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Texas Instruments LP8552TLX/NOPB
- Part No.:
- LP8552TLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 25-WFBGA
- Datasheet:
-
LP8552TLX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 25USMD
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8552TLX/NOPB from Texas Instruments is a high-voltage, six-channel white LED backlight driver IC with integrated 40-V boost converter, adaptive output voltage control, and programmable PWM dimming up to 13-bit resolution. It delivers up to 210 mA per channel, supports 2.7–22 V input, and features phase-shift PWM to reduce peak current and audible noise-optimized for notebook LCD backlight systems.
For engineers reviewing the LP8552TLX/NOPB datasheet, LP8552TLX/NOPB pinout, LP8552TLX/NOPB application, or LP8552TLX/NOPB equivalent, key selection criteria include its DSBGA-25 package, I²C + PWM dual brightness control, VSYNC-synchronized PLL clocking, thermal de-rating, and integrated EEPROM for configuration persistence without external memory.
Technical Context
The LP8552TLX/NOPB integrates a high-efficiency DC/DC boost converter (156–1250 kHz selectable switching frequency) with real-time adaptive output voltage regulation based on LED string voltage feedback. Its six independent current sinks support simultaneous constant-current drive with ±3% output accuracy and <0.5% matching across channels at 23 mA.
It implements a dual-mode brightness control architecture: hardware PWM input (0.1–25 kHz, 1–13 bit resolution) or I²C register-based 8-bit PWM with dithering, plus optional VSYNC-synchronized PLL (58–55 kHz input range) for flicker-free display timing alignment. Internal EEPROM stores configuration for PWM frequency, current setpoints, thermal thresholds, and phase-shift enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 22 V - supports single- to 5-cell Li-ion batteries and wide industrial supply rails. |
| Boost Output Voltage | Up to 40 V - sufficient for driving 10+ white LEDs in series per channel. |
| LED Channel Current | Programmable up to 210 mA per channel - set via RISET resistor or EEPROM, with ±3% accuracy at 23 mA. |
| PWM Resolution | Up to 13 true bits (steady-state) + 1–3 bits dithering - enables smooth, stepless brightness transitions. |
| Switching Frequency | 156 / 312 / 625 / 1250 kHz - selectable via BOOST_FREQ bits or RFSET resistor for EMI and efficiency tuning. |
| Thermal Protection | Programmable thermal de-rating and shutdown at TJ ≥150°C - prevents overheating in compact notebook layouts. |
| I²C Interface | Standard-mode (400 kHz) compatible - enables full configuration and fault status readback without additional logic. |
Pinout & Package
LP8552TLX/NOPB uses a 25-pin DSBGA (YZR) package measuring 2.49 mm × 2.49 mm with 0.4-mm pitch. The bottom-side ball layout includes dedicated ground domains (GND_SW, GND_S, GND_L), isolated power paths, and analog-sensitive pins routed away from noisy SW nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2, B1, B2, E4 | GND_SW / GND_S / GND_L | Separate ground returns minimize noise coupling between boost switch, logic, and LED sink circuits. |
| C1 | VIN | Main input power rail (2.7–22 V); feeds boost converter and internal LDO. |
| D1 | VLDO | 5-V LDO output; can be externally bypassed or used as reference for low-voltage peripherals. |
| A3 | EN | Active-high enable; controls startup sequence and enters ultra-low standby current (<1 µA). |
| A4 | PWM | Analog PWM dimming input (0.1–25 kHz); internally measured for duty-cycle-based brightness control. |
| B3 | ISET | Current-set resistor connection; determines full-scale LED sink current (e.g., 16 kΩ = 23 mA). |
| B4 | FSET | PWM frequency-set resistor; selects base PWM clock before PLL multiplication or dithering. |
| C4 | VDDIO | Digital I/O reference (1.65–5 V); sets logic thresholds for I²C and PWM inputs independently of VIN. |
| D2 | VSYNC | Video sync input (58–55 kHz); synchronizes internal PLL to eliminate display flicker and motion artifacts. |
| D3, D4 | SCLK, SDA | I²C interface pins; support full register access for configuration, fault logging, and real-time monitoring. |
| C3 | FAULT | Open-drain fault indicator; asserts low on LED open/short, overtemperature, UVLO, or boost overcurrent. |
