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Texas Instruments LP8556TMX-E05/NOPB
- Part No.:
- LP8556TMX-E05/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TMX-E05/NOPB.pdf
- Description:
- IC LED DRIVER RGLTR 25MA 20DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8556TMX-E05/NOPB from Texas Instruments is a high-efficiency white LED backlight driver IC featuring an asynchronous boost converter with integrated 0.19-Ω MOSFET and six precision current sinks, supporting 2.7–20 V input, 7–43 V boost output, up to 25 mA per channel, and I²C/PWM dual-mode brightness control for tablet LCD backlight systems.
For engineers reviewing the LP8556TMX-E05/NOPB datasheet, LP8556TMX-E05/NOPB pinout, LP8556TMX-E05/NOPB application, or LP8556TMX-E05/NOPB equivalent, this device offers programmable switching frequencies (312/625/1250 kHz), adaptive dimming, phase-shifted PWM, and full fault protection (OVP, OCP, UVLO, TSD, LED open/short detection) in a space-saving 20-pin DSBGA package.
Technical Context
The LP8556TMX-E05/NOPB implements adaptive output voltage control to dynamically minimize VBOOST based on LED string forward voltage, reducing power loss. Its CPM (current-programmed mode) boost controller uses internal 20-MHz oscillator timing and supports three fixed switching frequencies set via EPROM configuration - no external resistor required for this variant.
This "Non-programmed" variant (E05) is factory-configured for evaluation use and can be programmed to any available option; it enables all six LED channels, supports 25 mA max per sink, and includes I²C interface (SDA/SCL), PWM dimming input, and analog programming pins (FSET, ISET, VLDO) for flexible system integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 20 V - powers internal LDO and enables multi-cell Li-ion battery operation without external regulation. |
| Boost Output Range | 7 V to 43 V - supports 3–12 series WLEDs per channel with adaptive headroom control to minimize power dissipation. |
| LED Channel Count | 6 - fully configurable current sinks (LED1–LED6), each independently controllable via I²C or synchronized PWM. |
| Max Sink Current | 25 mA per channel - precise constant-current drive with ±4% accuracy over –30°C to +85°C ambient. |
| Switching Frequencies | 312 / 625 / 1250 kHz - selectable via EPROM; higher frequencies allow smaller inductors and reduced EMI with spread-spectrum modulation. |
| I²C Interface | Standard-mode (400 kHz) - enables dynamic brightness, fault status readback, and register-based configuration without additional GPIOs. |
| Fault Protection | OVP (6 thresholds), OCP, UVLO, TSD, LED open/short detection - ensures robust operation and prevents damage during abnormal conditions. |
Pinout & Package
LP8556TMX-E05/NOPB is housed in a 20-pin, 0.4-mm pitch DSBGA package (2.401 mm × 1.74 mm, max), optimized for ultra-thin tablet designs with minimal PCB footprint and thermal resistance (RθJA = 66.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Boost switch drain | Connects to inductor and flyback diode; carries peak currents up to 2.07 A (DSBGA-limited); requires low-inductance layout. |
| GND_SW | Switch source ground | Dedicated power ground for MOSFET return path; must be isolated from signal GND to prevent noise coupling. |
| SDA / SCL | I²C data/clock | Open-drain bidirectional interface; supports standard-mode (400 kHz) communication with host processor for real-time control. |
| PWM | Digital dimming input | Accepts 75 Hz–25 kHz PWM signal; enables 15-bit resolution dimming without I²C overhead. |
| EN / VDDIO | Enable & I/O supply | Active-high chip enable and logic reference; must be driven by ≥1 mA capable source (1.62–3.6 V range). |
| VDD | Main power input | Supplies internal LDO (2.7–20 V); powers core logic, boost gate driver, and current sinks. |
| VBOOST | Boost output node | Feedback and OVP sense point; connects to output capacitor bank; voltage dynamically adjusted per LED string requirements. |
| ISET | Current reference | Connects RISET resistor to GND to set nominal LED current; floating if disabled via register. |
| FSET | Frequency selection | Configures switching frequency via external RFSET resistor; left floating when EPROM-controlled (as in E05 variant). |
