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Texas Instruments LP5526TL/NOPB
- Part No.:
- LP5526TL/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 25-WFBGA
- Datasheet:
-
LP5526TL/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 1.5A 25USMD
- Quantity:
- Payment:
- Shipping:
Inventory:2,669
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Product details
Overview
LP5526TL/NOPB from Texas Instruments (formerly National Semiconductor) is a lighting management unit IC for portable devices, integrating a high-voltage boost converter (up to 20 V), dual white LED backlight drivers (MAIN/SUB), and three-channel RGB/flash LED drivers (RLED/GLED/BLED). It delivers up to 150 mA total boost load current, supports constant-current sink or switch-mode RGB outputs, and includes a 1-second flash safety timer. It is used in cellular phone display backlighting and RGB camera flash applications.
For engineers reviewing the LP5526TL/NOPB datasheet, LP5526TL/NOPB pinout, LP5526TL/NOPB application, or LP5526TL/NOPB equivalent, key selection considerations include its 25-bump micro SMD package (2.54 mm × 2.54 mm), I²C-compatible 2-wire interface, programmable boost output voltage (8–20 V in 12 steps), independent 8-bit DAC-controlled MAIN/SUB backlight currents (0.1 mA step), and RGB driver flexibility across constant-current, switch, or external PWM control modes.
Technical Context
The LP5526TL/NOPB implements a current-programmed mode (CPM) magnetic boost DC/DC converter operating at 1 MHz (with 82 kΩ timing resistor), featuring overvoltage, overcurrent, feedback break, and duty-cycle limiting protections. Its RGB outputs support overlapping or non-overlapping PWM timing with logarithmic brightness control (8-step scale) and 16 predefined color codes.
Backlight drivers operate in regulated constant-current sink mode with independent 8-bit DACs; when DISPL = 1, MAIN DAC controls both MAIN and SUB outputs for improved current matching across up to 8-series white LEDs. Flash operation uses dedicated safety logic tied to GPIO[0]/PWM, with automatic shutdown if pulse exceeds 1 second or if no register access occurs for 1 s on enabled RGB channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Output Voltage | Programmable 8–20 V in 12 discrete steps via register 0DH; enables driving series-connected white or flash LEDs from single Li-ion battery (3.0–4.5 V). |
| Max Boost Load Current | 150 mA continuous (at VIN > 3.2 V, VOUT = 20 V); supports high-brightness camera flash LED strings. |
| Backlight Driver Resolution | 8-bit DAC per channel (MAIN/SUB) with 0.1 mA step size; allows precise dimming control for display backlight uniformity. |
| RGB Output Modes | Configurable constant-current sink (max 50 mA/channel) or low-RDS(on) switch mode (3.2 Ω typical); eliminates need for external ballast resistors in CC mode. |
| I²C Interface | 2-wire, low-voltage compatible (VDDIO = 1.65–VDD1); reduces PCB routing complexity and pin count vs parallel control. |
| Flash Safety Timer | Hardware-enforced 1-second timeout on GPIO[0]/PWM-triggered flash or idle register access; prevents thermal damage during firmware faults. |
| Package | 25-bump thin micro SMD (TLA25CCA), 2.54 mm × 2.54 mm × 0.6 mm; optimized for space-constrained mobile PCBs. |
Pinout & Package
LP5526TL/NOPB uses a 25-bump thin micro SMD package (NS Package Number TLA25CCA), measuring 2.54 mm × 2.54 mm × 0.6 mm, with large bumps and bottom-side solder pads. Pin mapping follows standard top-view orientation with bump identifiers (e.g., 5E, 4D) corresponding to functional terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MAIN, SUB | Constant-current sink outputs | Drive white LED strings for primary and secondary displays; each supports 0–30 mA typical, controlled by 8-bit DAC. |
| RLED, GLED, BLED | RGB LED current sinks/switches | Individually controllable outputs for red/green/blue LEDs; support constant-current (max 50 mA) or switch-mode (max 60 mA) operation. |
| SW, FB | Boost converter power switch & feedback | SW connects internal NMOS to inductor; FB senses output voltage divider to regulate boost output (8–20 V). |
| SCL, SDA | I²C clock/data interface | Enable configuration and real-time control of all drivers, registers, and safety features using standard 2-wire protocol. |
| GPIO[0]/PWM | Multi-function logic I/O | Configurable as external PWM input to modulate MAIN/SUB backlight or trigger RGB flash; active-high polarity. |
