Texas Instruments LP8553TLX/S7002758

Overview

LP8553TLX/S7002758 from Texas Instruments is a high-efficiency, four-channel white LED backlight driver IC with integrated 40 V boost converter, programmable 8–13-bit PWM dimming, I²C/PWM dual brightness control, and adaptive output-voltage regulation for notebook LCD displays. It delivers up to 210 mA per channel (±400 mA total), supports 2.7–22 V input, and operates in DSBGA-25 package.

For engineers reviewing the LP8553TLX/S7002758 datasheet, LP8553TLX/S7002758 pinout, LP8553TLX/S7002758 application, or LP8553TLX/S7002758 equivalent, key selection considerations include its phase-shift PWM architecture for reduced audible noise, VSYNC-synchronized timing, thermal de-rating capability, and EEPROM-configurable current, frequency, and fault thresholds - all critical for compact, high-reliability display power designs.

Technical Context

The LP8553TLX/S7002758 integrates a high-voltage DC/DC boost converter with adaptive output voltage control that dynamically adjusts VBOOST based on real-time LED string voltage feedback (FB pin), minimizing power loss across varying forward voltages. Its internal 5 MHz oscillator feeds a programmable PLL supporting 5–40 MHz clock multiplication for precise PWM resolution scaling.

Four independent current-sink outputs (OUT1–OUT4) support simultaneous constant-current driving with ±3% output accuracy and <0.5% matching between channels. Brightness is controlled via either external PWM input (0.1–25 kHz) or I²C register writes, with automatic transition between PWM-only and hybrid PWM+current dimming modes to maximize optical efficiency at mid-to-high brightness levels.

Key Specifications

Pinout & Package

LP8553TLX/S7002758 is housed in a 2.466 mm × 2.466 mm × 0.6 mm DSBGA-25 bump package (YZR002511A), optimized for ultra-thin notebook PCB layouts with minimal footprint and thermal resistance (θJA = 40–73°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61165DRVR and LM3409QMY/NOPB, LP8553TLX/S7002758 offers superior integration for multi-string notebook backlights - delivering matched current sinks, embedded VSYNC synchronization, and nonvolatile configuration in a single DSBGA package - whereas alternatives require additional ICs, layout effort, or sacrifice precision and noise performance.

Availability

LP8553TLX/S7002758 is available at Aetrix Electronics and suitable for notebook backlight systems, industrial HMI displays, medical imaging monitors, and portable computing platforms requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LP8553TLX/S7002758 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 display power solutions and automotive-grade reliability standards.

LP8553TLX/S7002758 belongs to TI's high-efficiency LED backlight driver product line, engineered specifically for space-constrained, thermally sensitive notebook and netbook displays requiring precise luminance control, low EMI, and robust fault handling.

FAQ

What is the maximum LED string voltage supported by the LP8553TLX/S7002758?

The LP8553TLX/S7002758 supports a maximum boost output voltage of 40 V, verified in Absolute Maximum Ratings and Electrical Characteristics tables. This allows driving up to 10–12 white LEDs in series (assuming 3.0–3.5 V forward voltage per LED at operating current). The device implements adaptive output-voltage control via the FB pin to maintain only the necessary VBOOST, improving efficiency across varying LED Vf and temperature conditions. Operation above 40 V risks permanent damage.

Does the LP8553TLX/S7002758 support synchronization to external video timing signals?

Yes, the LP8553TLX/S7002758 supports direct VSYNC synchronization via its dedicated D2 pin. An internal PLL locks to incoming VSYNC signals ranging from 58 Hz to 55 kHz, ensuring zero-phase jitter between backlight PWM output and display panel refresh. This eliminates beat patterns and flicker in motion video. The FILTER pin (C2) sets PLL loop bandwidth, affecting lock time - a 100 nF capacitor yields ~2-second lock to 60 Hz VSYNC.

How is LED current set on the LP8553TLX/S7002758 - via register or external resistor?

LED current on the LP8553TLX/S7002758 is set using both methods: an external RISET resistor (connected to B3/ISET pin) provides primary analog current programming (e.g., 16 kΩ → 23 mA), while EEPROM-stored CURRENT[7:0] bits allow fine digital trimming (±3% accuracy). The resistor-based setting remains active even after power cycle, while register values persist in EEPROM. This dual approach enables factory calibration without runtime I²C writes and supports dynamic adjustment during operation.

What fault conditions does the LP8553TLX/S7002758 detect and report?

The LP8553TLX/S7002758 detects and reports LED open/short faults per channel (OUT1–OUT4), input under-voltage (UVLO thresholds configurable via UVLO[1:0]), boost overcurrent (via SW pin current limit), junction overtemperature (with programmable thermal derating and hard shutdown at 150°C), and internal LDO failure. All faults assert the open-drain FAULT pin low and populate corresponding bits in the I²C STATUS register, enabling both hardware interrupt response and software diagnostics.

Can the LP8553TLX/S7002758 operate from a 3.7 V single-cell Li-ion battery?

Yes, the LP8553TLX/S7002758 supports input voltages as low as 2.7 V, making it compatible with single-cell Li-ion batteries (nominal 3.7 V, range 2.8–4.2 V). In low-VIN applications, the datasheet specifies use of an external 5 V rail connected to VLDO (D1) and VIN (C1) to ensure proper LDO operation and boost startup - this avoids reliance on the internal LDO during deep discharge. Typical Application (2) confirms functionality down to 2.7 V with external 5 V assist.