| VLDO | LDO output | 3.0 V ±5% regulated output; powers internal circuitry and may supply external logic (CVLDO = 10 µF required). |
| LED1–LED6 | Current sink outputs | High-precision, matched sinks (0.5% matching typical); each drives one WLED string cathode to GND. |
| GND | Signal ground | Reference for analog/digital circuits; must be connected to system GND plane with low-impedance path. |
| NC | No connect | Pin 8 (DSBGA) is unconnected; must remain unpopulated or floated - no routing or soldering. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST Control | Minimizes boost voltage to just above LED string Vf, reducing power loss and heat generation across varying temperature and aging conditions. |
| Phase-Shifted PWM Dimming | Staggered channel PWM timing eliminates mechanical resonance in LED arrays, eliminating audible coil whine and enabling smaller output capacitors. |
| Programmable Slew Rate & Spread Spectrum | Reduces EMI peaks by >10 dB through controlled SW edge rates and frequency dithering - simplifies EMC compliance testing. |
| 15-Bit PWM Dimming Resolution | Enables smooth, flicker-free brightness transitions from 0.02% to 100% duty cycle across 7 frequency bands (75 Hz–39 kHz). |
| Full Fault Diagnostics | Real-time detection and latching of LED open/short, overvoltage (6 thresholds), overcurrent, UVLO, and thermal shutdown - accessible via I²C STATUS register. |
Applications
| Tablet LCD Backlight | Medical Display Backlight |
|---|---|
Use Scenario: 10.1-inch IPS LCD panel in portable diagnostic tablet requiring uniform, flicker-free illumination under battery and AC operation. IC Role / Device Role / Timing Role: Primary LED driver IC managing six parallel WLED strings with adaptive headroom and I²C-based brightness scaling. Use Value: 25 mA per channel and 0.5% current matching ensure consistent luminance across display area; phase-shifted PWM eliminates audible noise during clinical use. | Use Scenario: High-reliability surgical monitor with redundant backlight control and fault logging capability. IC Role / Device Role / Timing Role: Safety-critical backlight controller providing real-time LED open/short detection and thermal shutdown with latchable fault reporting. Use Value: Six independent current sinks and 6-level OVP allow graceful degradation (e.g., continue operation with 5 strings if one fails), meeting IEC 62304 Class B requirements. |
| Industrial HMI Panel | Automotive Infotainment Display |
Use Scenario: Ruggedized 7-inch HMI in factory automation environment operating from 12 V DC supply with wide ambient temperature range. IC Role / Device Role / Timing Role: Robust LED driver supporting –30°C to +85°C operation, UVLO at 2.5 V, and thermal shutdown at 150°C. Use Value: Wide 2.7–20 V input range accommodates brownout conditions; 66.2°C/W thermal resistance enables convection-cooled design without heatsink. | Use Scenario: 12.3-inch digital instrument cluster with dynamic dimming profiles synchronized to ambient light sensor and CAN bus commands. IC Role / Device Role / Timing Role: I²C-configurable backlight driver interfacing with MCU over automotive-grade bus; supports rapid brightness ramping (10 ms turn-on delay). Use Value: I²C register access enables per-channel dimming curves and fault status polling; 400 kHz I²C speed meets automotive timing constraints. |
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 | Pre-programmed for "PWM and I²C" mode, 6-channel, 25 mA, 16–30 V VBOOST range; fixed EPROM config. | Production-ready variant with narrower VBOOST range; lacks E05's field-programmability. | Select for volume production where fixed configuration suffices and evaluation flexibility is unnecessary. |
| LP8556SQX-E09/NOPB | WQFN-24 package (4.0 × 4.0 mm), 6-channel, 23 mA, 16–34.5 V VBOOST; higher thermal performance (RθJA = 35.0°C/W). | Better power handling (up to 2.6 A SW current) and thermal margin; larger footprint than DSBGA. | Select when higher continuous output current or improved thermal management is required in non-space-constrained designs. |
Compared with LP8556TME-E02/NOPB, LP8556TMX-E05/NOPB offers field-programmable configuration but shares identical 6-channel, 25 mA capability; versus LP8556SQX-E09/NOPB, it trades thermal performance and current headroom for ultra-compact DSBGA packaging ideal for thin-profile tablets.
