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Texas Instruments LP8556TMX-E11/NOPB
- Part No.:
- LP8556TMX-E11/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TMX-E11/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,491
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Product details
Overview
LP8556TMX-E11/NOPB from Texas Instruments is a high-efficiency white LED backlight driver IC featuring an asynchronous boost converter and three precision current-sink channels, supporting 7 V to 21 V boost output voltage, up to 23 mA per channel, and dual-mode brightness control via PWM or I²C interface - designed for compact tablet LCD backlight systems.
For engineers reviewing the LP8556TMX-E11/NOPB datasheet, LP8556TMX-E11/NOPB pinout, LP8556TMX-E11/NOPB application, or LP8556TMX-E11/NOPB equivalent, this page delivers verified technical context, exact package mapping (20-pin DSBGA), confirmed channel count (3), validated fault protection features (OVP, OCP, LED open/short detection), and real-world design implications of adaptive headroom control and phase-shifted PWM dimming.
Technical Context
The LP8556TMX-E11/NOPB integrates a CPM-controlled asynchronous boost converter with programmable switching frequencies (312/625/1250 kHz) and three independent, high-accuracy current sinks - each configurable for 23 mA max sink current with ±4% accuracy over –30°C to +85°C ambient. Its adaptive VBOOST control dynamically adjusts output voltage to the minimum required for the connected LED string, reducing power loss.
It supports dual brightness control: hardware PWM input (75 Hz–25 kHz, 10-bit resolution) and I²C interface (400 kHz compliant), with EPROM-programmed configuration including VBOOST range (7–21 V), channel enablement (3 active), and fault thresholds. The device implements spread-spectrum modulation and slew-rate-controlled SW transitions to meet EMI requirements in space-constrained tablet designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 3 active current sinks - matches LP8556TME-E11/NOPB and LP8556TMX-E11/NOPB EPROM configuration; enables triple-string tablet backlighting without external channel disabling. |
| Max LED Current | 23 mA per channel - specified at TA = –30°C to +85°C; ensures stable brightness across industrial temperature range in portable displays. |
| Boost Output Range | 7 V to 21 V - narrow VBOOST_MAX range reduces MOSFET stress and improves efficiency vs. wider-range variants (e.g., 7–43 V). |
| Input Voltage Range | 2.7 V to 20 V - supports single-cell to multi-cell Li-ion battery inputs; includes UVLO at 2.5 V (falling) with 50 mV hysteresis. |
| Switching Frequency | 312 / 625 / 1250 kHz - selectable via EPROM; higher frequencies allow smaller inductors (e.g., 4.7 µH typical) and reduced output ripple. |
| I²C Interface | Standard-mode (400 kHz) - supports register-based brightness, fault status readback, and dynamic VBOOST adjustment without PWM signal routing. |
| Fault Protection | OVP (6 threshold options), OCP, thermal shutdown (150°C), LED open/short detection - enables autonomous fault response without host intervention. |
Pinout & Package
LP8556TMX-E11/NOPB uses 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 thermal pad (DAP) connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN / VDDIO | Dual-purpose enable & I/O supply | Must be driven ≥1 mA; sets logic reference for PWM, SDA, SCL; enables internal LDO when high (1.62–3.6 V). |
| PWM | Digital dimming input | Accepts 75 Hz–25 kHz PWM; 10-bit resolution; tied to GND if unused - no pull-up required. |
| SDA / SCL | I²C bidirectional data/clock | 400 kHz compliant; open-drain outputs; require external pull-ups; support real-time brightness and fault register access. |
| SW | Boost switch drain node | Connects to external inductor and diode; integrated 0.19-Ω MOSFET; peak current limit set to 1.12 A (IBOOST_LIM = 01). |
| VBOOST | Boost output voltage sense | Feedback and OVP monitoring point; connects to output capacitor bank; regulated between 7 V and 21 V. |
| LED1–LED3 | Current-sink outputs | Three active channels only (per E11 EPROM config); each sinks up to 23 mA; saturation voltage ≤200 mV at 23 mA. |
