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Texas Instruments LP8551TLE/NOPB
- Part No.:
- LP8551TLE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 25-WFBGA, DSBGA
- Datasheet:
-
LP8551TLE/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 25DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:680
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Product details
Overview
LP8551TLE/NOPB from Texas Instruments is a high-voltage LED backlight driver IC with integrated 40-V boost converter, four programmable current-sink outputs (OUT1–OUT4), adaptive output voltage control, and dual brightness control via I²C or PWM input. It delivers up to 50 mA per channel with ±3% current accuracy and supports notebook LCD backlighting with thermal de-rating and open/short LED fault detection.
For engineers reviewing the LP8551TLE/NOPB datasheet, LP8551TLE/NOPB pinout, LP8551TLE/NOPB application, or LP8551TLE/NOPB equivalent, key selection considerations include its 2.7–22 V input range, 156–1250 kHz selectable boost switching frequency, 8–13-bit PWM resolution, integrated EEPROM for configuration storage, and DSBGA-25 package with 2.49 mm × 2.49 mm footprint.
Technical Context
The LP8551TLE/NOPB integrates a high-efficiency DC/DC boost converter with adaptive output voltage regulation-monitored in real time via FB and OUTx voltage feedback-to minimize power loss across varying LED forward voltages. Its four current sinks support independent dimming with phase-shifted PWM to reduce peak inductor current and audible noise.
Internal 5-MHz oscillator and programmable PLL (5–40 MHz) enable configurable PWM resolution (8–13 bits) and frequency (600 Hz–19.2 kHz), while EEPROM stores settings for current level, temperature thresholds, slope timing, and fault response behavior-eliminating external configuration components.
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 LDO pre-regulation. |
| Boost Output Voltage | Up to 40 V - sufficient for driving 10+ white LEDs in series at typical VF (~3.2 V). |
| LED Current Accuracy | ±3% (typ.) - ensures consistent brightness across channels and temperature (–30°C to 85°C). |
| PWM Resolution | 8–13 bits - enables smooth, flicker-free dimming down to 0.012% duty cycle (13-bit @ 20 kHz). |
| Switching Frequency | 156 / 312 / 625 / 1250 kHz - higher frequencies allow smaller inductors (e.g., 15 µH) and reduced EMI filtering. |
| Thermal Protection | Programmable trip point with automatic brightness reduction - prevents thermal runaway without system shutdown. |
| Fault Detection | Open/short LED, overcurrent, UVLO, overtemperature - reported via FAULT pin and I²C status register. |
Pinout & Package
LP8551TLE/NOPB uses a 25-pin DSBGA (YZR) package with 0.4-mm pitch and 2.49 mm × 2.49 mm body size. Thermal performance is optimized via exposed die pad connected to GND_L and GND_SW pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2, B1, B2, D2, E4 | GND_SW / GND / GND_L | Dedicated ground paths isolate boost switch return (GND_SW), signal reference (GND), and LED sink return (GND_L) to minimize noise coupling. |
| C1 | VIN | Main power input (2.7–22 V); supplies boost stage and internal LDO when VBATT ≥ 5.5 V. |
| D1 | VLDO | 5-V LDO output; can be externally powered in low-VIN applications (e.g., 3-V battery) to maintain digital logic operation. |
| A3 | EN | Active-high enable; controls full device startup/shutdown with 6-ms turn-on delay and 50-ms turn-off delay. |
| A4 | PWM | Analog dimming input; accepts 0.1–25 kHz PWM signal with 1–13-bit resolution depending on PLL clock and input frequency. |
| B3 | ISET | Current-setting node; connects to RISET resistor (e.g., 16 kΩ → 23 mA max) or floats for EEPROM-only current control. |
| B4 | FSET | PWM frequency-setting node; connects to RFSET resistor to select one of four fixed frequencies (156/312/625/1250 kHz). |
| C3 | FAULT | Open-drain fault indicator; asserts low on LED open/short, overtemperature, or boost overcurrent events. |
| C4 | VDDIO | Digital I/O reference (1.65–5 V); powers I²C interface and sets logic thresholds for SCLK/SDA. |
| D3, D4 | SCLK, SDA | I²C bus interface (400 kHz compliant); supports brightness, current, and configuration register access without PWM pin dependency. |
