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Texas Instruments LP5526TLX/NOPB
- Part No.:
- LP5526TLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 25-WFBGA
- Datasheet:
-
LP5526TLX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 1.5A 25USMD
- Quantity:
- Payment:
- Shipping:
Inventory:1,413
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Product details
Overview
LP5526TLX/NOPB from Texas Instruments (formerly National Semiconductor) is a lighting management unit IC with integrated high-voltage boost converter, designed to drive display backlights (MAIN/SUB), RGB indicator LEDs, and camera flash LEDs in portable electronics. It delivers up to 150mA total boost output current, supports 2 independent constant-current white LED strings (0.1mA resolution), and provides dedicated flash safety timer and I²C-controlled RGB dimming.
For engineers reviewing the LP5526TLX/NOPB datasheet, LP5526TLX/NOPB pinout, LP5526TLX/NOPB application, or LP5526TLX/NOPB equivalent, key selection considerations include boost output voltage programmability (8–20V), RGB driver mode selection (switch vs. constant-current), flash safety timer behavior, GPIO[0]/PWM external control capability, and thermal shutdown threshold (150°C typical).
Technical Context
The LP5526TLX/NOPB integrates a 1MHz magnetic boost DC/DC converter with CPM (current-programmed mode) control, programmable output voltage (8–20V in 12 steps), and overvoltage/overcurrent/feedback-break/duty-cycle protections. Its RGB outputs (RLED/GLED/BLED) support three operating modes: internal PWM color/brightness control, direct ON/OFF register control, and external PWM modulation via GPIO[0].
Backlight drivers MAIN and SUB operate as high-resolution constant-current sinks (8-bit DAC, 0.1mA step), configurable for individual or shared DAC control (DISPL bit). Flash functionality leverages RGB outputs in parallel, with safety timer activation on >1s pulse or 1s register inactivity, and supports pre-flash/current-step flash sequencing via I²C register writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Output Voltage | Programmable 8–20V in 12 discrete steps; sets maximum LED string voltage for flash/backlight operation. |
| Max Boost Load Current | 150mA continuous (at VIN > 3.2V, VOUT = 20V); enables driving multiple series-connected flash LEDs. |
| RGB Output Mode | Configurable switch mode (3.2Ω RDS(on)) or constant-current sink (50mA max per channel, set by RRGB resistor). |
| Backlight Current Resolution | 0.1mA per step across 0–25.5mA range (8-bit DAC); ensures precise brightness matching for MAIN/SUB displays. |
| I²C Interface | 2-wire, low-voltage compatible (VDDIO = 1.65–VDD1); reduces PCB routing complexity and pin count. |
| Flash Safety Timer | 1-second timeout for external PWM-triggered flash or RGB register inactivity; disables affected outputs and sets SAFETY_SET flag. |
| Thermal Protection | Internal thermal shutdown at TJ ≈ 150°C (typ.), re-enables at TJ ≈ 130°C (typ.); prevents permanent damage under overload. |
Pinout & Package
LP5526TLX/NOPB uses a 25-bump micro SMD package (2.54mm × 2.54mm × 0.6mm, NS package TLA25CCA), with exposed thermal pad connected to GND for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MAIN / SUB | Constant-current sink output | Drives white LED strings; current set by 8-bit DAC (0–25.5mA, 0.1mA step); supports shared DAC control when DISPL = 1. |
| RLED / GLED / BLED | RGB LED current sink output | Each supports switch mode (3.2Ω) or constant-current mode (max 50mA); controlled via CC_SW bit and RGB registers. |
| SW / FB | Boost converter power switch / feedback | SW drives external inductor; FB senses output voltage divider to regulate boost output (8–20V). |
| GPIO[0]/PWM | Multi-function I/O | Configurable as external PWM input (active-high) to modulate MAIN, SUB, or RGB brightness; requires EN_PWM_PIN = 1. |
| NRST | Active-low reset input | Hardware reset pin; forces all registers to default values when pulled low; also triggered by internal POR below 1.5V. |
| SCL / SDA | I²C clock/data interface | Standard 2-wire interface for configuration and control; VDDIO-compatible (1.65–VDD1). |
