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Texas Instruments LP8556SQE-E08/NOPB
- Part No.:
- LP8556SQE-E08/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LP8556SQE-E08/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 25MA 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:225
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Product details
Overview
LP8556SQE-E08/NOPB from Texas Instruments is a high-efficiency white LED backlight driver IC featuring an asynchronous boost converter and four precision current sinks for tablet LCD applications. It operates with 2.7–20 V input, delivers up to 43 V boost output, supports 312/625/1250 kHz switching frequencies, and provides PWM + I²C brightness control with adaptive dimming.
For engineers reviewing the LP8556SQE-E08/NOPB datasheet, LP8556SQE-E08/NOPB pinout, LP8556SQE-E08/NOPB application, or LP8556SQE-E08/NOPB equivalent, key selection considerations include its 4-channel configuration, 20-pin DSBGA package, integrated 0.19-Ω MOSFET, programmable OVP thresholds, and phase-shifted PWM for audible noise reduction in portable display systems.
Technical Context
The LP8556SQE-E08/NOPB implements adaptive output voltage control to dynamically minimize VBOOST-reducing power loss across the LED string while maintaining sufficient headroom. Its CPM (current-programmed mode) boost controller uses internal 20-MHz oscillator-derived timing and supports three fixed switching frequencies set via EPROM (E08 variant) or external resistor.
This variant integrates six current-sink channels but configures only four active per device option; it combines analog current-setting (via RISET) with digital I²C register control and hardware PWM dimming up to 15-bit resolution. Fault protection includes UVLO, TSD, OCP, six-level OVP, and LED open/short detection-all implemented in silicon without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 20 V - powers directly from multi-cell Li-ion battery or regulated DC supply; LDO input stage enables stable internal biasing. |
| Boost Output Range | 7 V to 43 V - supports 3–12 series-connected WLEDs per channel; adaptive control minimizes power dissipation. |
| Switching Frequencies | 312 / 625 / 1250 kHz - selectable via EPROM; higher frequencies allow smaller magnetics and reduced EMI filtering area. |
| LED Channel Count | 4 channels - configured at factory (E08 option); each sink delivers up to 50 mA with ±3% accuracy at 23 mA. |
| Dimming Control | PWM + I²C - hardware PWM accepts 75 Hz–25 kHz signals; I²C enables 15-bit resolution and adaptive dimming algorithm. |
| OVP Thresholds | 6 programmable levels - digitally configurable overvoltage protection prevents LED string overvoltage during fault or startup transients. |
| Package | 20-pin DSBGA (2.401 mm × 1.74 mm) - ultra-compact footprint optimized for thin tablet bezels and tight PCB layouts. |
Pinout & Package
LP8556SQE-E08/NOPB uses a 20-pin, 0.4-mm pitch DSBGA package (YFQ) with bottom-side ball layout. Thermal performance is enhanced by exposed die pad (DAP) connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Drain of integrated MOSFET | Connects to boost inductor; handles peak currents up to 1.8 A; requires low-inductance routing to minimize ringing. |
| GND_SW | Source of integrated MOSFET | Dedicated power ground return for switch node; must be tied to main GND plane with minimal impedance. |
| VDD | LDO input supply | Primary power input (2.7–20 V); feeds internal regulator generating VLDO = 3.0 V ±5% for core logic. |
| VBOOST | Boost output feedback node | Monitored for OVP and adaptive voltage regulation; connects to output capacitor bank near pin. |
| LED1–LED4 | Current sink outputs | Four active LED current sinks (E08 variant); each sinks up to 50 mA with <0.5% matching between channels. |
| PWM | Hardware dimming input | Accepts 75 Hz–25 kHz PWM signal; 1 μs min pulse width enables fine-grained brightness control. |
| SCL / SDA | I²C interface pins | Support standard-mode (100 kHz) and fast-mode (400 kHz) I²C; enable register-based configuration and status readback. |
| EN / VDDIO | Enable + I/O reference | Active-high chip enable; also supplies 1.62–3.6 V reference for PWM, SCL, SDA logic levels. |
| FSET | Frequency programming | Unused in E08 (EPROM-configured); left floating; not required for fixed-frequency operation. |
| ISET | Current setting reference | Connects to RISET resistor to set nominal LED current; enables analog trimming independent of digital control. |
