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Texas Instruments LP8553TLX/NOPB
- Part No.:
- LP8553TLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 25-WFBGA, DSBGA
- Datasheet:
-
LP8553TLX/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 25DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8553TLX/NOPB from Texas Instruments is a high-efficiency, four-channel white LED backlight driver IC with integrated 40V boost converter, programmable I²C/PWM brightness control, and adaptive output-voltage regulation for notebook LCD displays. It delivers up to 210 mA per channel (±400 mA total), supports 156–1250 kHz switching frequencies, and operates from 5.5V to 22V input. Used in 15-inch notebook panels with 23 mA per string.
For engineers reviewing the LP8553TLX/NOPB datasheet, LP8553TLX/NOPB pinout, LP8553TLX/NOPB application, or LP8553TLX/NOPB equivalent, key selection criteria include boost output voltage headroom (up to 40 V), phase-shift PWM for audible-noise reduction, VSYNC synchronization capability, thermal de-rating behavior, and EEPROM-configurable current dimming thresholds.
Technical Context
The LP8553TLX/NOPB integrates a current-mode DC/DC boost controller with adaptive feedback based on real-time LED string voltage monitoring, minimizing power loss by dynamically adjusting VOUT to the lowest sufficient level. Its internal 5 MHz oscillator feeds a programmable PLL that enables VSYNC-synchronized PWM generation (58–55 kHz) or fixed-frequency operation up to 40 MHz.
Four independent 8-bit current sinks (OUT1–OUT4) support both PWM-only and hybrid PWM+current dimming modes, with dithering extending effective resolution to 13 bits. Fault protection includes open/short LED detection, over-temperature shutdown (150°C trip), input UVLO (configurable 2.7–9.2 V), and boost over-current limiting (1.4–2.5 A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5 V to 22 V - supports single-to-5-cell Li-ion battery inputs without external LDO pre-regulation. |
| Boost Output Voltage | Up to 40 V - sufficient for driving 10+ white LEDs in series at typical forward voltages (~3.2 V each). |
| LED Channel Current | 0–210 mA per channel (±400 mA total) - set via RISET resistor or EEPROM; ±3% accuracy at 23 mA. |
| PWM Resolution | 8–13 bits (steady-state) + 1–3-bit dithering - enables smooth luminance transitions without visible stepping. |
| Switching Frequency | 156 / 312 / 625 / 1250 kHz - selectable via BOOST_FREQ bits; higher frequencies reduce inductor size but increase switching loss. |
| VSYNC Sync Range | 58–55,000 Hz - locks internal PLL to display timing signals to eliminate flicker and beat interference. |
| Thermal Shutdown | 150°C (engage), 130°C (release) - protects silicon during sustained high-power backlight operation. |
Pinout & Package
LP8553TLX/NOPB uses TI's DSBGA-25 package (YZR002511A), 2.466 mm × 2.466 mm × 0.6 mm, with 25 bumps arranged in 5×5 array. Exposed die pad enhances thermal performance. Pin mapping validated per SNVS701B Rev. January 2014.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2, B1, B2 | GND_SW / SW | Boost switch ground and high-side switch nodes - require low-inductance layout to minimize EMI and voltage spikes. |
| A3 | EN | Active-high enable - must be pulled high to activate internal LDO and boost; logic threshold 1.2 V min. |
| A4 | PWM | Analog PWM dimming input - accepts 0.1–25 kHz signal; duty cycle measured with 13-bit resolution. |
| A5 | FB | Boost feedback - monitors output voltage to regulate VOUT; requires resistive divider to GND. |
| B3 | ISET | Current sink reference - sets LED current via external RISET resistor (e.g., 16 kΩ = 23 mA). |
| B4 | FSET | PWM frequency reference - configures PLL clock via RFSET resistor (e.g., 120 kΩ ≈ 5 MHz). |
| C1 | VIN | Main power input - rated for 24 V absolute max; supplies boost stage and internal LDO. |
| C3 | FAULT | Open-drain fault indicator - asserts low on LED open/short, over-temp, or boost over-current. |
| C4 | VDDIO | Digital I/O supply - powers I²C interface and PWM input; accepts 1.65–5 V (not tied to VIN). |
| D1 | VLDO | Internal 5 V LDO output - can power external circuitry or serve as alternate VIN source in low-battery apps. |
