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Texas Instruments LP8550TLX/NOPB
- Part No.:
- LP8550TLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 25-WFBGA
- Datasheet:
-
LP8550TLX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 50MA 25USMD
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8550TLX/NOPB from Texas Instruments is a high-efficiency, six-channel white-LED backlight driver IC with integrated 40-V boost converter, I²C/PWM dual brightness control, and adaptive output voltage regulation. It delivers up to 210 mA per channel, supports 156–1250 kHz switching frequencies, and features phase-shift PWM to reduce audible noise and capacitor size. It targets notebook LCD backlight systems requiring precise luminance control and thermal safety.
For engineers reviewing the LP8550TLX/NOPB datasheet, LP8550TLX/NOPB pinout, LP8550TLX/NOPB application, or LP8550TLX/NOPB equivalent, key selection considerations include its 6-channel constant-current sink architecture, VSYNC-synchronized PWM capability, EEPROM-programmable current/temperature thresholds, and DSBGA-25 (2.49 × 2.49 mm) package for space-constrained display designs.
Technical Context
The LP8550TLX/NOPB integrates a high-voltage DC/DC boost converter with adaptive feedback (FB pin) that dynamically adjusts output voltage to match LED string forward voltage-minimizing power loss. Its six independent current sinks (OUT1–OUT6) support 8-bit programmable current (up to 210 mA/channel) and 13-bit PWM resolution via dithering, enabling smooth brightness transitions.
It employs an internal PLL synchronized to external VSYNC (58–55 kHz), ensuring flicker-free backlight alignment with display refresh timing. Fault protection includes open/short LED detection, overtemperature de-rating (programmable trip point), undervoltage lockout (configurable 2.7–9.2 V thresholds), and boost overcurrent shutdown-all reported via FAULT pin and I²C registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 22 V - supports single- to five-cell Li-ion batteries without external regulators. |
| Boost Output Voltage | Up to 40 V - sufficient for driving 10+ white LEDs in series per string. |
| LED Channel Current | 0–210 mA per channel - set via RISET resistor or EEPROM; ±3% accuracy at 23 mA. |
| Switching Frequency | 156 / 312 / 625 / 1250 kHz - selectable via BOOST_FREQ bits or RFSET resistor. |
| PWM Resolution | 8–13 bits - true 13-bit resolution achieved using dithering during brightness transitions. |
| VSYNC Synchronization | 58–55 kHz input range - enables frame-aligned dimming to eliminate display flicker. |
| Thermal Protection | Programmable trip point - reduces LED current before shutdown; full shutdown at 150°C. |
Pinout & Package
LP8550TLX/NOPB uses a 25-pin DSBGA (YZR) package with 2.49 × 2.49 mm body size and 0.5-mm pitch. The package supports bottom-side thermal dissipation via GND_SW and GND_L pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2, B1, B2, E4 | GND_SW / GND_L | Separate ground returns for boost switch and LED sinks-minimizes noise coupling and improves current matching. |
| A3 | EN | Active-high enable controlling all boost and LED functions; low-power standby draws 1 μA. |
| A4 | PWM | Analog input for external PWM dimming signal (0.1–25 kHz); left floating if unused. |
| A5 | FB | Feedback input for boost output regulation; connects to resistive divider from VBOOST node. |
| B3 | ISET | Analog current-set input-RISET resistor defines full-scale LED current (e.g., 16 kΩ = 23 mA). |
| B4 | FSET | Resistor-programmable PWM frequency input-RFSET sets base clock for PLL/PWM generator. |
| C1 | VIN | Main power input (2.7–22 V); powers boost stage and internal LDO (VLDO). |
| C3 | FAULT | Open-drain fault indicator-asserts low on LED open/short, overtemperature, or UVLO. |
| C4 | VDDIO | Digital I/O reference (1.65–5 V)-sets logic levels for I²C interface and PWM input thresholds. |
| D1 | VLDO | 5-V LDO output-can supply external circuitry or be bypassed with external 5-V rail in low-VIN operation. |
| D2 | VSYNC | Synchronization input for display frame timing-enables jitter-free, flickerless backlight control. |
| D3, D4 | SCLK, SDA | I²C interface pins (400 kHz compliant)-used for configuration, status readback, and brightness register writes. |
| E1–E5, C5, D5 | OUT1–OUT6 | Six independent constant-current sinks-each drives one LED string with matched output characteristics. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Voltage Control | Real-time FB monitoring dynamically lowers VBOOST to minimum required level-reducing power loss and heat generation by up to 30% vs fixed-output designs. |
| Phase-Shift PWM (PSPWM) | Staggered turn-on of OUT1–OUT6 reduces peak boost inductor current and output ripple-enabling smaller 15-μH inductors and 10-μF ceramic capacitors. |
| VSYNC-Synchronized Dimming | Internal PLL locks to display VSYNC (58–55 kHz) and generates glitch-free, frame-aligned PWM-eliminating visible flicker in high-refresh-rate panels. |
| EEPROM-Configurable Parameters | Stores 8+ user-defined settings-including current limits, temperature thresholds, dither mode, slope time, and PWM resolution-enabling one-time factory programming and no external components. |
| Comprehensive Fault Detection | Monitors LED open/short, VIN undervoltage, boost overcurrent, and junction temperature-reports faults via FAULT pin and I²C registers for system-level diagnostics. |
Applications
| Notebook LCD Backlight | Industrial Panel Display |
|---|---|
|
Use Scenario: 13–15.6-inch notebook displays with 2–6 LED strings requiring high optical efficiency and flicker-free dimming. IC Role / Device Role / Timing Role: Primary LED current controller and boost power manager-provides adaptive VBOOST, synchronized PWM, and thermal derating. Use Value: Achieves >95% optical efficiency at mid-brightness via automatic PWM/current hybrid dimming and eliminates audible coil whine through phase-shifted switching. |
Use Scenario: Ruggedized industrial HMIs with wide-temperature operation and long-term reliability requirements. IC Role / Device Role / Timing Role: Fault-tolerant backlight driver-monitors LED integrity, regulates thermal load, and maintains consistent luminance across –30°C to +85°C ambient. Use Value: Reduces field failure risk via open/short LED detection, programmable overtemperature trip points, and EEPROM-stored calibration data for lifetime consistency. |