| E5, D5, C5, E3 | OUT1–OUT4 | Four independent constant-current sinks; each delivers up to 50 mA with <1% matching and <105 mV saturation voltage @ 20 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Voltage Control | Real-time FB monitoring dynamically adjusts VBOOST to minimum required level-reducing power loss by up to 30% vs. fixed-output designs. |
| Phase-Shift PWM (PSPWM) | Delays individual OUTx PWM edges to spread current demand across switching cycle-cutting peak inductor current and enabling smaller 15-µH inductors. |
| Integrated EEPROM Configuration | Stores 8+ user-defined parameters (current, PWM freq, temp threshold, slope time) - eliminates boot-time I²C initialization and supports standalone operation. |
| Thermal De-Rating with Hysteresis | Reduces LED current linearly above programmable TJ threshold (e.g., 110°C); resumes full brightness only after 20°C hysteresis to prevent oscillation. |
| Multi-Mode Brightness Control | Supports three mutually exclusive methods: PWM pin duty-cycle tracking, I²C register write, or direct PWM pass-through-enabling flexible system-level integration. |
Applications
| Notebook LCD Backlight | Tablet Display Driver |
|---|---|
|
Use Scenario: Driving 4-string WLED array (e.g., 8 LEDs/string @ 3.2 V) in 13.3″ notebook with 3-cell Li-ion battery (8.4–12.6 V). IC Role / Device Role / Timing Role: Primary LED current controller and boost regulator; manages adaptive VBOOST, thermal foldback, and I²C-configured dimming curves. Use Value: Enables >90% efficiency across battery discharge curve while maintaining <1% current matching and eliminating audible coil whine via PSPWM. |
Use Scenario: Powering dual-zone edge-lit display in 10.1″ Android tablet with dynamic local dimming via independent OUT1–OUT4 control. IC Role / Device Role / Timing Role: Four-channel synchronized current sink with programmable PWM phase offset and 13-bit resolution for fine-grained zone brightness control. Use Value: Supports 2000:1 contrast ratio through precise per-zone current scaling and fast (<6 ms) brightness transitions using EEPROM-stored slope profiles. |
| Industrial Panel Display | Medical Imaging Monitor |
|
Use Scenario: Backlighting 15″ ruggedized HMI panel operating in –30°C to 70°C ambient with wide-input 9–36 V DC supply. IC Role / Device Role / Timing Role: High-reliability LED driver with UVLO lockout (configurable 2.7–9.2 V thresholds), open/short LED fault reporting, and thermal shutdown at 150°C. Use Value: Ensures continuous operation under voltage transients and thermal stress-fault status communicated via FAULT pin and I²C for predictive maintenance logging. |
Use Scenario: DICOM-compliant diagnostic monitor requiring stable luminance (±0.5%) and zero flicker across 0.1–100% brightness range. IC Role / Device Role / Timing Role: Precision current source with ±3% matching, 13-bit PWM resolution, and programmable gamma correction via EEPROM brightness registers. Use Value: Meets IEC 62304 Class C software requirements by storing calibration data in nonvolatile memory-no host MCU dependency for luminance stability. |
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; no integrated EEPROM, no phase-shift PWM, no thermal de-rating. | Limited to simpler single-string applications; requires external MCU for brightness sequencing and fault handling. | Choose when cost sensitivity outweighs multi-string flexibility and autonomous thermal management. |
| LM3409QMYX/NOPB | Controller-only (external MOSFET); supports higher currents (>1 A) but lacks current sinks, I²C, or integrated fault logic. | Targeted at high-power automotive or signage lighting-not optimized for compact, low-noise notebook backlighting. | Prefer for custom high-efficiency designs where board space allows discrete FET layout and firmware handles all protection logic. |
Compared with TPS61165DRVR and LM3409QMYX/NOPB, the LP8551TLE/NOPB uniquely integrates four matched current sinks, adaptive boost control, EEPROM-based configuration, and autonomous thermal management-reducing BOM count by 7+ components and eliminating host MCU intervention for basic backlight operation.
