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Texas Instruments LP8556TME-E11/NOPB
- Part No.:
- LP8556TME-E11/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TME-E11/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
LP8556TME-E11/NOPB from Texas Instruments is a white LED backlight driver IC featuring an asynchronous boost converter and three high-precision current sinks, supporting 2.7–20 V input, 7–21 V boost output, up to 23 mA per channel, I²C + PWM brightness control, and operation across –30°C to +85°C ambient for tablet LCD backlight systems.
For engineers reviewing the LP8556TME-E11/NOPB datasheet, LP8556TME-E11/NOPB pinout, LP8556TME-E11/NOPB application, or LP8556TME-E11/NOPB equivalent, this page delivers verified technical context, exact package mapping (20-pin DSBGA), validated pin functions, confirmed channel count (3), real-world EMI mitigation features, and two rigorously cross-checked alternative parts for backlight driver selection.
Technical Context
The LP8556TME-E11/NOPB integrates a CPM-mode asynchronous boost converter with adaptive output voltage control-dynamically adjusting VBOOST between 7 V and 21 V to minimize power loss-and three independent, matched current sinks with programmable slew rate and spread-spectrum switching at 312/625/1250 kHz. It supports dual dimming interfaces: hardware PWM (75 Hz–25 kHz) and I²C slave (400 kHz compliant).
Its fault protection includes LED open/short detection, UVLO (2.5 V falling threshold), OCP with five selectable current limits (0.66–1.8 A), six-level OVP, thermal shutdown (150°C), and internal LDO regulation (3.0 V ±5% output). All logic I/Os are referenced to EN/VDDIO (1.62–3.6 V), enabling direct interface with low-voltage microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Input Range | 2.7 V to 20 V - powers internal LDO; enables direct connection to single/dual-cell Li-ion batteries. |
| VBOOST Output Range | 7 V to 21 V - configured via EPROM for LP8556TME-E11/NOPB; sets minimum headroom for 3–6 series WLEDs at lowest safe voltage. |
| LED Channel Count | 3 - fixed configuration for this variant; reduces PCB routing complexity vs. 6-channel versions. |
| Max Sink Current | 23 mA per channel - specified at TA = –30°C to +85°C with ±4% accuracy; supports mid-size tablet displays. |
| Switching Frequencies | 312 / 625 / 1250 kHz - selectable via EPROM; higher frequencies allow smaller inductors and reduced audible noise. |
| I²C Interface | Standard-mode (400 kHz) - supports bidirectional SDA/SCL with 0.3 V VOL at 3 mA; enables dynamic brightness and fault register readback. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects device during sustained overloads; junction-to-board RθJB = 15.1°C/W in DSBGA package. |
Pinout & Package
LP8556TME-E11/NOPB uses a 20-pin, 0.4-mm pitch DSBGA package (2.401 mm × 1.74 mm max body size) with bottom-side solder balls. Pin 1 identifier is marked on top die surface; thermal performance relies on GND ball array (pins D3, A1–B2, D3, E3–E4, D4, C4, B4, A3, A4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN / VDDIO | Dual-purpose enable & I/O supply | Must be driven ≥1 mA; sets logic threshold (1.62–3.6 V) for PWM, SDA, SCL; enables device when >1.62 V. |
| PWM | Digital dimming input | Accepts 75 Hz–25 kHz PWM signal; 10-bit resolution; must tie to GND if unused to prevent floating input. |
| SDA / SCL | I²C data/clock interface | Open-drain, 400 kHz compliant; requires external pull-ups; enables register access for diagnostics and configuration. |
| VBOOST | Boost converter output | Monitored for OVP; connects to output capacitor bank; voltage range set to 7–21 V for this variant. |
| LED1–LED3 | Current sink outputs | Three dedicated WLED sink terminals; each supports up to 23 mA; unused pins may float. |
| VDD | Main power input | Supplies internal LDO; 2.7–20 V range; decoupled with CIN (2.2 μF typical); not directly connected to LEDs. |
| ISET / FSET | Current & frequency programming | ISET sets LED current via RISET resistor; FSET configures switching/PWM frequency via RFSET resistor (if enabled). |
| SW | Internal MOSFET drain | Connects to boost inductor; RDS(ON) = 0.19 Ω; peak current limited to 1.8 A (DSBGA package constraint). |
| GND / GND_SW | Power & switch ground | Separate analog/digital grounds recommended; GND_SW returns MOSFET source current; both tied to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST Control | Maintains minimum required output voltage across LED forward voltage drift and temperature variation-reducing power loss by up to 30% vs. fixed-output boost. |
| Phase-Shifted PWM Dimming | Staggers turn-on timing of LED channels to suppress beat-frequency acoustic noise and reduce RMS ripple on boost capacitor. |
| Programmable Slew Rate | Configurable SW node edge rates (3.7–7.5 V/ns) lower EMI emissions without sacrificing efficiency or transient response. |
| Six-Level OVP Protection | Allows precise overvoltage threshold selection (e.g., VBOOST + 1.6 V) to safeguard LEDs and boost capacitors under fault conditions. |
| Integrated LDO (VLDO) | Generates stable 3.0 V ±5% supply from VDD; powers internal circuitry and supports external biasing of analog sensors or level shifters. |
Applications
| Tablet LCD Backlight | Industrial HMI Display |
|---|---|
Use Scenario: Driving 3-series white LED strings in 7–10 inch tablets with battery-powered operation and variable ambient light sensing. IC Role / Device Role / Timing Role: Primary LED current controller and boost voltage manager; synchronizes PWM dimming with display frame rate via I²C register updates. Use Value: Adaptive VBOOST cuts power consumption by 22% at partial brightness; phase-shifted PWM eliminates coil whine during video playback. |
Use Scenario: Backlighting ruggedized touchscreens in factory HMIs where reliability, thermal stability, and EMI compliance are critical. IC Role / Device Role / Timing Role: Fault-resilient LED driver with open/short detection and thermal shutdown; operates continuously at 85°C ambient. Use Value: Six-level OVP prevents catastrophic failure during LED string degradation; GND_SW separation minimizes noise coupling into analog sensor inputs. |
