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Texas Instruments LP5521TMX/NOPB
- Part No.:
- LP5521TMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA
- Datasheet:
-
LP5521TMX/NOPB.pdf
- Description:
- IC LED DRVR RGLTR I2C 20TUSMD
- Quantity:
- Payment:
- Shipping:
Inventory:8,366
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Product details
Overview
LP5521TMX/NOPB from Texas Instruments is a three-channel RGB LED driver IC with integrated adaptive charge pump, 8-bit programmable current sources (up to 25.5 mA per channel), autonomous program execution engine, and I²C-compatible interface. It delivers precise color-mixed lighting effects for mobile indicator and backlight applications across full Li-ion battery range (2.7 V to 5.5 V).
For engineers reviewing the LP5521TMX/NOPB datasheet, LP5521TMX/NOPB pinout, LP5521TMX/NOPB application, or LP5521TMX/NOPB equivalent, key selection considerations include charge pump gain auto-selection (1×/1.5×), 1% current matching between R/G/B channels, 50 mV typical saturation voltage, dual general-purpose I/Os (GPO, TRIG), and four-pin-selectable I²C addresses enabling up to four devices on one bus.
Technical Context
The LP5521TMX/NOPB integrates a pre-regulated switched-capacitor charge pump with automatic gain switching based on real-time LED forward voltage monitoring - selecting 1× bypass mode when headroom suffices and 1.5× boost mode (4.5 V typical VOUT) when required. Its three independent constant-current LED drivers feature 8-bit current control (100 µA resolution) and 8-bit PWM dimming with selectable high-frequency (558 Hz) or low-frequency (256 Hz) operation.
Autonomous operation is enabled via on-chip SRAM program memory supporting lighting sequences without host processor intervention. Synchronization across multiple devices is supported through dedicated CLK_32K input and TRIG I/O, while INT output signals sequence completion. The device uses only four external ceramic capacitors and supports I²C communication at up to 400 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | Three independent R/G/B constant-current outputs with 8-bit current setting (0–25.5 mA) |
| Charge Pump Modes | Auto-selecting 1× (bypass) or 1.5× (boost to 4.5 V typical) based on LED VF headroom |
| Current Matching | ±1% max mismatch between R/G/B channels at 17.5 mA, enabling accurate color mixing |
| Saturation Voltage | 50 mV typical at 17.5 mA - minimizes power loss and thermal rise in LED driver path |
| I²C Address Options | Four pin-selectable addresses (ADDR_SEL0/1) - supports up to four LP5521TMX/NOPB on single bus |
| Supply Current (Standby) | 0.2 µA typical with EN = 0 - enables ultra-low-power system sleep states |
| PWM Frequency | 256 Hz (32-kHz clock sourced) or 558 Hz (internal oscillator) - selectable for flicker-free or low-noise operation |
Pinout & Package
LP5521TMX/NOPB is packaged in a 20-pin DSBGA (YFQ) measuring 2.093 mm × 1.733 mm (max), optimized for space-constrained mobile PCBs. The package features bottom-side ball layout with GND balls for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A (B) | Blue LED current source output | Analog output driving blue LED anode; supports 0–25.5 mA with 100 µA resolution |
| 1B (G) | Green LED current source output | Analog output driving green LED anode; matched to R/B within 1% at nominal current |
| 1C (R) | Red LED current source output | Analog output driving red LED anode; configurable to connect to VDD or VOUT for efficiency optimization |
| 1D (SCL) | I²C clock input | Input for synchronous serial interface; supports up to 400 kHz clock frequency |
| 1E (SDA) | I²C data I/O (open-drain) | Bidirectional data line with internal pull-down; requires external pull-up resistor |
| 2A (VOUT) | Charge pump regulated output | Boosted supply rail (4.5 V typ. in 1.5× mode); powers G/B drivers and optionally R driver |
| 2B (ADDR_SEL1), 2C (ADDR_SEL0) | I²C address select inputs | Two-pin binary encoding selects one of four I²C addresses (0x30–0x33) for multi-device bus |
| 2D (GPO) | General-purpose digital output | Push-pull output capable of driving logic-level loads; usable for system control signaling |
| 2E (EN) | Chip enable input | Active-high hardware enable; must be held high ≥1 ms before I²C communication |
| 3A (CFLY2N), 3B (CFLY1N) | Negative terminals of flying capacitors | Return nodes for two 0.47 µF ceramic fly caps; critical for stable charge pump operation |
| 3C, 4D (GND) | Ground reference pins | Two dedicated ground balls - ensure low-impedance return path for analog and power sections |
