Texas Instruments LP8553TLE/NOPB

Overview

LP8553TLE/NOPB from Texas Instruments is a high-efficiency, four-channel white LED backlight driver IC with integrated 40V boost converter, programmable 8–13-bit PWM dimming, and adaptive output-voltage control for notebook LCD displays. It supports 2.7V–22V input, delivers up to 210 mA per channel (max 400 mA total), and features VSYNC synchronization, phase-shift PWM, and EEPROM-configurable thermal de-rating.

For engineers reviewing the LP8553TLE/NOPB datasheet, LP8553TLE/NOPB pinout, LP8553TLE/NOPB application, or LP8553TLE/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, DSBGA-25 pin mapping, safety-critical fault detection behavior, and validated alternative options for LED backlight systems requiring stable efficiency across battery voltage ranges.

Technical Context

The LP8553TLE/NOPB integrates a current-mode DC/DC boost converter with adaptive feedback (FB pin) that dynamically adjusts VBOOST to the minimum required for forward voltage of connected LED strings-reducing power loss and ripple. Its four independent current-sink outputs (OUT1–OUT4) support ±3% output current accuracy and <0.5% matching at 23 mA, with saturation voltage as low as 105 mV.

Timing and control are managed via dual clock paths: a 5–40 MHz PLL synchronized to external VSYNC (58–55 kHz range) or internal oscillator, enabling glitch-free, flicker-free dimming. Brightness is controlled either by analog PWM input (0.1–25 kHz), I²C register writes, or hybrid PWM+current mode-automatically switching between dimming methods to maximize optical efficiency.

Key Specifications

Pinout & Package

LP8553TLE/NOPB uses TI's DSBGA-25 package (YZR002511A), 2.466 mm × 2.466 mm × 0.6 mm, with 25 bumps arranged in 5×5 array. Bump pitch is 0.4 mm; solder mask defined (SMD); no exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61165DRVR and LM3409QMYX/NOPB, the LP8553TLE/NOPB uniquely combines quad-channel current sinks, VSYNC synchronization, EEPROM-based configurability, and adaptive thermal management in a single DSBGA package-making it optimal for space-constrained, high-reliability notebook and medical display applications where flicker, efficiency, and safety are non-negotiable.

Availability

LP8553TLE/NOPB is available at Aetrix Electronics and suitable for notebook backlight systems, industrial HMIs, and medical display modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LP8553TLE/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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision power conversion and display interface solutions.

The LP8553TLE/NOPB belongs to TI's high-efficiency LED backlight driver product line, designed specifically for space-constrained, battery-powered LCD displays requiring flicker-free dimming, adaptive power optimization, and robust fault handling.

FAQ

What is the maximum LED string voltage supported by the LP8553TLE/NOPB?

The LP8553TLE/NOPB supports up to 40V on its OUT1–OUT4 pins and VBOOST node, enabling driving of up to 10–12 white LEDs in series per channel (assuming typical 3.2–3.6V forward voltage). Absolute maximum rating is 44V, but recommended operating limit is 40V for reliability and thermal margin. This makes LP8553TLE/NOPB suitable for mainstream 13–15.6″ notebook panels.

Does the LP8553TLE/NOPB require an external microcontroller to operate?

No - the LP8553TLE/NOPB can operate autonomously using its PWM input pin and resistor-programmed settings (RISET, RFSET). Internal EEPROM stores configuration (current, PWM frequency, thermal thresholds), so no host MCU is needed for basic functionality. However, an MCU is required for advanced features like real-time I²C reconfiguration, fault logging, or dynamic brightness curves - all fully supported by LP8553TLE/NOPB.

How does the LP8553TLE/NOPB handle thermal overload conditions?

The LP8553TLE/NOPB implements two-tier thermal protection: first, programmable thermal de-rating (via EEPROM TEMP_LIM bits) gradually reduces LED current as junction temperature approaches threshold; second, hard thermal shutdown activates at TJ ≈ 150°C, disabling boost and LED outputs until temperature falls to ~130°C. Both mechanisms are hardware-enforced and reported via FAULT pin and I²C status register - critical for LP8553TLE/NOPB deployment in sealed enclosures.

Can the LP8553TLE/NOPB synchronize to non-standard VSYNC frequencies?

Yes - the LP8553TLE/NOPB PLL accepts VSYNC inputs from 58 Hz to 55 kHz, covering standard 60 Hz notebook refresh, 120 Hz gaming panels, and industrial displays with custom frame rates. The 13-bit PLL[12:0] register allows fine-tuning for exact lock, and internal logic maintains stable PWM output even during brief VSYNC dropouts - ensuring continuous, flicker-free operation for LP8553TLE/NOPB in variable-refresh-rate systems.

What is the role of the FILTER pin on the LP8553TLE/NOPB?

The FILTER pin connects to an RC network (typically 120 kΩ + 100 nF) that sets PLL loop bandwidth and lock time to VSYNC. A larger time constant increases stability but slows synchronization (seconds to lock); smaller values speed lock but risk jitter. This passive filter enables robust VSYNC tracking across temperature and voltage variations - a key enabler for LP8553TLE/NOPB's flicker-free performance in real-world display systems.