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Texas Instruments LP55231SQE/NOPB
- Part No.:
- LP55231SQE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LP55231SQE/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,985
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Product details
Overview
LP55231SQE/NOPB from Texas Instruments is a nine-channel, high-efficiency RGB and white-LED driver IC with integrated 1×/1.5× adaptive charge pump, 8-bit current control (25.5 mA full-scale), 12-bit PWM resolution, and on-chip program memory for autonomous lighting effects - used in mobile indicator lights, fun lighting, and haptic feedback systems.
For engineers reviewing the LP55231SQE/NOPB datasheet, LP55231SQE/NOPB pinout, LP55231SQE/NOPB application, or LP55231SQE/NOPB equivalent, key selection considerations include its source (high-side) LED drivers, I²C-compatible interface with address select pins, interrupt and trigger synchronization capability, and power-save mode drawing only 10 µA typical supply current when idle.
Technical Context
The LP55231SQE/NOPB integrates three independent program execution engines, each capable of running preloaded lighting sequences without MCU intervention. Its adaptive charge pump autonomously selects 1× or 1.5× gain based on forward voltage demands of D1–D6, while D7–D9 are directly powered from VDD to optimize efficiency for red LEDs in RGB configurations.
It features built-in LED open/short detection, temperature-sensing with 31 programmable compensation slopes (−40°C to +90°C), and a 32-kHz clock input (or internal oscillator) for precise timing control. The device supports flexible grouping of up to nine outputs across engines and provides real-time LED voltage measurement via its test function.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 9 independent high-side current sources (D1–D9), with D7–D9 powered directly from VDD |
| Max output current | 25.5 mA per channel, set via 8-bit register - enables precise brightness control across diverse LED types |
| PWM resolution | 12-bit (4096 steps) - delivers smooth dimming and flicker-free visual transitions in lighting effects |
| Charge pump modes | Adaptive 1×/1.5× fractional switching - maintains >93% LED drive efficiency and up to 94% charge pump efficiency over 2.7–5.5 V input range |
| Supply current (idle) | 10 µA typical in power-save mode - critical for battery-powered devices requiring ultra-low standby consumption |
| I²C interface | Standard-mode (400 kHz) compatible with four pin-selectable addresses (ASEL0/ASEL1) - simplifies multi-device bus design |
| Thermal protection | Internal thermal shutdown at TJ ≈ 150°C, with hysteresis (re-enable at ≈130°C) - ensures robust operation under sustained load |
Pinout & Package
LP55231SQE/NOPB is housed in a 24-pin WQFN package (4.00 mm × 4.00 mm) with exposed thermal pad (DAP) that must be connected to GND for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C2+) | Flying capacitor 2 positive terminal | Connects to positive side of external C2 (0.47 µF); essential for 1.5× charge pump operation |
| 2 (C1+) | Flying capacitor 1 positive terminal | Connects to positive side of external C1 (0.47 µF); forms dual-capacitor charge pump stage |
| 3 (VDD) | Main power supply input | 2.7–5.5 V input powering logic, internal oscillator, and D7–D9 LED drivers directly |
| 4 (GND) | Ground reference | Common return path for all analog/digital circuits and thermal pad connection point |
| 5 (EN) | Enable input | Active-high digital enable; controls global device power-up and wake-from-standby sequence |
| 7 (INT) | Open-drain interrupt output | Signals microcontroller upon completion of programmed lighting sequence or error event |
| 8 (SDA) | I²C data line (bidirectional, open-drain) | Supports standard-mode I²C communication; requires external pull-up resistor |
| 9 (SCL) | I²C clock input | Drives serial interface timing; accepts 400 kHz max clock frequency |
| 10 (TRIG) | Trigger input/output | Synchronizes multiple LP55231 devices or initiates pattern execution externally |
| 11–19 (D9–D1) | Current source outputs | High-side constant-current drivers; D1–D6 driven by VOUT, D7–D9 sourced from VDD |
| 20–21 (ASEL0/ASEL1) | I²C address select inputs | Set one of four I²C slave addresses (0x30–0x33) - enables multi-device bus configuration |
| 22 (VOUT) | Charge pump regulated output | Delivers up to 4.5 V (1.5× mode) to D1–D6; includes soft-start and overcurrent protection |