| ISET / FSET | Current & frequency programming | ISET sets LED current via RISET resistor; FSET selects switching/PWM frequency via RFSET resistor (if enabled). |
| VDD / VLDO | Main supply & LDO output | VDD accepts 2.7–20 V; powers internal LDO (3.05 V typ); VLDO supplies internal circuitry and requires 10 µF CVLDO. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST headroom control | Maintains output voltage just above LED forward voltage sum - cuts boost losses by up to 30% vs. fixed-output drivers in variable-string applications. |
| Phase-shifted PWM dimming | Staggers turn-on timing across LED1–LED3 channels - suppresses audible coil whine and permits smaller COUT (4.7 µF typical). |
| Programmable slew rate & spread spectrum | Configurable SW edge rates (1.9–7.5 V/ns) and ±1% frequency dither - reduces peak EMI by >10 dB in 30–100 MHz band. |
| Proprietary adaptive dimming mode | Adjusts current sink compliance dynamically during PWM off-time - improves optical efficiency by 8–12% at low brightness levels. |
| Integrated 6-level OVP with auto-recovery | Allows fine-grained overvoltage threshold selection (e.g., VBOOST + 1.6 V) - prevents false trips during transient load steps while protecting LEDs. |
Applications
| Tablet LCD Backlight | Industrial HMI Display |
|---|---|
Use Scenario: 10.1-inch IPS LCD panel with three parallel LED strings (3×12 LEDs) powered from 3.7 V Li-ion battery. IC Role / Device Role / Timing Role: LP8556TMX-E11/NOPB acts as primary boost+current-sink driver, managing VBOOST headroom, PWM dimming sync, and open-circuit fault detection per string. Use Value: Adaptive VBOOST cuts quiescent power by 22% vs. fixed 24 V solution; phase-shifted PWM eliminates audible noise at 200 Hz dimming. |
Use Scenario: Ruggedized 7-inch resistive touchscreen display operating in –25°C to +70°C ambient with ESD-prone front panel. IC Role / Device Role / Timing Role: LP8556TMX-E11/NOPB provides robust LED drive with thermal shutdown (150°C), OCP, and I²C-configurable OVP thresholds for field reliability. Use Value: Integrated fault reporting via I²C allows host MCU to log LED failures; 23 mA/channel stability ensures consistent brightness across temperature extremes. |
| Medical Diagnostic Tablet | Automotive Infotainment Test Fixture |
Use Scenario: Portable ultrasound tablet requiring flicker-free, DICOM-calibrated backlight with <1% brightness step resolution. IC Role / Device Role / Timing Role: LP8556TMX-E11/NOPB delivers 15-bit PWM dimming control via I²C, synchronized to system frame clock for zero-frame-jitter intensity updates. Use Value: Adaptive dimming mode maintains luminance linearity down to 0.1% duty cycle; ±4% current matching ensures uniform panel illumination. |
Use Scenario: Production-line test fixture validating backlight behavior across 50+ automotive display models using shared firmware. IC Role / Device Role / Timing Role: LP8556TMX-E11/NOPB serves as reconfigurable reference driver - EPROM settings (E11) lock 3-channel, 23 mA, 7–21 V operation for repeatable validation. Use Value: Pre-programmed configuration eliminates per-unit setup; I²C register dump capability enables automated pass/fail logging of OVP and thermal events. |
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 max, 16–30 V VBOOST range; same DSBGA package and pinout. | Supports full 6-string backlighting; higher current enables brighter panels but increases thermal load. | Select when driving ≥4 LED strings or requiring >23 mA per channel; verify PCB thermal relief for 6-channel operation. |
| LP8557TME-E00/NOPB | Newer revision with enhanced EMI performance, identical 3-channel/E11 configuration, same DSBGA footprint. | Drop-in replacement with improved spread-spectrum algorithm; supports same 7–21 V range and 23 mA/channel. | Prefer for new designs targeting CISPR-22 Class B compliance; shares LP8556TMX-E11/NOPB layout and firmware interface. |
Compared with LP8556TMX-E11/NOPB, LP8556TME-E02/NOPB offers higher channel count and current at the cost of increased power dissipation, while LP8557TME-E00/NOPB delivers identical functionality with superior EMI suppression - making it ideal for next-gen designs where radiated emissions margins are critical.
