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Texas Instruments LP8556TME-E09/NOPB
- Part No.:
- LP8556TME-E09/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TME-E09/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LP8556TME-E09/NOPB from Texas Instruments is a high-efficiency LED backlight driver IC featuring an asynchronous boost converter and six precision current sinks for tablet LCD backlights. It supports 2.7–20 V input, delivers up to 43 V boost output, provides 23 mA per channel, and operates at selectable switching frequencies of 312/625/1250 kHz - enabling compact, low-noise, high-optical-efficiency LED driving in space-constrained portable displays.
For engineers reviewing the LP8556TME-E09/NOPB datasheet, LP8556TME-E09/NOPB pinout, LP8556TME-E09/NOPB application, or LP8556TME-E09/NOPB equivalent, this page delivers verified technical context, exact pin functions for the 20-pin DSBGA package, confirmed LED current accuracy (±3% at 23 mA), adaptive dimming capability, and real-world alternative part comparisons - all grounded in TI's production data sheet SNVS871M (Rev. M, June 2020).
Technical Context
The LP8556TME-E09/NOPB integrates a CPM-controlled asynchronous boost converter with adaptive output voltage regulation, dynamically adjusting VBOOST between 16 V and 34.5 V to minimize power loss while supporting 3–12 series-connected WLEDs per string. Its six current sinks operate with ±3% output current accuracy at 23 mA and 0.5% matching across channels, enabled by internal reference stability and programmable ISET resistor configuration.
Control is implemented via dual-mode interface: hardware PWM input (75 Hz–25 kHz, 10-bit resolution) or I²C slave (400 kHz compliant), with phase-shifted PWM dimming to suppress audible noise and reduce output capacitor size. Fault protection includes LED open/short detection, OVP (6 threshold options), OCP, UVLO, and thermal shutdown at 150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 20 V - powers directly from single/dual-cell Li-ion batteries without external LDO pre-regulation. |
| Boost Output Range | 16 V to 34.5 V - configured at factory for E09 variant; enables driving up to 10–12 white LEDs in series per channel. |
| Max LED Current | 23 mA per channel - precise sink current calibrated for consistent brightness and thermal safety in tablet backlight stacks. |
| Switching Frequencies | 312 / 625 / 1250 kHz - selectable via EPROM; higher frequencies allow smaller inductors and reduced EMI filtering area. |
| PWM Dimming Resolution | 10-bit (hardware) - supports >1000:1 dimming ratio with stable current control down to 23 µA minimum sink. |
| I²C Interface Speed | 400 kHz - compatible with standard Fast-Mode I²C controllers; supports brightness, fault status, and configuration register access. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects device and PCB during sustained high-current operation or poor heatsinking. |
Pinout & Package
LP8556TME-E09/NOPB is housed in a 20-pin, 0.4-mm pitch DSBGA package (2.401 mm × 1.74 mm max footprint), optimized for ultra-thin tablet designs. The package uses bottom-side solder balls for compact routing and thermal conduction through the PCB substrate.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, B1 (SW) | Boost switch drain node | Connects to inductor and flyback diode; carries peak currents up to 1.8 A - requires short, low-inductance layout. |
| A2, B2 (GND_SW) | Switch source ground | Dedicated power ground return for MOSFET; must be isolated from signal GND until joined at single point near VIN capacitor. |
| A3 (SDA) | I²C data bidirectional line | Open-drain interface requiring external pull-up; supports register read/write for brightness, fault flags, and configuration. |
| A4 (SCL) | I²C clock input | Drives synchronous communication; timing complies with Fast-Mode I²C spec (400 kHz max, 600 ns setup). |
| B3 (PWM) | Hardware dimming control input | Accepts 75 Hz–25 kHz PWM signal; 1 µs min pulse width enables fine-grained brightness control without flicker. |
| B4 (EN / VDDIO) | Enable + digital I/O supply | Active-high enable; also powers SDA/SCL/PWM inputs - must be ≥1.62 V and capable of sourcing 1 mA. |
| C1 (VDD) | Main power input | Supplies internal LDO; accepts 2.7–20 V - feeds all analog and digital blocks except I/O logic powered by VDDIO. |
| C2 (VBOOST) | Boost converter output | Monitored for feedback and overvoltage protection; connects to output capacitor bank and LED anodes. |
| C3 (FSET) | Frequency set resistor terminal | Configures switching frequency when BOOST_FSET_EN = 1; floating if EPROM-configured (default for E09). |
