Texas Instruments LP5812AYBHR

Overview

LP5812AYBHR from Texas Instruments is a 4 × 3 matrix RGB LED driver IC with autonomous animation engine, time-cross-multiplexing (TCM) topology, and integrated 4-channel constant current sinks (0.1–51 mA per channel). It supports I²C up to 1 MHz, operates from 2.7 V to 5.5 V, and delivers ultra-low active current (0.4 mA typ. at 25.5 mA LED load), enabling compact wearable LED indication systems.

For engineers reviewing the LP5812AYBHR datasheet, LP5812AYBHR pinout, LP5812AYBHR application, or LP5812AYBHR equivalent, key selection criteria include TCM-driven 12-LED matrix capability, autonomous PWM animation control without MCU intervention, ultra-low headroom voltage (110 mV typ. at 25.5 mA), and DSBGA-9 package compatibility for space-constrained PCB layouts.

Technical Context

The LP5812AYBHR implements a time-cross-multiplexing architecture combining four high-side PMOS scan switches and four low-side constant current sinks in a single-output-pin structure-each OUTx pin serves dual roles (scan switch + current sink). This enables 4×3 matrix control using only four pins while supporting configurable multiplexing ratios (¼, ⅓, ½, 1) and drive modes (direct, TCM, mix).

Its autonomous animation engine executes preloaded lighting sequences using internal 8-bit dot current and PWM registers per LED, synchronized across multiple devices via a programmable 6 MHz internal oscillator and SYNC pin. Integrated de-ghosting uses voltage clamping at Vmid during blank periods to eliminate both up- and down-side ghosting without reverse LED stress.

Key Specifications

Pinout & Package

LP5812AYBHR is packaged in a 9-pin DSBGA (1.43 mm × 1.34 mm, 0.4 mm pitch) with bottom thermal pad. Pin assignment follows YBH variant layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP5812BYBHR, LP5812AYBHR provides the base I²C address for single-device integration; compared with LP5813AYBHR, it delivers superior efficiency and compactness for mid-Vf RGB LEDs but lacks boost capability for marginal supply conditions.

Availability

LP5812AYBHR is available at Aetrix Electronics and suitable for smart wearable electronics, gaming peripherals, and IoT status indication requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LP5812AYBHR 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision power management and interface solutions.

The LP5812AYBHR belongs to TI's LP58xx family of autonomous LED drivers, designed specifically for low-power, space-constrained RGB indication in consumer and industrial human-machine interfaces.

FAQ

What is the primary function of the LP5812AYBHR in an LED system?

The LP5812AYBHR is a dedicated 4×3 matrix RGB LED driver IC that autonomously controls up to 12 LEDs using time-cross-multiplexing (TCM) topology. It integrates constant current sinks, PWM generators, and an animation engine to manage brightness, color sequencing, and fault detection without continuous MCU involvement - making it ideal for battery-powered UIs where processing resources and power are constrained. The LP5812AYBHR handles all low-level LED timing and current regulation internally.

Does the LP5812AYBHR require external current-setting resistors?

No, the LP5812AYBHR does not require external current-setting resistors. Its 4 constant current sinks are digitally programmable via 1-bit global Maximum Current (MC) and 8-bit per-channel Dot Current (DC) registers. The MC bit selects between 25.5 mA or 51 mA full-scale range, and DC provides 256-step fine adjustment - enabling precise, resistorless current control across temperature and unit variance. This simplifies BOM and improves production yield versus analog-set drivers.

How does the LP5812AYBHR achieve ghost-free multiplexed LED operation?

The LP5812AYBHR integrates hardware de-ghosting by clamping OUTx pins to a programmable mid-rail voltage (Vmid) during PWM off and blank periods. This pre-charges current sinks and pre-discharges scan FETs simultaneously, eliminating both up-side and down-side ghosting without reverse LED voltage stress. The Vmid level is selectable via Dev_Config12 register to match LED forward voltage ranges - a feature implemented entirely within the LP5812AYBHR without external diodes or capacitors.

Can the LP5812AYBHR synchronize lighting effects across multiple boards?

Yes, the LP5812AYBHR supports multi-device synchronization via its dedicated SYNC pin. When configured as output, it generates a precise 6 MHz clock derived from its internal oscillator; when configured as input, it accepts an external clock to align frame timing across multiple LP5812AYBHR units. This ensures phase-coherent animations (e.g., ripple, chase) across separate PCBs - critical for cohesive lighting in modular products like speaker arrays or multi-segment wearables.

What package type and thermal characteristics apply to the LP5812AYBHR?

The LP5812AYBHR is supplied in a 9-pin DSBGA package (1.43 mm × 1.34 mm, 0.4 mm pitch) with an exposed thermal pad. Its junction-to-board thermal resistance (RθJB) is 33.9 °C/W, and junction-to-ambient (RθJA) is 113.1 °C/W - optimized for thin PCBs with direct thermal vias to inner ground planes. This package enables placement directly behind small OLED or mechanical buttons in ultra-thin wearables, where WSON alternatives would exceed height constraints.