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Texas Instruments LP55231SQX/NOPB
- Part No.:
- LP55231SQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LP55231SQX/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,690
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Product details
Overview
LP55231SQX/NOPB from Texas Instruments is a nine-channel high-side LED driver IC with integrated 1×/1.5× adaptive charge pump, 8-bit current control (25.5 mA full-scale), and 12-bit PWM resolution. It operates from 2.7 V to 5.5 V input and autonomously selects optimal charge-pump gain to drive RGB/WLED arrays in mobile lighting effects, indicator systems, and haptic feedback applications.
For engineers reviewing the LP55231SQX/NOPB datasheet, LP55231SQX/NOPB pinout, LP55231SQX/NOPB application, or LP55231SQX/NOPB equivalent, key selection criteria include its three independent programmable engines, internal SRAM pattern memory, 200-nA standby current, I²C-compatible interface with pin-selectable addresses, and built-in LED open/short detection for battery-powered lighting subsystems.
Technical Context
The LP55231SQX/NOPB integrates three independent program execution engines, each controlling up to nine current-source outputs (D1–D9) with source (high-side) topology. Its adaptive charge pump dynamically switches between 1× and 1.5× gain based on forward voltage demands of D1–D6, while D7–D9 are directly powered from VDD to optimize efficiency for red LED elements in RGB configurations.
It features temperature-compensated PWM dimming across −40°C to +90°C using an on-die thermal sensor and 31 selectable compensation slopes, plus autonomous power-save mode reducing supply current to 10 µA (typical) when outputs are inactive - all managed without host MCU intervention via internal program memory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports full Li-ion battery range without external regulation |
| Max Output Current per Channel | 25.5 mA - sufficient to drive standard RGB LEDs at full brightness |
| PWM Resolution | 12-bit - enables 4096-step smooth dimming for flicker-free lighting effects |
| Current Setting Resolution | 8-bit - allows precise per-channel current calibration across process variation |
| Charge Pump Efficiency | Up to 94% - minimizes power loss during voltage boosting for WLED/RGB strings |
| Standby Current | 200 nA (typical) - extends battery life in always-on indicator or notification modes |
| Operating Temperature | −30°C to +125°C junction - qualified for industrial and automotive cabin ambient environments |
Pinout & Package
LP55231SQX/NOPB is housed in a 24-pin WQFN package (4.0 mm × 4.0 mm, 0.5-mm pitch) with exposed thermal pad (DAP) requiring connection to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+, C1−, C2+, C2− | Flying capacitor terminals | Interface external 0.47 µF ceramic capacitors for charge-pump energy transfer |
| VDD, GND | Main power and ground | Supply input (2.7–5.5 V) and reference return; DAP must be connected to GND |
| EN, SCL, SDA, ASEL0, ASEL1 | I²C control and enable inputs | Enable/disable device; configure four I²C addresses (0x30–0x33); support standard-mode (400 kHz) bus |
| CLK, TRIG, INT | Timing and synchronization | Accept external 32.7-kHz clock; trigger multi-device sync; interrupt MCU on pattern completion |
| D1–D9 | High-side current sources | Programmable 25.5-mA sinks (D1–D6) or VDD-powered sources (D7–D9) for RGB/WLED driving |
| VOUT | Charge pump output | Regulated 1×/1.5× boosted voltage (up to ~4.5 V) for D1–D6; decoupled with 1-µF ceramic |
Key Features
| Feature | Design Value |
|---|---|
| Three independent program engines | Enables concurrent execution of distinct lighting sequences (e.g., keypad + status + haptic) without MCU overhead |
| Internal 96-instruction SRAM memory | Stores lighting patterns locally - eliminates need for continuous host communication during animation playback |
| Adaptive 1×/1.5× charge pump | Maintains >90% efficiency across full input voltage range by selecting optimal gain based on real-time LED VF monitoring |
| Built-in LED open/short detection | Performs automated fault testing and reports results via I²C - reduces BOM count by eliminating external sense resistors |
| Temperature-compensated PWM | Adjusts luminance in real time using on-die thermal sensor and user-configurable slope - preserves color consistency over temperature |
Applications
| Mobile Indicator Lighting | RGB Status Notification |
|---|---|
|
Use Scenario: Smartphone or wearable device status indicators (charging, message, low battery). IC Role / Device Role / Timing Role: High-side current source driving discrete RGB LEDs with synchronized fade/blink patterns. Use Value: Autonomous pattern execution from internal memory reduces host CPU load and enables instant visual feedback even in deep sleep states. |
Use Scenario: Smart speaker or IoT hub with multi-color status ring for voice assistant state indication. IC Role / Device Role / Timing Role: Nine-channel current source enabling independent control of R/G/B segments across multiple zones. Use Value: 12-bit PWM resolution ensures smooth color transitions and eliminates visible stepping in ambient lighting applications. |
| Haptic Feedback Lighting | Electronic Thermostat Display |
|
Use Scenario: Touch-sensitive control panel with LED-illuminated buttons that pulse on press confirmation. IC Role / Device Role / Timing Role: Trigger-synchronized LED driver responding to mechanical or capacitive button events. Use Value: TRIG pin enables deterministic, sub-millisecond LED activation aligned with tactile feedback - enhancing perceived responsiveness. |
Use Scenario: Residential HVAC controller with ambient-light-adaptive backlight and status icons. IC Role / Device Role / Timing Role: Low-quiescent-current LED driver powering WLEDs and RGB indicators under battery backup. Use Value: 200-nA standby current and automatic power-save mode extend coin-cell or supercapacitor backup runtime by >3× versus conventional drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP5523SQX/NOPB | Same 9-channel architecture but lacks internal program memory and temperature compensation; requires continuous I²C host control. | Suitable only for simple static or host-driven PWM applications - not for autonomous lighting sequences. | Select LP5523SQX/NOPB only if pattern complexity is low and MCU resources are available for real-time register updates. |
| LP5562RTER | 12-channel driver with higher 35-mA per-channel capability, integrated 1.5×/2× charge pump, and enhanced diagnostics - no internal SRAM program memory. | Better suited for larger LED arrays (e.g., smart lighting panels) where channel count and current headroom outweigh autonomous operation needs. | Choose LP5562RTER when driving >9 LEDs or requiring >25.5 mA per channel; accept added host firmware complexity for greater flexibility. |
Compared with LP5523SQX/NOPB, LP55231SQX/NOPB adds autonomous pattern execution and thermal compensation at the cost of slightly higher quiescent current in active mode; versus LP5562RTER, it trades channel count and peak current for self-contained lighting intelligence and lower system-level software burden.
