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Texas Instruments LP8556TMX-E03/NOPB
- Part No.:
- LP8556TMX-E03/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TMX-E03/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,718
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Product details
Overview
LP8556TMX-E03/NOPB from Texas Instruments is a high-efficiency LED backlight driver IC featuring an integrated asynchronous boost converter and five programmable current-sink channels for white LED arrays. It operates with 2.7–20 V input, delivers up to 34.5 V boost output, supports PWM-only dimming control, and delivers up to 20 mA per channel - optimized for tablet LCD backlighting in space-constrained designs.
For engineers reviewing the LP8556TMX-E03/NOPB datasheet, LP8556TMX-E03/NOPB pinout, LP8556TMX-E03/NOPB application, or LP8556TMX-E03/NOPB equivalent, this page provides verified package mapping (20-pin DSBGA), confirmed pin functions, exact channel count (5), validated boost voltage range (16–34.5 V), and real-world I²C/PWM interface behavior - all extracted from TI's production-grade SNVS871M datasheet (Rev M, June 2020).
Technical Context
The LP8556TMX-E03/NOPB implements adaptive output voltage control to dynamically minimize VBOOST based on LED string forward voltage, reducing power loss and thermal stress. Its boost converter uses current-programmed mode (CPM) control with soft-start and selectable switching frequencies (312/625/1250 kHz) set via EPROM configuration - no external resistor required for this variant.
This E03 variant is factory-configured for "PWM Only" operation (no I²C interface enabled), with fixed 5-channel operation, 20 mA max per channel, and VBOOST range locked to 16–34.5 V. It integrates a 0.19-Ω internal MOSFET switch, supports phase-shifted PWM dimming to suppress audible noise, and includes full fault protection: LED open/short detection, OVP (6 thresholds), OCP, UVLO, and thermal shutdown.
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; LDO input stage enables stable internal biasing. |
| Boost Output Voltage Range | 16 V to 34.5 V - supports 3–10 WLEDs in series per channel; adaptive headroom control minimizes power dissipation. |
| LED Channel Count | 5 channels - fixed configuration for E03 variant; each channel is a precision current sink with ±4% accuracy over –30°C to +85°C. |
| Max Current per Channel | 20 mA - sufficient for medium-brightness tablet backlights; matched within 0.5% typical between channels. |
| Switching Frequency | 312 / 625 / 1250 kHz - selectable via EPROM; higher frequencies allow smaller magnetics and reduced EMI filtering area. |
| Dimming Interface | PWM-only (no I²C) - requires external 75 Hz–25 kHz PWM signal; supports 15-bit resolution and phase-shifted timing to reduce acoustic noise. |
| Fault Protection | LED open/short, OVP (6 thresholds), OCP, UVLO, TSD - autonomous shutdown and flag reporting ensure system-level reliability without host intervention. |
Pinout & Package
LP8556TMX-E03/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 PCBs with bottom-side soldering and minimal board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN / VDDIO | Dual-purpose enable & I/O supply | Must be driven ≥1.62 V to enable device; supplies logic threshold reference for PWM, SDA, SCL - not used for I²C in E03 variant. |
| PWM | Digital dimming input | Accepts 75 Hz–25 kHz PWM signal; internal 15-bit counter enables fine brightness control; tied to GND if unused. |
| VDD | Main power input | 2.7–20 V input to internal LDO; powers entire IC including boost gate driver and analog blocks. |
| VBOOST | Boost converter output | High-voltage rail (16–34.5 V); feedback and OVP sensing point; requires low-ESR capacitor placement adjacent to pin. |
| SW | Power switch drain | Connects to boost inductor; internal 0.19-Ω MOSFET switch node; high dV/dt demands tight layout and ground stitching. |
| GND_SW | Switch source return | Dedicated Kelvin return for SW current sense; must be routed separately from digital/analog GND to avoid noise coupling. |
| LED1–LED5 | Current-sink outputs | Five independent, matched sinks (20 mA max); each connects to cathode of LED string; open-drain operation with 200 mV saturation. |
| ISET | Current programming reference | Resistor (RISET) sets full-scale current; floating when disabled - E03 uses factory-trimmed value for 20 mA. |
| FSET | Frequency selection | Configures boost/PWM frequency via EPROM in E03; left unconnected as no external resistor needed. |
| VLDO | LDO output | 3.0 V ±5% regulated output; powers internal logic; requires 10 µF CVLDO capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST Control | Reduces output voltage to minimum required for LED string conduction - cuts power loss by up to 30% vs. fixed-output boost drivers. |
| Phase-Shifted PWM Dimming | Staggers turn-on timing across LED channels to lower peak input current and eliminate audible coil whine in thin-form-factor tablets. |
| Integrated 0.19-Ω Power MOSFET | Eliminates external high-side switch; reduces BOM count and layout complexity while maintaining >90% efficiency at 12 V input / 24 V output. |
| Programmable Slew Rate & Spread Spectrum | Configurable edge rates (3.7–7.5 V/ns) and spread spectrum modulation suppress EMI peaks - simplifies FCC/CE compliance testing. |
| Comprehensive Fault Detection | Autonomous detection of LED open/short, overvoltage (6 thresholds), overcurrent, UVLO, and thermal shutdown - no firmware required. |
Applications
| Tablet LCD Backlighting | Industrial HMI Display |
|---|---|
Use Scenario: 7–10 inch tablet with dual-zone WLED backlight requiring uniform luminance and low acoustic noise. IC Role / Device Role / Timing Role: Primary LED driver IC managing five parallel current-sink channels, adaptive boost regulation, and PWM-based brightness control. Use Value: Phase-shifted PWM eliminates coil whine; adaptive VBOOST reduces thermal load on battery and PCB; 20-pin DSBGA enables <10 mm² footprint. |
Use Scenario: Ruggedized industrial panel PC operating in –30°C to +85°C ambient with high-reliability backlight requirements. IC Role / Device Role / Timing Role: Standalone backlight controller with autonomous fault handling and wide-input voltage tolerance for 12/24 V DC systems. Use Value: Full fault protection (OVP, OCP, TSD) ensures fail-safe shutdown; extended temperature rating guarantees operation in harsh environments. |
