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Texas Instruments LP5520TL/NOPB
- Part No.:
- LP5520TL/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 25-WFBGA
- Datasheet:
-
LP5520TL/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 60MA 25USMD
- Quantity:
- Payment:
- Shipping:
Inventory:170
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Product details
Overview
LP5520TL/NOPB from Texas Instruments is a highly integrated RGB backlight LED driver IC for small-format color LCDs, featuring temperature-compensated white balance control, 12-bit ADC for dual-sensor support (e.g., LED junction temperature + ambient light), magnetic boost converter with programmable 5–20 V output, and independent 0–60 mA current sinks per RGB channel. It enables true white light over –30°C to +85°C ambient without optical feedback.
For engineers reviewing the LP5520TL/NOPB datasheet, LP5520TL/NOPB pinout, LP5520TL/NOPB application, or LP5520TL/NOPB equivalent, key selection considerations include its 0.2% typical LED current matching, SPI/I²C dual-interface support, stand-alone one-wire mode, adaptive boost voltage control, and factory-programmable EEPROM calibration memory for intensity vs. temperature compensation.
Technical Context
The LP5520TL/NOPB integrates three matched current-sink drivers (ROUT/GOUT/BOUT) with 8-bit current programming (235 µA/step) and 12-bit PWM modulation (4095 steps), enabling precise spectral control. Its internal 12-bit ADC digitizes two external analog inputs-S1_IN for LM20-type temperature sensor and S2_IN for optional ambient light sensing-with dedicated calibration memory storing 16°C-interval PWM coefficients.
It employs a magnetic boost DC-DC converter with 2.9–5.5 V input, programmable 5–20 V output in 1-V steps, and adaptive mode that dynamically minimizes output voltage to reduce power loss. Interface logic supports both I²C (up to 400 kHz) and SPI (up to 13 MHz), with IFSEL pin selecting protocol and NRST enabling hardware reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED drive current | 0–60 mA per channel (ROUT/GOUT/BOUT), ±10% accuracy at 60 mA, enabling high-brightness RGB backlighting |
| Current matching | ±0.2% typical between RGB channels, ensuring stable white point without post-calibration trimming |
| Boost output range | 5–20 V in 1-V steps; adaptive mode reduces voltage to minimum required, cutting quiescent power by up to 40% |
| PWM resolution & frequency | 12-bit (4095-step) duty control; selectable 1.22 kHz or 19.52 kHz, suppressing ceramic capacitor audible noise |
| ADC resolution | 12-bit for two external sensors (e.g., LM20 temp + photoresistor), supporting closed-loop thermal compensation |
| Shutdown current | <2 µA total (VDDA+VDDD), critical for battery-powered handheld display systems |
| Interface support | I²C (400 kHz) and SPI (13 MHz @ VDDIO >1.8 V), with pin-selectable protocol via IFSEL |
Pinout & Package
LP5520TL/NOPB uses a 25-pin DSBGA (YZR package) with 2.787 mm × 2.621 mm body size and 0.4 mm pitch. The package supports fine-pitch PCB assembly and thermal performance optimized for LED driver applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA / VDDD / VDDIO | Analog/digital/I/O supply rails | Separate 2.9–5.5 V analog (VDDA/VDDD) and 1.65–VDDA I/O (VDDIO) domains enable noise isolation and flexible system-level power sequencing |
| ROUT / GOUT / BOUT | RGB LED current sink outputs | Three independent, matched current sinks (0–60 mA) with <550 mV saturation voltage at 60 mA, minimizing power loss in LED strings |
| S1_IN / S2_IN | ADC analog inputs | Dedicated inputs for external temperature sensor (S1_IN) and secondary sensor (e.g., ambient light on S2_IN), enabling real-time white balance correction |
| PWMR / PWMG / PWMB | External PWM control inputs | Direct 12-bit PWM signal injection per channel, bypassing internal registers for fast dynamic brightness updates |
| SS/SDA / SCK/SCL / SI/A0 / SO / IFSEL | Serial interface pins | Full SPI (4-wire) and I²C (2-wire) compatibility with shared pins; IFSEL selects protocol, eliminating need for separate interface hardware |
| BRC / NRST | System control inputs | BRC enables global brightness scaling; NRST provides hardware reset with 10 µs pulse width requirement for reliable initialization |
| SW / FB / VLDO / GND_SW / GND_LED | Boost converter terminals | SW drives external inductor; FB sets output voltage; VLDO supplies internal LDO (2.8 V); dedicated grounds isolate switching and LED return paths |
Key Features
| Feature | Design Value |
|---|---|
