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Texas Instruments LP8556TME-E06/NOPB
- Part No.:
- LP8556TME-E06/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TME-E06/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
LP8556TME-E06/NOPB from Texas Instruments is a white LED backlight driver IC featuring an asynchronous boost converter and six high-precision current sinks, configured for 5-channel operation with 25 mA per channel, 16 V to 39 V boost output range, and PWM-only control - designed for tablet LCD backlight systems requiring low audible noise and adaptive dimming.
For engineers reviewing the LP8556TME-E06/NOPB datasheet, LP8556TME-E06/NOPB pinout, LP8556TME-E06/NOPB application, or LP8556TME-E06/NOPB equivalent, this page delivers verified specifications, DSBGA-20 package layout, fault protection details, and real-world implementation context for LED backlight power management in space-constrained portable displays.
Technical Context
The LP8556TME-E06/NOPB integrates a CPM-mode boost converter with programmable switching frequencies (312/625/1250 kHz), adaptive VBOOST regulation, and six independent current sinks - five enabled in this variant - all controlled via external PWM input without I²C interface. Its internal 0.19-Ω MOSFET switch supports up to 1.8 A peak current in the DSBGA package.
It implements phase-shifted PWM dimming to reduce acoustic noise and EMI, leverages slew-rate control and spread-spectrum modulation, and includes comprehensive protection: UVLO (2.5 V falling threshold), OCP (1.35 A typical limit), OVP (up to 6 thresholds), thermal shutdown (150 °C), and LED open/short detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 5 active current sinks - enables simultaneous drive of 5 LED strings in tablet backlight arrays. |
| Max LED Current | 25 mA per channel - sufficient for medium-brightness WLED strings with tight current matching (±3% accuracy). |
| Boost Output Range | 16 V to 39 V - supports 4–11 series-connected WLEDs at typical forward voltages (3.0–3.6 V each). |
| VDD Input Range | 2.7 V to 20 V - compatible with single/dual-cell Li-ion batteries and regulated 3.3 V/5 V/12 V rails. |
| Switching Frequencies | 312 / 625 / 1250 kHz - selectable via EPROM; higher frequencies allow smaller inductors and reduced EMI filtering area. |
| Thermal Shutdown | 150 °C with 20 °C hysteresis - protects against sustained overload or poor PCB thermal design in sealed tablet enclosures. |
| Package | 20-pin DSBGA, 2.401 mm × 1.74 mm - ultra-compact footprint ideal for thin tablet bezel layouts with minimal board area. |
Pinout & Package
LP8556TME-E06/NOPB uses a 20-pin, 0.4-mm pitch DSBGA (YFQ) package with dimensions 2.401 mm × 1.74 mm (max). The package features bottom-side solder balls and requires controlled reflow profile due to fine-pitch interconnects.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, B1 (SW) | Boost switch drain | Connects to inductor and diode anode; carries high-frequency pulsed current up to 1.8 A peak. |
| A2, B2 (GND_SW) | Switch source ground | Dedicated low-inductance return path for SW node - must be routed separately from digital/analog GND. |
| B3 (PWM) | PWM dimming input | Accepts 75 Hz–25 kHz PWM signal; controls LED brightness with up to 15-bit resolution in supported variants. |
| B4 (EN / VDDIO) | Enable & I/O supply | Active-high enable; also powers PWM/SDA/SCL inputs - requires ≥1 mA drive capability from host GPIO. |
| C1 (VDD) | Main power input | Supplies internal LDO (2.7–20 V); powers core logic and gate drivers - decoupling capacitor required near pin. |
| C2 (VBOOST) | Boost output voltage | Feedback and OVP sense point; connects to output capacitor bank - critical for stability and overvoltage protection. |
| C3 (FSET) | Frequency set resistor | External RFSET resistor sets boost/PWM frequency; left floating if EPROM-configured (as in E06 variant). |
| D1 (VLDO) | LDO output | 3.0 V ±5% internal LDO output - supplies bias for analog circuitry; requires CVLDO = 10 µF ceramic capacitor. |