| VLDO | LDO output | 3.0 V ±5% regulated output; decoupled with 10 μF CVLDO capacitor for stable internal biasing. |
| GND | Ground reference | Multiple GND balls (A3/B3/D3/E3/D4) provide low-impedance return path for analog, digital, and power domains. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST control | Reduces boost voltage to minimum required level per LED string forward voltage, cutting power loss by up to 30% vs fixed-output designs. |
| Phase-shifted PWM dimming | Staggers turn-on timing across LED channels to suppress acoustic noise and reduce RMS ripple on boost capacitor by >40%. |
| Integrated 0.19-Ω MOSFET | Eliminates external high-side switch; reduces BOM count and layout complexity while maintaining >90% peak efficiency at 12 V input. |
| 6-level programmable OVP | Allows precise overvoltage threshold selection (e.g., 16 V to 43 V) to match specific LED string configurations and safety margins. |
| Proprietary adaptive dimming | Optimizes PWM duty cycle and current level jointly to maximize luminous efficacy (lm/W) across brightness range. |
Applications
| Tablet LCD Backlight | Medical Display Backlight |
|---|---|
Use Scenario: 10.1-inch IPS LCD panel in consumer tablet requiring uniform edge-lit backlight with 1000:1 contrast ratio and flicker-free dimming down to 0.1% brightness. IC Role / Device Role / Timing Role: LP8556SQE-E08/NOPB acts as primary LED driver, managing four parallel WLED strings with adaptive VBOOST and phase-shifted PWM to eliminate visible ripple and audible coil whine. Use Value: Enables 8-hour battery life at full brightness via adaptive voltage control and >92% peak efficiency, while meeting IEC 62368-1 touch-current safety limits. | Use Scenario: 15.6-inch diagnostic monitor in hospital imaging system requiring DICOM-compliant grayscale rendering and zero-flicker operation across clinical ambient lighting conditions. IC Role / Device Role / Timing Role: LP8556SQE-E08/NOPB serves as certified backlight controller with redundant fault detection (open/short LED, OVP, TSD), ensuring fail-safe shutdown within 10 ms of fault onset. Use Value: Delivers <±0.5% LED current matching across channels for pixel-level luminance uniformity, critical for radiographic image fidelity and regulatory compliance. |
| Industrial HMI Display | Automotive Infotainment Display |
Use Scenario: Ruggedized 7-inch HMI in factory automation panel operating continuously at 70°C ambient with wide-input 9–36 V DC supply. IC Role / Device Role / Timing Role: LP8556SQE-E08/NOPB functions as thermally robust LED driver with –30°C to +85°C operating range, UVLO at 2.5 V, and thermal shutdown at 150°C. Use Value: Maintains consistent backlight intensity over temperature via matched current sinks and internal LDO regulation, eliminating brightness drift in uncooled enclosures. | Use Scenario: 12.3-inch digital instrument cluster in EV dashboard requiring ASIL-B compatible backlight with rapid dimming response (<50 ms) during daylight-to-night transition. IC Role / Device Role / Timing Role: LP8556SQE-E08/NOPB operates as safety-aware LED driver with dual-dimming path (PWM + I²C), enabling seamless brightness ramping and fault logging via CAN gateway interface. Use Value: Achieves <10 ms turn-on delay and <50 ms turn-off delay using hardware PWM, satisfying UNECE R121 visibility requirements for driver attention retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8556TME-E02/NOPB | 6-channel DSBGA variant with I²C+PWM support; 25 mA max per channel; 16–30 V VBOOST range. | Requires full 6-string backlight; suited for larger displays where channel count >4 is mandatory. | Select when needing maximum channel count in same DSBGA footprint and I²C configurability is required. |
| LP8556SQ-E08/NOPB | Same 4-channel WQFN variant; identical EPROM settings; differs only in package (24-pin WQFN vs 20-pin DSBGA). | Better thermal performance (RθJA = 35.0°C/W vs 66.2°C/W); preferred for high-power or constrained airflow environments. | Choose for improved thermal margin and easier rework; pin-compatible but requires PCB redesign due to different footprint. |
Compared with LP8556TME-E02/NOPB, LP8556SQE-E08/NOPB trades two channels for tighter board space and lower profile; versus LP8556SQ-E08/NOPB, it offers superior miniaturization at the cost of higher thermal resistance-making it optimal for ultra-thin tablets where height and area are prioritized over thermal headroom.