| D2 | VSYNC | Video sync input - synchronizes PWM output to display refresh; 58–55 kHz range with automatic re-lock. |
| D3, D4 | SCLK, SDA | I²C interface - supports standard/fast-mode (400 kHz); VDDIO-referenced logic levels (0.2×/0.8×). |
| C5, D5, E3, E5 | OUT1–OUT4 | Constant-current LED sinks - each drives one string; saturation voltage ≤290 mV at 30 mA. |
| E4 | GND_L | LED return path - separate ground improves current matching and reduces noise coupling into analog paths. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Voltage Control | Reduces power loss by dynamically lowering VOUT to minimum required for LED string conduction - improves efficiency up to 10% vs fixed-output designs. |
| Phase-Shift PWM Modulation | Staggered turn-on of OUT1–OUT4 reduces peak input current by >30%, enabling smaller input capacitors and eliminating audible coil whine. |
| VSYNC-Synchronized PWM | Eliminates display flicker and beat patterns by locking LED dimming frequency precisely to video frame rate - critical for high-refresh-rate panels. |
| Hybrid PWM + Current Dimming | Automatically switches from PWM-only (low brightness) to combined PWM+current (high brightness) to maximize optical efficiency across full luminance range. |
| EEPROM Configuration Storage | Retains user settings (current, frequency, thermal limits, slope time) across power cycles - eliminates need for host MCU initialization sequence. |
Applications
| Notebook LCD Backlight | Industrial Panel Display |
|---|---|
|
Use Scenario: 15-inch notebook with dual 10-LED strings driven from 3S Li-ion battery (9–12.6 V). IC Role / Device Role / Timing Role: Primary LED driver controlling brightness, fault response, and thermal management; synchronized to 60 Hz VSYNC. Use Value: Achieves >90% efficiency at 150 mA/string while suppressing audible noise and enabling smooth 0–100% dimming with <1% luminance step error. |
Use Scenario: 12.1-inch industrial HMI panel operating in −30°C to +85°C ambient with 24 V DC input. IC Role / Device Role / Timing Role: Constant-current LED driver with over-temperature derating and open-circuit fault reporting via FAULT pin. Use Value: Maintains stable backlight luminance despite wide temperature swings; thermal shutdown prevents LED degradation under prolonged high-brightness use. |
| Medical Diagnostic Monitor | Automotive Infotainment Display |
|
Use Scenario: High-contrast 19-inch diagnostic monitor requiring flicker-free imaging and precise grayscale reproduction. IC Role / Device Role / Timing Role: Precision LED driver with 13-bit PWM resolution and dithering for artifact-free grayscale ramping. Use Value: Enables 10-bit+ effective luminance control without visible banding; VSYNC sync ensures zero temporal misalignment with image data. |
Use Scenario: 10.25-inch automotive cluster display powered from 9–16 V vehicle battery with EMC constraints. IC Role / Device Role / Timing Role: Robust LED driver with UVLO hysteresis, ESD-hardened I/O, and phase-shift PWM to meet CISPR-25 Class 5 emissions. Use Value: Meets automotive reliability requirements with no external surge protection needed; fault reporting enables ASIL-B-compatible diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409QMY/NOPB | External MOSFET controller (no integrated FET); requires external boost switch and gate driver; no I²C interface or VSYNC sync. | Targeted at high-power (>1 A) industrial LED drivers where thermal design flexibility outweighs integration benefits. | Choose when board space allows discrete FET placement and system-level thermal management is preferred over monolithic integration. |
| TPS61165DRVR | Single-channel, 40 V boost LED driver; no EEPROM, no VSYNC sync, no phase-shift PWM; max 1.2 A total output. | Designed for cost-sensitive portable displays (tablets, e-readers) with simpler brightness control and lower channel count. | Choose for single-string applications where I²C configuration and multi-channel matching are unnecessary. |
Compared with LM3409QMY/NOPB and TPS61165DRVR, LP8553TLX/NOPB uniquely combines four matched current sinks, VSYNC synchronization, EEPROM storage, and phase-shift PWM in a 2.5 mm² package-enabling compact, flicker-free, thermally robust notebook backlight solutions without external timing or fault-handling logic.