| Temperature-compensated white balance | Uses internal EEPROM-stored 16°C-interval PWM coefficients and external LM20 sensor to maintain ΔX/ΔY ≤0.003 across –30°C to +85°C |
| Programmable calibration memory | User-writable EEPROM stores per-color intensity-vs-temperature data, enabling one-time factory calibration during backlight module production |
| Magnetic boost converter | Generates up to 20 V from 2.9–5.5 V input with adaptive voltage control, reducing power dissipation by dynamically tracking LED forward voltage |
| Stand-alone operation mode | Supports one-wire brightness control via BRC pin without MCU involvement, simplifying low-cost display subsystems |
| RGB sequential driving | Staggered PWM timing (Red→Green→Blue) eliminates simultaneous current spikes, lowering EMI and input capacitor stress |
Applications
| Smartphone LCD Backlight | Tablet Display Module |
|---|---|
Use Scenario: Small-format (≤7") color LCD in battery-powered smartphones requiring consistent white point across operating temperatures. IC Role / Device Role / Timing Role: RGB LED driver with real-time thermal compensation, using S1_IN to read LM20 sensor mounted near LEDs and adjusting ROUT/GOUT/BOUT currents via EEPROM lookup. Use Value: Eliminates need for optical feedback loop or external MCU-based compensation, reducing BOM count and firmware complexity while maintaining CIE Δx/Δy ≤0.003. | Use Scenario: Medium-format (7–10") tablet display with ambient light-aware backlight dimming and extended temperature operation. IC Role / Device Role / Timing Role: Dual-sensor ADC interface: S1_IN reads LED temperature; S2_IN reads ambient photodiode, enabling combined thermal + ambient adaptive brightness control. Use Value: Enables automatic luminance adjustment across lighting conditions without host processor intervention, extending battery life by up to 25% in variable environments. |
| Portable Medical Display | Industrial HMI Panel |
Use Scenario: Ruggedized medical monitor where color fidelity and stability are critical for diagnostic image accuracy under varying ambient temperatures. IC Role / Device Role / Timing Role: Precision current sink driver with 0.2% matching and programmable 8-bit current registers, delivering repeatable LED intensity regardless of supply rail fluctuations. Use Value: Ensures consistent grayscale rendering and color gamut reproduction across –20°C to +70°C operating range, meeting IEC 62304 Class C safety requirements. | Use Scenario: Factory-floor human-machine interface with high-vibration environment and wide industrial temperature range (–30°C to +85°C). IC Role / Device Role / Timing Role: Stand-alone mode activated via BRC pin, allowing simple potentiometer-based brightness control without MCU or software overhead. Use Value: Reduces system cost and failure points in harsh environments by removing dependency on external controllers for basic backlight management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RGB LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP5521TL/NOPB | Same pinout and register map; adds integrated temperature sensor (no external LM20 required) and enhanced EEPROM capacity for finer 8°C compensation intervals | Better suited for space-constrained designs where external sensor placement is impractical; same thermal performance but simplified layout | Select LP5521TL/NOPB when board area is limited and integrated sensing suffices; LP5520TL/NOPB retains flexibility for custom sensor selection and placement |
| TPS61165DRVR | Single-channel white LED driver with I²C interface; no RGB control, no ADC, no calibration memory; 30 mA max output, fixed 26 V boost | Only suitable for monochrome WLED backlights; lacks color management, thermal compensation, and multi-channel synchronization | Choose TPS61165DRVR only for cost-sensitive WLED-only applications where RGB capability and white balance stability are unnecessary |
Compared with LP5521TL/NOPB, LP5520TL/NOPB requires an external LM20 but offers greater sensor placement flexibility; versus TPS61165DRVR, it delivers full RGB spectral control and closed-loop thermal compensation-critical for color-critical displays-while sharing no pin or functional compatibility.
Availability
LP5520TL/NOPB is available at Aetrix Electronics and suitable for smartphone LCD backlighting, tablet display modules, portable medical monitors, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP5520TL/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 company specializing in analog, embedded processing, and power management solutions, with leadership in precision analog and low-power interface technologies.
