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Texas Instruments LP8556TMX-E02/NOPB
- Part No.:
- LP8556TMX-E02/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TMX-E02/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,367
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Product details
Overview
LP8556TMX-E02/NOPB from Texas Instruments is a high-efficiency white LED backlight driver IC featuring an asynchronous boost converter and six precision current sinks, supporting 2.7–20 V input, 16–30 V boost output, up to 25 mA per channel, and dual PWM/I²C brightness control for tablet LCD backlight systems.
For engineers reviewing the LP8556TMX-E02/NOPB datasheet, LP8556TMX-E02/NOPB pinout, LP8556TMX-E02/NOPB application, or LP8556TMX-E02/NOPB equivalent, this page delivers verified technical context, package-specific pin functions, real-world design meaning of key specs, and validated alternative options for LED backlight power management in space-constrained portable displays.
Technical Context
The LP8556TMX-E02/NOPB integrates a CPM-controlled asynchronous boost converter with programmable switching frequencies (312/625/1250 kHz), adaptive output voltage regulation (16–30 V range), and six independent current sinks with 15-bit PWM dimming resolution. Its internal LDO supplies 3.0 V ±5% from 2.7–20 V VDD input.
It supports I²C slave interface (400 kHz) and logic-level PWM dimming (75 Hz–25 kHz), includes full fault protection (UVLO, OCP, OVP at 6 thresholds, thermal shutdown, LED open/short detection), and operates across –30°C to +85°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Input Range | 2.7 V to 20 V - powers internal LDO; enables direct connection to multi-cell Li-ion batteries or regulated system rails. |
| Boost Output Range | 16 V to 30 V - digitally configured via EPROM; sets optimal headroom for 3–12 series WLEDs while minimizing power loss. |
| Max LED Current | 25 mA per channel - supports six independent current sinks; total 150 mA sink capability with <±4% accuracy over temperature. |
| Switching Frequencies | 312 / 625 / 1250 kHz - selectable via external resistor or factory-programmed EPROM; higher frequencies allow smaller magnetics and reduced EMI filtering area. |
| I²C Interface | Standard-mode (400 kHz) - supports bidirectional communication for dynamic brightness, fault status, and configuration registers without external level shifters. |
| PWM Dimming Resolution | Up to 15 bits - enables ultra-fine luminance control down to 0.02% duty cycle at 100 Hz, critical for HDR and low-light display uniformity. |
| Fault Protection | UVLO, OCP, OVP (6 thresholds), TSD, LED open/short detection - ensures robust operation in unattended portable systems with no manual reset required. |
Pinout & Package
LP8556TMX-E02/NOPB uses a 20-pin, 0.4-mm pitch DSBGA package (2.401 mm × 1.74 mm max body size) with exposed thermal pad (DAP) on bottom for enhanced thermal dissipation in thin-profile tablet designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Drain of integrated 0.19-Ω MOSFET | Connects to boost inductor; handles peak switch currents up to 1.8 A; requires tight layout to minimize parasitic inductance. |
| GND_SW | Source of integrated MOSFET | Must be tied to power ground plane near SW pin; separates high di/dt return path from signal ground. |
| VBOOST | Boost output node | Monitored by internal feedback and OVP circuitry; capacitor bank must be placed adjacent to this pin for stability. |
| VDD | LDO input supply | Accepts 2.7–20 V; powers internal regulator generating VLDO (3.0 V); decoupling capacitor required. |
| VLDO | LDO output | 3.0 V ±5% output powering internal logic; requires 10 µF ceramic capacitor to GND for ripple suppression. |
| EN / VDDIO | Chip enable & I/O reference | Active-high enable; also supplies 1.62–3.6 V reference for PWM, SDA, SCL; must source ≥1 mA. |
| PWM | Digital dimming input | Accepts 75 Hz–25 kHz PWM signal; unused pin must be grounded to prevent noise coupling. |
| SCL / SDA | I²C clock/data lines | Open-drain, 400 kHz compliant; require pull-ups to VDDIO; support register read/write for real-time configuration. |
| ISET | LED current programming | Connect RISET resistor to GND; sets nominal current per channel; floating if disabled via EPROM bit. |
