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Texas Instruments LP8556TME-E02/NOPB
- Part No.:
- LP8556TME-E02/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TME-E02/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:445
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Product details
Overview
LP8556TME-E02/NOPB from Texas Instruments is a high-efficiency white LED backlight driver IC featuring an integrated asynchronous boost converter and six precision current sinks, supporting 2.7 V–20 V input, 16 V–30 V boost output, up to 25 mA per channel, and dual PWM/I²C brightness control for tablet LCD applications.
For engineers reviewing the LP8556TME-E02/NOPB datasheet, LP8556TME-E02/NOPB pinout, LP8556TME-E02/NOPB application, or LP8556TME-E02/NOPB equivalent, this page delivers verified technical context, package-specific pin functions, real-world design implications of adaptive dimming and spread-spectrum EMI reduction, and validated alternative options for backlight power management in space-constrained portable displays.
Technical Context
The LP8556TME-E02/NOPB integrates a CPM-controlled asynchronous boost converter with programmable switching frequencies (312/625/1250 kHz), adaptive output voltage regulation (16 V–30 V range), and six independent current sinks with 15-bit PWM dimming resolution. Its internal LDO supplies 3.0 V ±50 mV from 2.7 V–20 V VDD input.
It supports I²C slave interface (400 kHz) and logic-level PWM inputs (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 with DSBGA-20 package thermal resistance RθJA = 66.2°C/W.
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 without external regulators. |
| Boost Output Range | 16 V to 30 V - set via EPROM; matches 3–9 series WLED strings while minimizing power loss through adaptive headroom control. |
| Max LED Current | 25 mA per channel - supports six independent current sinks; ensures uniform brightness across high-resolution tablet backlights. |
| Switching Frequencies | 312 / 625 / 1250 kHz - selectable via EPROM or external resistor; higher frequencies allow smaller inductors and reduced EMI filtering area. |
| I²C Interface Speed | 400 kHz - standard Fast-mode; enables real-time brightness and fault register access without CPU overhead in embedded display controllers. |
| PWM Dimming Resolution | Up to 15 bits - achieves >32,000-step grayscale control; eliminates visible flicker and improves perceived contrast in low-brightness UI modes. |
| Fault Protection | UVLO, OCP, OVP (6 thresholds), TSD, LED open/short detection - autonomous shutdown prevents damage during cable disconnect, overvoltage transients, or thermal overload. |
Pinout & Package
LP8556TME-E02/NOPB uses a 20-pin, 0.4-mm pitch DSBGA package (2.401 mm × 1.74 mm max body size) with bottom-side ball layout optimized for compact tablet PCBs and thermal dissipation via PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN / VDDIO | Dual-purpose enable & I/O supply | Must be driven ≥1 mA; sets logic threshold for PWM/SDA/SCL; enables device when ≥1.62 V; disables all outputs when <0.8 V. |
| PWM | Digital dimming input | Accepts 75 Hz–25 kHz PWM signal; controls brightness directly without I²C traffic; must be grounded if unused. |
| SDA / SCL | I²C bidirectional data/clock | Supports 400 kHz Fast-mode; requires external pull-ups; enables dynamic configuration of dimming curves, OVP thresholds, and channel mapping. |
| VBOOST | Boost converter output | Monitored for feedback and OVP; connects to output capacitor bank; voltage range fixed at 16 V–30 V for this variant. |
| LED1–LED6 | Current sink outputs | Each sinks up to 25 mA; internally matched to ≤0.5% typical; can be individually enabled/disabled via registers or left floating if unused. |
| ISET / FSET | Analog programming inputs | ISET sets LED current via RISET resistor; FSET configures switching/PWM frequency via RFSET; both floatable when EPROM-configured. |
| VDD / VLDO | Main supply & LDO output | VDD powers internal LDO; VLDO provides stable 3.0 V ±50 mV for analog circuitry; CVLDO capacitor required on VLDO. |
| SW / GND_SW | Power MOSFET terminals | SW connects to drain of integrated 0.19-Ω MOSFET; GND_SW is dedicated source return-must be routed to separate ground plane for noise isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive dimming mode | Reduces average LED current during low-brightness operation while maintaining luminance perception-cuts system power by up to 35% vs. linear PWM. |
| Phase-shifted PWM dimming | Staggers turn-on timing across LED channels to suppress audible coil whine and reduce peak input current ripple by >40%. |
| Spread-spectrum modulation | Modulates switching frequency ±1% to lower EMI peak amplitude by 10 dB; eliminates need for ferrite beads in cost-sensitive tablet designs. |
| Programmable slew rate control | Configurable SW pin edge rates (3.7–7.5 V/ns ON, 1.9–4.8 V/ns OFF) balance EMI suppression against MOSFET switching losses. |
| 6-level overvoltage protection | Independent OVP thresholds configurable per application; prevents catastrophic failure during LED string open-circuit events or transient surges. |
Applications
| Tablet LCD Backlight | Industrial HMI Display |
|---|---|
Use Scenario: 10.1-inch IPS LCD panel with 6-channel edge-lit WLED array requiring uniform brightness and low-power standby. IC Role / Device Role / Timing Role: Primary LED driver IC managing boost voltage, current matching, and synchronized PWM dimming across all channels. Use Value: Adaptive dimming extends battery life by 22% at 20% brightness; phase-shifted PWM eliminates audible noise during video playback. |
