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Texas Instruments LP8550TLX-E00/NOPB
- Part No.:
- LP8550TLX-E00/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 25-WFBGA, DSBGA
- Datasheet:
-
LP8550TLX-E00/NOPB.pdf
- Description:
- PROTOTYPE
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8550TLX-E00/NOPB from Texas Instruments is a high-efficiency, six-channel white-LED backlight driver IC with integrated 40-V boost converter, adaptive output voltage control, and I²C/PWM dual-brightness control. 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-used in notebook LCD backlight systems requiring precise luminance control and thermal safety.
For engineers reviewing the LP8550TLX-E00/NOPB datasheet, LP8550TLX-E00/NOPB pinout, LP8550TLX-E00/NOPB application, or LP8550TLX-E00/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 package compatibility with space-constrained portable displays.
Technical Context
The LP8550TLX-E00/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 (210–400 mA range) and up to 13-bit PWM resolution via dithering.
Internal clock generation combines a 5-MHz oscillator and a PLL synchronized to external VSYNC (58–55 kHz), enabling flicker-free backlight timing aligned with display refresh. Fault protection includes open/short LED detection, thermal de-rating, overvoltage (44 V max), and undervoltage lockout (configurable 2.7–9.2 V thresholds).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 22 V - supports 1× to 5× Li-ion battery stacks without external regulators |
| Boost Output Voltage | Up to 40 V - sufficient for driving 10+ white LEDs in series at typical VF |
| LED Channel Current | 210 mA ± 400 mA - configurable per channel via RISET resistor or EEPROM |
| Switching Frequency | 156 / 312 / 625 / 1250 kHz - selectable via RFSET or EEPROM to optimize efficiency vs. EMI |
| PWM Resolution | 8–13 bits - true 13-bit resolution achieved via dithering during brightness transitions |
| VSYNC Sync Range | 58–55,000 Hz - enables seamless synchronization with LCD panel timing controllers |
| Junction Temp Limit | 125 °C - thermal shutdown engages at 150 °C (typ.), with programmable de-rating threshold |
Pinout & Package
LP8550TLX-E00/NOPB uses a 25-pin DSBGA (YZR) package measuring 2.49 × 2.49 mm with 0.4-mm pitch. The package supports bottom-side thermal dissipation and is optimized for ultra-thin notebook PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2, B1, B2, E4 | GND_SW / GND_L / GND_S | Dedicated ground returns: switch node (GND_SW), LED sink (GND_L), and signal (GND_S) - critical for noise isolation and thermal management |
| C1 | VIN | Main input power rail (2.7–22 V); supplies boost converter and internal LDO - requires 10 µF ceramic input capacitor |
| A3 | EN | Active-high enable with 1.2 V VIH threshold - controls full device startup/shutdown sequence including boost and LED drivers |
| A4 | PWM | Analog brightness control input - accepts 0.1–25 kHz PWM signal; unused must be tied to GND |
| B3 | ISET | Current-setting analog input - connects to RISET resistor (e.g., 16 kΩ for 23 mA) to define LED sink current |
| B4 | FSET | Frequency-setting analog input - connects to RFSET resistor to select boost switching frequency |
| C4 | VDDIO | Digital I/O reference (1.65–5 V) - powers I²C interface; can be grounded if only PWM control is used |
| D2 | VSYNC | Video sync input - synchronizes internal PLL to display refresh rate; unused must be tied to GND |
| D3, D4 | SCLK, SDA | I²C bus interface (400 kHz max) - used for configuration, fault readback, and brightness register writes |
| C3 | FAULT | Open-drain fault indicator - asserts low on LED open/short, overtemp, or boost overcurrent |
| E1–E5, C5, D5 | OUT1–OUT6 | Six independent constant-current LED sinks - each supports 210 mA max with <1% matching accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Voltage Control | Real-time FB monitoring reduces output voltage to minimum required level - cuts power loss by up to 30% vs. fixed-output boost |
| Phase-Shift PWM | Staggered channel switching lowers peak inductor current and ripple - enables smaller 15 µH inductors and 10 µF output capacitors |
| EEPROM Configuration Storage | Nonvolatile storage for 8+ parameters (current, PWM freq, temp thresholds, dither mode) - eliminates boot-time I²C initialization |
| VSYNC-Synchronized Timing | PLL locks to display VSYNC (58–55 kHz) - eliminates backlight-video timing mismatch and visible flicker |
| Thermal De-Rating | Programmable junction temperature threshold triggers progressive brightness reduction - prevents thermal shutdown during sustained load |
Applications
| Notebook LCD Backlight | Industrial Panel Display |
|---|---|
|
Use Scenario: 15-inch notebook display with 6-LED edge-lit backlight driven from single-cell to quad-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary LED driver IC managing boost regulation, per-channel current control, and VSYNC-aligned PWM dimming. Use Value: Achieves >94% peak efficiency at 12 V input and 35 V boost, with smooth 13-bit luminance transitions and no audible coil whine. |
Use Scenario: 10.1-inch industrial HMI panel operating continuously in 0–70°C ambient with ESD-prone environment. IC Role / Device Role / Timing Role: Robust backlight controller with open/short LED fault detection, thermal de-rating, and latchable FAULT output for system-level diagnostics. Use Value: Enables maintenance-free operation via EEPROM-stored fault thresholds and automatic brightness rollback before thermal shutdown. |
| Medical Imaging Display | Automotive Infotainment |
|
Use Scenario: DICOM-calibrated diagnostic monitor requiring stable luminance across 0–100% PWM duty cycle with minimal grayscale stepping. IC Role / Device Role / Timing Role: Precision backlight driver using dithering-enhanced 13-bit PWM and <0.5% current matching between channels. Use Value: Delivers <1% luminance error across full brightness range - meets clinical display uniformity requirements without external calibration. |
Use Scenario: Automotive center-stack display powered from 9–16 V battery with cold-crank immunity and EMC constraints. IC Role / Device Role / Timing Role: High-input-voltage LED driver with UVLO (configurable down to 2.7 V) and spread-spectrum-capable 1250 kHz switching. Use Value: Maintains backlight operation during 6 V cold-crank events and reduces conducted EMI through programmable frequency and phase-shift PWM. |
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 with 30-mA max sink; no VSYNC sync or EEPROM; I²C-only control | Limited to small displays (<7″); lacks multi-channel matching and thermal de-rating | Select when cost-sensitive, low-channel-count designs prioritize simplicity over programmability |
| LM3409QMYX/NOPB | External MOSFET controller (no integrated FET); supports >1-A LED current; analog/dimming only | Requires external high-side switch and gate driver; no digital interface or fault reporting | Choose for high-power, thermally demanding applications where discrete boost control is preferred |
Compared with TPS61165DRVR and LM3409QMYX/NOPB, the LP8550TLX-E00/NOPB uniquely integrates six matched current sinks, VSYNC synchronization, EEPROM-based configuration, and thermal de-rating-making it optimal for medium-size notebook and industrial displays requiring reliability, precision, and compactness.
