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Texas Instruments LP5521TM/NOPB
- Part No.:
- LP5521TM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA
- Datasheet:
-
LP5521TM/NOPB.pdf
- Description:
- IC LED DRVR RGLTR I2C 20TUSMD
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP5521TM/NOPB from Texas Instruments is a three-channel RGB LED driver IC with integrated adaptive charge pump, programmable current sources (0–25.5 mA/channel), 8-bit PWM control, and autonomous program execution engine. It operates from 2.7 V to 5.5 V, supports I²C interface, and delivers up to 95% LED drive efficiency in mobile indicator lighting applications.
For engineers reviewing the LP5521TM/NOPB datasheet, LP5521TM/NOPB pinout, LP5521TM/NOPB application, or LP5521TM/NOPB equivalent, key selection considerations include its 20-pin DSBGA package, 1×/1.5× charge pump gain switching, 50 mV typical LED saturation voltage, 1% current matching across R/G/B channels, and support for synchronized multi-device lighting sequences via TRIG/CLK_32K.
Technical Context
The LP5521TM/NOPB integrates a pre-regulated switched-capacitor charge pump with automatic 1×/1.5× gain selection based on real-time LED forward voltage monitoring. Its three independent constant-current outputs feature 8-bit current programming (100 µA resolution) and dual-mode PWM (256 Hz or 558 Hz), enabling precise color mixing and dynamic lighting effects without host processor intervention.
Autonomous operation is enabled by on-chip SRAM program memory and three dedicated execution engines. The device uses only four external ceramic capacitors (CIN, COUT, CFLY1, CFLY2), eliminates inductors and current-setting resistors, and enters <200 nA shutdown mode when disabled - making it suitable for battery-constrained portable systems requiring low EMI and minimal solution footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with full Li-ion battery range (3.0–4.2 V) without external regulation |
| LED Output Current | 0–25.5 mA per channel (R/G/B) - 8-bit programmable with 100 µA step resolution for precise brightness control |
| Current Matching | ±1% max deviation - ensures consistent color balance across RGB channels under varying temperature and supply conditions |
| Charge Pump Gain | Auto-switching 1× or 1.5× - maintains regulation at VOUT ≈ 4.5 V (1.5×) or passes VDD directly (1×) based on LED headroom |
| Shutdown Current | 200 nA typical - enables ultra-low-power standby in always-on indicator applications |
| I²C Interface Speed | Up to 400 kHz - supports fast configuration and real-time parameter updates on standard SMBus-compatible buses |
| PWM Frequency Options | 256 Hz (32-kHz clock sourced) or 558 Hz (internal oscillator) - selectable per channel for flicker-free visual effects |
Pinout & Package
LP5521TM/NOPB is housed in a 20-pin DSBGA (Die Size Ball Grid Array) package measuring 2.093 mm × 1.733 mm (maximum). This ultra-compact, bottom-terminal chip-scale package supports high-density PCB layouts and requires no thermal pad or exposed die attach.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| B | Blue LED current source output | Analog output pin sourcing up to 25.5 mA; connected internally to charge pump VOUT unless configured otherwise |
| G | Green LED current source output | Analog output pin sourcing up to 25.5 mA; shares same current accuracy and saturation characteristics as R/B |
| R | Red LED current source output | Analog output pin with configurable connection to VDD or VOUT; supports battery-direct mode for improved efficiency with low-VF red LEDs |
| VOUT | Charge pump regulated output | Provides boosted 4.5 V (typ.) in 1.5× mode; supplies G/B channels and optionally R channel depending on register setting |
| SCL | I²C clock input | Input-only logic pin accepting up to 400 kHz clock; requires external pull-up resistor |
| SDA | I²C data bidirectional line | Open-drain I/O supporting standard I²C protocol; requires external pull-up resistor |
| EN | Chip enable input | Active-high digital input controlling global power state; must be held high ≥1 ms before I²C communication |
| INT | Interrupt / general-purpose output | Open-drain output signaling end-of-program execution or used as GPIO; configurable via register |
| GPO | General-purpose digital output | Push-pull output capable of driving external logic or control signals; independent of LED engine operation |
| TRIG | Trigger input/output | Configurable I/O for synchronizing multiple LP5521 devices; supports edge-triggered start of lighting sequences |