| NRST | Active-low reset input | Hardware reset that clears all registers to defaults; also triggered internally during power-on reset (VDD1/VDD2 < 1.5 V). |
| VDD1, VDD2, VDDIO, VDDA | Power supply inputs/outputs | VDD1/VDD2 = 3.0–5.5 V core supplies; VDDIO = 1.65–VDD1 digital I/O rail; VDDA = 2.80 V LDO output for analog blocks. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent backlight drivers | MAIN and SUB outputs each support 0–30 mA constant current with 0.1 mA resolution; DISPL bit enables MAIN DAC to drive both for matched current across 8-LED arrays. |
| Programmable high-voltage boost | 8–20 V output in 12 discrete steps via 8-bit register; integrated CPM controller ensures stable regulation under variable battery input (3.0–4.5 V). |
| RGB/flash multimode operation | Three independent outputs support constant-current sink, switch-mode, or external PWM control-enabling flexible use for indicator LEDs, ambient lighting, or camera flash. |
| Hardware flash safety timer | Automatic shutdown of enabled RGB outputs after 1 s of GPIO[0]/PWM high state or register inactivity; prevents thermal runaway without firmware intervention. |
| Integrated fade control | Hardware-accelerated MAIN/SUB backlight fade-in/fade-out with selectable 0.65 s or 1.3 s full-scale transition time; reduces MCU processing load. |
Applications
| Mobile Display Backlighting | RGB Indicator Lighting |
|---|---|
Use Scenario: Driving white LED strings for main and sub LCD displays in smartphones and PDAs with tight brightness uniformity requirements. IC Role / Device Role / Timing Role: LP5526TL/NOPB acts as dual-channel constant-current LED driver with synchronized 8-bit DAC control and optional shared MAIN DAC mode (DISPL = 1) for enhanced current matching. Use Value: Enables precise, flicker-free dimming across multiple LED strings while minimizing MCU overhead via hardware fade and I²C register-based configuration. | Use Scenario: Providing user-visible status indication using red/green/blue LEDs on portable audio players or handheld instrumentation. IC Role / Device Role / Timing Role: LP5526TL/NOPB serves as standalone RGB controller with 16 predefined colors, logarithmic brightness scaling, and overlapping/non-overlapping PWM timing modes. Use Value: Delivers consistent color rendering and smooth transitions without external timing components-reducing BOM count and layout area. |
| Camera Flash Control | Adaptive UI Lighting |
Use Scenario: Delivering high-current pulsed illumination for smartphone camera modules requiring pre-flash and main flash sequences. IC Role / Device Role / Timing Role: LP5526TL/NOPB functions as flash LED driver using parallel RLED/GLED/BLED outputs powered by the internal 20 V boost converter, with hardware safety timer enforcement. Use Value: Guarantees safe flash operation up to 150 mA total load while supporting three distinct flash activation methods (external PWM, register current update, or dedicated flash mode). | Use Scenario: Dynamically adjusting ambient lighting intensity and hue based on environmental light sensor input or user preference in smart remotes or wearable interfaces. IC Role / Device Role / Timing Role: LP5526TL/NOPB operates as programmable RGB lighting engine with I²C-configurable color/brightness registers and GPIO[0]/PWM-triggered updates. Use Value: Allows real-time lighting adaptation with minimal host processor involvement-leveraging internal PWM generators and safety logic for robust operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP5523TL/NOPB | 3-channel RGB driver only; no backlight (MAIN/SUB) outputs or boost converter; smaller 16-bump micro SMD package. | Targeted at RGB-only indicator applications; cannot replace LP5526TL/NOPB in backlight + flash systems. | Select LP5523TL/NOPB only when RGB control suffices and board space is extremely constrained. |
| TPS61165DRVR | Dedicated white LED boost driver with 40 V output and 30 mA per channel; no RGB or flash safety logic; uses PWM/dimming enable interface instead of I²C. | Optimized for high-efficiency WLED backlighting only; lacks color mixing, flash sequencing, or integrated safety timer. | Choose TPS61165DRVR for cost-sensitive, single-function white LED applications where I²C configurability is unnecessary. |
Compared with LP5526TL/NOPB, LP5523TL/NOPB omits backlight and boost functionality-making it unsuitable for display+flash integration-while TPS61165DRVR trades I²C programmability and RGB versatility for higher WLED efficiency and simpler control, requiring external logic for flash timing and safety.