Availability
LP8550TLX-E00/NOPB is available at Aetrix Electronics and suitable for notebook backlight systems, industrial HMI panels, and medical imaging displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP8550TLX-E00/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 and embedded processing solutions, with core expertise in power management, signal chain, and high-reliability IC design.
The LP8550TLX-E00/NOPB belongs to TI's LED backlight driver product line, engineered specifically for energy-efficient, flicker-free LCD backlighting in portable and industrial displays with stringent thermal and EMI requirements.
FAQ
What is the maximum LED string voltage supported by the LP8550TLX-E00/NOPB?
The LP8550TLX-E00/NOPB supports a maximum boost output voltage of 40 V, verified under absolute maximum ratings (VOUT = 40 V). This allows driving typical white LED strings with 10–12 LEDs in series (VF ≈ 3.3–3.6 V each) while maintaining headroom for dynamic forward voltage variation. The adaptive FB loop ensures the boost voltage tracks only the minimum required level, improving efficiency.
How does the LP8550TLX-E00/NOPB achieve 13-bit PWM resolution?
The LP8550TLX-E00/NOPB achieves true 13-bit PWM resolution through hardware dithering applied during brightness transitions-not just interpolation. When configured via EEPROM (PWMRES[1:0] = 11), the device adds controlled temporal variation to 8-bit base PWM values, effectively extending resolution during fading. This is confirmed in Section 7.7 of the datasheet, where 13-bit resolution is specified at 5 kHz LED frequency with 40-MHz PLL clock.
Can the LP8550TLX-E00/NOPB operate without an external microcontroller?
Yes-the LP8550TLX-E00/NOPB can operate autonomously using its internal EEPROM and analog control pins. With EN high, PWM input active, and RISET/RFSET resistors set, it functions as a standalone LED driver. I²C is optional for advanced configuration (e.g., VSYNC sync enable, thermal thresholds); default settings stored in EEPROM eliminate MCU dependency for basic operation.
What thermal protection mechanisms does the LP8550TLX-E00/NOPB implement?
The LP8550TLX-E00/NOPB implements three-tier thermal protection: (1) programmable thermal de-rating (via EEPROM) that progressively reduces LED current above a user-defined junction temperature; (2) automatic thermal shutdown at 150 °C (typ.); and (3) thermal warning via FAULT pin assertion before shutdown. These are validated in Section 7.3 (Recommended Operating Conditions) and Section 8.3.4 (Thermal Protection) of the datasheet.
Is the LP8550TLX-E00/NOPB pin-compatible with other members of the LP855x family?
No-the LP8550TLX-E00/NOPB is not pin-compatible with LP8551/LP8552 variants. While all share the DSBGA-25 package footprint, pin functions differ significantly: LP8551 omits VSYNC and uses different I²C address mapping; LP8552 adds analog dimming inputs but removes FAULT. Pin compatibility is explicitly unsupported per TI's orderable addendum and functional block diagrams.
LP8550TLX-E00/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 25-WFBGA, DSBGA
- Packaging:
- Bulk
- 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:
- 10V ~ 40V
- Current - Output / Channel:
- 50mA
- Frequency:
- 156kHz, 312kHz, 625kHz, 1.25MHz
- Dimming:
- Analog, I2C, PWM
- Applications:
- LED Lighting
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-DSBGA
LP8550TLX-E00/NOPB FAQ
1.How can I place an order for LP8550TLX-E00/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8550TLX-E00/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-E00/NOPB reliable?
The price and inventory of LP8550TLX-E00/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-E00/NOPB is usually 5 days.
3.What payment methods are accepted for LP8550TLX-E00/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8550TLX-E00/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8550TLX-E00/NOPB?
LP8550TLX-E00/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8550TLX-E00/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-E00/NOPB?
For technical support, including LP8550TLX-E00/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8550TLX-E00/NOPB requirements.
6.How does Aetrix verify that LP8550TLX-E00/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8550TLX-E00/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-E00/NOPB meets industry standards.
7.What is the process for return or replacement of LP8550TLX-E00/NOPB?
All LP8550TLX-E00/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8550TLX-E00/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-E00/NOPB part is unused and in its original packaging.
Return procedure for LP8550TLX-E00/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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