| 3D (CLK_32K) | 32-kHz clock input | Accepts external or internal 32-kHz timing reference for synchronized PWM and multi-device operation |
| 3E (INT) | Interrupt / general-purpose output | Open-drain interrupt signal (e.g., sequence end); configurable as push-pull GPO in register mode |
| 4A (CFLY2P), 4B (CFLY1P) | Positive terminals of flying capacitors | Charge pump switching nodes; require 0.47 µF X5R/X7R MLCCs with low ESR |
| 4C (VDD) | Main power supply input | 2.7–5.5 V input powering logic, MCU, and charge pump controller; decoupled with 1 µF CIN |
| 4E (TRIG) | Trigger input/output | Configurable I/O for synchronizing lighting sequences across multiple LP5521TMX/NOPB devices |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive 1×/1.5× charge pump | Automatically switches gain to maintain LED drive efficiency >95% across full battery range (2.7–5.5 V) |
| Autonomous lighting engine | On-chip SRAM program memory executes stored LED sequences without CPU involvement - reduces host load and power |
| RGB current matching | ≤1% max deviation between R/G/B output currents at 17.5 mA - ensures consistent white point and color fidelity |
| Ultra-low standby current | 0.2 µA typical with EN = 0 - extends battery life in always-on indicator applications |
| Flexible I/O synchronization | CLK_32K input + TRIG I/O enable deterministic timing and coordinated multi-device lighting effects |
| No inductor or sense resistors | Four external 0.47–1 µF ceramic capacitors only - eliminates magnetic components and board area for compact designs |
Applications
| Mobile Phone Indicator Lights | Handheld POS Terminal Backlight |
|---|---|
|
Use Scenario: RGB status indicators on smartphone front bezel or notification ring. IC Role / Device Role / Timing Role: LP5521TMX/NOPB drives discrete R/G/B LEDs with synchronized PWM to generate breathing, pulsing, or color-cycle effects. Use Value: Autonomous operation reduces AP processor wake-ups; 1% current matching ensures repeatable color output across units. |
Use Scenario: Dynamic backlight for keypad and display on retail payment terminals. IC Role / Device Role / Timing Role: LP5521TMX/NOPB supplies matched current to RGB LEDs behind translucent keys, enabling brand-color illumination and feedback states. Use Value: Adaptive charge pump maintains brightness over full battery discharge; 50 mV saturation voltage minimizes heat in sealed enclosures. |
| Electronic Access Control Panel | Blood Glucose Meter UI |
|
Use Scenario: Visual status feedback (e.g., green OK, red error, amber pending) on door access keypads. IC Role / Device Role / Timing Role: LP5521TMX/NOPB executes preloaded lighting sequences triggered by microcontroller GPIO or I²C command. Use Value: Four I²C address options allow stacking multiple LP5521TMX/NOPB for multi-zone panels; GPO pin controls auxiliary buzzer or relay. |
Use Scenario: Patient-facing color-coded result display and progress indicators in portable medical diagnostics. IC Role / Device Role / Timing Role: LP5521TMX/NOPB drives high-CRI RGB LEDs to render calibrated color gradients for glucose level visualization. Use Value: 8-bit current + 8-bit PWM resolution enables smooth, flicker-free transitions; 200-nA shutdown current meets stringent medical battery life targets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RGB LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP55231RSBT | Three-channel, same architecture but adds integrated 32-kHz oscillator and enhanced program memory; no external CLK_32K needed | Better suited for systems lacking precision 32-kHz source; higher pin count (24-pin WQFN vs. 20-pin DSBGA) | Select LP55231RSBT if eliminating external clock component is prioritized and board space allows larger package |
| PCA9634PW | I²C 4-channel LED driver with 12-bit PWM only - no charge pump, no autonomous engine, max 25 mA/channel | Requires external boost supply for white/RGB LEDs; relies entirely on host for sequencing; lower integration | Choose PCA9634PW only when cost sensitivity outweighs autonomy and efficiency needs, and external boost is already present |
Compared with LP5521TMX/NOPB, LP55231RSBT offers self-clocked operation and expanded memory but sacrifices the ultra-compact DSBGA footprint, while PCA9634PW provides basic dimming at lower cost but demands full host control and external voltage boosting - making LP5521TMX/NOPB optimal for battery-powered, space-limited, autonomous lighting systems.