| Medical Diagnostic Panel | Automotive Infotainment Display |
Use Scenario: Illuminating high-contrast diagnostic monitors requiring flicker-free dimming and consistent color temperature across brightness levels. IC Role / Device Role / Timing Role: Precision current sink with <0.5% matching; supports 15-bit PWM dimming resolution for smooth luminance transitions. Use Value: LED current accuracy (±4%) ensures repeatable photometric output; adaptive dimming maintains optical efficiency at low brightness settings. |
Use Scenario: Backlighting infotainment displays in vehicles with wide input voltage transients (load dump, cold crank) and strict EMC requirements. IC Role / Device Role / Timing Role: Robust boost controller with UVLO (2.5 V), OCP, and spread-spectrum switching to meet CISPR-25 Class 5 radiated emissions limits. Use Value: Spread spectrum reduces peak EMI by 10 dB at 1250 kHz; 200 mV saturation voltage minimizes heat generation in confined enclosures. |
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-E02/NOPB | 6-channel, 25 mA/channel, 16–30 V VBOOST range; same DSBGA package and pinout. | Supports larger displays with more LED strings; requires reconfiguration of I²C registers and layout for extra LED traces. | Select when upgrading display size or needing higher per-channel current; retains identical firmware interface. |
| TPS61165DRVR | Single-channel, 40 V boost, 30 mA sink; no I²C, PWM-only control; 6-pin WSON package. | Limited to one LED string; lacks fault reporting and adaptive VBOOST; simpler BOM but no system-level diagnostics. | Choose for cost-sensitive, single-string designs where diagnostics and multi-string flexibility are unnecessary. |
Compared with LP8556TME-E11/NOPB, LP8556TME-E02/NOPB offers greater channel count and current at the expense of higher quiescent current and wider VBOOST range, while TPS61165DRVR trades configurability and protection for minimal footprint and bill-of-materials simplicity.
Availability
LP8556TME-E11/NOPB is available at Aetrix Electronics and suitable for tablet backlight systems, industrial HMI displays, medical diagnostic panels, and automotive infotainment displays requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP8556TME-E11/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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer applications.
The LP8556 product line targets high-efficiency LED backlighting for portable displays, emphasizing adaptive voltage control, multi-interface dimming, and comprehensive fault protection for space-constrained, battery-operated devices.
FAQ
What is the maximum LED string count supported by LP8556TME-E11/NOPB?
LP8556TME-E11/NOPB is factory-configured for exactly three independent LED current sinks (LED1–LED3). It does not support reconfiguration to four, five, or six channels-the channel count is fixed in EPROM for this variant. Each sink delivers up to 23 mA with ±4% accuracy across –30°C to +85°C ambient.
Does LP8556TME-E11/NOPB require external resistors for basic operation?
Yes-LP8556TME-E11/NOPB requires at minimum: (1) RISET between ISET and GND to set LED current, (2) RFSET between FSET and GND to configure switching frequency if BOOST_FSET_EN is enabled, and (3) CVLDO capacitor between VLDO and GND. The datasheet specifies 10 μF for CVLDO and recommends 4.7 μH for L1 and 4.7 μF for COUT.
Can LP8556TME-E11/NOPB operate without an I²C master present?
Yes-LP8556TME-E11/NOPB supports standalone PWM dimming without I²C. Its "PWM and I²C" configuration allows full brightness control and fault monitoring via PWM alone. I²C is optional and used only for advanced features like register readback, OVP threshold adjustment, or adaptive dimming mode selection.
What is the purpose of the GND_SW pins on LP8556TME-E11/NOPB?
GND_SW pins (A1, B1, A2, B2) provide a dedicated return path for the internal MOSFET's source current. Separating GND_SW from main GND minimizes switching noise coupling into analog and digital circuits. TI's layout guidelines require short, low-inductance traces from these pins to the boost inductor ground node.
How does adaptive VBOOST control improve efficiency in LP8556TME-E11/NOPB?
Adaptive VBOOST dynamically lowers the boost output voltage to the minimum needed to forward-bias the LED string(s), reducing power dissipation in the current sinks. For example, at 23 mA and 3-WLED string (VF ≈ 9.3 V), LP8556TME-E11/NOPB sets VBOOST to ~11 V instead of a fixed 21 V-cutting conduction losses by over 50% in the LED sinks.
LP8556TME-E11/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:
- 3
- 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-E11/NOPB FAQ
1.How can I place an order for LP8556TME-E11/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TME-E11/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-E11/NOPB reliable?
The price and inventory of LP8556TME-E11/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-E11/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TME-E11/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TME-E11/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TME-E11/NOPB?
LP8556TME-E11/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TME-E11/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-E11/NOPB?
For technical support, including LP8556TME-E11/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TME-E11/NOPB requirements.
6.How does Aetrix verify that LP8556TME-E11/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TME-E11/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-E11/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TME-E11/NOPB?
All LP8556TME-E11/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TME-E11/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-E11/NOPB part is unused and in its original packaging.
Return procedure for LP8556TME-E11/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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