| CLK_32K | 32-kHz clock input | Accepts external 32.768 kHz crystal or oscillator signal to synchronize PWM timing across devices |
| ADDR_SEL0 / ADDR_SEL1 | I²C address select inputs | Two binary inputs selecting one of four I²C addresses (0x30–0x33), enabling up to four devices on single bus |
| CFLY1P / CFLY1N / CFLY2P / CFLY2N | Flying capacitor terminals | Four analog pins connecting two 0.47 µF ceramic capacitors essential for charge pump operation |
| VDD | Main power supply input | Supplies internal logic, MCU, and charge pump input; decoupled with 1 µF ceramic capacitor |
| GND | Ground reference | Two dedicated ground pins (pins 3C and 4D) minimize noise coupling and improve current-source stability |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive 1×/1.5× charge pump | Maintains >90% efficiency across Li-ion voltage range (3.0–4.2 V) while automatically adjusting gain to match LED VF requirements |
| Autonomous lighting engine | Executes stored lighting sequences from on-chip SRAM without CPU involvement - reduces host processor load and system power |
| Three independent PWM channels | Each R/G/B channel supports separate 8-bit current + 8-bit PWM depth control, enabling smooth color transitions and complex waveforms |
| Multi-device synchronization | TRIG and CLK_32K pins allow precise timing alignment of lighting effects across multiple LP5521TM/NOPB units in a single system |
| Low-EMI capacitor-only design | Eliminates inductors and current-sense resistors - uses only four small MLCCs (X5R/X7R) for compact, quiet, and cost-effective implementation |
Applications
| Mobile Indicator Lighting | Keypad RGB Backlighting |
|---|---|
|
Use Scenario: Status indication and aesthetic lighting on smartphones, wearables, and portable medical devices. IC Role / Device Role / Timing Role: RGB LED driver with autonomous program execution and synchronized multi-device timing via TRIG/CLK_32K. Use Value: Enables rich lighting effects (breathing, pulsing, color cycling) using only 200 nA standby current and no host CPU overhead. |
Use Scenario: Dynamic backlighting for alphanumeric keypads in handheld POS terminals and access control panels. IC Role / Device Role / Timing Role: Constant-current RGB driver with 1% current matching and 8-bit PWM resolution for uniform color rendering. Use Value: Delivers consistent brightness and hue across all keys despite varying LED forward voltages and temperature drift. |
| LCD Sub-Display Backlighting | Blood Glucose Meter UI |
|
Use Scenario: Low-power auxiliary display illumination in compact consumer electronics where space and battery life are critical. IC Role / Device Role / Timing Role: Efficient charge-pump-based LED driver operating from single-cell Li-ion supply with minimal external components. Use Value: Achieves >95% LED drive efficiency and eliminates need for inductors - reducing BOM count and EMI emissions. |
Use Scenario: Visual feedback and status indication in Class II medical devices requiring reliable, low-power, and long-life operation. IC Role / Device Role / Timing Role: Autonomous lighting controller with programmable sequences triggered by measurement completion or error states. Use Value: Provides intuitive, color-coded alerts (e.g., green = OK, red = error) using factory-programmed patterns - no firmware update required. |
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 | 24-pin WQFN package; includes additional current-sink channel and enhanced diagnostics; higher thermal resistance (RθJA = 38.4°C/W vs 70.7°C/W) | Preferred for designs needing fourth LED channel or board-level fault reporting; less suitable for ultra-dense mobile layouts | Select LP55231RSBT if fourth LED channel or diagnostic registers are required; LP5521TM/NOPB remains optimal for space-constrained RGB-only use cases. |
| TPS61165DRVR | Single-channel white LED driver with boost converter; no integrated program memory, no RGB support, no I²C interface | Designed for monochrome backlighting only; lacks autonomous sequencing, multi-channel control, and color mixing capability | Choose TPS61165DRVR only for simple WLED applications; LP5521TM/NOPB is not substitutable due to fundamental functional differences in channel count and control architecture. |
Compared with LP55231RSBT, LP5521TM/NOPB offers superior board-area efficiency in DSBGA packaging but lacks diagnostic features; compared with TPS61165DRVR, it provides full RGB autonomy and programmability - making it uniquely suited for intelligent indicator lighting rather than basic backlighting.
