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Texas Instruments LP3954TL/NOPB
- Part No.:
- LP3954TL/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 36-WFBGA, DSBGA
- Datasheet:
-
LP3954TL/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 36DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:222
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Product details
Overview
LP3954TL/NOPB from Texas Instruments is an advanced lighting management unit (LMU) for handheld devices, integrating a high-efficiency boost DC-DC converter (4.0–5.3 V output), six constant-current white LED drivers (0–25 mA/LED), two RGB LED driver banks (up to 40 mA/LED each), and a 300 mA flash LED driver. It supports audio-synchronized RGB lighting, command-based pattern generation, and SPI/I²C control - deployed in cellular phone main/sub backlights, keypad illumination, and camera flash subsystems.
For engineers reviewing the LP3954TL/NOPB datasheet, LP3954TL/NOPB pinout, LP3954TL/NOPB application, or LP3954TL/NOPB equivalent, key selection considerations include its dual-mode RGB control (audio sync + programmable pattern generator), integrated 8-bit current programming per WLED channel, thermal shutdown protection at 160°C, and DSBGA-36 package compatibility with space-constrained mobile PCB layouts.
Technical Context
The LP3954TL/NOPB implements a magnetic CPM (current-programmed mode) boost converter with selectable switching frequencies (1/1.67/2 MHz via RT resistor), active load circuitry to suppress pulse skipping at light loads, and overvoltage/overcurrent/feedback-break protections. Its RGB timing engine features an independent 8-command, 16-bit programmable pattern generator with logarithmic intensity control (3-bit per color), CET (197–3146 ms) and TT (0–3539 ms) registers, and loop capability.
White LED drivers operate in 4+2 or 6-channel configuration with 8-bit programmable current (0–25 mA/LED), while RGB outputs support constant-current sink mode (externally set IMAX via RRGB = 5.6 kΩ → 22 mA max) or switch mode with external ballast resistors. Audio synchronization uses single-ended ASE input referenced to VDDA (2.72–2.88 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Output Voltage | Programmable 4.0–5.3 V in 9 steps; enables driving series-connected white LEDs from 3.0–4.5 V Li-ion battery. |
| WLED Driver Current | 0–25 mA per channel across 6 outputs; supports 4+2 or full 6-channel backlight dimming with 8-bit resolution. |
| RGB Driver Current | Up to 40 mA per R/G/B output (2 banks × 3 channels); IMAX set by external RRGB resistor (e.g., 5.6 kΩ → 22 mA). |
| Flash Driver Current | 300–400 mA peak output; controlled via IFLASH resistor and EN_FLASH logic input for camera flash sequencing. |
| Interface | SPI/I²C-compatible dual-mode serial interface (IF_SEL pin selects protocol); supports register read/write at up to 1 MHz SCK. |
| Thermal Protection | Internal thermal shutdown engages at TJ ≈ 160°C and releases at ≈ 140°C; junction-to-ambient θJA = 60°C/W (DSBGA package). |
| Supply Range | VDD1/VDD2: 2.7–5.5 V (external LDO) or 3.0–5.5 V (internal LDO); VDDIO: 1.65 V to VDD1; VDDA: 2.72–2.88 V (analog LDO). |
Pinout & Package
LP3954TL/NOPB uses a 36-ball DSBGA package (3.0 × 3.0 × 0.6 mm, 0.5 mm pitch), available in YZR0036AAA (0.6 mm height) or YPG0036AAA (0.65 mm height) variants. The package supports fine-pitch routing for ultra-compact mobile designs and requires no external heatsink under typical 300 mA load conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Boost Power Switch Output | Drives external inductor (L1 = 4.7 µH); handles up to 900 mA peak switch current. |
| FB | Boost Feedback Input | Resistor-divider input setting output voltage; open-circuit triggers feedback-break protection. |
| FLASH | High-Current Flash Output | Direct drive output for camera flash LED; sinks up to 400 mA with external IFLASH resistor bias. |
| R1, G1, B1 / R2, G2, B2 | RGB LED Sink Outputs | Constant-current sinks for two independent RGB LED sets; each bank configurable as CC or switch mode. |
| WLED1–WLED6 | White LED Sink Outputs | 6-channel constant-current outputs supporting 4+2 or 6-channel backlight configurations. |
| ASE | Audio Sync Analog Input | Single-ended analog input (0.1–VDDA−0.1 V) for synchronizing RGB patterns to audio waveform envelope. |