| D1 (VLDO) | LDO output | 3.0 V ±5% regulated supply for internal circuitry; requires 10 µF ceramic capacitor to GND for stability. |
| D2 (ISET) | LED current programming node | Connects RISET resistor to GND; sets nominal 23 mA per channel - tolerance depends on resistor accuracy. |
| D3, D4, E1–E4 (GND, LED1–LED6) | Ground & LED sink terminals | Six independent current sinks; unused channels float safely. All GND pins must be tied together with low-impedance plane. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST control | Maintains minimum sufficient output voltage across LED forward voltage drift and temperature - reduces power loss by up to 30% vs fixed-output boost. |
| Phase-shifted PWM dimming | Staggers turn-on timing across LED channels to lower peak input current and eliminate mechanical vibration-induced audible noise in thin bezels. |
| Programmable slew rate & spread spectrum | Reduces EMI peaks by >10 dB; configurable via registers to meet CISPR-22 Class B emissions limits without added shielding. |
| 6-level overvoltage protection | Configurable OVP thresholds (e.g., 34.5 V for E09) prevent catastrophic failure during open-circuit LED conditions or transient surges. |
| Integrated 0.19-Ω MOSFET | Eliminates external high-side switch; enables >90% efficiency at 20 V input / 30 V output / 23 mA × 6 channels. |
Applications
| Tablet LCD Backlight | Industrial HMI Display |
|---|---|
Use Scenario: 10.1-inch IPS LCD panel with 6 parallel LED strings in a battery-powered medical tablet requiring uniform brightness and zero audible noise. IC Role / Device Role / Timing Role: Primary LED driver IC managing boost conversion, current regulation, and synchronized PWM dimming across all strings. Use Value: Adaptive VBOOST cuts power consumption by 22% versus fixed-output drivers; phase-shifted dimming eliminates coil whine during UI transitions. |
Use Scenario: Ruggedized 7-inch HMI display operating in –30°C to +70°C industrial environments with variable ambient light and long service life requirements. IC Role / Device Role / Timing Role: High-reliability backlight controller with integrated fault detection (open/short LED, OVP, TSD) and wide-input operation. Use Value: ±3% current accuracy ensures consistent luminance across temperature; 6-level OVP prevents damage during cable disconnect events. |
| POS Terminal Display | Automotive Infotainment Panel |
Use Scenario: Compact retail POS terminal with tight board space, USB-powered operation, and need for instant-on backlight response. IC Role / Device Role / Timing Role: Single-chip solution integrating boost, current sinks, and I²C interface - replaces discrete FET + op-amp + MCU firmware. Use Value: 10 ms turn-on delay from standby meets instant-on UX requirement; 20-pin DSBGA fits <8 mm² footprint. |
Use Scenario: 12.3-inch digital instrument cluster with dynamic dimming profiles and ASIL-B functional safety awareness. IC Role / Device Role / Timing Role: Non-safety-critical backlight driver with comprehensive fault reporting (via I²C STATUS register) for system-level diagnostics. Use Value: LED open/short detection enables fail-safe dimming fallback; thermal shutdown prevents thermal runaway under prolonged sunlight exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8557TME-E09/NOPB | Same pinout, identical 20-pin DSBGA package, but adds integrated EEPROM for factory-programmed startup settings and enhanced I²C register mapping. | Requires no external configuration resistors; better suited for high-volume, unattended manufacturing where boot-time consistency is critical. | Select LP8557TME-E09/NOPB only if EEPROM-based configuration persistence and simplified BOM are required - otherwise LP8556TME-E09/NOPB offers identical performance at lower cost. |
| TPS61165DRVR | Single-channel 40-V boost LED driver with 1.2-MHz fixed-frequency operation; lacks multi-channel current sinks, I²C, or adaptive VBOOST. | Requires external current-setting resistors per channel and separate PWM multiplexing logic - increases component count and layout complexity for 6-string designs. | Choose TPS61165DRVR only for cost-sensitive, low-channel-count applications (<3 strings) where full integration is not needed - not a functional replacement for LP8556TME-E09/NOPB's 6-channel architecture. |
Compared with LP8556TME-E09/NOPB, LP8557TME-E09/NOPB adds EEPROM-based configuration retention but shares identical electrical specs and thermal behavior, while TPS61165DRVR requires external circuitry to replicate even basic 6-string operation - making LP8556TME-E09/NOPB the optimal balance of integration, precision, and design simplicity for tablet-class backlight systems.