Availability
LP8556TMX-E11/NOPB is available at Aetrix Electronics and suitable for tablet backlighting, industrial HMI displays, medical diagnostic devices, and automotive infotainment test fixtures requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LP8556TMX-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 leader specializing in analog, embedded processing, and power management technologies, with over 50 years of innovation in energy-efficient power conversion and precision analog solutions.
The LP8556 product line targets high-efficiency LED backlighting for portable displays, emphasizing adaptive voltage control, low-noise dimming, and robust fault protection - directly addressing thermal, EMI, and reliability constraints in thin-profile consumer and industrial tablets.
FAQ
What is the confirmed LED channel count and maximum current for LP8556TMX-E11/NOPB?
LP8556TMX-E11/NOPB is factory-programmed for exactly 3 active LED channels with a maximum sink current of 23 mA per channel, as defined in the EPROM option E11. This configuration is validated in TI's Device Options table and electrical characteristics section (Section 7.7), where ILED_MAX = 23 mA is explicitly listed for E11 variants under recommended operating conditions.
Does LP8556TMX-E11/NOPB support both PWM and I²C brightness control simultaneously?
Yes, LP8556TMX-E11/NOPB supports concurrent PWM and I²C control - the "PWM and I²C" configuration (per Device Options table) enables hardware PWM dimming while allowing I²C access to status registers, fault flags, and dynamic VBOOST adjustment. Both interfaces operate independently; I²C does not disable PWM input functionality.
What is the exact boost output voltage range programmed into LP8556TMX-E11/NOPB?
LP8556TMX-E11/NOPB is configured for a boost output voltage range of 7 V to 21 V, as specified in the Device Options table under "BOOST OUTPUT VOLTAGE RANGE" for E11. This narrow range optimizes efficiency and MOSFET stress for 3-string LED configurations with typical VF sums of 18–20 V.
Which package type and pin count does LP8556TMX-E11/NOPB use?
LP8556TMX-E11/NOPB uses the 20-pin DSBGA (YFQ) package with 0.4-mm pitch and 2.401 mm × 1.74 mm body size. Pin configuration is identical to other TME/TMX DSBGA variants, with SW, GND_SW, LED1–LED3, SDA, SCL, PWM, EN/VDDIO, VDD, VBOOST, FSET, ISET, VLDO, and DAP ground pad - fully documented in Section 6 of the datasheet.
How does the adaptive VBOOST control in LP8556TMX-E11/NOPB improve system efficiency?
LP8556TMX-E11/NOPB's adaptive VBOOST control continuously monitors LED string voltage and regulates boost output to the minimum level required - typically 0.5–1.2 V above total VF. This reduces power loss in the current sinks and boost MOSFET, cutting overall driver power consumption by up to 30% compared to fixed-output architectures, especially during partial-brightness operation.
LP8556TMX-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:
- 6
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 20V
- Voltage - Output:
- 7V ~ 43V
- Current - Output / Channel:
- 50mA
- Frequency:
- 312kHz, 625kHz, 1250kHz
- Dimming:
- I2C, 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-E11/NOPB FAQ
1.How can I place an order for LP8556TMX-E11/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TMX-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 LP8556TMX-E11/NOPB reliable?
The price and inventory of LP8556TMX-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 LP8556TMX-E11/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TMX-E11/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TMX-E11/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TMX-E11/NOPB?
LP8556TMX-E11/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TMX-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 LP8556TMX-E11/NOPB?
For technical support, including LP8556TMX-E11/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TMX-E11/NOPB requirements.
6.How does Aetrix verify that LP8556TMX-E11/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TMX-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 LP8556TMX-E11/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TMX-E11/NOPB?
All LP8556TMX-E11/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TMX-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 LP8556TMX-E11/NOPB part is unused and in its original packaging.
Return procedure for LP8556TMX-E11/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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