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Texas Instruments LP8556TMX-E06/NOPB
- Part No.:
- LP8556TMX-E06/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TMX-E06/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,783
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Product details
Overview
LP8556TMX-E06/NOPB from Texas Instruments is a white LED backlight driver IC featuring an asynchronous boost converter and six high-precision current sinks, supporting 5-channel LED driving at up to 25 mA per channel, with 16 V–39 V programmable boost output voltage range and PWM-only control mode - designed for tablet LCD backlight systems requiring low audible noise and adaptive dimming.
For engineers reviewing the LP8556TMX-E06/NOPB datasheet, LP8556TMX-E06/NOPB pinout, LP8556TMX-E06/NOPB application, or LP8556TMX-E06/NOPB equivalent, this page delivers verified technical context, package-specific pin functions, real-world design meaning of key specs, and two confirmed alternative parts for LED backlight driver selection in space-constrained portable displays.
Technical Context
The LP8556TMX-E06/NOPB implements an adaptive-output-voltage boost converter with integrated 0.19-Ω MOSFET, operating at 312/625/1250 kHz switching frequencies set via EPROM (no external resistor required), and supports phase-shifted PWM dimming across five active current sinks (LED1–LED5) with 15-bit resolution. Its VBOOST_RANGE = 1 and VBOOST_MAX = 110 configuration enables 16 V–39 V output range.
This variant is factory-programmed for "PWM Only" operation (no I²C interface enabled), uses EN/VDDIO as dual-purpose enable/reference pin, and relies on external RISET and RFSET resistors to set LED current and switching frequency - with built-in OVP (6 threshold options), UVLO, TSD, OCP, and LED open/short detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 5 active current sinks (LED1–LED5); LED6 disabled per E06 EPROM configuration |
| Max LED Current | 25 mA per channel - sets maximum brightness and thermal load for each string |
| Boost Output Range | 16 V to 39 V - supports 3–12 WLEDs in series while minimizing power loss via adaptive headroom control |
| Input Voltage Range | 2.7 V to 20 V on VDD - compatible with single/dual-cell Li-ion battery inputs |
| Switching Frequencies | 312 / 625 / 1250 kHz - selectable via EPROM; higher frequencies allow smaller magnetics and reduced EMI filtering area |
| Dimming Control | PWM-only (no I²C) - requires external 75 Hz–25 kHz PWM signal; supports phase-shifted dimming to suppress acoustic noise |
| Package | 20-pin DSBGA (2.401 mm × 1.74 mm) - ultra-compact footprint for thin tablet bezel integration |
Pinout & Package
LP8556TMX-E06/NOPB is housed in a 20-pin, 0.4-mm pitch DSBGA (YFQ) package measuring 2.401 mm × 1.74 mm (max), optimized for low-profile portable display applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, B1 (SW) | Boost switch drain | Connects to inductor and flyback diode; carries peak switch current up to 1.8 A (DSBGA-limited) |
| A2, B2 (GND_SW) | Switch source ground | Dedicated low-inductance return path for boost switch - must be tied to power ground plane |
| A3 (SDA) | I²C data I/O | No-connect in E06 variant; left floating per datasheet recommendation for PWM-only mode |
| A4 (SCL) | I²C clock input | No-connect in E06 variant; left floating - no I²C functionality enabled |
| B3 (PWM) | PWM dimming input | Accepts 75 Hz–25 kHz logic-level signal; internal 15-bit counter enables fine brightness control |
| B4 (EN / VDDIO) | Enable + I/O reference | Must be driven ≥1.62 V to enable device; supplies reference voltage for PWM, SDA, SCL pins |
| C1 (VDD) | Main supply input | 2.7–20 V input to internal LDO; powers all circuitry except boost switch; CVLDO = 10 µF required on VLDO |
| C2 (VBOOST) | Boost output monitor | Feedback and OVP sense node - connect COUT bank directly adjacent to minimize ringing |
| C3 (FSET) | Frequency set resistor | RFSET connects to GND to set boost/PWM frequency; unused if BOOST_FSET_EN = 0 (E06 default) |
| D1 (VLDO) | LDO output | 3.0 V ±5% regulated output; powers internal logic; requires CVLDO = 10 µF ceramic capacitor |
| D2 (ISET) | LED current set | RISET connects to GND to program 25 mA per channel; value calculated as RISET = 1.215 V / ILED |
| D3 (GND) | Ground | Multiple GND pads (D3, D4, E3, E4) - must be connected to solid ground plane for thermal and noise performance |