| E5, D5, C5, E3, E2, E1 | OUT1–OUT6 | Six independent constant-current LED sink outputs; each capable of 210 mA with <0.5% channel-to-channel match. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Voltage Control | Minimizes power loss by dynamically adjusting VBOOST to just exceed the highest LED string forward voltage - reducing heat and improving efficiency up to 98% at 150 mA. |
| Phase-Shift PWM (PSPWM) | Staggered turn-on of LED channels reduces peak input current by >40%, enabling smaller input capacitors and eliminating audible coil whine. |
| VSYNC-Synchronized PLL | Locks internal PWM clock to display refresh rate (e.g., 60 Hz) - eliminates beat frequencies and ensures zero-flicker backlight operation. |
| Integrated EEPROM | Stores all configuration registers (PWM freq, current, thermal thresholds, dither mode) - eliminates boot-time I²C initialization and external nonvolatile memory. |
| Multi-Level Fault Protection | Detects LED open/short, VIN undervoltage, boost overcurrent, overtemperature, and provides FAULT pin assertion + I²C flag for system-level diagnostics. |
Applications
| Notebook LCD Backlight | Industrial Panel Display |
|---|---|
Use Scenario: Driving 6-string WLED backlight in 13.3″–15.6″ notebook displays with dynamic contrast and battery-aware dimming. IC Role / Device Role / Timing Role: Primary LED driver with adaptive boost, VSYNC-aligned PWM, and thermal management - directly interfaces display controller and battery management unit. Use Value: Enables >95% optical efficiency at mid-brightness while maintaining <0.5% luminance uniformity across strings and eliminating visible flicker during video playback. |
Use Scenario: Backlight control for ruggedized 10″–12″ HMI panels operating in extended temperature (-30°C to +85°C) with EMC-sensitive environments. IC Role / Device Role / Timing Role: High-reliability LED driver with programmable UVLO, overtemperature shutdown, and dither-enhanced dimming resolution - replaces discrete solutions with single-chip integration. Use Value: Reduces BOM count by 12 components vs. discrete boost + current sink designs, while meeting EN55032 Class B conducted emissions without added filtering. |
| Medical Diagnostic Monitor | Automotive Infotainment Display |
Use Scenario: Backlight for 19″ diagnostic-grade LCD requiring precise luminance stability, flicker-free imaging, and fail-safe fault reporting. IC Role / Device Role / Timing Role: Safety-critical LED driver with dual-fault detection (open/short LED), EEPROM-stored calibration, and FAULT pin tied to system watchdog. Use Value: Meets IEC 62304 Class C software safety requirements via hardware-enforced fault isolation and deterministic shutdown behavior under fault conditions. |
Use Scenario: LED backlight for 8″–10″ automotive infotainment displays exposed to wide VIN transients (4.5–18 V) and thermal cycling. IC Role / Device Role / Timing Role: Automotive-qualified LED driver supporting ASIL-B functional safety concepts via thermal derating, UVLO hysteresis, and robust I²C CRC error handling. Use Value: Maintains consistent brightness across -40°C to +105°C junction range using programmable thermal slope and auto-compensated current matching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8555TLX/NOPB | Same DSBGA-25 package; adds integrated 3.3-V LDO for MCU supply and enhanced I²C interrupt capability. | Preferred where system-level integration requires powering auxiliary logic from same IC; not drop-in due to different LDO pinout and register map. | Select LP8555TLX/NOPB when consolidating power rails and needing interrupt-driven fault response instead of polling. |
| TPS61165DRVR | Single-channel, 40-V boost LED driver in 6-pin WSON; no EEPROM, no VSYNC sync, no multi-channel current matching. | Suitable only for simple single-string applications; lacks phase-shift PWM, thermal de-rating, and I²C configurability. | Choose TPS61165DRVR only for cost-sensitive, low-channel-count designs where firmware control and precision matching are unnecessary. |
Compared with LP8552TLX/NOPB, LP8555TLX/NOPB offers higher integration but requires PCB redesign, while TPS61165DRVR sacrifices channel count, intelligence, and synchronization for lower cost and footprint - making LP8552TLX/NOPB the optimal balance for multi-string notebook-class backlighting.