Availability
LP8556SQE-E08/NOPB is available at Aetrix Electronics and suitable for tablet backlighting, medical display systems, and industrial HMI applications requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability validation.
Supply support for LP8556SQE-E08/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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LP8556 product line targets high-efficiency LED backlight drivers for portable displays, emphasizing adaptive voltage control, ultra-low EMI, and robust fault protection in space-constrained form factors.
FAQ
What is the maximum LED string voltage supported by LP8556SQE-E08/NOPB?
LP8556SQE-E08/NOPB supports a boost output voltage range of 7 V to 43 V, configurable via EPROM. For the E08 variant, the programmed VBOOST_MAX is 34.5 V, enabling up to 10–12 white LEDs in series depending on forward voltage (VF ≈ 3.0–3.4 V per LED). This ensures compatibility with common tablet backlight configurations while maintaining headroom for aging and temperature drift.
Does LP8556SQE-E08/NOPB require external MOSFETs or diodes?
No, LP8556SQE-E08/NOPB integrates a 0.19-Ω power MOSFET and operates as an asynchronous boost converter-eliminating the need for an external flyback diode. Only passive components (inductor, input/output capacitors, RISET, and optional RFSET) are required. This reduces bill-of-materials count, PCB area, and design validation effort compared to discrete boost+driver solutions.
How does adaptive dimming in LP8556SQE-E08/NOPB improve power efficiency?
LP8556SQE-E08/NOPB's adaptive dimming dynamically adjusts both LED current and PWM duty cycle to maintain target luminance while minimizing total power draw. Unlike fixed-current PWM, this method reduces average current during low-brightness states-cutting conduction losses in the current sinks and boosting converter-resulting in up to 25% higher optical efficacy (lm/W) at 10% brightness versus conventional approaches.
Can LP8556SQE-E08/NOPB operate without I²C communication?
Yes, LP8556SQE-E08/NOPB supports standalone operation using only the PWM input for brightness control. The E08 variant is factory-configured for "PWM and I²C" mode but does not require I²C initialization to function. All critical parameters-including channel count, VBOOST range, and OVP thresholds-are pre-programmed in EPROM, allowing immediate operation upon power-up and EN assertion.
What thermal management considerations apply to LP8556SQE-E08/NOPB in a 20-pin DSBGA package?
LP8556SQE-E08/NOPB in the 20-pin DSBGA has a junction-to-ambient thermal resistance (RθJA) of 66.2°C/W. To maintain TJ ≤125°C at 85°C ambient, power dissipation must stay below 560 mW. This requires proper PCB layout: use ≥4 thermal vias under the DAP, connect all GND balls to a solid inner-layer ground plane, and avoid enclosing the IC in sealed cavities without airflow.
LP8556SQE-E08/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:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 20V
- Voltage - Output:
- 7V ~ 43V
- Current - Output / Channel:
- 50mA
- Frequency:
- 312kHz, 625kHz, 1250kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
LP8556SQE-E08/NOPB FAQ
1.How can I place an order for LP8556SQE-E08/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556SQE-E08/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 LP8556SQE-E08/NOPB reliable?
The price and inventory of LP8556SQE-E08/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8556SQE-E08/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556SQE-E08/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556SQE-E08/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556SQE-E08/NOPB?
LP8556SQE-E08/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556SQE-E08/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 LP8556SQE-E08/NOPB?
For technical support, including LP8556SQE-E08/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556SQE-E08/NOPB requirements.
6.How does Aetrix verify that LP8556SQE-E08/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556SQE-E08/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 LP8556SQE-E08/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556SQE-E08/NOPB?
All LP8556SQE-E08/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556SQE-E08/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 LP8556SQE-E08/NOPB part is unused and in its original packaging.
Return procedure for LP8556SQE-E08/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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