| D4 (LED2), E4 (LED1), E3 (LED4), E2 (LED5), E1 (LED6) | Current sink outputs | LED1–LED5 active; LED6 disabled in E06 - each sinks up to 25 mA with <0.5% matching and 200 mV saturation |
| A5 (NC) | No connect | Not bonded; must remain unconnected per TI design guidance |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST control | Maintains minimum sufficient output voltage (16–39 V) to reduce power loss and heat generation in LED strings |
| Phase-shifted PWM dimming | Staggered turn-on of LED channels lowers peak input current and eliminates audible coil whine in thin enclosures |
| Integrated 0.19-Ω MOSFET | Eliminates external high-side switch; enables >90% efficiency at 12 V input / 24 V output with 5×25 mA load |
| Programmable slew rate & spread spectrum | Reduces EMI emissions by >10 dB at fundamental switching frequency without added shielding or filters |
| Comprehensive fault protection | Includes UVLO (2.5 V falling), OCP (1.35 A typical), 6-level OVP, thermal shutdown (150°C), and LED open/short detection |
Applications
| Tablet LCD Backlight | Medical Display Backlight |
|---|---|
|
Use Scenario: 10.1-inch IPS LCD panel in portable diagnostic tablet powered by dual-cell Li-ion battery (7.4 V nominal). IC Role / Device Role / Timing Role: LP8556TMX-E06/NOPB drives five parallel LED strings (each 6 LEDs in series) using adaptive VBOOST and phase-shifted PWM to maintain uniform brightness across temperature. Use Value: Achieves >88% system efficiency at full brightness while suppressing audible noise below 20 kHz - critical for quiet clinical environments. |
Use Scenario: Ruggedized 8-inch medical monitor requiring Class II safety compliance and long-term luminance stability. IC Role / Device Role / Timing Role: LP8556TMX-E06/NOPB serves as primary LED driver with built-in LED open/short detection and thermal shutdown, enabling fail-safe backlight operation during extended imaging sessions. Use Value: Fault reporting via PWM pulse interruption allows host MCU to log errors without I²C bus - simplifying safety-critical firmware architecture. |
| Industrial HMI Display | Automotive Infotainment Display |
|
Use Scenario: Fanless 7-inch HMI panel deployed in factory automation cabinet with ambient temperature ranging –30°C to +70°C. IC Role / Device Role / Timing Role: LP8556TMX-E06/NOPB provides robust 5-channel LED drive with –30°C to +85°C operating range, UVLO hysteresis, and 100% duty-cycle PWM support for maximum brightness in bright ambient light. Use Value: DSBGA package withstands thermal cycling stress better than QFN; adaptive VBOOST maintains consistent luminance despite input voltage sag during motor startup events. |
Use Scenario: 12.3-inch digital instrument cluster with AEC-Q200-compliant power delivery and EMC requirements. IC Role / Device Role / Timing Role: LP8556TMX-E06/NOPB operates as standalone PWM-controlled backlight driver, leveraging spread-spectrum switching and slew-rate control to meet CISPR-25 Level 5 radiated emissions limits. Use Value: Eliminates need for external EMI filters or ferrite beads - reducing BOM cost and PCB area in space-constrained cluster layout. |
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-E06/NOPB | Same DSBGA-20 package, identical pinout, but includes I²C interface enabled and supports 6-channel drive at 25 mA | Required when host processor needs dynamic brightness adjustment or fault register readback via I²C | Select LP8557TME-E06/NOPB only if I²C communication and full 6-channel capability are needed; otherwise LP8556TMX-E06/NOPB offers lower cost and simpler layout |
| TPS61165DRVR | Single-channel 40-V boost LED driver in 6-pin WSON; no integrated current sinks, requires external FET and sense resistor | Suitable for custom multi-string designs where channel count and dimming method are fully user-defined | Choose TPS61165DRVR for flexible, scalable backlight architectures with >6 strings or non-standard dimming schemes; LP8556TMX-E06/NOPB is superior for fixed 5-string tablet integration |
Compared with LP8557TME-E06/NOPB, LP8556TMX-E06/NOPB reduces system complexity by eliminating I²C routing and firmware overhead, while matching thermal performance and efficiency in PWM-only use cases; versus TPS61165DRVR, it delivers faster time-to-market via integrated current sinks and factory-programmed settings, at the expense of design flexibility.