Availability
LP8553TLX/NOPB is available at Aetrix Electronics and suitable for notebook backlight systems, industrial HMI panels, medical diagnostic monitors, and automotive infotainment displays requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LP8553TLX/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 over 50 years of innovation in high-reliability power conversion and signal chain solutions.
LP8553TLX/NOPB belongs to TI's LED backlight driver product line, engineered specifically for energy-efficient, flicker-free LCD backlighting in portable computing and professional display applications where thermal management, EMI control, and precise luminance control are critical.
FAQ
What is the maximum LED string voltage supported by the LP8553TLX/NOPB?
The LP8553TLX/NOPB supports a maximum boost output voltage of 40 V, verified per Absolute Maximum Ratings (VOUT = 40 V). This enables driving up to 12 white LEDs in series (assuming 3.2 V forward voltage each) while maintaining margin for temperature drift and ripple. The adaptive feedback loop continuously adjusts VOUT to the minimum required level, improving efficiency.
Does the LP8553TLX/NOPB support I²C communication, and what are its voltage requirements?
Yes, the LP8553TLX/NOPB supports standard- and fast-mode I²C (up to 400 kHz) via SCLK and SDA pins. These pins operate referenced to VDDIO, which must be supplied externally in the 1.65 V to 5 V range. Logic thresholds are 0.2×VDDIO (low) and 0.8×VDDIO (high), allowing direct interfacing with 1.8 V, 2.8 V, or 3.3 V microcontrollers without level shifters.
How does the LP8553TLX/NOPB handle thermal overload conditions?
The LP8553TLX/NOPB incorporates a thermal shutdown circuit that disables the boost converter and LED outputs when junction temperature reaches 150°C (typical), re-enabling operation only after cooling to 130°C. Additionally, it features programmable thermal de-rating: when temperature approaches the EEPROM-set limit, brightness is gradually reduced to maintain safe operation without abrupt shutdown.
Can the LP8553TLX/NOPB synchronize its PWM output to an external VSYNC signal, and what frequency range is supported?
Yes, the LP8553TLX/NOPB includes a dedicated VSYNC pin (D2) and internal PLL that locks to external sync signals from 58 Hz to 55 kHz. This ensures pixel-perfect alignment between backlight dimming and display frame updates, eliminating flicker and beat artifacts. The PLL maintains lock even during brief VSYNC dropouts using internal pulse generation.
What external components are required for basic LP8553TLX/NOPB operation?
Minimum external components for LP8553TLX/NOPB include: one 15 μH boost inductor (L1), one Schottky diode (D1), input capacitor (CIN ≥ 10 μF), output capacitor (COUT ≥ 10 μF), current-setting resistor (RISET), PWM frequency resistor (RFSET), and VLDO bypass capacitor (CVLDO = 1 μF). Optional components include FILTER (100 nF) for PLL stability and VSYNC pull-down.
LP8553TLX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 25-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 22V
- Voltage - Output:
- 40V
- Current - Output / Channel:
- 450mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-DSBGA
LP8553TLX/NOPB FAQ
1.How can I place an order for LP8553TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8553TLX/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 LP8553TLX/NOPB reliable?
The price and inventory of LP8553TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8553TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LP8553TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8553TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8553TLX/NOPB?
LP8553TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8553TLX/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 LP8553TLX/NOPB?
For technical support, including LP8553TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8553TLX/NOPB requirements.
6.How does Aetrix verify that LP8553TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8553TLX/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 LP8553TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LP8553TLX/NOPB?
All LP8553TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8553TLX/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 LP8553TLX/NOPB part is unused and in its original packaging.
Return procedure for LP8553TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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