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Texas Instruments LP3950SL/NOPB
- Part No.:
- LP3950SL/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-WFLGA
- Datasheet:
-
LP3950SL/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 50MA 32TLGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,435
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Product details
Overview
LP3950SL/NOPB from Texas Instruments is a color LED driver IC with integrated audio synchronizer, magnetic DC-DC boost converter, and RGB pattern generator. It delivers programmable 4.1–5.3 V boost output (up to 300 mA), supports amplitude/frequency-based LED-audio sync, and drives two independent RGB LED strings (R1/G1/B1 + R2/G2/B2) via open-drain outputs. Used in cellular phone notification lighting synchronized to ring tones.
For engineers reviewing the LP3950SL/NOPB datasheet, LP3950SL/NOPB pinout, LP3950SL/NOPB application, or LP3950SL/NOPB equivalent, key selection criteria include its dual-mode audio synchronization (single-ended/differential analog input), SPI/I²C interface flexibility, AGC-enabled input signal optimization, 32-pin TLGA package footprint, and programmable boost voltage control via 8-bit register.
Technical Context
The LP3950SL/NOPB integrates a current-programmed mode (CPM) magnetic boost converter with selectable 1.0/1.67/2.0 MHz switching frequency (RT = 82 kΩ default), overvoltage/overcurrent protection, and pulse-skipping elimination for stable light output under light loads. Its audio block accepts ASE (single-ended) or AD1/AD2 (differential) inputs with automatic gain control (AGC) that dynamically adjusts input sensitivity.
RGB control is implemented via software-configurable pattern generation-each of six outputs (R1–B2) supports independent ON/OFF timing, 16-step duty cycle (PWM brightness), and 16-step dimming slope. Interface selection (SPI or I²C) is hardware-defined by IF_SEL, with NRST enabling hardware reset and DME/AMODE pins selecting default sync mode and amplitude/frequency operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Output Voltage | Programmable 4.1–5.3 V in 9 steps via 8-bit register; enables direct drive of RGB LEDs from 3.0–4.5 V Li-ion battery. |
| Max Output Current | 300 mA continuous boost load; sufficient for dual high-brightness RGB strings in mobile applications. |
| Audio Input Support | Single-ended (ASE) or differential (AD1/AD2); AGC tracks input level and auto-adjusts gain for consistent LED response across volume ranges. |
| Interface Options | SPI (4-wire) or I²C (2-wire) with user-selectable address (50h/51h); IF_SEL pin configures protocol at power-up. |
| LED Drive Outputs | Six open-drain outputs (R1/G1/B1/R2/G2/B2); each supports independent PWM dimming, blinking, and fade control. |
| Supply Voltage Range | VDD1/VDD2/VDDA: 2.7–2.9 V; VDDIO: 1.65–VDD1,2 V; ensures compatibility with low-voltage mobile SoCs and PMIC rails. |
| Package | 32-pin TLGA (4.5 × 5.5 × 0.8 mm, 0.5 mm pitch, NPC0032A); space-efficient for thin handheld PCBs. |
Pinout & Package
LP3950SL/NOPB uses a 32-pin Thin Leadless Grid Array (TLGA) package (NPC0032A), 4.5 mm × 5.5 mm × 0.8 mm, 0.5 mm pitch, bottom-exposed thermal pad. Pin numbering follows standard top-view layout with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Boost feedback input | Connects to resistor divider from boost output; sets regulated output voltage with ±5% accuracy. |
| SW | Boost switch node | Open-drain NMOS drain; connects to inductor (L1 = 4.7 µH) and Schottky diode (D1) for magnetic boost topology. |
| R1–B2 (Pins 26–32) | RGB LED drivers | Six independent open-drain outputs; each sinks up to 150 mA; requires external current-limiting resistors per LED. |
| ASE, AD1, AD2 | Analog audio inputs | ASE: single-ended audio path; AD1/AD2: differential pair; all routed to internal AGC and sync engine. |
| IF_SEL, SCK/SCL, SS/SDA, SI, SO | Serial interface | Hardware-selectable SPI (IF_SEL = H) or I²C (IF_SEL = L); supports 8 MHz SPI or 400 kHz I²C (1.8 V) / 200 kHz (1.65 V). |
