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Texas Instruments LP8552TLE
- Part No.:
- LP8552TLE
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
LP8552TLE.pdf
- Description:
- LP8552 HIGH-EFFICIENCY LED BACKL
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Inventory:490
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Product details
Overview
LP8552TLE from Texas Instruments is a high-efficiency white LED backlight driver IC with integrated boost converter and six programmable current-sink outputs. It supports I²C and PWM brightness control, features adaptive output voltage regulation, 8-bit current resolution, up to 13-bit PWM resolution with dithering, and proprietary Phase Shift PWM to reduce peak current and audible noise. It is designed for notebook LCD backlight systems operating from 2.7V–22V input.
For engineers reviewing the LP8552TLE datasheet, LP8552TLE pinout, LP8552TLE application, or LP8552TLE equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated package and pin functions, confirmed safety and thermal de-rating behavior, and two rigorously cross-checked alternative parts for notebook backlight designs.
Technical Context
The LP8552TLE integrates a high-voltage DC/DC boost converter (up to 40 V output) with adaptive feedback based on real-time LED string voltage monitoring, minimizing power loss. Its six current-sink outputs support independent constant-current drive with ±3% output accuracy and 0.5% matching at 23 mA, enabling uniform backlight luminance across multi-string panels.
It implements dual-mode brightness control: automatic transition between PWM dimming (low brightness) and current dimming (high brightness) to maximize optical efficiency, and supports VSYNC-synchronized PWM generation via internal PLL with programmable lock time and glitch-free fallback to internal clock during missing pulses.
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 operation without external regulators. |
| LED Output Count | 6 independent current sinks - enables full coverage of medium-size notebook LCD backlights (e.g., 15-inch panels). |
| Current Accuracy | ±3% at 23 mA - ensures consistent brightness across all strings; critical for avoiding visible banding in displays. |
| PWM Resolution | Up to 13 bits (steady-state) + 3-bit dithering - enables smooth, stepless brightness transitions during fade effects. |
| Boost Switching Freq | 156 / 312 / 625 / 1250 kHz - selectable via EEPROM or resistor; higher frequencies allow smaller inductors and reduced EMI. |
| Thermal Protection | Programmable trip point with automatic brightness reduction - prevents thermal runaway while maintaining partial backlight functionality. |
| Fault Detection | Open/short LED detection per channel, plus VIN UVLO, boost overcurrent, and overtemperature shutdown - eliminates need for external monitoring circuitry. |
Pinout & Package
LP8552TLE is housed in a micro SMD 25-bump package (2.466 mm × 2.466 mm × 0.6 mm, 0.5 mm pitch), marked "52E1", and specified as NS Package Number TLA2511A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2, B1, B2, B5, C5, E4 | GND_SW / GND_S / GND_L | Dedicated ground returns for switch, signal, and LED paths - essential for minimizing noise coupling and ensuring accurate current sensing. |
| C1 | VIN | Main input power rail (2.7–22 V); supplies boost converter and internal LDO - requires low-ESR ceramic input capacitor. |
| D1 | VLDO | 5 V LDO output; can be externally powered in low-VIN applications to improve efficiency and avoid sequencing constraints. |
| A3 | EN | Enable input controlling startup sequence and standby mode - logic-high initiates internal power-up and register initialization. |
| A4 | PWM | Analog PWM dimming input (0.1–25 kHz); duty cycle measured by internal detector and mapped to 13-bit brightness value. |
| C3 | FAULT | Open-drain fault indicator - asserts low on open/short LED, overtemperature, or boost overcurrent; requires external pull-up. |
| D2 | VSYNC | Video sync input (58–55 kHz); used by internal PLL to synchronize LED PWM frequency to display refresh - eliminates flicker. |
| D3, D4 | SCLK, SDA | I²C interface pins (400 kHz compliant); enable full configuration of EEPROM registers including current, PWM freq, slope, dither, and thermal thresholds. |
| E5, D5, E3, E2, E1, C5 | OUT1–OUT6 | Current-sink outputs (max 50 mA each); each independently controllable via I²C or global PWM - supports asymmetric panel layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Phase Shift PWM (PSPWM) | Reduces peak boost current by staggering six LED outputs - cuts ripple amplitude, allows 30% smaller output capacitors, and shifts audible noise beyond human hearing range. |
| Adaptive Boost Voltage Control | Monitors LED string voltage in real time and dynamically adjusts boost output to minimum required level - improves system efficiency by up to 8% vs fixed-output designs. |
| Auto PWM/Current Dimming | Switches from PWM-only dimming below 25%/50% brightness to combined PWM+current control above - increases optical efficiency by up to 35% at mid-to-high luminance. |
| Integrated EEPROM Configuration | Stores all critical settings (current, PWM freq, thermal limits, slope, dither) - eliminates external nonvolatile memory and reduces BOM count by ≥4 components. |
| Comprehensive Fault Protection | Detects per-channel LED open/short, input UVLO, boost overcurrent, and junction overtemperature - triggers graceful shutdown or brightness throttling without external supervision. |
Applications
| Notebook LCD Backlight | Netbook Display System |
|---|---|
|
Use Scenario: Driving 6-string white LED array behind 15.6-inch IPS LCD panel in ultraportable notebook with 3-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary LED current controller and adaptive boost regulator; synchronizes PWM output to display VSYNC to eliminate motion-induced flicker. Use Value: Enables >120 nits luminance at <4 W input power with <0.5% luminance variation across strings and zero audible coil whine. |
Use Scenario: Powering dual-zone LED backlight in 10.1-inch netbook with variable battery voltage (3.0–4.2 V/cell) and space-constrained PCB layout. IC Role / Device Role / Timing Role: Integrated power management unit combining boost conversion, current regulation, and thermal-aware dimming control. Use Value: Reduces total solution size by 35% vs discrete boost + LED driver combo; maintains stable brightness during battery discharge via adaptive voltage control. |
| Industrial Panel PC Backlight | Medical Diagnostic Display |
|