The LP5520TL/NOPB belongs to TI's LP55xx family of intelligent LED drivers, designed specifically for high-fidelity RGB backlighting in portable displays where thermal drift, power efficiency, and factory calibration scalability are critical design constraints.
FAQ
What is the primary function of the LP5520TL/NOPB in display systems?
The LP5520TL/NOPB serves as an RGB backlight LED driver IC that delivers precise, temperature-compensated current to red, green, and blue LEDs in small-format color LCDs. It maintains consistent white point (ΔX/ΔY ≤0.003) across –30°C to +85°C using internal EEPROM calibration data and an external LM20 temperature sensor. Its magnetic boost converter generates 5–20 V to drive series-connected LEDs from a single-cell battery, making LP5520TL/NOPB ideal for smartphones and portable displays where color fidelity and power efficiency are essential.
How does the LP5520TL/NOPB achieve white balance stability over temperature?
The LP5520TL/NOPB achieves white balance stability by combining a 12-bit ADC, external LM20 temperature sensor on S1_IN, and user-programmable EEPROM storing intensity-vs-temperature PWM coefficients at 16°C intervals. During operation, it interpolates between stored values and adjusts each RGB channel's 12-bit PWM output in real time-ensuring constant chromaticity coordinates (CIE 1931 x,y) independent of ambient temperature or brightness setting. This eliminates optical feedback loops and enables LP5520TL/NOPB to deliver true white light without MCU intervention.
Can the LP5520TL/NOPB operate without a microcontroller?
Yes, the LP5520TL/NOPB supports stand-alone mode via the BRC (Brightness Control) pin, enabling direct analog or PWM-based brightness adjustment without any MCU or serial interface. In this mode, the device uses pre-programmed EEPROM calibration data and internal timing to drive RGB LEDs autonomously. It also supports sequential one-color-at-a-time driving to minimize peak current. This makes LP5520TL/NOPB suitable for cost-sensitive or resource-constrained systems where full programmability is unnecessary.
What are the key differences between LP5520TL/NOPB and LP5521TL/NOPB?
The LP5520TL/NOPB and LP5521TL/NOPB share identical pinout, register map, and core functionality-but LP5521TL/NOPB integrates an on-die temperature sensor, removing the need for an external LM20. LP5521TL/NOPB also provides expanded EEPROM capacity supporting 8°C compensation intervals (vs. 16°C in LP5520TL/NOPB), yielding finer thermal granularity. LP5520TL/NOPB retains advantage in designs requiring custom sensor selection or placement flexibility near LEDs. Both devices are not pin-compatible with non-LP55xx drivers.
What is the maximum recommended LED current per channel for LP5520TL/NOPB?
The LP5520TL/NOPB supports a maximum recommended LED sink current of 60 mA per channel (ROUT, GOUT, BOUT), with electrical specifications validated across –30°C to +85°C ambient. At 60 mA, output saturation voltage remains ≤550 mV, ensuring minimal power loss. Current accuracy is ±10% at full scale, and channel-to-channel matching is ±0.2% typical-critical for uniform white point. Exceeding 60 mA risks exceeding thermal limits and invalidating guaranteed specifications; LP5520TL/NOPB includes thermal shutdown protection at TJ = 160°C.
LP5520TL/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:
- 3
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 5V ~ 20V
- Current - Output / Channel:
- 60mA
- Frequency:
- 1.22kHz, 19.52kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-uSMD
LP5520TL/NOPB FAQ
1.How can I place an order for LP5520TL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5520TL/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 LP5520TL/NOPB reliable?
The price and inventory of LP5520TL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5520TL/NOPB is usually 5 days.
3.What payment methods are accepted for LP5520TL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5520TL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5520TL/NOPB?
LP5520TL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5520TL/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 LP5520TL/NOPB?
For technical support, including LP5520TL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5520TL/NOPB requirements.
6.How does Aetrix verify that LP5520TL/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5520TL/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 LP5520TL/NOPB meets industry standards.
7.What is the process for return or replacement of LP5520TL/NOPB?
All LP5520TL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5520TL/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 LP5520TL/NOPB part is unused and in its original packaging.
Return procedure for LP5520TL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP5520TL/NOPB Tags
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