Availability
LP5521TM/NOPB is available at Aetrix Electronics and suitable for mobile indicator lighting, keypad RGB backlighting, and LCD sub-display backlighting requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for LP5521TM/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 power management technologies, with decades of experience in precision analog IC design and high-volume manufacturing.
The LP5521TM/NOPB belongs to TI's LP55xx family of autonomous LED drivers, engineered specifically for low-power, visually engaging indicator lighting in space-constrained portable electronics - emphasizing integration, efficiency, and ease of lighting sequence development.
FAQ
What is the maximum LED current supported by LP5521TM/NOPB?
The LP5521TM/NOPB supports up to 25.5 mA per channel (R, G, B) with 8-bit programmable current control. Each channel delivers this current with ±1% matching accuracy and 50 mV typical saturation voltage, ensuring consistent brightness and color fidelity across all three outputs under varying load and temperature conditions.
Does LP5521TM/NOPB require external inductors or current-setting resistors?
No, LP5521TM/NOPB uses an integrated adaptive charge pump and on-chip current sources, eliminating the need for external inductors or discrete current-setting resistors. Only four low-cost ceramic capacitors (CIN, COUT, CFLY1, CFLY2) are required - significantly reducing solution size, cost, and EMI compared to inductor-based LED drivers.
How does LP5521TM/NOPB achieve autonomous operation without a host processor?
LP5521TM/NOPB contains on-chip SRAM program memory and three dedicated execution engines that run preloaded lighting sequences independently. Once programmed via I²C, the device executes patterns (e.g., breathing, color fade) without further host interaction - reducing CPU load and enabling ultra-low-power indicator functionality even during system sleep modes.
Can LP5521TM/NOPB synchronize lighting effects across multiple devices?
Yes, LP5521TM/NOPB supports hardware-level synchronization using the TRIG pin for edge-triggered sequence start and the CLK_32K pin for shared timing reference. These features allow precise alignment of lighting effects across up to four LP5521TM/NOPB devices on the same I²C bus - ideal for multi-zone indicator systems in handheld or wearable products.
What I²C addresses are supported by LP5521TM/NOPB?
LP5521TM/NOPB supports four user-selectable I²C addresses (0x30, 0x31, 0x32, 0x33) determined by the logic levels on ADDR_SEL0 and ADDR_SEL1 pins. This allows up to four LP5521TM/NOPB devices to coexist on a single I²C bus without address conflict - simplifying system-level RGB lighting expansion.
LP5521TM/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
LP5521TM/NOPB FAQ
1.How can I place an order for LP5521TM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5521TM/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 LP5521TM/NOPB reliable?
The price and inventory of LP5521TM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5521TM/NOPB is usually 5 days.
3.What payment methods are accepted for LP5521TM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5521TM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5521TM/NOPB?
LP5521TM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5521TM/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 LP5521TM/NOPB?
For technical support, including LP5521TM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5521TM/NOPB requirements.
6.How does Aetrix verify that LP5521TM/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5521TM/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 LP5521TM/NOPB meets industry standards.
7.What is the process for return or replacement of LP5521TM/NOPB?
All LP5521TM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5521TM/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 LP5521TM/NOPB part is unused and in its original packaging.
Return procedure for LP5521TM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP5521TM/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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