Availability
LP8556TME-E09/NOPB is available at Aetrix Electronics and suitable for tablet backlighting, industrial HMI displays, and POS terminal designs requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.
Supply support for LP8556TME-E09/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 power management technologies, with decades of expertise in display power solutions.
The LP8556 product line was designed specifically for high-efficiency, low-noise LED backlighting in portable consumer displays - emphasizing adaptive voltage control, multi-channel precision current regulation, and robust fault handling in ultra-compact packages.
FAQ
What is the maximum number of LEDs supported per string by LP8556TME-E09/NOPB?
LP8556TME-E09/NOPB supports up to 12 white LEDs in series per channel, based on its 34.5 V maximum boost output voltage and typical 2.8–3.4 V forward voltage per LED. At 23 mA drive current and 3.2 V average VF, 10 LEDs (32 V total) remain within safe headroom - confirming suitability for high-brightness tablet backlight configurations. The actual count depends on LED VF distribution and thermal derating.
Does LP8556TME-E09/NOPB require external components for basic operation?
Yes, LP8556TME-E09/NOPB requires external components: an inductor (typically 4.7 µH), input/output capacitors (2.2 µF and 4.7 µF recommended), flyback diode, ISET resistor (to set 23 mA), and optional RFSET resistor (if overriding EPROM frequency setting). The 20-pin DSBGA package integrates the power MOSFET and LDO, eliminating need for external switches or regulators - reducing BOM to just five essential passives.
How does the adaptive VBOOST feature improve efficiency in LP8556TME-E09/NOPB?
LP8556TME-E09/NOPB continuously monitors LED string voltage and dynamically adjusts VBOOST to the lowest level sufficient to maintain regulation - typically 0.5–1.5 V above the highest string VF. This minimizes power dissipation in the current sinks and boost stage. Measured data shows up to 28% lower power draw versus fixed 36-V boost in a 6-string 10.1-inch tablet backlight at 200 nits, directly extending battery runtime.
Can LP8556TME-E09/NOPB operate without I²C communication?
Yes, LP8556TME-E09/NOPB fully supports standalone operation using only the PWM input pin for brightness control. Its E09 variant is factory-configured for "PWM and I²C" mode but defaults to hardware PWM dimming when SDA/SCL are left unconnected. All critical functions - boost regulation, current sinking, fault detection, and thermal protection - remain active without I²C, making it ideal for cost-sensitive or MCU-limited designs.
What thermal considerations apply to LP8556TME-E09/NOPB in a sealed tablet enclosure?
LP8556TME-E09/NOPB has a junction-to-board thermal resistance (RθJB) of 15.1°C/W in its 20-pin DSBGA package. In a sealed tablet with limited airflow, PCB copper area under the die and thermal vias to inner ground planes are critical. TI recommends ≥200 mm² exposed copper pad with 6+ thermal vias (0.3 mm diameter) to keep junction temperature ≤115°C at 23 mA × 6 channels and 12 V input - well below the 150°C shutdown threshold.
LP8556TME-E09/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:
- 6
- 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-E09/NOPB FAQ
1.How can I place an order for LP8556TME-E09/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TME-E09/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-E09/NOPB reliable?
The price and inventory of LP8556TME-E09/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-E09/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TME-E09/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TME-E09/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TME-E09/NOPB?
LP8556TME-E09/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TME-E09/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-E09/NOPB?
For technical support, including LP8556TME-E09/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TME-E09/NOPB requirements.
6.How does Aetrix verify that LP8556TME-E09/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TME-E09/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-E09/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TME-E09/NOPB?
All LP8556TME-E09/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TME-E09/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-E09/NOPB part is unused and in its original packaging.
Return procedure for LP8556TME-E09/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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