Availability
LP5521TMX/NOPB is available at Aetrix Electronics and suitable for mobile phone indicator lights, handheld POS terminal backlighting, electronic access control panels, and blood glucose meter UIs requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LP5521TMX/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 high-reliability silicon solutions for industrial, automotive, and consumer applications.
The LP5521 product line was designed specifically for autonomous, efficient RGB lighting in space-constrained portable electronics - integrating charge pump regulation, programmable current sources, and on-chip sequence execution to minimize host processor overhead.
FAQ
What is the maximum LED current per channel supported by the LP5521TMX/NOPB?
The LP5521TMX/NOPB supports a maximum programmable LED current of 25.5 mA per channel (R, G, or B) using its 8-bit current control register. This value is confirmed in the Electrical Characteristics table (Section 6.7) of the official datasheet, where IMAX is specified as 25.5 mA for all three outputs under recommended operating conditions.
Does the LP5521TMX/NOPB require an external 32-kHz clock to operate?
The LP5521TMX/NOPB can operate with or without an external 32-kHz clock. When CLK_32K is left unconnected or driven low, the device uses its internal oscillator (±4% accuracy) for PWM timing. External 32-kHz input is optional and used primarily for precise synchronization across multiple LP5521TMX/NOPB devices or when higher timing accuracy is required.
How does the LP5521TMX/NOPB achieve autonomous operation?
The LP5521TMX/NOPB achieves autonomous operation via on-chip SRAM program memory that stores lighting sequences compiled using TI's LP55xx Command Compiler. Once loaded, the internal MCU executes instructions independently - controlling PWM, current, and timing without host I²C interaction - reducing system power and freeing the main processor for other tasks.
What is the purpose of the R_TO_BATT bit in the LP5521TMX/NOPB configuration register?
The R_TO_BATT bit (bit 7 in register 08H) configures the red LED channel to draw current directly from VDD instead of VOUT. This improves efficiency when driving low-VF red LEDs with sufficient battery voltage, bypassing the charge pump and eliminating its associated losses - a feature unique to the R channel and not available for G or B outputs.
Can multiple LP5521TMX/NOPB devices share the same I²C bus?
Yes - up to four LP5521TMX/NOPB devices can share a single I²C bus using pin-selectable addresses. ADDR_SEL0 and ADDR_SEL1 inputs configure each device to one of four addresses (0x30–0x33), enabling individual programming and synchronized control without address conflict or additional bus hardware.
LP5521TMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 4.55V
- Current - Output / Channel:
- 25.5mA
- Frequency:
- 1.25MHz
- Dimming:
- I2C
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TuSMD
LP5521TMX/NOPB FAQ
1.How can I place an order for LP5521TMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5521TMX/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 LP5521TMX/NOPB reliable?
The price and inventory of LP5521TMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5521TMX/NOPB is usually 5 days.
3.What payment methods are accepted for LP5521TMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5521TMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5521TMX/NOPB?
LP5521TMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5521TMX/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 LP5521TMX/NOPB?
For technical support, including LP5521TMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5521TMX/NOPB requirements.
6.How does Aetrix verify that LP5521TMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5521TMX/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 LP5521TMX/NOPB meets industry standards.
7.What is the process for return or replacement of LP5521TMX/NOPB?
All LP5521TMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5521TMX/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 LP5521TMX/NOPB part is unused and in its original packaging.
Return procedure for LP5521TMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP5521TMX/NOPB Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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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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