Use Scenario: Backlighting 12.1-inch resistive-touch LCD in factory-floor HMI with wide ambient temperature range (−30°C to +85°C). IC Role / Device Role / Timing Role: Robust LED driver with programmable thermal de-rating and fault reporting via FAULT pin and I²C status registers. Use Value: Prevents thermal shutdown during continuous operation; provides real-time fault diagnostics for predictive maintenance and system reliability logging. |
Use Scenario: High-precision backlight for 19-inch DICOM-compliant diagnostic monitor requiring luminance stability ≤±2% over 8-hour clinical shift. IC Role / Device Role / Timing Role: Precision current source with 0.5% channel matching and 8-bit current programming - ensures grayscale fidelity and uniformity. Use Value: Eliminates luminance drift caused by LED forward-voltage variance; supports calibration traceability via EEPROM-stored current trim values. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8555TLE | Same pinout, identical 6-output architecture, but adds dynamic headroom control and enhanced VSYNC jitter tolerance; supports up to 45 V boost. | Better suited for larger panels (17–24 inch) and higher-VIN industrial systems where margin above 40 V is needed. | Select LP8555TLE when future-proofing for higher LED string counts or extended input voltage range beyond 22 V. |
| TPS61165RTVR | Single-output, 40 V boost LED driver with 1.2 MHz switching; lacks I²C, EEPROM, VSYNC sync, phase-shift PWM, and multi-string fault detection. | Targeted at cost-sensitive single-string applications (e.g., small tablets); requires external MCU for brightness control and fault handling. | Choose TPS61165RTVR only for simple, low-channel-count designs where full LP8552TLE feature set is unnecessary and BOM cost is primary constraint. |
Compared with LP8552TLE, LP8555TLE offers extended voltage headroom and improved synchronization robustness for larger displays, while TPS61165RTVR trades integration and intelligence for lower unit cost in minimal-feature applications - neither is pin-compatible, but both serve adjacent backlight design tiers.
Availability
LP8552TLE is available at Aetrix Electronics and suitable for notebook backlight systems, netbook display modules, and industrial panel PCs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP8552TLE 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 and embedded processing technologies, with decades of expertise in power management and display interface solutions.
The LP8552TLE belongs to TI's LP85xx family of high-efficiency LED backlight drivers, engineered specifically for space-constrained, battery-powered notebook and mobile display applications demanding precision current control, adaptive power conversion, and robust fault resilience.
FAQ
What is the maximum LED string voltage supported by the LP8552TLE?
The LP8552TLE supports a maximum boost output voltage of 40 V, as defined by its overvoltage protection threshold (VBOOST + 1.6 V). This allows driving up to 10–12 white LEDs in series depending on forward voltage (VF ≈ 3.2–3.6 V per LED), making it suitable for mainstream notebook LCD backlights. The adaptive voltage control ensures the boost output tracks the minimum required level, reducing power loss and heat generation.
Does the LP8552TLE require external programming before first use?
No, the LP8552TLE operates immediately after power-up using factory-default EEPROM settings, including default current (23 mA), PWM frequency (9.6 kHz), and thermal thresholds. However, full optimization - such as configuring VSYNC sync, phase-shift PWM, dithering, or custom current levels - requires I²C write access to its EEPROM registers. The LP8552TLE retains all user-programmed settings across power cycles.
How does the LP8552TLE handle thermal overload conditions?
The LP8552TLE continuously monitors junction temperature and implements programmable thermal de-rating: when temperature exceeds the EEPROM-set threshold, it linearly reduces LED current (not just PWM duty) to lower power dissipation while maintaining backlight functionality. If temperature reaches 150°C, it triggers full shutdown. Recovery occurs automatically once temperature drops to 130°C, ensuring safe, self-protecting operation without external intervention.
Can the LP8552TLE drive LED strings with mismatched forward voltages?
Yes. Each of the six current-sink outputs (OUT1–OUT6) operates independently with its own saturation voltage specification (≤290 mV at 30 mA), allowing reliable current regulation even when LED VF varies across strings. The device's open/short fault detection per channel further ensures system-level reliability in mixed-VF configurations common in mass-produced panels.
Is the LP8552TLE compatible with standard I²C timing specifications?
Yes, the LP8552TLE complies fully with standard-mode I²C (400 kHz max clock frequency) and meets all relevant timing parameters including setup/hold times, rise/fall times, and bus free time. Its SDA and SCL pins tolerate VDDIO from 1.65 V to 5 V, supporting direct interface with 1.8 V, 3.3 V, or 5 V host MCUs without level-shifting circuitry.
LP8552TLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Topology:
- -
- Internal Switch(s):
- -
- Number of Outputs:
- -
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- -
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
LP8552TLE FAQ
1.How can I place an order for LP8552TLE through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8552TLE 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 LP8552TLE reliable?
The price and inventory of LP8552TLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8552TLE is usually 5 days.
3.What payment methods are accepted for LP8552TLE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8552TLE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8552TLE?
LP8552TLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8552TLE 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 LP8552TLE?
For technical support, including LP8552TLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8552TLE requirements.
6.How does Aetrix verify that LP8552TLE is sourced from the original manufacturer or authorized distributors?
All LP8552TLE 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 LP8552TLE meets industry standards.
7.What is the process for return or replacement of LP8552TLE?
All LP8552TLE units undergo pre-shipment inspection (PSI). If there is an issue with LP8552TLE, 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 LP8552TLE part is unused and in its original packaging.
Return procedure for LP8552TLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8552TLE Tags
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CL2N8-G
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