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Texas Instruments LP55271TLX/NOPB
- Part No.:
- LP55271TLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 30-WFBGA
- Datasheet:
-
LP55271TLX/NOPB.pdf
- Description:
- IC LED DRIVER RGLTR 1.7A 30DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP55271TLX/NOPB from Texas Instruments is a lighting management IC integrating a 370-mA flash LED driver, four 15-mA constant-current backlight drivers, and a programmable boost DC-DC converter (4.0–5.4 V output) for camera flash and keypad/display illumination in battery-powered handheld devices. It supports I²C control, audio-synchronized LED1 modulation, and built-in LED connectivity test.
For engineers reviewing the LP55271TLX/NOPB datasheet, LP55271TLX/NOPB pinout, LP55271TLX/NOPB application, or LP55271TLX/NOPB equivalent, key selection criteria include flash current accuracy (±7.5%), torch mode capability (46 mA), 8-bit per-LED brightness control, audio sync gain/AGC configuration, and DSBGA-30 package compatibility with space-constrained mobile designs.
Technical Context
The LP55271TLX/NOPB implements a magnetic CPM (current-programmed mode) boost converter with selectable 1.0 MHz or 2.0 MHz switching frequency (RT = 82 kΩ), overvoltage/overcurrent protection, and soft-start. Its flash driver features hardware/software enable via FLASH_SYNC pin and safety timeout (1.0 s or 2.0 s) to prevent thermal damage.
Four independent 8-bit DAC-controlled LED sinks support per-channel brightness programming (0–15 mA, ±7% tolerance, 1% matching), while LED1 integrates stereo audio input (ASE1/ASE2), digital peak detection, AGC, and programmable threshold (0.2–2.7 V) and refresh rate (3.8–FASTEST Hz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Flash Sink Current | 370 mA ±7.5% - enables high-intensity camera flash with thermal safety cutoff |
| Torch Mode Current | 46 mA - provides continuous illumination for low-power flashlight applications |
| Boost Output Voltage | 4.0–5.4 V in 8 steps - configurable via 4-bit register to match LED forward voltage stack |
| LED Driver Current | 0–15 mA per channel (8-bit DAC, 0.059 mA step) - precise backlight/keypad dimming |
| Audio Sync Inputs | Two single-ended analog inputs (0–1.6 Vpp, 10–15 kΩ impedance) - enables music-reactive LED1 behavior |
| I²C Interface | Standard-mode (400 kHz), VDD_IO = 1.65–VDD1 - compatible with common mobile MCUs |
| Operating Voltage | VDD1/VDD2 = 3.0–5.5 V - supports single-cell Li-ion (3.0–4.5 V) with headroom for boost |
Pinout & Package
LP55271TLX/NOPB uses a 30-pin DSBGA package (2.466 mm × 2.974 mm × 0.60 mm, 0.5 mm pitch), optimized for ultra-thin mobile PCBs with minimal external component count.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1, VDD2 | Main power supply inputs | Accept 3.0–5.5 V; decoupled by 100 nF capacitors for stable core operation |
| SW1, SW2 | Boost converter switch outputs | Drive external inductor (4.7 µH); require low-inductance GND_SW1/GND_SW2 connections |
| FB | Boost feedback node | Monitors regulated output voltage; sets target via internal resistor divider controlled by register |
| LED1–LED4 | Constant-current LED sink outputs | Each drives one LED cathode; current set digitally (0–255) or via audio sync (LED1 only) |
| FLASH | High-current flash LED sink | Sinks up to 370 mA; enabled by FLASH_SYNC pin or I²C register; includes 1/2 s safety timer |
| ASE1, ASE2 | Audio synchronization inputs | Accept stereo analog signals (0–1.6 Vpp); digitized internally for LED1 amplitude tracking |
| SCL, SDA | I²C interface pins | Standard-mode bus (400 kHz); require external pull-ups; support full register read/write access |
| NRST | Active-low reset input | Hardware reset assertion clears all registers; also triggered by internal POR below 1.5 V |
| RT | Oscillator timing resistor | 82 kΩ sets 2.0 MHz boost switching frequency; enables noise spectrum control via pulse-skipping elimination |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost converter | Delivers 4.0–5.4 V at up to 670 mA load without external controller; eliminates need for separate PMIC rail |
| Flash safety circuit | Hardware-enforced 1.0 s or 2.0 s automatic shutdown prevents thermal runaway during stuck-on faults |
| LED connectivity test | Dedicated T1/T2 test interface enables fast open/short detection on all four LED paths without MCU involvement |
| Audio synchronization | Digitally processes ASE1/ASE2 inputs to drive LED1 brightness in real time-no external ADC or DSP required |
| DSBGA-30 footprint | 2.5 mm × 3.0 mm body with 0.5 mm pitch allows placement under camera modules or display bezels |
Applications
| Camera Flash Control | Keypad & Display Backlight |
|---|---|
|
Use Scenario: Smartphone or tablet rear/front camera module requiring synchronized, high-intensity flash pulses with thermal protection. IC Role / Device Role / Timing Role: LP55271TLX/NOPB acts as flash LED driver and timing controller, accepting FLASH_SYNC trigger from baseband processor and enforcing safety timeout. Use Value: Delivers 370 mA flash current with ±7.5% accuracy and automatic 1.0 s cutoff-eliminates risk of LED overheating or battery drain during firmware errors. |
Use Scenario: Mobile device with RGB or white LED keypad illumination and monochrome OLED/LCD display requiring smooth dimming. IC Role / Device Role / Timing Role: LP55271TLX/NOPB serves as quad-channel constant-current sink, driven via I²C to set individual LED brightness (0–15 mA) with 8-bit resolution. Use Value: Achieves 1% current matching across LED1–LED4 and ±7% tolerance-ensures uniform luminance without manual calibration. |
| Audio-Responsive Lighting | Funlight & Status Indication |
|
Use Scenario: Consumer electronics (e.g., Bluetooth speaker, smartwatch) using LED1 to visualize music beat or voice amplitude. IC Role / Device Role / Timing Role: LP55271TLX/NOPB functions as analog front-end + digital signal processor, converting ASE1/ASE2 inputs into real-time LED1 PWM output. Use Value: Supports programmable gain (0 to –46 dB), threshold (0.2–2.7 V), and refresh rate (3.8–FASTEST Hz)-enables robust audio sync across diverse signal levels and noise environments. |