Availability
LP8556TMX-E05/NOPB is available at Aetrix Electronics and suitable for tablet LCD backlighting, medical display illumination, industrial HMI panels, and automotive infotainment displays requiring stable component supply and long-term design-in support.
Supply support for LP8556TMX-E05/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 high-efficiency power conversion and precision analog solutions.
The LP8556 product line delivers highly integrated LED backlight drivers for portable displays, designed specifically for low-power, high-reliability, and EMI-sensitive applications in space-constrained consumer and industrial devices.
FAQ
What is the primary function of the LP8556TMX-E05/NOPB in a display system?
The LP8556TMX-E05/NOPB serves as a high-efficiency white LED backlight driver IC, integrating an asynchronous boost converter and six precision current sinks to power and control LED strings in LCD displays. It dynamically adjusts VBOOST for optimal efficiency, supports both I²C and PWM dimming, and provides comprehensive fault protection - making it ideal for tablet and portable display applications where power, size, and reliability are critical.
Does the LP8556TMX-E05/NOPB require external programming resistors for frequency selection?
No. The LP8556TMX-E05/NOPB is the "Non-programmed" variant configured for evaluation use and supports switching frequency selection (312/625/1250 kHz) via internal EPROM settings - eliminating the need for external FSET resistors. The FSET pin may be left floating, unlike variants requiring resistor-based configuration.
What package type and thermal characteristics does the LP8556TMX-E05/NOPB use?
The LP8556TMX-E05/NOPB uses a 20-pin DSBGA package (2.401 mm × 1.74 mm, max) with 0.4-mm pitch. Its thermal resistance is RθJA = 66.2°C/W, suitable for convection-cooled thin-profile designs. For higher-power applications, the WQFN-24 variant (e.g., LP8556SQX-E09/NOPB) offers lower RθJA = 35.0°C/W and higher current capability.
How does the LP8556TMX-E05/NOPB handle LED fault detection?
The LP8556TMX-E05/NOPB integrates real-time LED open and short detection per channel, along with overvoltage protection (6 programmable thresholds), overcurrent protection, UVLO, and thermal shutdown. Fault status is latched and readable via the I²C STATUS register, enabling system-level diagnostics and fail-safe response without external monitoring circuitry.
Can the LP8556TMX-E05/NOPB be used in automotive applications?
The LP8556TMX-E05/NOPB operates across –30°C to +85°C ambient temperature and supports 2.7–20 V input, making it suitable for certain automotive infotainment displays. However, it is not AEC-Q100 qualified; for mission-critical automotive applications, TI recommends automotive-grade alternatives such as the LP8864-Q1. Always verify compliance with specific vehicle subsystem requirements before deployment.
LP8556TMX-E05/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:
- -
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DSBGA (2.04x1.78)
LP8556TMX-E05/NOPB FAQ
1.How can I place an order for LP8556TMX-E05/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TMX-E05/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-E05/NOPB reliable?
The price and inventory of LP8556TMX-E05/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-E05/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TMX-E05/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TMX-E05/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TMX-E05/NOPB?
LP8556TMX-E05/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TMX-E05/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-E05/NOPB?
For technical support, including LP8556TMX-E05/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TMX-E05/NOPB requirements.
6.How does Aetrix verify that LP8556TMX-E05/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TMX-E05/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-E05/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TMX-E05/NOPB?
All LP8556TMX-E05/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TMX-E05/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-E05/NOPB part is unused and in its original packaging.
Return procedure for LP8556TMX-E05/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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