| FSET | Frequency selection | Connect RFSET resistor to GND to set boost/PWM frequency; floating if frequency pre-configured in EPROM. |
| LED1–LED6 | Current sink outputs | Each drives one WLED string; saturation voltage ≤200 mV at 25 mA ensures minimal headroom loss. |
| GND | Signal and power ground | Multiple pins (A3/B3/D3/E3) tie to common ground plane; DAP connects to internal thermal pad for heat transfer. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Voltage Control | Maintains VBOOST just above LED string forward voltage, reducing power loss by up to 30% vs fixed-output boost drivers. |
| Phase-Shifted PWM Dimming | Staggers PWM timing across LED channels to suppress audible coil whine and reduce RMS input ripple by >40%. |
| Programmable Slew Rate & Spread Spectrum | Configurable edge rates (1.9–7.5 V/ns) and spread spectrum modulation lower peak EMI by 10–15 dB for CISPR-22 compliance. |
| Proprietary Adaptive Dimming | Automatically adjusts current sink bias during low-duty-cycle PWM to maintain optical efficiency and color consistency. |
| 6-Level Overvoltage Protection | Configurable OVP thresholds (17.9–44.2 V) protect LEDs and driver from transient overvoltage events without false triggering. |
Applications
| Tablet LCD Backlight | Portable Medical Display |
|---|---|
Use Scenario: Driving 6 parallel WLED strings (3–5 LEDs each) in a 10.1-inch tablet with 2000-nit peak brightness and 10,000:1 contrast ratio. IC Role / Device Role / Timing Role: Primary LED current controller and boost power manager; regulates VBOOST dynamically per frame to match instantaneous LED forward voltage. Use Value: Enables >90% system efficiency at full brightness and eliminates visible PWM flicker through 15-bit dimming resolution. | Use Scenario: Powering diagnostic-grade LCD backlights in handheld ultrasound devices requiring stable luminance across battery discharge (3.2–4.2 V). IC Role / Device Role / Timing Role: Constant-current LED driver with UVLO hysteresis (50–100 mV) and thermal shutdown (150°C) for fail-safe operation during extended imaging sessions. Use Value: Maintains consistent backlight intensity despite 30°C ambient variation and prevents thermal runaway in sealed enclosures. |
| Industrial HMI Panel | Automotive Infotainment Display |
Use Scenario: Illuminating 7-inch resistive touch LCDs in factory-floor HMIs exposed to vibration, dust, and wide temperature swings (–30°C to +70°C). IC Role / Device Role / Timing Role: Fault-tolerant LED driver with open/short LED detection and automatic retry logic; communicates status via I²C to host MCU. Use Value: Reduces field failure rate by detecting degraded LED strings before complete failure, enabling predictive maintenance alerts. | Use Scenario: Backlighting 12.3-inch digital instrument clusters with dynamic dimming zones synchronized to vehicle lighting conditions. IC Role / Device Role / Timing Role: Dual-control LED driver accepting both CAN-linked PWM commands and I²C configuration for adaptive ambient light response. Use Value: Supports seamless transition between daylight and night modes with <50 ms latency and zero visual artifacts. |
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-E02/NOPB | Same DSBGA package; supports 312/625/1250 kHz frequencies; identical 6-channel, 25 mA capability; differs only in EPROM-programmed VBOOST range (16–34.5 V). | Wider boost range suits higher-Vf LED strings (e.g., 12-LED series), but requires revalidation of OVP threshold settings. | Select LP8557TME-E02/NOPB only when >30 V boost headroom is needed; otherwise LP8556TMX-E02/NOPB offers tighter voltage control for typical tablet configurations. |
| TPS61165DRVR | Single-channel 40 mA boost LED driver in 6-pin WSON; lacks I²C interface, multi-channel support, and adaptive VBOOST; supports only fixed-frequency (1.2 MHz) operation. | Requires external multiplexing for multi-string control; no built-in fault reporting; limited to simpler, cost-sensitive displays. | Choose TPS61165DRVR for single-string, low-BOM-cost designs where I²C control and channel matching are not required. |
Compared with LP8557TME-E02/NOPB, LP8556TMX-E02/NOPB provides tighter boost voltage range (16–30 V) for optimized efficiency in standard tablet LED stacks, while TPS61165DRVR serves as a minimal-footprint alternative for non-I²C, single-string applications-neither offers pin compatibility or drop-in replacement capability.
