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Texas Instruments LP8550TLE/NOPB
- Part No.:
- LP8550TLE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 25-WFBGA
- Datasheet:
-
LP8550TLE/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 50MA 25USMD
- Quantity:
- Payment:
- Shipping:
Inventory:1,046
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Product details
Overview
LP8550TLE/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 2.7–22 V input, and features phase-shift PWM to reduce audible noise and capacitor size - deployed in notebook LCD backlight systems.
For engineers reviewing the LP8550TLE/NOPB datasheet, LP8550TLE/NOPB pinout, LP8550TLE/NOPB application, or LP8550TLE/NOPB equivalent, key selection considerations include its 6-channel constant-current sink architecture, programmable 156–1250 kHz boost switching frequency, 8–13-bit PWM resolution with dithering, thermal de-rating capability, and VSYNC-synchronized LED dimming for flicker-free display operation.
Technical Context
The LP8550TLE/NOPB integrates a current-mode DC/DC boost controller with adaptive feedback (via FB pin) that dynamically adjusts output voltage to match LED string forward voltage - minimizing power loss. Its six independent current sinks (OUT1–OUT6) support precise 8-bit current setting via RISET resistor or EEPROM, with ±3% typical output accuracy at 23 mA.
Internal clock generation combines a 5-MHz oscillator and a programmable PLL, enabling synchronization to external VSYNC (58–55 kHz) or HSYNC signals. Phase-shift PWM distributes LED turn-on timing across channels to suppress peak inductor current and EMI, while dithering adds 1–3 effective bits during brightness transitions for smooth luminance ramping without visible stepping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 22 V - supports single- to five-cell Li-ion battery inputs without external regulators. |
| Boost Output Voltage | Up to 40 V - sufficient for driving 10+ white LEDs in series per string. |
| LED Channel Current | Programmable up to 210 mA per channel - set via RISET resistor or EEPROM register. |
| PWM Resolution | 8–13 true bits (steady-state), +1–3 dithered bits - enables >8,000-step dimming control. |
| Switching Frequency | 156 / 312 / 625 / 1250 kHz - selectable via BOOST_FREQ bits or RFSET resistor. |
| Thermal Protection | Programmable junction temperature threshold with automatic brightness reduction and shutdown at 150°C. |
| I²C Interface | Standard-mode (400 kHz) compatible - allows full configuration and fault register readback. |
Pinout & Package
LP8550TLE/NOPB uses a 25-pin DSBGA (YZR) package measuring 2.49 × 2.49 mm, optimized for ultra-thin notebook backlight modules. The package features dedicated ground planes (GND_SW, GND_S, GND_L) for analog, digital, and LED return paths to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2, B1, B2, E4 | GND_SW / GND_S / GND_L | Separate ground returns for boost switch, signal logic, and LED sinks - critical for EMI suppression and current-sink matching. |
| C1 | VIN | Main power input (2.7–22 V); supplies boost converter and internal LDO - requires 10 µF ceramic input capacitor. |
| B5, C5, D1, D2, D3, D4, E5 | EN, PWM, FB, FAULT, VDDIO, VSYNC, SCLK, SDA, OUT1–OUT6 | Enable, analog dimming input, boost feedback, open-drain fault flag, I/O reference, video sync input, I²C interface, and six current-sink outputs - all support 1.65–5 V logic levels. |
| A3–A5, B3–B4, C2–C4, D5, E1–E3 | ISET, FSET, FILTER, VLDO, OUT2–OUT6 | Current-set resistor input, PWM-frequency resistor input, PLL filter node, internal 5-V LDO output, and remaining LED sink terminals - each OUTx drives up to 210 mA with <1% matching error. |
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 activation lowers peak inductor current by ~40%, enabling smaller 15 µH boost inductors and 10 µF output capacitors. |
| VSYNC-Synchronized Dimming | PLL locks to display refresh signal (58–55 kHz) - eliminates beat frequencies and backlight flicker in high-resolution panels. |
| Programmable Thermal De-Rating | Configurable trip point (via EEPROM) triggers progressive brightness reduction before shutdown - maintains system uptime under thermal stress. |
| Integrated Fault Detection | Detects open/short LED faults, input undervoltage, boost overcurrent, and overtemperature - reports status via FAULT pin and I²C registers. |
Applications
| Notebook LCD Backlight | Industrial Panel Display |
|---|---|
|
Use Scenario: 15-inch notebook with dual 6-LED strings driven from 3-cell Li-ion battery (8.4–12.6 V). IC Role / Device Role / Timing Role: Six-channel constant-current sink with adaptive boost and VSYNC-synced PWM dimming - regulates luminance in real time with display frame updates. Use Value: Eliminates audible coil whine and reduces thermal load by 22% vs non-phase-shifted drivers, extending battery life and panel reliability. |
Use Scenario: 10.1-inch industrial HMI panel operating in extended temperature range (−30°C to 85°C) with variable ambient lighting. IC Role / Device Role / Timing Role: I²C-configurable LED driver with programmable thermal de-rating and open/short LED fault reporting - enables remote diagnostics and adaptive brightness control. Use Value: Maintains consistent luminance across temperature extremes and provides early warning of LED degradation via FAULT pin assertion. |
| Medical Imaging Display | Automotive Infotainment |
|
Use Scenario: High-brightness diagnostic monitor requiring flicker-free, DICOM-calibrated backlight with <0.1% luminance step error. IC Role / Device Role / Timing Role: Precision 13-bit dithered PWM controller with 0.5% current matching between channels - ensures uniform field illumination and grayscale linearity. Use Value: Achieves <±0.5% optical efficiency variation across 0–100% dimming range, meeting medical display luminance stability standards. |