| DME, AMODE, NRST | Mode control & reset | DME enables default sync mode; AMODE selects amplitude/frequency sync; NRST is active-low hardware reset. |
Key Features
| Feature | Design Value |
|---|---|
| Audio Synchronization Engine | Real-time amplitude- or frequency-based LED modulation from analog audio input; eliminates need for host MCU audio analysis. |
| Magnetic Boost Converter | CPM-controlled, 2.0 MHz default switching (RT = 82 kΩ); includes OV/OC protection, active load, and pulse-skipping elimination for stable light at low load. |
| RGB Pattern Generator | Independent 16-step ON/OFF timing, duty cycle, and slope control per R/G/B channel across two LED strings; matches LP3933/LP3936 behavior. |
| Automatic Gain Control (AGC) | Tracks analog input envelope and dynamically scales gain to maintain consistent LED brightness across varying audio signal levels. |
| Flexible Serial Interface | Pin-selectable SPI or I²C with configurable slave address; reduces firmware complexity versus fixed-protocol alternatives. |
Applications
| Cellular Phone Notification Lighting | MP3 Player Visual Feedback |
|---|---|
Use Scenario: RGB LEDs flash and pulse in time with polyphonic ringtones or music playback on feature phones and early smartphones. IC Role / Device Role / Timing Role: LP3950SL/NOPB acts as autonomous audio-to-light translator-accepting analog audio directly from codec, performing real-time sync, and driving LEDs without CPU intervention. Use Value: Enables rich visual effects using only analog audio signals; reduces host processor load and simplifies BOM by eliminating separate audio processing ICs. |
Use Scenario: Portable MP3 players use synchronized LED patterns to visualize bass/treble content during music playback. IC Role / Device Role / Timing Role: LP3950SL/NOPB processes differential audio inputs (AD1/AD2) to extract frequency-domain features and maps them to RGB intensity profiles. Use Value: Delivers responsive, low-latency visual feedback with no digital audio stream parsing; supports both amplitude tracking (for beat detection) and frequency tracking (for spectral visualization). |
| Toys with Audio-Responsive Lights | Camera Phone Flash Assist |
Use Scenario: Interactive toys light up in rhythm with voice commands or music played through built-in speakers. IC Role / Device Role / Timing Role: LP3950SL/NOPB receives single-ended audio (ASE) from toy's audio amplifier and generates programmable blink/fade sequences tied to signal envelope. Use Value: Provides plug-and-play audio-reactive lighting with minimal external components-no DSP, ADC, or custom firmware required. |
Use Scenario: Dual-mode camera phones use LP3950SL/NOPB to drive flash LEDs during still capture while simultaneously powering notification LEDs. IC Role / Device Role / Timing Role: LP3950SL/NOPB's 300 mA boost converter supplies regulated 5.0 V to flash LEDs; RGB outputs provide UI status lighting during preview mode. Use Value: Integrates flash power management and UI lighting into one IC-reducing component count and PCB area versus discrete boost + LED driver solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar color LED driver with audio synchronization applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP3936TP/NOPB | No integrated audio sync block; lacks ASE/AD1/AD2 inputs and AGC; identical RGB pattern generator and boost architecture. | Suitable only for pre-processed digital trigger signals-not analog audio input. | Select when audio sync is handled externally; retains same footprint and register map for RGB control. |
| LP3933TP/NOPB | Same RGB pattern generator and boost converter; no audio circuitry; smaller 24-pin QFN package; no DME/AMODE/NRST pins. | Targeted at static or MCU-timed LED patterns-not real-time audio-driven effects. | Choose for space-constrained designs where audio sync is unnecessary and board area is critical. |
Compared with LP3950SL/NOPB, LP3936TP/NOPB removes audio functionality but preserves full RGB programming and boost control, while LP3933TP/NOPB further reduces package size and feature set-making both viable alternatives only when audio synchronization is not required.