| SCK/SCL, SS/SDA, SI, SO | Serial Interface Signals | Configurable SPI (4-wire) or I²C (2-wire) interface; IF_SEL pin selects protocol at power-up. |
| VDDA | Analog LDO Output | Internally regulated 2.8 V supply (±3%) for oscillator, ADC, and analog blocks; not intended for external use. |
Key Features
| Feature | Design Value |
|---|---|
| Command-Based Pattern Generator | 8 independent 16-bit commands with programmable intensity (logarithmic 3-bit/color), CET (197–3146 ms), and TT (0–3539 ms) enable rich, autonomous lighting effects without MCU intervention. |
| Audio Synchronization Engine | Dedicated ASE input and internal envelope detector allow real-time RGB pulsing synchronized to music or voice, eliminating need for external ADC or DSP processing. |
| Adaptive Boost Converter | CPM topology with active load and pulse-skipping suppression ensures stable 2 MHz operation down to 1 mA load; efficiency >80% at 100 mA with autoload enabled. |
| Flexible Current Programming | Per-channel 8-bit WLED current control (0–25 mA) and dual-bank RGB current scaling (0.25× to 1.00× IMAX) enable precise brightness matching across display and indicator LEDs. |
| Integrated Sensing Support | Internal ADC interfaces ambient light (via RRT) and temperature (via IRT) sensors; reference voltage (VREF = 1.23 V) supports external sensor biasing. |
Applications
| Cellular Phone Main Backlight | Camera Flash Control |
|---|---|
|
Use Scenario: Driving 6-series white LEDs for LCD backlight in smartphones with dynamic dimming and fade-in/fade-out transitions. IC Role / Device Role / Timing Role: Constant-current WLED driver with 8-bit per-channel current control and automatic fade timing; powered by integrated boost converter. Use Value: Eliminates need for external PWM dimming IC and discrete boost controller, reducing BOM count by ≥3 components while enabling smooth 0–100% brightness ramping. |
Use Scenario: Delivering high-current pulsed output to xenon or high-brightness LED flash during image capture. IC Role / Device Role / Timing Role: High-current sink driver (300–400 mA) with EN_FLASH logic enable and IFLASH-set current limit; synchronized to camera shutter signal. Use Value: Provides precise flash duration control and current regulation without external MOSFET driver or current-sense amplifier, improving exposure consistency. |
| RGB Keypad Illumination | Audio-Responsive Indicator Lighting |
|
Use Scenario: Illuminating multi-color keypad buttons with user-selectable static or animated color schemes. IC Role / Device Role / Timing Role: Dual-bank RGB driver (R1/G1/B1 + R2/G2/B2) with independent 8-bit current scaling and direct ON/OFF control via register bits. Use Value: Enables individual button color tuning and simultaneous multi-color animation using internal pattern generator - no host MCU timing overhead. |
Use Scenario: Visual feedback for media playback, where LED colors pulse rhythmically with bass/treble content. IC Role / Device Role / Timing Role: Audio synchronization frontend (ASE input) coupled with RGB pattern generator to map audio envelope amplitude to LED intensity and transition timing. Use Value: Achieves real-time LED-audio correlation with <5 ms latency using on-chip analog front-end, avoiding software-based FFT or envelope detection delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lighting management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DRVR | Single-channel WLED driver with 1.2 MHz boost; no RGB control, audio sync, or pattern generator. | Limited to monochrome backlight; lacks multi-LED bank management and autonomous lighting effects. | Choose for cost-sensitive, single-backlight-only designs where RGB/audio features are unnecessary. |
| LM3530UMX/NOPB | I²C-controlled 4-channel WLED driver with ambient light sensing; no flash driver, RGB outputs, or audio sync. | Supports only white LED dimming with ALS feedback; no color LED or high-current flash capability. | Select when ambient-light adaptive backlighting is primary requirement and RGB/flash are handled separately. |
Compared with TPS61165DRVR and LM3530UMX/NOPB, LP3954TL/NOPB uniquely integrates white LED backlighting, dual RGB banks, camera flash, audio sync, and autonomous pattern generation in one DSBGA package - reducing system-level complexity for feature-rich handheld UI lighting.