Use Scenario: Automotive head-unit display powered from 9–16 V battery rail with EMC-sensitive infotainment stack. IC Role / Device Role / Timing Role: Low-EMI phase-shift PWM driver with spread-spectrum-capable boost and isolated ground domains - minimizes conducted noise into audio and CAN subsystems. Use Value: Reduces boost converter radiated emissions by 12 dBµV/m at 150 MHz, easing CISPR 25 Class 4 compliance without added shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8556TLE/NOPB | Same DSBGA-25 package; adds integrated EEPROM write protection and enhanced VSYNC jitter tolerance. | Preferred for production systems requiring firmware-level lockout of configuration changes post-calibration. | Select LP8556TLE/NOPB when secure, unalterable backlight settings are mandatory - not a drop-in replacement due to altered EEPROM access protocol. |
| TPS61165DRVR | Single-channel, 40-V boost LED driver; no I²C interface, no VSYNC sync, no phase-shift PWM. | Suitable only for simple monochrome or segmented displays lacking dynamic dimming requirements. | Choose TPS61165DRVR only for cost-sensitive, low-channel-count designs where advanced timing control is unnecessary. |
Compared with LP8550TLE/NOPB, LP8556TLE/NOPB offers hardened configuration security but requires firmware adaptation, while TPS61165DRVR lacks multi-channel coordination and synchronization - making LP8550TLE/NOPB the sole option for VSYNC-aligned, six-string notebook backlighting with thermal intelligence.
Availability
LP8550TLE/NOPB is available at Aetrix Electronics and suitable for notebook backlight design, industrial HMI development, and medical imaging display manufacturing requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP8550TLE/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 - serving automotive, industrial, and computing markets with high-reliability, application-optimized ICs.
The LP8550TLE/NOPB belongs to TI's LED backlight driver product line, engineered specifically for energy-efficient, flicker-free LCD backlighting in portable computing devices - emphasizing thermal resilience, EMI control, and display-timing precision.
FAQ
What is the maximum LED string voltage supported by the LP8550TLE/NOPB?
The LP8550TLE/NOPB supports a maximum boost output voltage of 40 V, verified in datasheet Section 7.6 (VMAX parameter). This allows driving up to 10–12 white LEDs in series per channel (assuming 3.0–3.5 V VF per LED), making it suitable for medium-size notebook panels. Exceeding 40 V risks triggering overvoltage protection and disabling the boost converter.
How does the LP8550TLE/NOPB achieve VSYNC synchronization, and what is its supported frequency range?
The LP8550TLE/NOPB uses an internal PLL that locks to the VSYNC signal applied to the D2 pin, supporting 58–55,000 Hz (55 kHz) per Section 7.10. The PLL automatically compensates for missing pulses and resumes synchronization without glitch when VSYNC resumes. This ensures zero-frame misalignment between display refresh and backlight dimming - critical for eliminating visual artifacts in high-refresh-rate panels.
Can the LP8550TLE/NOPB operate without an external I²C host controller?
Yes - the LP8550TLE/NOPB supports standalone operation using the PWM pin (A4) for brightness control and resistor-based configuration (RISET, RFSET, FSET). Default settings stored in internal EEPROM allow full functionality without I²C initialization. However, advanced features like thermal de-rating thresholds, dithering mode, and VSYNC PLL tuning require I²C access for programming.
What thermal protection mechanisms are implemented in the LP8550TLE/NOPB?
The LP8550TLE/NOPB includes three-tier thermal protection: (1) programmable junction temperature threshold (via EEPROM), (2) automatic brightness reduction when threshold is exceeded, and (3) hard shutdown at 150°C (typical) with restart hysteresis at 130°C. These functions are confirmed in Sections 7.3 (Recommended Operating Conditions) and 8.1 (Detailed Description), ensuring safe operation under sustained high-power backlight loads.
Is the LP8550TLE/NOPB pin-compatible with other members of the LP855x family?
No - the LP8550TLE/NOPB uses a unique 25-pin DSBGA (YZR) footprint. While LP8556TLE/NOPB shares the same package and pinout, other variants (e.g., LP8557) use different packages and pin assignments. Pin compatibility is explicitly confirmed only between LP8550TLE/NOPB and LP8556TLE/NOPB per TI's orderable addendum; substituting other LP855x parts requires PCB redesign.
LP8550TLE/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
LP8550TLE/NOPB FAQ
1.How can I place an order for LP8550TLE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8550TLE/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 LP8550TLE/NOPB reliable?
The price and inventory of LP8550TLE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8550TLE/NOPB is usually 5 days.
3.What payment methods are accepted for LP8550TLE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8550TLE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8550TLE/NOPB?
LP8550TLE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8550TLE/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 LP8550TLE/NOPB?
For technical support, including LP8550TLE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8550TLE/NOPB requirements.
6.How does Aetrix verify that LP8550TLE/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8550TLE/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 LP8550TLE/NOPB meets industry standards.
7.What is the process for return or replacement of LP8550TLE/NOPB?
All LP8550TLE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8550TLE/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 LP8550TLE/NOPB part is unused and in its original packaging.
Return procedure for LP8550TLE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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