Availability
LP8556TMX-E06/NOPB is available at Aetrix Electronics and suitable for tablet LCD backlight, medical display backlight, industrial HMI display, and automotive infotainment display applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LP8556TMX-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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.
LP8556TMX-E06/NOPB belongs to TI's LED backlight driver product line, engineered specifically for high-efficiency, low-noise, and compact-area LCD backlighting in portable and space-constrained displays - emphasizing adaptive voltage control, integrated power stages, and robust fault coverage.
FAQ
What is the maximum number of LED strings supported by LP8556TMX-E06/NOPB?
LP8556TMX-E06/NOPB supports five active LED current sinks (LED1–LED5) as configured in its factory-programmed EPROM. LED6 is disabled in the E06 variant. Each sink delivers up to 25 mA with <0.5% matching, enabling uniform brightness across five independent LED strings in tablet or medical display applications.
Does LP8556TMX-E06/NOPB support I²C communication?
No, LP8556TMX-E06/NOPB is factory-configured for "PWM Only" operation. Its SDA and SCL pins are no-connects and must be left floating. Communication and configuration rely solely on external PWM signal timing - making it ideal for systems without an I²C master or where firmware simplicity is prioritized.
What boost output voltage range is set for LP8556TMX-E06/NOPB?
LP8556TMX-E06/NOPB is programmed with VBOOST_RANGE = 1 and VBOOST_MAX = 110, resulting in a boost output voltage range of 16 V to 39 V. This range supports 3–12 white LEDs in series per string while maintaining optimal efficiency through adaptive headroom control.
How is LED current set on LP8556TMX-E06/NOPB?
LED current is set using an external resistor (RISET) connected between ISET pin and GND. For 25 mA per channel, RISET = 1.215 V / 0.025 A = 48.6 kΩ (standard 49.9 kΩ 1% resistor). The ISET pin is active in E06 configuration and must not be left floating.
What package type and thermal characteristics apply to LP8556TMX-E06/NOPB?
LP8556TMX-E06/NOPB uses a 20-pin DSBGA (YFQ) package (2.401 mm × 1.74 mm). Its junction-to-ambient thermal resistance (RθJA) is 66.2°C/W, and junction-to-board (RθJB) is 15.1°C/W - requiring a solid thermal pad connection to PCB ground plane for reliable operation at full 25 mA/channel load.
LP8556TMX-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)
LP8556TMX-E06/NOPB FAQ
1.How can I place an order for LP8556TMX-E06/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TMX-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 LP8556TMX-E06/NOPB reliable?
The price and inventory of LP8556TMX-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 LP8556TMX-E06/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TMX-E06/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TMX-E06/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TMX-E06/NOPB?
LP8556TMX-E06/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TMX-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 LP8556TMX-E06/NOPB?
For technical support, including LP8556TMX-E06/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TMX-E06/NOPB requirements.
6.How does Aetrix verify that LP8556TMX-E06/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TMX-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 LP8556TMX-E06/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TMX-E06/NOPB?
All LP8556TMX-E06/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TMX-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 LP8556TMX-E06/NOPB part is unused and in its original packaging.
Return procedure for LP8556TMX-E06/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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