Availability
LP3954TL/NOPB is available at Aetrix Electronics and suitable for cellular phone backlighting, camera flash subsystems, and audio-responsive indicator lighting requiring stable component supply and long-term production continuity.
Supply support for LP3954TL/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 digital signal technologies, with decades of expertise in power management and portable electronics solutions.
The LP3954TL/NOPB belongs to TI's Advanced Lighting Management Unit product line, designed specifically for integration of backlight, indicator, and flash functions in space- and power-constrained handheld devices.
FAQ
What is the maximum total current the LP3954TL/NOPB boost converter can deliver?
The LP3954TL/NOPB boost converter supports up to 300 mA continuous load current at VOUT = 5 V and VIN ≥ 3.0 V, with peak capability of 400 mA at VOUT = 4 V. This rating assumes proper thermal design and use of recommended external components (L1 = 4.7 µH, COUT = 10 µF). Exceeding 300 mA under worst-case conditions may trigger thermal shutdown.
How does the LP3954TL/NOPB implement audio synchronization without an external ADC?
The LP3954TL/NOPB includes a dedicated single-ended analog front-end on the ASE pin that performs envelope detection internally. When an audio signal is applied to ASE (0.1–VDDA−0.1 V range), the device extracts amplitude variations and maps them directly to RGB LED intensity and transition timing - eliminating need for external ADC, amplifier, or firmware-based signal processing.
Can the LP3954TL/NOPB drive both WLED and RGB LEDs simultaneously?
Yes, the LP3954TL/NOPB concurrently drives up to six white LEDs (WLED1–WLED6) and two RGB LED banks (R1/G1/B1 and R2/G2/B2) using independent current control paths. Its integrated boost converter supplies power to all outputs, and register-level enable/disable controls allow selective activation of WLED, RGB1, RGB2, or FLASH channels without interference.
What package variants are available for the LP3954TL/NOPB?
The LP3954TL/NOPB is offered exclusively in a 36-ball DSBGA package with 0.5 mm pitch, in two height variants: YZR0036AAA (3.0 × 3.0 × 0.6 mm) and YPG0036AAA (3.0 × 3.0 × 0.65 mm). Both variants share identical pinout and thermal performance (θJA = 60°C/W) and are RoHS-compliant and lead-free.
Does the LP3954TL/NOPB support external PWM dimming for white LEDs?
Yes, the LP3954TL/NOPB supports external PWM dimming for white LEDs via the SYNC/PWM pin (Pin 4D). When configured in external PWM mode (using wled1-4_pwm and wled5-6_pwm bits in Ext. PWM Control register 07H), the device modulates WLED1–WLED6 outputs directly with incoming PWM signals up to 1 kHz - enabling precise brightness control independent of internal register settings.
LP3954TL/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 36-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 13
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 4V ~ 5.3V
- Current - Output / Channel:
- 900mA (Switch)
- Frequency:
- 2MHz
- Dimming:
- PWM
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-DSBGA
LP3954TL/NOPB FAQ
1.How can I place an order for LP3954TL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3954TL/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 LP3954TL/NOPB reliable?
The price and inventory of LP3954TL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3954TL/NOPB is usually 5 days.
3.What payment methods are accepted for LP3954TL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3954TL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3954TL/NOPB?
LP3954TL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3954TL/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 LP3954TL/NOPB?
For technical support, including LP3954TL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3954TL/NOPB requirements.
6.How does Aetrix verify that LP3954TL/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3954TL/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 LP3954TL/NOPB meets industry standards.
7.What is the process for return or replacement of LP3954TL/NOPB?
All LP3954TL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3954TL/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 LP3954TL/NOPB part is unused and in its original packaging.
Return procedure for LP3954TL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP3954TL/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
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
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