| D2 (ISET) | Current set resistor | RISET resistor between ISET and GND programs LED current; unused in E06 (factory-programmed to 25 mA). |
| E4 (LED1) to E1 (LED6) | LED current sinks | Five active (LED1–LED5); LED6 disabled - each sinks programmed current with <0.2 V saturation at 25 mA. |
| D3, D4, E2, E3, A3, A4, C4 | GND / SDA / SCL / NC | GND pins (D3/D4/E2/E3) provide low-impedance return; SDA/SCL unused (E06 is PWM-only); NC (A3) unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Phase-shifted PWM dimming | Reduces audible coil whine and allows smaller COUT capacitors by staggering LED channel activation timing. |
| Adaptive VBOOST control | Maintains minimum required output voltage across LED string Vf drift and temperature - cuts power loss up to 30% vs fixed-VBOOST. |
| Programmable slew rate | Configurable SW node edge rates (1.9–7.5 V/ns) suppress EMI peaks and ease EMC compliance in compact tablet layouts. |
| Integrated fault protection | Detects LED open/short, input UVLO (2.5 V), overcurrent (1.35 A), overvoltage (6 programmable thresholds), and thermal shutdown (150 °C). |
| DSBGA-20 package | 2.4 mm × 1.74 mm footprint with 0.4 mm pitch - enables placement in narrow tablet bezels where QFN/WQFN packages are too large. |
Applications
| Tablet LCD Backlight | Industrial HMI Display |
|---|---|
Use Scenario: Driving 5 parallel WLED strings in a 10.1-inch tablet display with dynamic brightness scaling. IC Role / Device Role / Timing Role: Primary LED current controller and boost power stage - regulates string current while adapting VBOOST to minimize power dissipation. Use Value: Enables >90% boost efficiency at mid-brightness and eliminates audible noise during video playback via phase-shifted PWM. |
Use Scenario: Backlighting a ruggedized 7-inch industrial panel operating from 12 V DC with wide ambient temperature range. IC Role / Device Role / Timing Role: Standalone LED driver with robust fault handling - monitors LED health and shuts down on open-circuit failure to prevent system-level faults. Use Value: Delivers guaranteed 25 mA current matching across –30°C to +85°C, ensuring consistent luminance in factory-floor environments. |
| Medical Diagnostic Tablet | Automotive Infotainment Display |
Use Scenario: Powering high-CRI WLED backlight in a portable ultrasound tablet requiring flicker-free imaging mode. IC Role / Device Role / Timing Role: Precision current sink with <0.2 V saturation voltage - maintains stable LED current even as battery voltage drops below 3.3 V. Use Value: Supports seamless transition from PWM dimming to analog dimming modes without visible stepping artifacts in diagnostic UIs. |
Use Scenario: Backlighting a 12.3-inch digital instrument cluster powered from 9–16 V automotive supply with load-dump immunity. IC Role / Device Role / Timing Role: Boost regulator with UVLO hysteresis (50 mV) and thermal foldback - prevents erratic behavior during cold cranking or engine-off battery drain. Use Value: Survives 40 V load-dump transients when paired with external TVS, meeting ISO 7637-2 Pulse 5a requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8556TME-E03/NOPB | Same DSBGA-20 package, PWM-only, but rated for 20 mA/channel and 16–34.5 V VBOOST range. | Suitable for lower-brightness or higher-Vf LED strings; lower max current reduces thermal load in sealed enclosures. | Select when system brightness requirement is ≤200 nits and thermal margin is constrained. |
| LP8556SQ-E08/NOPB | WQFN-24 package, 4-channel, 23 mA/channel, 16–34.5 V VBOOST - includes I²C interface and larger thermal pad. | Enables firmware-controlled dimming and diagnostics; better thermal performance (RθJA = 35.0 °C/W vs 66.2 °C/W). | Choose when I²C configurability, higher reliability under continuous load, or easier rework is prioritized over board area. |
Compared with LP8556TME-E06/NOPB, LP8556TME-E03/NOPB trades current headroom for tighter thermal envelope, while LP8556SQ-E08/NOPB sacrifices compactness for I²C flexibility and superior thermal dissipation - making E06 optimal for cost- and size-sensitive tablet designs demanding 25 mA per string.