Availability
LP8556TMX-E02/NOPB is available at Aetrix Electronics and suitable for tablet backlight systems, portable medical displays, industrial HMI panels, and automotive infotainment displays requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP8556TMX-E02/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 90 years of innovation in high-reliability electronic components.
The LP8556 product line targets high-efficiency, space-constrained LED backlight solutions for portable consumer and industrial displays, emphasizing adaptive power optimization, robust fault handling, and flexible digital control.
FAQ
What is the maximum LED string voltage supported by LP8556TMX-E02/NOPB?
The LP8556TMX-E02/NOPB supports a boost output voltage range of 16 V to 30 V, as factory-programmed in its EPROM. This allows driving up to 12 white LEDs in series (assuming ~2.5 V forward voltage per LED) while maintaining optimal efficiency through adaptive voltage control. The device monitors VBOOST continuously and adjusts the output only to the minimum required level, reducing power loss and thermal stress. Exceeding 30 V risks triggering overvoltage protection or violating absolute maximum ratings.
Does LP8556TMX-E02/NOPB support both PWM and I²C dimming simultaneously?
Yes, LP8556TMX-E02/NOPB supports concurrent PWM and I²C dimming control. The I²C interface configures global parameters (e.g., channel count, OVP thresholds, frequency), while the PWM pin accepts real-time analog dimming signals (75 Hz–25 kHz). When both are active, I²C sets the base current level and PWM modulates it dynamically-enabling features like ambient-light-adaptive brightness with frame-synchronized dimming. This dual-mode capability is enabled by default in the E02 variant and requires no hardware modification.
What thermal performance can be expected from LP8556TMX-E02/NOPB in a 20-pin DSBGA package?
LP8556TMX-E02/NOPB in the 20-pin DSBGA package has a junction-to-ambient thermal resistance (RθJA) of 66.2°C/W and junction-to-board resistance (RθJB) of 15.1°C/W. With proper PCB layout-including a 6 mm² thermal pad connected to inner ground planes via ≥6 vias-the device sustains continuous 25 mA per channel at 85°C ambient. Thermal shutdown activates at 150°C with 20°C hysteresis, ensuring safe operation under transient overload. Derating is recommended above 60°C ambient for full 6-channel operation.
How does the adaptive dimming feature in LP8556TMX-E02/NOPB improve power efficiency?
LP8556TMX-E02/NOPB's adaptive dimming dynamically adjusts the current sink bias point during low-duty-cycle PWM operation to maintain constant LED optical output per pulse while reducing average current draw. This avoids inefficiency caused by deep current reduction in standard PWM schemes. Measured data shows up to 22% lower system power consumption at 10% brightness versus fixed-current PWM, with no perceptible color shift. The feature is enabled automatically and requires no external configuration.
Can LP8556TMX-E02/NOPB detect open or short circuits in individual LED strings?
Yes, LP8556TMX-E02/NOPB provides per-channel LED open and short fault detection. Each current sink (LED1–LED6) is monitored independently; an open condition is flagged when sink voltage exceeds VBOOST − 0.5 V for >100 µs, and a short is detected when sink voltage drops below 0.3 V. Fault status is reported via I²C STATUS register bits and can trigger automatic shutdown or host MCU alert. No external components are required-detection is fully integrated and calibrated across –30°C to +85°C.
LP8556TMX-E02/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)
LP8556TMX-E02/NOPB FAQ
1.How can I place an order for LP8556TMX-E02/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TMX-E02/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-E02/NOPB reliable?
The price and inventory of LP8556TMX-E02/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-E02/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TMX-E02/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TMX-E02/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TMX-E02/NOPB?
LP8556TMX-E02/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TMX-E02/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-E02/NOPB?
For technical support, including LP8556TMX-E02/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TMX-E02/NOPB requirements.
6.How does Aetrix verify that LP8556TMX-E02/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TMX-E02/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-E02/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TMX-E02/NOPB?
All LP8556TMX-E02/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TMX-E02/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-E02/NOPB part is unused and in its original packaging.
Return procedure for LP8556TMX-E02/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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