to OE and LE: pulling OE low immediately restores full output capability, and LE transitions continue to load new data regardless of power state. No software intervention or external control is needed.

Can STP16CPPS05TTR drive common-anode LED configurations?

No-the STP16CPPS05TTR is a sink-only driver with N-channel output stages tied to GND. It requires LEDs connected anode-to-V_DD, cathode-to-OUTn. To drive common-anode arrays, a high-side switch (e.g., PMOS or PNP) must be added per string, increasing complexity and reducing efficiency. For common-anode designs, consider source-driver alternatives like STP16DP05BPTR.

What PCB layout practices maximize thermal performance of the exposed pad?

For optimal thermal conduction, the exposed pad must be soldered to a minimum 100 mm² copper pour connected to internal ground planes via ≥4 thermal vias (0.3 mm diameter, filled or capped). Avoid solder mask over the pad area. The datasheet confirms R_thJA drops from 55 °C/W (standard TSSOP) to 37.5 °C/W only when the pad is properly thermally anchored to PCB copper.