Texas Instruments LP5523TM/NOPB

Overview

LP5523TM/NOPB from Texas Instruments is a nine-channel high-side RGB- and white-LED driver with integrated 1×/1.5× adaptive charge pump, 8-bit current control (25.5 mA full-scale), 12-bit PWM resolution, and on-chip program memory for autonomous lighting effects in mobile devices.

For engineers reviewing the LP5523TM/NOPB datasheet, LP5523TM/NOPB pinout, LP5523TM/NOPB application, or LP5523TM/NOPB equivalent, key selection criteria include charge-pump efficiency up to 94%, 200-nA standby current, I²C-compatible interface with four selectable addresses, built-in LED open/short detection, and temperature-compensated PWM luminance control.

Technical Context

The LP5523TM/NOPB implements three independent programmable execution engines supporting concurrent LED banks-each configurable for keypad illumination, fun lights, or indicator functions-with 96 total instructions stored in internal SRAM. Its adaptive charge pump autonomously selects 1× or 1.5× gain based on forward voltage of D1–D6 outputs, while D7–D9 are directly powered from VDD to bypass the pump for red LED elements.

It integrates a temperature-sensing element enabling linear PWM duty-cycle adjustment across −40°C to +90°C using one of 31 user-selectable slopes; the GPO pin provides digital control signaling, and the INT pin delivers end-of-sequence interrupts to host MCUs. The device supports external 32.7-kHz clock input or internal oscillator operation.

Key Specifications

Pinout & Package

LP5523TM/NOPB uses a 25-pin DSBGA package (2.26 mm × 2.26 mm, 0.4-mm pitch) with exposed thermal pad. All nine LED outputs (D1–D9) are high-side current sources; D7–D9 are internally connected to VDD, while D1–D6 are supplied via the charge pump output (VOUT).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP5523TM/NOPB, LP55231TM/NOPB offers identical functionality with upgraded protection features, while LP5562RTER provides greater channel count and integration at the cost of package and layout incompatibility - making LP5523TM/NOPB the most balanced choice for established nine-channel RGB/WLED systems.

Availability

LP5523TM/NOPB is available at Aetrix Electronics and suitable for mobile keypad illumination, RGB status indicators, WLED backlighting, and haptic-visual feedback systems requiring stable component supply and long-term production continuity.

Supply support for LP5523TM/NOPB 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability IC design.

The LP5523TM/NOPB belongs to TI's Lighting Management Unit (LMU) product line, engineered specifically for autonomous, low-power LED lighting effects in space-constrained portable electronics - emphasizing efficiency, integration, and firmware-offload capability.

FAQ

What is the primary function of the LP5523TM/NOPB in a mobile system?

The LP5523TM/NOPB serves as a fully integrated nine-channel LED driver that autonomously executes lighting patterns using internal program memory, eliminating continuous MCU involvement. It combines adaptive charge-pump power conversion, high-side current sources, temperature-compensated PWM, and I²C control - all in a 2.26 mm × 2.26 mm DSBGA package. This makes LP5523TM/NOPB ideal for battery-powered devices needing efficient, programmable visual feedback without sacrificing processing resources.

How does the LP5523TM/NOPB manage power efficiency across varying input voltages?

The LP5523TM/NOPB maintains high efficiency by dynamically selecting between 1× and 1.5× charge-pump gain based on the forward voltage requirements of LEDs connected to D1–D6. When input voltage is sufficient (e.g., ≥3.6 V), it operates in 1× mode; below that threshold, it switches to 1.5× mode to sustain LED bias. Meanwhile, D7–D9 are powered directly from VDD - bypassing the pump entirely for red LEDs - achieving up to 94% charge-pump efficiency and 93% overall LED drive efficiency. This architecture ensures LP5523TM/NOPB delivers consistent performance across the full 2.7–5.5 V Li-ion battery range.

Can the LP5523TM/NOPB operate without an external microcontroller after initial setup?

Yes - the LP5523TM/NOPB contains 96-word SRAM-based program memory and three independent execution engines, allowing it to run preloaded lighting sequences autonomously. Once configured via I²C (including pattern definitions, timing, and current settings), the device can execute animations, fades, blinks, or breathing effects without further host interaction. The EN pin enables hardware-controlled wake/sleep, and the INT pin signals sequence completion. This self-contained operation makes LP5523TM/NOPB especially valuable in ultra-low-power or MCU-offload scenarios where LP5523TM/NOPB sustains visual functionality independently.

What protection features does the LP5523TM/NOPB include for LED reliability?

The LP5523TM/NOPB integrates multiple hardware-level protections: overcurrent and short-circuit detection in the charge pump; thermal shutdown at 125°C; built-in LED open/short fault detection with VF measurement capability; and soft-start circuitry to limit inrush current during power-up. Its high-side driver architecture inherently prevents shoot-through, and the 200-nA standby current minimizes battery drain during idle periods. These features collectively ensure robust LED operation in consumer electronics environments - directly contributing to field reliability of LP5523TM/NOPB in production deployments.

Is the LP5523TM/NOPB compatible with standard I²C buses and what address options exist?

Yes - the LP5523TM/NOPB implements a fully compliant two-wire I²C interface supporting Fast Mode (400 kHz). It offers four unique slave addresses selectable via the ASEL0 and ASEL1 pins (00, 01, 10, 11), enabling up to four LP5523TM/NOPB devices on a single bus without address conflict. Level-shifting is not required: logic inputs accept 0.2×VDD to 0.8×VDD thresholds, and SDA is open-drain with 3-mA sink capability. This flexibility simplifies system integration and scalability - particularly important in multi-LED zone architectures where LP5523TM/NOPB devices coordinate via shared I²C and TRIG lines.