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Texas Instruments LP5520TLX/NOPB
- Part No.:
- LP5520TLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 25-WFBGA
- Datasheet:
-
LP5520TLX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 60MA 25USMD
- Quantity:
- Payment:
- Shipping:
Inventory:2,943
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Product details
Overview
LP5520TLX/NOPB from Texas Instruments is a 3-channel RGB LED backlight driver IC with integrated magnetic boost converter, temperature-compensated white balance control, and dual ADC inputs for external sensor interfacing. It delivers programmable current sinks (0–60 mA per channel), 12-bit PWM resolution, and adaptive output voltage regulation (5–20 V) for small-format color LCDs in portable electronics.
For engineers reviewing the LP5520TLX/NOPB datasheet, LP5520TLX/NOPB pinout, LP5520TLX/NOPB application, or LP5520TLX/NOPB equivalent, key selection criteria include its calibrated white balance over –30°C to +85°C ambient, 0.2% typical LED current matching, I²C/SPI dual-interface support, stand-alone one-wire mode, and DSBGA-25 package compatibility with space-constrained display modules.
Technical Context
The LP5520TLX/NOPB integrates three independent current-sink drivers with 8-bit current programming (235 µA/step) and 12-bit PWM modulation (4095 steps), enabling precise intensity control per RGB channel. Its internal calibration EEPROM stores temperature-dependent PWM coefficients at 16°C intervals (–40°C to +120°C), enabling real-time white balance correction without optical feedback.
A dedicated magnetic boost converter provides regulated output voltage (5–20 V, 1-V steps) with adaptive mode that minimizes power loss by dynamically adjusting VOUT to the minimum required for LED forward voltage. Two 12-bit ADC channels support external LM20-type temperature sensing on S1_IN and ambient light measurement on S2_IN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Driver Channels | 3 independent current sinks (ROUT/GOUT/BOUT) for RGB LEDs |
| Max Sink Current | 60 mA per channel - supports high-brightness small-form-factor displays |
| Current Matching | ±0.2% typical - ensures consistent color point across brightness levels |
| PWM Resolution | 12-bit (4095 steps) with selectable 1.22 kHz / 19.52 kHz frequency - eliminates audible noise and ceramic capacitor squeal |
| Boost Output Range | 5 V to 20 V, programmable in 1-V steps - accommodates diverse LED VF stacks (e.g., 3× white or 2× RGB) |
| ADC Inputs | Two 12-bit channels (S1_IN, S2_IN) - enables closed-loop thermal compensation and ambient light adaptation |
| Interface Support | I²C (400 kHz) and SPI (up to 13 MHz) - allows flexible host MCU integration and firmware-updatable calibration |
Pinout & Package
LP5520TLX/NOPB uses a 25-pin DSBGA (YZR) package measuring 2.787 mm × 2.621 mm with 0.4-mm pitch. The package supports bottom-side thermal dissipation via GND_LED and GND_SW terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA / VDDD / VDDIO | Analog, digital, and I/O supply rails | Separate domains enable noise isolation; VDDA/VDDD tied together at power-on per sequencing requirement |
| ROUT / GOUT / BOUT | Current-sink outputs | Drive red/green/blue LEDs directly; each supports 0–60 mA with <550 mV saturation voltage at 60 mA |
| PWMR / PWMG / PWMB | Dedicated PWM control inputs | Enable external microcontroller-driven dimming independent of internal calibration engine |
| S1_IN / S2_IN | ADC analog inputs | S1_IN connects to LM20 temperature sensor near LEDs; S2_IN supports ambient light sensor or secondary thermal monitor |
| SS/SDA / SCK/SCL / SI/A0 / SO / IFSEL | I²C/SPI interface pins | Shared pin functions reduce PCB footprint; IFSEL selects protocol (high = SPI, low = I²C) |
| SW / FB | Boost converter switch and feedback | SW drives external inductor; FB sets output voltage via resistor divider - enables adaptive VOUT control |
| BRC / NRST | Brightness control and master reset | BRC provides global analog dimming; NRST is active-low asynchronous reset with 10 µs minimum pulse width |
Key Features
| Feature | Design Value |
|---|---|
| Temperature-Compensated White Balance | Maintains ΔX/ΔY ≤0.003 over –30°C to +85°C using factory-programmed EEPROM coefficients and external LM20 sensor |
| Adaptive Boost Voltage Control | Reduces system power consumption by dynamically lowering VOUT to just above total LED string VF, minimizing switching losses |
| Stand-Alone One-Wire Mode | Enables basic brightness control via BRC pin without host MCU - ideal for cost-sensitive or firmware-limited designs |
| 0.2% Typical Current Matching | Ensures stable chromaticity across brightness settings and temperature drift - critical for medical and industrial display accuracy |
| Shutdown Current | <2 µA - extends battery life in always-on display applications such as smartwatches and handheld diagnostics |
Applications
| Smartphone LCD Backlighting | Medical Diagnostic Display |
|---|---|
|
Use Scenario: Driving RGB LED backlight in 3.5–5.5-inch AMOLED/LCD panels requiring precise white point stability across operating temperatures. IC Role / Device Role / Timing Role: RGB LED driver with integrated thermal compensation engine and boost regulator - replaces discrete current sources and external DACs. Use Value: Eliminates need for optical feedback sensors and closed-loop camera calibration, reducing BOM count and assembly complexity while maintaining CIE 1931 x,y deviation ≤0.003. |
Use Scenario: Backlighting high-contrast monochrome or color LCDs in portable ultrasound and ECG devices where color fidelity impacts clinical interpretation. IC Role / Device Role / Timing Role: Precision current sink with calibrated white balance - ensures consistent luminance and chromaticity during battery voltage sag and ambient temperature shifts. Use Value: Delivers ±0.2% current matching and real-time thermal correction, preventing perceptible tint shift that could mask subtle grayscale transitions in diagnostic imaging. |
| Industrial HMI Panel | Wearable Device Display |
|