Availability
LP5526TL/NOPB is available at Aetrix Electronics and suitable for mobile handset backlighting, camera flash subsystems, and RGB status lighting requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for LP5526TL/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 products including the LP5526 family.
The LP5526TL/NOPB belongs to TI's portable lighting management portfolio, designed specifically for space- and power-constrained mobile devices requiring integrated backlight, RGB, and flash control with hardware safety enforcement.
FAQ
What is the maximum continuous current the LP5526TL/NOPB boost converter can deliver?
The LP5526TL/NOPB boost converter delivers up to 150 mA continuous load current when input voltage exceeds 3.2 V and output is set to 20 V. At lower input voltages (3.0–3.2 V), maximum continuous current is 100 mA. These limits are specified in the Electrical Characteristics table under "Maximum Continuous Load Current" and reflect thermal design constraints of the 25-bump micro SMD package.
How does the LP5526TL/NOPB implement flash safety, and can it be disabled?
The LP5526TL/NOPB implements flash safety via hardware timers that disable RGB outputs after 1 second of GPIO[0]/PWM high state (flash mode) or 1 second of inactivity on the RGB max current register (address 02H). Safety is individually configurable per channel using EN_SAFETY_R/G/B bits. It cannot be fully disabled-only bypassed per channel by clearing the corresponding EN_SAFETY bit-but doing so removes critical thermal protection for flash operation.
Can the LP5526TL/NOPB drive white LEDs and RGB LEDs simultaneously from the same boost output?
Yes-the LP5526TL/NOPB supports simultaneous operation: MAIN and SUB backlight outputs draw from the internal boost converter for white LED strings, while RLED/GLED/BLED outputs can also be powered from the same boosted rail (up to 20 V) when configured in constant-current mode. The total boost load must remain within 150 mA continuous limit, and RGB outputs require proper current-setting resistors (RRGB) or external ballasts depending on mode.
What is the purpose of the DISPL bit in the LP5526TL/NOPB WLED Control Register (03H)?
The DISPL bit (bit 2) in register 03H configures whether MAIN and SUB backlight drivers operate independently or share the MAIN DAC. When DISPL = 0, each uses its own 8-bit DAC; when DISPL = 1, the MAIN DAC controls both outputs-improving current matching across larger LED arrays (e.g., 8-series white LEDs). This reduces part-to-part variation in brightness uniformity without requiring external calibration.
Does the LP5526TL/NOPB support external PWM dimming for both backlight and RGB outputs?
Yes-LP5526TL/NOPB supports external PWM dimming on both domains. GPIO[0]/PWM can modulate MAIN/SUB backlight brightness when EN_MAIN_PWM or EN_SUB_PWM bits are set, and it can also trigger RGB flash or modulate RGB brightness when EN_EXT_R/G/B_PWM bits are enabled. Polarity is active-high: LED output activates when the PWM signal is high, and internal PWM (if enabled) is gated by the external signal.
LP5526TL/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
LP5526TL/NOPB FAQ
1.How can I place an order for LP5526TL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5526TL/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 LP5526TL/NOPB reliable?
The price and inventory of LP5526TL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5526TL/NOPB is usually 5 days.
3.What payment methods are accepted for LP5526TL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5526TL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5526TL/NOPB?
LP5526TL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5526TL/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 LP5526TL/NOPB?
For technical support, including LP5526TL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5526TL/NOPB requirements.
6.How does Aetrix verify that LP5526TL/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5526TL/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 LP5526TL/NOPB meets industry standards.
7.What is the process for return or replacement of LP5526TL/NOPB?
All LP5526TL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5526TL/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 LP5526TL/NOPB part is unused and in its original packaging.
Return procedure for LP5526TL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP5526TL/NOPB Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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