STMicroelectronics LED1202QTR

Overview

LED1202QTR from STMicroelectronics is a 12-channel low-quiescent-current LED driver in QFN20 3×3 mm package, delivering 20 mA per channel with 350 mV typical headroom at 16 mA, 1% typical current matching, and dual 8-bit analog + 12-bit PWM dimming control. It enables synchronized breathing effects and fade-in/fade-out lighting in wearable electronics and battery-powered indicators.

For engineers reviewing the LED1202QTR datasheet, LED1202QTR pinout, LED1202QTR application, or LED1202QTR equivalent, key selection criteria include I²C address configurability (8 local + 1 global), open-LED detection threshold (100 mV), thermal shutdown (150 °C), phase-shift timing (≈380 µs), and pattern sequencing capability (8 programmable patterns, infinite-loop repetition).

Technical Context

The LED1202QTR integrates twelve independent low-side current sinks with per-channel analog dimming (8-bit, 1–20 mA) and local digital dimming (12-bit, 0–100% duty cycle), enabling 20-bit combined brightness resolution. Its internal oscillator generates a fixed 220 Hz PWM frequency, and phase-shifting across channels reduces inrush current by staggering turn-on timing.

It supports multi-device synchronization via shared clock domain-A0 outputs internal clock (configurable), A1 accepts external clock input-and uses an open-drain IRQn pin to signal open-LED, overtemperature, pattern-end, or start-of-frame events. The I²C interface operates up to 400 kHz with 1.8 V logic compatibility and eight selectable slave addresses via A0/A1 pins.

Key Specifications

Pinout & Package

LED1202QTR is packaged in a thermally enhanced QFN20 3×3 mm body (0.6 mm height, 0.5 mm pitch), suitable for space-constrained portable designs. Thermal resistance is θ_ja = 65.3 °C/W on standard JEDEC 2S2P PCB.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-channel LED driver applications.

Compared with TLC59284RTJR and IS31FL3731-QFLS4-TR, the LED1202QTR uniquely combines 5 V LED drive capability, autonomous pattern sequencing, inter-device clock synchronization, and open-LED/overtemperature fault reporting-all in a 3×3 mm QFN package optimized for portable power efficiency.

Availability

LED1202QTR is available at Aetrix Electronics and suitable for wearable electronics, battery-powered portable accessories, and compact RGB display backlighting requiring stable component supply, long-term lifecycle support, and verified thermal performance up to +85 °C ambient.

Supply support for LED1202QTR 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 microcontrollers, power management ICs, sensors, and analog chips for industrial, automotive, and consumer markets.

The LED1202 product line targets ultra-low-power, high-precision LED lighting in space- and energy-constrained portable devices-emphasizing autonomous operation, multi-device synchronization, and robust fault handling without MCU overhead.

FAQ

What is the minimum headroom voltage required for full 20 mA output on LED1202QTR?

The typical headroom voltage is 350 mV at 16 mA output, but it varies with current: at 20 mA, V_{CS_MIN} rises to ~400 mV due to dual-sink architecture switching. This ensures stable regulation while maintaining low power loss-critical for battery-powered designs where supply headroom is limited.

How does the LED1202QTR handle synchronization across multiple devices in a single lighting system?

It supports master-slave clock distribution: one device configures A0 as clock output (CLK_O_En), others set A1 as clock input (CLK_I_En). All devices then share the same PWM frame timing and pattern sequence alignment-eliminating visible phase drift between independently controlled LED zones.

Can the LED1202QTR operate without an external microcontroller after initial configuration?

Yes. Once programmed via I²C, it autonomously executes stored patterns-including fade-in/fade-out sequences-with no further MCU interaction. The internal oscillator, pattern sequencer, and phase-shift logic run independently, making it ideal for ultra-low-power always-on indicators.

What fault conditions trigger the IRQn pin, and how are they cleared?

IRQn asserts on open-LED detection (100 mV threshold), overtemperature (>150 °C), pattern-sequence completion, or start-of-frame. The pin resets automatically after reading the Fault and Status Interrupt register; open-LED flags require explicit read-back of Open LED status registers (07h/08h) to clear latched bits.