Availability
LP55231SQX/NOPB is available at Aetrix Electronics and suitable for mobile indicator lighting, RGB status notification, haptic feedback lighting, electronic thermostat displays, and fire notification systems requiring stable component supply and long-term production continuity.
Supply support for LP55231SQX/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 leadership in precision analog and low-power IC design.
The LP55231SQX/NOPB belongs to TI's LP55xx lighting management family, engineered specifically for autonomous, battery-efficient LED control in space-constrained portable electronics - emphasizing integration, thermal resilience, and minimal host dependency.
FAQ
What is the maximum number of LEDs the LP55231SQX/NOPB can drive simultaneously?
The LP55231SQX/NOPB supports up to nine independent LED channels (D1–D9), each configurable as a high-side current source. D1–D6 are driven from the internal charge pump (VOUT), while D7–D9 connect directly to VDD - enabling simultaneous drive of three full RGB LEDs or mixed RGB/WLED configurations without external components. All nine channels operate concurrently under autonomous program control.
Does the LP55231SQX/NOPB require an external microcontroller to function?
No - the LP55231SQX/NOPB contains 96 instructions of internal SRAM program memory and three independent execution engines, allowing it to run preloaded lighting sequences autonomously. While I²C communication is required for initial programming and configuration, once loaded, the LP55231SQX/NOPB executes patterns without host MCU involvement, entering ultra-low-power standby (10 µA typical) between cycles.
How does the LP55231SQX/NOPB handle thermal drift in LED brightness?
The LP55231SQX/NOPB integrates an on-die temperature sensor and applies linear PWM duty-cycle compensation across −40°C to +90°C. Users select one of 31 predefined slopes via register configuration to match their LED's thermal luminance profile. Compensation activates either continuously or only after wake-up from power-save mode to avoid self-heating artifacts - preserving consistent color and intensity over operating temperature.
What protection features are built into the LP55231SQX/NOPB?
The LP55231SQX/NOPB includes overcurrent and short-circuit protection on all nine output channels, thermal shutdown (engages at TJ ≈ 150°C), and built-in LED open/short detection. The latter performs automated VF measurement and fault reporting via I²C, eliminating need for external test circuitry. Charge pump soft-start prevents inrush current, and internal logic ensures safe state transitions during enable/disable sequencing.
Can the LP55231SQX/NOPB synchronize with other LED drivers in a multi-chip system?
Yes - the LP55231SQX/NOPB features a dedicated TRIG input pin that accepts external synchronization pulses, enabling precise timing alignment across multiple LP55231SQX/NOPB devices. Combined with its interrupt (INT) output, this allows coordinated lighting effects (e.g., cascading animations across display edges) without inter-chip I²C traffic or master-slave clock distribution complexity.
LP55231SQX/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)
LP55231SQX/NOPB FAQ
1.How can I place an order for LP55231SQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP55231SQX/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 LP55231SQX/NOPB reliable?
The price and inventory of LP55231SQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP55231SQX/NOPB is usually 5 days.
3.What payment methods are accepted for LP55231SQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP55231SQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP55231SQX/NOPB?
LP55231SQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP55231SQX/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 LP55231SQX/NOPB?
For technical support, including LP55231SQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP55231SQX/NOPB requirements.
6.How does Aetrix verify that LP55231SQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LP55231SQX/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 LP55231SQX/NOPB meets industry standards.
7.What is the process for return or replacement of LP55231SQX/NOPB?
All LP55231SQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP55231SQX/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 LP55231SQX/NOPB part is unused and in its original packaging.
Return procedure for LP55231SQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP55231SQX/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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