| 23–24 (C2−/C1−) | Flying capacitor negative terminals | Complete flying capacitor loop; must be routed with low-inductance, short traces |
Key Features
| Feature | Design Value |
|---|---|
| Three independent program engines | Enables concurrent execution of distinct lighting sequences (e.g., keypad backlight + status indicator + haptic pulse) without MCU overhead |
| Autonomous adaptive charge pump | Selects 1× or 1.5× gain in real time based on D1–D6 forward voltage - sustains >90% efficiency across full Li-ion battery range (2.7–4.2 V) |
| Built-in LED test function | Measures VF of individual LEDs or system voltages (VDD, VOUT, INT) - supports battery monitoring and fault diagnostics |
| Temperature compensation | 31 programmable linear PWM slope options - corrects luminance drift over −40°C to +90°C, minimizing color shift in RGB applications |
| Ultra-low-power standby | 10 µA typical IVDD in power-save mode - extends battery life in always-on indicator and notification systems |
Applications
| Mobile Indicator Lighting | RGB Fun Lighting |
|---|---|
|
Use Scenario: Status indication on smartphones, tablets, and wearables using discrete RGB LEDs for charging, notifications, or ambient lighting. IC Role / Device Role / Timing Role: High-side current driver with autonomous pattern execution - manages color blending, fade transitions, and pulsing without continuous MCU involvement. Use Value: Reduces host processor load and firmware complexity while enabling rich visual feedback with <25.5 mA/channel precision and 12-bit PWM smoothness. |
Use Scenario: Decorative lighting in consumer electronics such as gaming peripherals, smart speakers, and IoT hubs with synchronized multi-color effects. IC Role / Device Role / Timing Role: Programmable lighting engine with TRIG synchronization - coordinates timing across multiple LP55231 devices for phase-aligned animations. Use Value: Enables complex, coordinated light shows using on-chip memory and three independent engines - eliminates need for external timing controllers or large code footprints. |
| Haptic Feedback Illumination | Electronic Lock/Thermostat UI |
|
Use Scenario: Visual confirmation during tactile button press in automotive infotainment, industrial HMI, or smart home controls. IC Role / Device Role / Timing Role: Fast-response current source with interrupt-driven completion signaling - triggers LED flash precisely aligned with mechanical actuation. Use Value: Achieves sub-100 µs VOUT turn-on time and <2.3 µA standby current - delivers immediate visual response while preserving battery life in intermittent-use interfaces. |
Use Scenario: Status and mode indication in battery-powered electronic locks, thermostats, and security panels requiring long-term reliability and low maintenance. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with open/short detection and thermal shutdown - monitors LED health and prevents thermal runaway in enclosed enclosures. Use Value: Integrates LED test, temperature compensation, and overcurrent protection - reduces BOM count and improves field reliability without external supervision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP5523SQE/NOPB | Same 9-channel architecture but lacks internal program memory - requires continuous I²C command stream from host MCU | Suitable for designs where lighting patterns are dynamically generated rather than preloaded | Choose LP5523SQE/NOPB if deterministic host-controlled sequencing is preferred over autonomous operation |
| LP5562RTER | 12-channel, higher integration (integrated LDO, enhanced diagnostics), no TRIG pin, different pinout and memory structure | Better suited for larger LED arrays and safety-critical UIs requiring redundant fault reporting | Choose LP5562RTER when scaling beyond 9 channels or requiring integrated power regulation and advanced LED health monitoring |
Compared with LP5523SQE/NOPB, the LP55231SQE/NOPB adds autonomous pattern execution and reduces host dependency; versus LP5562RTER, it offers smaller footprint and lower cost for compact 9-LED implementations without LDO requirements.
Availability
LP55231SQE/NOPB is available at Aetrix Electronics and suitable for mobile indicator lighting, RGB fun lighting, and haptic feedback applications requiring stable component supply, consistent parametric performance, and long-term production support.