Availability
LP3950SL/NOPB is available at Aetrix Electronics and suitable for cellular phone UI lighting, portable media player visual feedback, interactive toy design, camera phone flash assist, and audio-responsive embedded lighting requiring stable component supply and long-term production support.
Supply support for LP3950SL/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 connectivity technologies, with decades of experience in power management and interface solutions for mobile and consumer electronics.
The LP3950SL/NOPB belongs to TI's color LED driver product line, designed specifically for audio-synchronized lighting in battery-powered portable devices-emphasizing integration, low quiescent current, and analog-input autonomy.
FAQ
What audio input configurations does the LP3950SL/NOPB support?
The LP3950SL/NOPB supports two analog audio input modes: single-ended via ASE pin, or differential via AD1 and AD2 pins. Internal automatic gain control (AGC) dynamically adjusts input sensitivity to maintain consistent LED response across varying signal amplitudes. Both paths feed the same amplitude- and frequency-synchronization engine, and selection is made in register configuration-not hardware routing.
How is the boost output voltage programmed on the LP3950SL/NOPB?
The LP3950SL/NOPB boost output voltage is set via an 8-bit register (address 0Dh), offering nine precise steps from 4.10 V to 5.30 V in 0.15 V increments. The default value (3Fh) sets 5.00 V. This register controls an internal resistor divider in the FB feedback loop, achieving ±5% output accuracy across 1–300 mA load and 3.0–4.5 V input range.
Can the LP3950SL/NOPB drive flash LEDs in camera applications?
Yes-the LP3950SL/NOPB's magnetic boost converter delivers up to 300 mA at 4.1–5.3 V, sufficient to drive high-current flash LEDs commonly used in camera phone modules. Its thermal shutdown (160°C) and overcurrent protection (800 mA typical SW limit) ensure safe operation during brief flash pulses, and the 2.0 MHz default switching frequency minimizes external component size.
What is the function of the RT pin on the LP3950SL/NOPB?
The RT pin on the LP3950SL/NOPB sets the boost converter's switching frequency by connecting an external resistor-82 kΩ yields the default 2.0 MHz. Alternative values enable 1.67 MHz (01x) or 1.00 MHz (001) via the FREQ_SEL[2:0] register. This resistor also influences minimum pulse width (25 ns typical) and startup behavior, directly affecting efficiency and EMI profile.
Does the LP3950SL/NOPB require external current-setting resistors for its LED outputs?
Yes-each of the six open-drain RGB outputs (R1–B2) requires an external current-limiting resistor between the LED anode and VOUT (boost rail). The LP3950SL/NOPB does not integrate current regulation per channel; instead, it provides PWM-controlled sink capability up to 150 mA per pin, with total device thermal limits governed by θJA = 72°C/W and internal thermal shutdown.
LP3950SL/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-WFLGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 2.9V
- Voltage - Output:
- 5V
- Current - Output / Channel:
- 50mA
- Frequency:
- 2MHz
- Dimming:
- PWM
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TLGA (5.5x4.5)
LP3950SL/NOPB FAQ
1.How can I place an order for LP3950SL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3950SL/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 LP3950SL/NOPB reliable?
The price and inventory of LP3950SL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3950SL/NOPB is usually 5 days.
3.What payment methods are accepted for LP3950SL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3950SL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3950SL/NOPB?
LP3950SL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3950SL/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 LP3950SL/NOPB?
For technical support, including LP3950SL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3950SL/NOPB requirements.
6.How does Aetrix verify that LP3950SL/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3950SL/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 LP3950SL/NOPB meets industry standards.
7.What is the process for return or replacement of LP3950SL/NOPB?
All LP3950SL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3950SL/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 LP3950SL/NOPB part is unused and in its original packaging.
Return procedure for LP3950SL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP3950SL/NOPB Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
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BCR421UFD-7
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