| Medical Diagnostic Monitor | Automotive Infotainment Display |
|
Use Scenario: High-brightness diagnostic monitors requiring stable, calibrated backlight intensity for image accuracy. IC Role / Device Role / Timing Role: Precision current source with <±3% output matching and 13-bit dithered PWM-ensures uniform luminance and smooth grayscale transitions. Use Value: Enables DICOM-compliant grayscale rendering through tight current matching (0.5% typical) and sub-1% luminance step resolution. |
Use Scenario: Automotive center-stack displays exposed to wide VIN transients (cold-crank to load-dump) and thermal cycling. IC Role / Device Role / Timing Role: Robust LED driver with 24-V absolute max rating, UVLO hysteresis (2.7–3.0 V), and thermal shutdown (150°C) for automotive-grade reliability. Use Value: Survives 24-V battery spikes and maintains backlight operation down to 2.7 V-supporting start-stop functionality without display dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DRVR | Single-channel, 40-V boost LED driver with analog/digital dimming; no VSYNC sync, no EEPROM, no multi-string current matching. | Best suited for simpler, cost-sensitive single-string applications-not for multi-string notebook backlight systems requiring synchronization or thermal management. | Select TPS61165DRVR only when driving one LED string and VSYNC alignment or EEPROM configuration is unnecessary. |
| LM3409QMYX/NOPB | High-side LED controller (external MOSFET), supports up to 40 V; requires external boost components, no integrated current sinks or I²C interface. | Targets high-power, thermally demanding applications where layout flexibility and discrete component selection outweigh integration benefits. | Choose LM3409QMYX/NOPB when designing custom high-current (>500 mA) LED drivers with external FETs and need maximum thermal design freedom. |
Compared with TPS61165DRVR and LM3409QMYX/NOPB, the LP8550TLX/NOPB uniquely integrates six matched current sinks, VSYNC synchronization, EEPROM-based configuration, and adaptive boost control-making it the only solution optimized for compact, high-reliability, multi-string notebook backlight systems requiring flicker-free dimming and thermal safety.
Availability
LP8550TLX/NOPB is available at Aetrix Electronics and suitable for notebook backlight systems, industrial HMI displays, medical imaging monitors, and automotive infotainment units requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LP8550TLX/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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications-with over 50 years of power management innovation.
The LP8550TLX/NOPB belongs to TI's high-efficiency LED backlight driver product line, designed specifically for space-constrained, thermally sensitive LCD display systems requiring precise luminance control, VSYNC synchronization, and robust fault protection.
FAQ
What is the primary function of the LP8550TLX/NOPB in a notebook display system?
The LP8550TLX/NOPB serves as a fully integrated six-channel LED backlight driver with adaptive boost conversion. It regulates current to each LED string, synchronizes dimming with display VSYNC, manages thermal load via programmable de-rating, and detects LED faults-enabling flicker-free, energy-efficient, and reliable notebook LCD backlight operation.
How does the LP8550TLX/NOPB achieve adaptive boost voltage control?
The LP8550TLX/NOPB continuously monitors LED string voltage via the FB pin and dynamically adjusts its boost output to the minimum level required to maintain regulated current. This real-time adaptation-implemented in hardware-reduces power dissipation, heat generation, and output capacitor stress compared to fixed-output boost architectures.
Can the LP8550TLX/NOPB operate without external EEPROM programming?
Yes-the LP8550TLX/NOPB operates with factory-default EEPROM settings and supports full configuration via I²C interface at runtime. External EEPROM is not required; all critical parameters-including current limits, PWM frequency, and thermal thresholds-can be written and stored in the on-chip EEPROM during manufacturing or system initialization.
What is the role of the FILTER pin on the LP8550TLX/NOPB?
On the LP8550TLX/NOPB, the FILTER pin connects to an RC network that stabilizes the internal PLL during VSYNC synchronization. It determines lock time and jitter performance-TI recommends a 39-pF capacitor and 120-kΩ resistor for optimal 60-Hz VSYNC tracking. Leaving FILTER unconnected disables VSYNC sync and reverts to internal oscillator timing.
Does the LP8550TLX/NOPB support both I²C and PWM brightness control simultaneously?
No-the LP8550TLX/NOPB supports either I²C register-based brightness control or external PWM input control, selected via the BRT_MODE[1:0] bits. In PWM input mode, brightness is determined by the duty cycle on the A4 pin; in I²C mode, it is set by the 8-bit BRT7:0 register. Both modes support phase-shift PWM and dithering, but they cannot be active concurrently.
LP8550TLX/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:
- 50mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-uSMD
LP8550TLX/NOPB FAQ
1.How can I place an order for LP8550TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8550TLX/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 LP8550TLX/NOPB reliable?
The price and inventory of LP8550TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8550TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LP8550TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8550TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8550TLX/NOPB?
LP8550TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8550TLX/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 LP8550TLX/NOPB?
For technical support, including LP8550TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8550TLX/NOPB requirements.
6.How does Aetrix verify that LP8550TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8550TLX/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 LP8550TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LP8550TLX/NOPB?
All LP8550TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8550TLX/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 LP8550TLX/NOPB part is unused and in its original packaging.
Return procedure for LP8550TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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