Supply support for LP55231SQE/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 expertise in LED driver innovation and high-reliability mixed-signal IC design.
The LP55231SQE/NOPB belongs to TI's LP55xx lighting management family, engineered specifically for energy-efficient, autonomous RGB/WLED control in space-constrained portable electronics - emphasizing low quiescent current, integrated power conversion, and programmable visual effects.
FAQ
What is the primary function of the LP55231SQE/NOPB in an LED lighting system?
The LP55231SQE/NOPB serves as a fully integrated, nine-channel high-side LED driver with adaptive charge pump and on-chip program memory. It autonomously executes lighting sequences - including fades, blinks, and color transitions - without continuous MCU intervention. Its core function is to deliver precise, efficient, and synchronized current to RGB or white LEDs in battery-powered devices like smartphones and wearables, while minimizing host processor overhead and power consumption.
How does the LP55231SQE/NOPB manage power efficiency across varying input voltages?
The LP55231SQE/NOPB maintains high efficiency through its adaptive 1×/1.5× fractional charge pump, which monitors the forward voltage requirements of D1–D6 and automatically selects the optimal gain mode. At higher input voltages (e.g., ≥3.6 V), it operates in 1× mode to minimize losses; at lower voltages (e.g., ≤3.3 V), it switches to 1.5× mode to sustain sufficient headroom for LED driving. D7–D9 are powered directly from VDD to avoid unnecessary charge pump loading - collectively achieving up to 94% charge pump and 93% LED drive efficiency.
Can the LP55231SQE/NOPB drive both RGB and white LEDs simultaneously?
Yes, the LP55231SQE/NOPB is explicitly designed for simultaneous RGB and white LED driving. Its nine outputs support flexible allocation: D1–D6 typically drive green/blue elements (via VOUT), while D7–D9 - powered directly from VDD - are optimized for red LEDs (lower VF) and white LEDs. This architecture avoids overloading the charge pump with red LED forward voltage drops and enables efficient, independent control of all three RGB primaries plus supplemental white illumination in a single IC.
What role does the TRIG pin play in multi-device synchronization with the LP55231SQE/NOPB?
The TRIG pin on the LP55231SQE/NOPB enables hardware-level synchronization between multiple devices. When asserted (e.g., by a shared GPIO or clock edge), it initiates pattern execution across all connected LP55231SQE/NOPB units simultaneously - ensuring frame-accurate alignment of lighting effects. This eliminates software-induced timing jitter and supports scalable, coordinated visual systems in products like multi-zone smart lighting or synchronized gaming accessories.
Does the LP55231SQE/NOPB include diagnostic capabilities for LED health monitoring?
Yes, the LP55231SQE/NOPB incorporates comprehensive LED diagnostics via its built-in test function. It detects open-circuit and short-circuit faults on any output channel and can measure forward voltage (VF) of individual LEDs. Additionally, it supports voltage measurements on VDD, VOUT, and the INT pin - enabling battery voltage monitoring or use of the INT pin as a light sensor input. All test results are accessible through the I²C interface, providing actionable feedback for system-level fault handling and predictive maintenance.
LP55231SQE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 9
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 25.5mA
- Frequency:
- 1.25MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
LP55231SQE/NOPB FAQ
1.How can I place an order for LP55231SQE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP55231SQE/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 LP55231SQE/NOPB reliable?
The price and inventory of LP55231SQE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP55231SQE/NOPB is usually 5 days.
3.What payment methods are accepted for LP55231SQE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP55231SQE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP55231SQE/NOPB?
LP55231SQE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP55231SQE/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 LP55231SQE/NOPB?
For technical support, including LP55231SQE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP55231SQE/NOPB requirements.
6.How does Aetrix verify that LP55231SQE/NOPB is sourced from the original manufacturer or authorized distributors?
All LP55231SQE/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 LP55231SQE/NOPB meets industry standards.
7.What is the process for return or replacement of LP55231SQE/NOPB?
All LP55231SQE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP55231SQE/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 LP55231SQE/NOPB part is unused and in its original packaging.
Return procedure for LP55231SQE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP55231SQE/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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