| VDD1 / VDD2 / VDDIO | Power supply inputs | VDD1/VDD2: 3.0–5.5V core supplies; VDDIO: 1.65–VDD1 digital I/O supply; must power up VDD1/VDD2 before VDDIO. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable boost voltage | 8–20V in 12 steps via 8-bit register (0DH); avoids overvoltage stress on LEDs and improves efficiency across battery voltage range. |
| Dual independent backlight drivers | MAIN and SUB each provide 0.1mA-resolution constant-current sinking; DISPL bit enables matched current sharing for larger displays (up to 8 LEDs). |
| RGB driver flexibility | Three control methods: internal PWM color/brightness (16 colors + logarithmic brightness), direct register ON/OFF, or external PWM modulation - enabling UI effects and flash coordination. |
| Flash safety timer | 1-second hardware-enforced timeout for flash pulses or register inactivity; prevents thermal damage without software dependency. |
| Thermal shutdown protection | Automatic disable at ~150°C junction temperature; resumes operation at ~130°C; protects against sustained overloads in compact handheld enclosures. |
Applications
| Cellular Phone Keypad Illumination | Digital Camera Flash Control |
|---|---|
Use Scenario: Illuminating alphanumeric keypad LEDs during low-light operation while minimizing power draw and heat generation. IC Role / Device Role / Timing Role: LP5526TLX/NOPB acts as RGB LED driver in constant-current mode, using internal PWM to generate smooth color transitions and adjustable brightness levels. Use Value: Enables dynamic UI feedback with consistent color fidelity and <50mA per channel current limiting, reducing thermal load on thin phone PCBs. | Use Scenario: Delivering controlled pre-flash and main flash pulses for auto-focus assist and image capture in compact digital cameras. IC Role / Device Role / Timing Role: LP5526TLX/NOPB functions as flash driver by paralleling RLED/GLED/BLED outputs, regulated by boost converter and triggered via GPIO[0]/PWM with 1s safety timer. Use Value: Provides precise 150mA flash current with hardware-enforced timeout, eliminating risk of LED overheating during extended focus-assist sequences. |
| MP3 Player Display Backlight | Portable PDA Main/Sub Screen Lighting |
Use Scenario: Driving white LED backlight for OLED or TFT display in battery-powered audio players requiring long runtime and uniform brightness. IC Role / Device Role / Timing Role: LP5526TLX/NOPB serves as MAIN backlight driver with fade-in/fade-out control (0.65s or 1.3s ramp), using 8-bit DAC for fine-grained dimming. Use Value: Achieves flicker-free, smooth brightness transitions and 0.1mA current resolution for optimal contrast and battery life in variable ambient light. | Use Scenario: Powering dual-display systems (e.g., main screen + secondary status panel) in PDAs where current matching between MAIN and SUB is critical for visual consistency. IC Role / Device Role / Timing Role: LP5526TLX/NOPB operates MAIN and SUB drivers in shared-DAC mode (DISPL = 1), ensuring identical current profiles across both LED strings. Use Value: Eliminates display luminance mismatch between panels without requiring external current-sense calibration or separate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP5523TLX/NOPB | 3-channel RGB driver only; no MAIN/SUB backlight outputs or boost converter; smaller 16-bump package. | Limited to RGB indicators only; cannot replace LP5526TLX/NOPB in backlight or flash applications. | Select only if design requires RGB control only and space constraints prohibit 25-bump footprint. |
| TPS61165DRVR | Dedicated white LED boost driver (no RGB); 40V output, 30mA per channel, analog/digital dimming; no flash safety timer or I²C interface. | Supports higher voltage white LED strings but lacks color mixing, flash sequencing, and programmable safety features. | Choose when system needs high-efficiency WLED driving only, with minimal firmware overhead and no RGB functionality required. |
Compared with LP5526TLX/NOPB, LP5523TLX/NOPB omits backlight and boost capabilities entirely, while TPS61165DRVR provides superior WLED performance but sacrifices RGB control, flash safety, and I²C configurability - making LP5526TLX/NOPB uniquely suited for integrated lighting management in space-constrained portable devices.