Use Scenario: Illuminating ruggedized touchscreens in factory-floor HMIs exposed to wide ambient temperature swings (–25°C to +70°C). IC Role / Device Role / Timing Role: Standalone RGB driver with one-wire BRC control and I²C programmability - supports both manual dimming and automated calibration updates. Use Value: Maintains target white point without host processor intervention, enabling deterministic backlight behavior even during MCU sleep or firmware update cycles. |
Use Scenario: Powering compact RGB backlights in smartwatches and fitness trackers where board area and quiescent current are critical constraints. IC Role / Device Role / Timing Role: Ultra-small DSBGA-25 LED driver with <2 µA shutdown current and integrated LDO (VLDO) - simplifies power tree and reduces component count. Use Value: Achieves 2.787 mm × 2.621 mm footprint and sub-µA standby, extending battery runtime beyond 7 days in always-on display modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RGB LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP5521TP/NOPB | Same DSBGA-25 package and pinout; adds integrated temperature sensor (no external LM20 required); identical calibration architecture and current specs | Better suited for designs lacking space for external sensor placement; requires no S1_IN routing | Select LP5521TP/NOPB when eliminating external temperature sensor layout complexity is prioritized over minimal BOM cost increase |
| MAX16826ATL+T | 3-channel constant-current driver with 10-bit PWM; no internal calibration memory or ADC; requires external microcontroller for thermal compensation | Targeted at cost-sensitive applications where white point stability is secondary to basic dimming functionality | Choose MAX16826ATL+T only if full thermal compensation is handled externally and system-level calibration is acceptable |
Compared with LP5520TLX/NOPB, LP5521TP/NOPB offers tighter integration with on-die temperature sensing but same calibration performance, while MAX16826ATL+T lacks embedded compensation and demands host-based white balance management - making LP5520TLX/NOPB optimal for standalone, high-fidelity display backlighting.
Availability
LP5520TLX/NOPB is available at Aetrix Electronics and suitable for smartphone LCD backlighting, medical diagnostic displays, industrial HMI panels, and wearable device displays requiring stable component supply and long-term lifecycle support.
Supply support for LP5520TLX/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 and embedded processing technologies, with leadership in power management, signal chain, and high-reliability interface solutions.
The LP5520TLX/NOPB belongs to TI's LP55xx family of intelligent LED drivers designed specifically for thermally stable RGB backlighting in portable and medical displays - emphasizing factory-calibrated white balance and minimal external component count.
FAQ
What is the maximum LED forward voltage supported by LP5520TLX/NOPB?
The LP5520TLX/NOPB boost converter supports an output voltage range of 5 V to 20 V, adjustable in 1-V steps. This allows driving RGB LED strings with combined forward voltages up to 20 V - sufficient for configurations such as three series-connected blue LEDs (~3.4 V each) plus margin. The adaptive mode automatically lowers VOUT to the minimum required, improving efficiency.
Does LP5520TLX/NOPB require an external temperature sensor?
Yes, LP5520TLX/NOPB requires an external LM20 or compatible analog temperature sensor connected to the S1_IN pin for thermal compensation. The device uses this input to index into its internal EEPROM calibration table and adjust RGB PWM values in real time. S2_IN supports a second sensor (e.g., ambient light) but is optional.
Can LP5520TLX/NOPB operate without a host microcontroller?
Yes, LP5520TLX/NOPB supports stand-alone operation using its one-wire BRC pin for global brightness control. In this mode, it applies pre-programmed calibration data and internal PWM generation without I²C or SPI communication - ideal for simple dimming applications where full programmability is unnecessary.
What is the current matching specification between ROUT, GOUT, and BOUT on LP5520TLX/NOPB?
LP5520TLX/NOPB guarantees ±0.2% typical current matching between its three LED driver outputs (ROUT, GOUT, BOUT) when set to the same current level (e.g., 20 mA). This tight matching ensures consistent color point and eliminates visible tint shifts across brightness levels - critical for high-fidelity display applications.
How does the adaptive boost voltage feature improve power efficiency in LP5520TLX/NOPB?
The adaptive boost voltage feature in LP5520TLX/NOPB continuously monitors LED current and adjusts the output voltage to the minimum level needed to maintain regulation - typically just 0.5–1.0 V above the total forward voltage of the driven LED string. This reduces switching losses and conduction losses in the external inductor and MOSFET, lowering overall system power consumption by up to 30% compared to fixed-output boost schemes.
LP5520TLX/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
LP5520TLX/NOPB FAQ
1.How can I place an order for LP5520TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5520TLX/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 LP5520TLX/NOPB reliable?
The price and inventory of LP5520TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5520TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LP5520TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5520TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5520TLX/NOPB?
LP5520TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5520TLX/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 LP5520TLX/NOPB?
For technical support, including LP5520TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5520TLX/NOPB requirements.
6.How does Aetrix verify that LP5520TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5520TLX/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 LP5520TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LP5520TLX/NOPB?
All LP5520TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5520TLX/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 LP5520TLX/NOPB part is unused and in its original packaging.
Return procedure for LP5520TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP5520TLX/NOPB Tags
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