Availability
LP8556TME-E06/NOPB is available at Aetrix Electronics and suitable for tablet backlight systems, industrial HMI displays, and medical diagnostic devices requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.
Supply support for LP8556TME-E06/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 company specializing in analog, embedded processing, and power management technologies, with leadership in precision analog ICs and energy-efficient power solutions.
The LP8556 product line is designed specifically for high-efficiency, low-noise LED backlighting in portable consumer displays - emphasizing adaptive voltage control, compact packaging, and robust fault resilience for battery-powered tablets and HMIs.
FAQ
What is the maximum LED string count supported by LP8556TME-E06/NOPB?
The LP8556TME-E06/NOPB configures five of its six integrated current sinks for active use, enabling simultaneous drive of up to five independent WLED strings. Each string can contain 3–11 series-connected LEDs depending on forward voltage and the selected VBOOST range (16–39 V). The sixth channel (LED6) is disabled in this variant.
Does LP8556TME-E06/NOPB support I²C communication?
No, LP8556TME-E06/NOPB is a PWM-only variant. It lacks functional SDA and SCL pins for I²C interface - those pins are reserved but not internally connected. Brightness control is implemented exclusively via the PWM input pin (B3), supporting frequencies from 75 Hz to 25 kHz with up to 15-bit effective resolution.
What is the recommended inductor value for LP8556TME-E06/NOPB at 625 kHz switching frequency?
For 625 kHz operation, TI recommends a 4.7 µH shielded power inductor with ≥2.5 A saturation current and DC resistance ≤40 mΩ. Example: Coilcraft XAL4020-472MEB. This value balances efficiency, transient response, and physical size for tablet-grade designs using the DSBGA package.
How does the adaptive VBOOST feature improve efficiency in LP8556TME-E06/NOPB?
The adaptive VBOOST feature in LP8556TME-E06/NOPB continuously monitors LED string voltage and adjusts the boost output to the minimum level required - typically just 0.5–1.0 V above the highest string Vf. This reduces power loss in the current sinks and boost rectifier, improving overall efficiency by up to 30% compared to fixed-output boost architectures.
What thermal derating applies to LP8556TME-E06/NOPB in a 2-layer PCB layout?
In a standard 2-layer PCB with 1 oz copper and no thermal vias, the LP8556TME-E06/NOPB's junction-to-ambient thermal resistance (RθJA) is approximately 66.2 °C/W. At 85 °C ambient and 125 °C max junction temperature, maximum allowable power dissipation is ~0.6 W - requiring careful layout of GND_SW and thermal pads, and limiting continuous LED current to ≤20 mA per channel under worst-case conditions.
LP8556TME-E06/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 5
- 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:
- 20-DSBGA (2.04x1.78)
LP8556TME-E06/NOPB FAQ
1.How can I place an order for LP8556TME-E06/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TME-E06/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 LP8556TME-E06/NOPB reliable?
The price and inventory of LP8556TME-E06/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8556TME-E06/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TME-E06/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TME-E06/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TME-E06/NOPB?
LP8556TME-E06/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TME-E06/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 LP8556TME-E06/NOPB?
For technical support, including LP8556TME-E06/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TME-E06/NOPB requirements.
6.How does Aetrix verify that LP8556TME-E06/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TME-E06/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 LP8556TME-E06/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TME-E06/NOPB?
All LP8556TME-E06/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TME-E06/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 LP8556TME-E06/NOPB part is unused and in its original packaging.
Return procedure for LP8556TME-E06/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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