Availability
LP8551TLE/NOPB is available at Aetrix Electronics and suitable for notebook backlighting, industrial HMI panels, medical imaging displays, and ruggedized tablet applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP8551TLE/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 90 years of innovation in high-reliability electronic systems.
The LP8551TLE/NOPB belongs to TI's LED backlight driver product line, engineered specifically for energy-efficient, low-noise, and thermally robust LCD illumination in portable computing and professional display equipment.
FAQ
What is the maximum LED string voltage supported by the LP8551TLE/NOPB?
The LP8551TLE/NOPB supports up to 40 V on its OUTx pins and features a boost converter with 40-V maximum output voltage (VMAX). This allows driving up to 12 white LEDs in series (assuming ~3.3 V VF per LED) while maintaining headroom for current regulation. Absolute maximum rating for OUTx pins is 44 V, but sustained operation above 40 V risks overvoltage protection triggering.
How does the LP8551TLE/NOPB achieve thermal de-rating without external sensors?
The LP8551TLE/NOPB includes an on-die temperature sensor and programmable thermal threshold stored in EEPROM (TEMP_LIM[1:0]). When junction temperature exceeds the set point, the device automatically reduces LED current via the brightness control block-no external NTC or host MCU polling required. Recovery occurs only after temperature falls 20°C below the trip point to prevent oscillation.
Can the LP8551TLE/NOPB operate without connecting the VDDIO pin?
No-VDDIO must be connected to a stable 1.65–5 V supply to power the I²C interface and internal logic. If brightness is controlled exclusively via the PWM pin (not I²C), VDDIO may be tied to GND only if the system guarantees PWM input remains within valid logic thresholds (VIH = 2.2 V min); however, TI recommends supplying VDDIO at ≥1.65 V for reliable operation of all internal circuits including FAULT pin and EEPROM access.
What is the role of the RISET and RFSET resistors in the LP8551TLE/NOPB?
RISET sets maximum LED current (e.g., 16 kΩ → 23 mA) when EN_I_RES = 1 in EEPROM; RFSET selects one of four fixed PWM frequencies (156/312/625/1250 kHz) when EN_F_RES = 1. Both resistors provide hardware-based configuration fallback-allowing full functionality even if EEPROM is unprogrammed or I²C communication fails during startup.
Does the LP8551TLE/NOPB support I²C multi-master operation?
Yes-the LP8551TLE/NOPB complies with standard I²C protocol (400 kHz max) and supports multi-master arbitration. Its SDA and SCLK pins feature standard open-drain drivers with VIH = 0.8×VDDIO and VIL = 0.2×VDDIO, enabling coexistence with other I²C peripherals on the same bus without conflict, provided pull-up resistors are correctly sized for total bus capacitance.
LP8551TLE/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:
- 50mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-DSBGA
LP8551TLE/NOPB FAQ
1.How can I place an order for LP8551TLE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8551TLE/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 LP8551TLE/NOPB reliable?
The price and inventory of LP8551TLE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8551TLE/NOPB is usually 5 days.
3.What payment methods are accepted for LP8551TLE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8551TLE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8551TLE/NOPB?
LP8551TLE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8551TLE/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 LP8551TLE/NOPB?
For technical support, including LP8551TLE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8551TLE/NOPB requirements.
6.How does Aetrix verify that LP8551TLE/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8551TLE/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 LP8551TLE/NOPB meets industry standards.
7.What is the process for return or replacement of LP8551TLE/NOPB?
All LP8551TLE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8551TLE/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 LP8551TLE/NOPB part is unused and in its original packaging.
Return procedure for LP8551TLE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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