| Medical Diagnostic Tablet | Automotive Infotainment Display |
Use Scenario: Portable ultrasound or imaging tablet needing flicker-free, DICOM-calibrated backlight with precise dimming linearity. IC Role / Device Role / Timing Role: High-accuracy current sink driver delivering stable 20 mA per channel with <0.5% matching and 15-bit PWM resolution. Use Value: Tight current matching ensures consistent color temperature across display zones; adaptive dimming preserves contrast ratio at low brightness. |
Use Scenario: In-vehicle infotainment display exposed to automotive transients and wide temperature swings. IC Role / Device Role / Timing Role: Robust LED driver supporting 2.7–20 V input range and integrated UVLO/OVP to withstand load-dump and cold-crank conditions. Use Value: Input UVLO (2.5 V falling) prevents brownout-induced instability; 43 V absolute max VBOOST withstands ISO 7637-2 pulse 5a. |
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-E06/NOPB | Same DSBGA package, 5-channel, but rated for 25 mA/channel and 16–39 V VBOOST range. | Supports higher-brightness displays or longer LED strings; requires revalidation of thermal design due to +25% current capability. | Select when higher LED current or wider VBOOST range is needed; pin-compatible but EPROM settings differ. |
| LP8556SQ-E08/NOPB | WQFN-24 package, 4-channel, 23 mA/channel, 16–34.5 V VBOOST - same voltage range but different channel count and package. | Suitable for simpler 4-string designs; larger package eases thermal management but increases PCB area by 3.3×. | Choose for better thermal performance or if WQFN layout is already standardized; not pin-compatible with DSBGA. |
Compared with LP8556TMX-E03/NOPB, LP8556TME-E06/NOPB offers higher current headroom at identical footprint, while LP8556SQ-E08/NOPB trades compactness for thermal margin and reduced channel count - both require validation of EPROM configuration and layout adaptation.
Availability
LP8556TMX-E03/NOPB is available at Aetrix Electronics and suitable for tablet backlighting, industrial HMI displays, and medical diagnostic devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP8556TMX-E03/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 and embedded processing technologies, with leadership in power management, signal chain, and high-reliability IC design.
The LP8556 product line was developed specifically for high-efficiency, low-noise LED backlighting in portable consumer and industrial displays - emphasizing adaptive voltage control, compact packaging, and autonomous fault resilience.
FAQ
What is the maximum LED string voltage supported by LP8556TMX-E03/NOPB?
The LP8556TMX-E03/NOPB supports a boost output voltage range of 16 V to 34.5 V, enabling it to drive up to 10 white LEDs in series (assuming ~3.3 V VF per LED). This range is factory-programmed and cannot be altered in-circuit; exceeding 34.5 V risks triggering overvoltage protection or damage. The adaptive VBOOST control ensures the output remains at the minimum necessary level for the connected LED string.
Does LP8556TMX-E03/NOPB support I²C communication?
No, LP8556TMX-E03/NOPB is configured as a "PWM Only" variant per TI's device options table. Its I²C pins (SDA/SCL) are functional but disabled in EPROM; brightness control is exclusively via the PWM input pin. For I²C-enabled operation, LP8556TME-E02/NOPB or LP8556TME-E11/NOPB must be selected instead.
What is the thermal performance of LP8556TMX-E03/NOPB in its DSBGA package?
LP8556TMX-E03/NOPB in the 20-pin DSBGA package has a junction-to-ambient thermal resistance (RθJA) of 66.2°C/W. At full 5×20 mA load and 12 V input, typical power dissipation is ~180 mW - resulting in ~12°C junction rise above ambient. Proper PCB copper pour under the DAP (exposed die attach pad) is essential to maintain safe operation below the 125°C max junction temperature.
Can LP8556TMX-E03/NOPB drive six LED channels?
No. LP8556TMX-E03/NOPB is factory-configured for exactly five LED channels (LED1–LED5), as specified in TI's Device Options table. The sixth channel (LED6) is disabled in EPROM and electrically isolated. Attempting to connect a load to LED6 will result in no current flow and may trigger open-LED fault detection.
What external components are mandatory for LP8556TMX-E03/NOPB operation?
Mandatory external components for LP8556TMX-E03/NOPB include: (1) input capacitor (≥2.2 µF ceramic) on VDD, (2) boost inductor (4.7 µH typical), (3) boost output capacitor bank (≥4.7 µF low-ESR) on VBOOST, (4) VLDO bypass capacitor (10 µF) on VLDO, and (5) PWM input pull-down resistor (if not actively driven). No ISET or FSET resistors are required - factory-trimmed for 20 mA and fixed frequency.
LP8556TMX-E03/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-E03/NOPB FAQ
1.How can I place an order for LP8556TMX-E03/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TMX-E03/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-E03/NOPB reliable?
The price and inventory of LP8556TMX-E03/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-E03/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TMX-E03/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TMX-E03/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TMX-E03/NOPB?
LP8556TMX-E03/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TMX-E03/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-E03/NOPB?
For technical support, including LP8556TMX-E03/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TMX-E03/NOPB requirements.
6.How does Aetrix verify that LP8556TMX-E03/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TMX-E03/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-E03/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TMX-E03/NOPB?
All LP8556TMX-E03/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TMX-E03/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-E03/NOPB part is unused and in its original packaging.
Return procedure for LP8556TMX-E03/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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