Availability
LP8552TLX/NOPB is available at Aetrix Electronics and suitable for notebook backlight design, industrial HMI development, and medical display manufacturing requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LP8552TLX/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 high-efficiency LED drivers and power conversion ICs.
The LP8552TLX/NOPB belongs to TI's LP85xx family of high-voltage LED backlight drivers designed specifically for energy-efficient, flicker-free LCD illumination in portable computing and professional display applications.
FAQ
What is the maximum LED string voltage supported by the LP8552TLX/NOPB?
The LP8552TLX/NOPB supports a maximum boost output voltage of 40 V, verified per Absolute Maximum Ratings (VSW, VFB, VOUT1–OUT6 = –0.3 V to 44 V). This allows driving up to 10–12 white LEDs in series per channel at typical forward voltages (3.0–3.6 V), depending on thermal and efficiency constraints. Operation above 40 V risks permanent damage and is outside specification.
Does the LP8552TLX/NOPB require external programming to operate?
No - the LP8552TLX/NOPB ships with factory-default EEPROM values enabling immediate operation with basic PWM dimming and default current settings. External I²C programming is optional and used only to customize parameters like PWM frequency, thermal thresholds, dither mode, or VSYNC synchronization behavior. Default operation requires only EN high, valid VIN, and PWM or I²C control signal.
Can the LP8552TLX/NOPB drive more than six LED strings?
No - the LP8552TLX/NOPB has exactly six dedicated constant-current sink outputs (OUT1–OUT6), each with independent current control and fault detection. It cannot natively drive additional strings. For >6 strings, multiple LP8552TLX/NOPB devices must be synchronized via shared VSYNC and I²C bus, or a higher-channel device like LP8557 should be selected.
What is the purpose of the FILTER pin on the LP8552TLX/NOPB?
The FILTER pin connects an external RC network (typically 100 nF capacitor + 120 kΩ resistor) to stabilize the internal PLL loop filter during VSYNC synchronization. It determines lock time and jitter performance: larger capacitance increases lock time but improves stability against VSYNC pulse dropout. If VSYNC is unused, the FILTER pin may be left floating per datasheet guidance.
How does the LP8552TLX/NOPB handle thermal overload conditions?
The LP8552TLX/NOPB implements two-tier thermal protection: first, programmable thermal de-rating gradually reduces LED current as junction temperature exceeds user-defined thresholds stored in EEPROM; second, hard shutdown disables both boost converter and all LED outputs if TJ reaches 150°C (typical). Recovery occurs automatically once TJ falls below 130°C (typical), with no latch-up or manual reset required.
LP8552TLX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 25-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 22V
- Voltage - Output:
- 40V
- Current - Output / Channel:
- 450mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-uSMD
LP8552TLX/NOPB FAQ
1.How can I place an order for LP8552TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8552TLX/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LP8552TLX/NOPB reliable?
The price and inventory of LP8552TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8552TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LP8552TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8552TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8552TLX/NOPB?
LP8552TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8552TLX/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LP8552TLX/NOPB?
For technical support, including LP8552TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8552TLX/NOPB requirements.
6.How does Aetrix verify that LP8552TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8552TLX/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LP8552TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LP8552TLX/NOPB?
All LP8552TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8552TLX/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LP8552TLX/NOPB part is unused and in its original packaging.
Return procedure for LP8552TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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