STMicroelectronics STAP16DPPS05XTTR

Overview

STAP16DPPS05XTTR from STMicroelectronics is an AEC-Q100 qualified 16-bit constant-current LED sink driver for automotive backlighting and lighting systems. It delivers 3–40 mA per channel across 16 outputs, supports 3–5.5 V supply, features integrated short/open LED detection, auto power-saving, and operates up to 30 MHz clock frequency - enabling high-speed cascaded control in dashboard and DTRL applications.

For engineers reviewing the STAP16DPPS05XTTR datasheet, STAP16DPPS05XTTR pinout, STAP16DPPS05XTTR application, or STAP16DPPS05XTTR equivalent, key selection criteria include output current accuracy (±1% channel-to-channel), thermal shutdown at 170 °C, TSSOP24 exposed-pad package for enhanced thermal dissipation, and dual-mode operation via OE/DM2 and LE/DM1 pins for error detection and brightness control.

Technical Context

The device integrates a 16-bit serial-in/parallel-out shift register feeding a 16-bit D-type storage register, driving sixteen regulated current sinks with programmable output current via R-EXT (3–40 mA). Its error detection logic monitors each output for open-circuit, short-to-GND, and short-to-VO conditions without additional pins by repurposing OE/DM2 and LE/DM1 through a defined 5-cycle clock sequence.

Auto power-saving activates when no new latch data is detected, reducing supply current from ~7.5 mA (ON) to 200–300 µA (OFF); recovery occurs automatically on first valid latch event. The 20 V output voltage rating enables driving up to 6–7 white LEDs in series at 3.3 V supply, while 3.3 V logic compatibility ensures direct interfacing with automotive microcontrollers.

Key Specifications

Pinout & Package

TSSOP24 exposed pad package (JEDEC MO-153 variant) with thermal pad electrically isolated or connected to GND; soldering the exposed pad reduces R_thj-amb from 94 °C/W to 37.5 °C/W - critical for sustained 40 mA/channel operation in automotive ambient temperatures up to +105 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC59283RTJR and MAX7219CWG+T, the STAP16DPPS05XTTR uniquely combines AEC-Q100 qualification, 20 V output headroom, integrated diagnostics, and auto power-saving - making it the only drop-in solution for new automotive LED lighting designs requiring functional safety-aware fault reporting and thermal resilience.

Availability

STAP16DPPS05XTTR is available at Aetrix Electronics and suitable for automotive dashboard backlighting, exterior DTRL modules, and interior ambient lighting systems requiring stable component supply across extended vehicle lifecycles and temperature ranges.

Supply support for STAP16DPPS05XTTR 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 automotive-grade ICs, power devices, and microcontrollers since 1987.

The STAP16DPPS05 belongs to ST's Automotive LED Driver product line, engineered specifically for functional-safety-conscious lighting control in harsh automotive environments - emphasizing reliability, integrated diagnostics, and thermal robustness over generic LED driving capability.

FAQ

What is the minimum R-EXT value to achieve 40 mA output current at VDD = 3.3 V?

Per Table 11 in the datasheet, a 497 Ω resistor sets the output current to 40 mA at 25 °C and VDD = 3.3 V. This value assumes nominal process variation; design margin requires verifying actual current at worst-case temperature (-40 °C to +125 °C) and voltage (3.0–3.6 V), where current may vary ±5% due to R-EXT tolerance and internal reference drift.

How does the error detection mode interact with normal LED driving operation?

Error detection operates in a dedicated 5-clock-cycle sequence using OE/DM2 and LE/DM1 pins - it suspends normal output driving during detection (<1 µs per channel) and shifts fault status bits out via SDO. No display interruption occurs because detection is triggered between frames, and the device resumes normal operation immediately after the sequence completes.

Can STAP16DPPS05XTTR drive LEDs directly from a 12 V automotive battery rail?

No - the device requires a regulated 3.0–5.5 V supply (VDD). Its 20 V output voltage rating applies only to the collector-emitter voltage across each internal current sink (VO), allowing it to drive LED strings whose total forward voltage is up to 20 V - but VDD itself must remain within specification, typically supplied by a local DC-DC converter or LDO.

Is the exposed thermal pad on the TSSOP24 package required to be connected to GND?

No - the exposed pad is electrically isolated from internal circuitry and may be left floating, connected to GND, or tied to a dedicated thermal plane. However, soldering it to a large copper area significantly improves thermal performance (R_thj-amb drops from 94 to 37.5 °C/W), which is essential for sustained 40 mA/channel operation at high ambient temperatures.