Use Scenario: Portable medical or industrial handheld with status LEDs indicating power, connection, or alert states. IC Role / Device Role / Timing Role: LP55271TLX/NOPB operates as standalone LED driver, using I²C commands to toggle LED2–LED4 ON/OFF or set fixed brightness levels. Use Value: Provides 46 mA torch mode and 15 mA per-channel sinks with <230 mV saturation voltage-minimizes power loss and heat in always-on indicator applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver and flash management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP55231RLVR | 3-channel LED driver (no flash), no audio sync, smaller 20-pin DSBGA, lower max current (25 mA/channel) | Suitable for basic backlight-only systems without camera or audio features | Select when flash/audio functionality is unnecessary and board area is extremely constrained |
| LM3530UMX/NOPB | 6-channel LED driver with I²C, no integrated boost or flash circuit; requires external DC-DC for >3.6 V LEDs | Targeted at LCD backlighting with ambient light sensing-not designed for flash or audio sync | Choose when driving higher-voltage LED strings and system already includes a dedicated boost converter |
Compared with LP55271TLX/NOPB, LP55231RLVR lacks flash and audio capabilities but offers smaller footprint, while LM3530UMX/NOPB provides more LED channels but requires external power conversion and cannot replace LP55271TLX/NOPB's integrated flash safety and synchronization functions.
Availability
LP55271TLX/NOPB is available at Aetrix Electronics and suitable for smartphone camera modules, portable medical device indicators, consumer audio visualizers, and industrial handheld UIs requiring stable component supply and long-term production continuity.
Supply support for LP55271TLX/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 lighting ICs for mobile and portable applications.
The LP55271TLX/NOPB belongs to TI's LP55xx lighting management family, engineered specifically for space-constrained battery-powered devices needing integrated flash, backlight, and audio-responsive lighting in a single chip.
FAQ
What is the maximum flash current supported by the LP55271TLX/NOPB?
The LP55271TLX/NOPB supports a maximum flash sink current of 370 mA with ±7.5% accuracy at VFLASH = 1.0 V. This current is set externally using resistor RF (IFLASH = 480/RF amperes), and the minimum recommended RF value is 1200 Ω to avoid exceeding safe operating limits. The LP55271TLX/NOPB also includes a hardware safety timer that disables the flash after 1.0 s or 2.0 s to prevent thermal damage.
How does the LP55271TLX/NOPB implement audio synchronization for LED1?
The LP55271TLX/NOPB accepts stereo analog inputs on ASE1 and ASE2 (0–1.6 Vpp), digitizes them, applies programmable gain (0 to –46 dB) and optional AGC, detects signal peaks, and maps amplitude to LED1 brightness in real time. Refresh rate (3.8–FASTEST Hz) and threshold (0.2–2.7 V) are configurable via registers. When enabled, LED1 brightness control via I²C is disabled-audio sync takes full control of LED1 output.
Can the LP55271TLX/NOPB drive LEDs requiring more than 5.4 V forward voltage?
No-the LP55271TLX/NOPB's integrated boost converter has a maximum programmable output voltage of 5.4 V (set via 4-bit register). It cannot drive LED strings whose total forward voltage exceeds this limit. For higher-voltage applications, an external boost or buck-boost converter must be used, and the LP55271TLX/NOPB would serve only as the constant-current sink controller-not as the power source.
What package type and dimensions does the LP55271TLX/NOPB use?
The LP55271TLX/NOPB uses a 30-pin DSBGA (Die Size Ball Grid Array) package with dimensions 2.466 mm × 2.974 mm × 0.60 mm and 0.5 mm ball pitch (Package Number YZR0030). This ultra-compact, bottom-terminal package is designed for high-density mobile PCB layouts and requires careful attention to solder paste volume and reflow profile per TI's AN1112 specification.
Does the LP55271TLX/NOPB support I²C clock stretching or multi-master arbitration?
No-the LP55271TLX/NOPB implements a standard-mode I²C slave interface (400 kHz max) without clock stretching or multi-master arbitration support. It acknowledges addresses and data bytes but does not hold SCL low. System designers must ensure the master controls timing strictly and avoids bus contention; the LP55271TLX/NOPB will not participate in arbitration or extend clock cycles.
LP55271TLX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 30-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 5
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 4V ~ 5.4V
- Current - Output / Channel:
- 1.7A (Switch)
- Frequency:
- 1MHz ~ 2MHz
- Dimming:
- -
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 30-DSBGA
LP55271TLX/NOPB FAQ
1.How can I place an order for LP55271TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP55271TLX/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 LP55271TLX/NOPB reliable?
The price and inventory of LP55271TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP55271TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LP55271TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP55271TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP55271TLX/NOPB?
LP55271TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP55271TLX/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 LP55271TLX/NOPB?
For technical support, including LP55271TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP55271TLX/NOPB requirements.
6.How does Aetrix verify that LP55271TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LP55271TLX/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 LP55271TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LP55271TLX/NOPB?
All LP55271TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP55271TLX/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 LP55271TLX/NOPB part is unused and in its original packaging.
Return procedure for LP55271TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP55271TLX/NOPB Tags
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