Availability
LP5526TLX/NOPB is available at Aetrix Electronics and suitable for cellular phones, digital cameras, and MP3 players requiring stable component supply, precise LED current control, and integrated flash safety logic.
Supply support for LP5526TLX/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 acquired National Semiconductor in 2011 and maintains full technical and supply chain support for legacy lighting management ICs like the LP5526 series.
The LP5526 product line was engineered specifically for portable consumer electronics requiring integrated backlight, RGB, and flash LED control in a single compact package with robust thermal and safety features.
FAQ
What is the maximum continuous current the LP5526TLX/NOPB boost converter can deliver?
The LP5526TLX/NOPB boost converter delivers up to 150mA continuous load current when input voltage exceeds 3.2V and output voltage is set to 20V. At lower input voltages (3.0–3.2V), the maximum continuous current is 100mA. Non-continuous peak current reaches 150mA across the full input range, supporting short-duration flash pulses.
How does the LP5526TLX/NOPB implement flash safety, and can it be disabled?
The LP5526TLX/NOPB implements flash safety via a 1-second hardware timer that disables RGB outputs if the external PWM trigger pulse exceeds 1s or if no write occurs to the RGB max current register (02H) for 1s. Safety is individually configurable per channel (EN_SAFETY_R/G/B) but cannot be fully disabled - it is a hardwired protection feature required for reliable flash operation.
Can the LP5526TLX/NOPB drive white LEDs and RGB LEDs simultaneously?
Yes, the LP5526TLX/NOPB can drive white LEDs (via MAIN/SUB constant-current sinks) and RGB LEDs (via RLED/GLED/BLED outputs) simultaneously. The boost converter powers both subsystems, and I²C registers allow independent control of backlight brightness, RGB color, and flash timing without resource conflict.
What is the purpose of the DISPL bit in the LP5526TLX/NOPB WLED control register?
When DISPL = 1 in register 03H, the LP5526TLX/NOPB configures MAIN and SUB backlight drivers to share the same 8-bit DAC current setting, ensuring identical current profiles across both LED strings. This mode supports larger displays (up to 8 white LEDs) with matched luminance, eliminating inter-panel brightness variation in dual-display PDAs.
Does the LP5526TLX/NOPB require external components for boost converter operation?
Yes, the LP5526TLX/NOPB requires external components for boost operation: an inductor (typically 10µH), input/output capacitors (10µF and 2×4.7µF), feedback resistors for output voltage setting, and optional EMI filter (RSW/CSW) on the SW pin. The timing resistor (RT = 82kΩ) sets oscillator frequency and thus boost switching frequency (1MHz typical).
LP5526TLX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 25-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 5
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 8V ~ 20V
- Current - Output / Channel:
- 1.5A (Switch)
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-uSMD
LP5526TLX/NOPB FAQ
1.How can I place an order for LP5526TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5526TLX/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 LP5526TLX/NOPB reliable?
The price and inventory of LP5526TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5526TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LP5526TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5526TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5526TLX/NOPB?
LP5526TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5526TLX/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 LP5526TLX/NOPB?
For technical support, including LP5526TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5526TLX/NOPB requirements.
6.How does Aetrix verify that LP5526TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5526TLX/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 LP5526TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LP5526TLX/NOPB?
All LP5526TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5526TLX/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 LP5526TLX/NOPB part is unused and in its original packaging.
Return procedure for LP5526TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP5526TLX/NOPB Tags
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