Use Scenario: Ruggedized 7-inch touchscreen HMI in factory automation with wide temperature (-30°C to +85°C) and EMI requirements. IC Role / Device Role / Timing Role: Fault-tolerant backlight controller with autonomous OVP/short detection and thermal shutdown. Use Value: Six-level OVP prevents field failures from LED string degradation; DSBGA package withstands mechanical shock and thermal cycling. |
| Medical Diagnostic Tablet | Automotive Infotainment Display |
Use Scenario: Portable ultrasound tablet requiring flicker-free, high-CRI backlight with clinical-grade reliability and low EMI. IC Role / Device Role / Timing Role: Precision current sink IC delivering 0.5% matching across 6 channels for consistent color rendering. Use Value: 15-bit PWM resolution enables seamless grayscale transitions critical for medical image interpretation; spread spectrum meets CISPR-25 Class 3 limits. |
Use Scenario: 12.3-inch digital instrument cluster with dynamic brightness control tied to ambient light sensor and CAN bus commands. IC Role / Device Role / Timing Role: I²C-configurable LED driver interfacing with MCU over automotive-grade I²C bus. Use Value: I²C register access allows real-time adjustment of dimming curves and fault reporting; UVLO ensures clean startup from 12 V vehicle battery. |
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-20 package; supports 30 V max boost output; identical pinout and register map; adds enhanced ESD rating (±2000 V HBM). | Preferred for new designs requiring higher ESD robustness in manufacturing or end-use environments with static-prone handling. | Select LP8557TME-E02/NOPB when ESD immunity beyond ±1000 V is mandated; otherwise LP8556TME-E02/NOPB remains fully functional. |
| TPS61165DRVR | WQFN-16 package; single-channel 40 mA sink; no I²C interface; fixed 600 kHz switching; lacks adaptive dimming and OVP programmability. | Suitable only for simpler, lower-cost displays with fixed brightness and minimal fault monitoring requirements. | Choose TPS61165DRVR only for cost-driven, single-string applications where I²C configurability and multi-channel matching are unnecessary. |
Compared with LP8557TME-E02/NOPB, the LP8556TME-E02/NOPB offers identical functionality but lower HBM ESD rating; versus TPS61165DRVR, it provides six-channel precision control, I²C flexibility, and advanced power-saving features essential for premium tablets.
Availability
LP8556TME-E02/NOPB is available at Aetrix Electronics and suitable for tablet backlight systems, industrial HMIs, and medical diagnostic displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP8556TME-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 and embedded processing technologies, with decades of expertise in power management and display interface solutions.
The LP8556 product line was designed specifically for high-efficiency, multi-channel LED backlighting in portable consumer and industrial displays-emphasizing adaptive power control, compact packaging, and robust fault resilience.
FAQ
What is the maximum LED string voltage supported by the LP8556TME-E02/NOPB?
The LP8556TME-E02/NOPB supports a fixed boost output voltage range of 16 V to 30 V, as configured in its EPROM at manufacture. This enables driving up to nine 3.3-V WLEDs in series per channel while maintaining optimal efficiency through adaptive headroom control. The device monitors VBOOST continuously and adjusts the output only to the minimum required level.
Does the LP8556TME-E02/NOPB require external programming resistors for basic operation?
No-LP8556TME-E02/NOPB is factory-programmed with default settings including boost frequency (625 kHz), LED current (25 mA), and OVP thresholds. External resistors (RFSET, RISET) are optional and only needed if custom frequency or current values differ from EPROM defaults. All core functions operate immediately upon power-up with EN/VDDIO asserted.
Can the LP8556TME-E02/NOPB drive fewer than six LED channels?
Yes-the LP8556TME-E02/NOPB supports configurable channel count from one to six via I²C register writes or EPROM configuration. Unused LEDx pins (e.g., LED4–LED6) may be left floating with no impact on performance. Channel enable/disable is fully software-controllable and does not require hardware changes.
How does the adaptive dimming feature in the LP8556TME-E02/NOPB improve power efficiency?
Adaptive dimming dynamically reduces average LED current during low-duty-cycle PWM operation while preserving perceived brightness-achieving up to 35% lower system power at 10% brightness versus conventional PWM. This occurs because human eye response is logarithmic; LP8556TME-E02/NOPB leverages that characteristic to minimize wasted energy without sacrificing visual quality.
What thermal considerations apply to the LP8556TME-E02/NOPB in a sealed tablet enclosure?
With RθJA = 66.2°C/W in its DSBGA-20 package, the LP8556TME-E02/NOPB requires careful PCB thermal design: use ≥4 thermal vias under the die pad connected to inner ground planes, maintain ≥100 mm² copper pour on layer 2, and avoid placing heat-generating components nearby. At 85°C ambient and full 6×25 mA load, junction temperature reaches ~115°C-within the 125°C limit but leaving 10°C margin for safety.
LP8556TME-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)
LP8556TME-E02/NOPB FAQ
1.How can I place an order for LP8556TME-E02/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TME-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 LP8556TME-E02/NOPB reliable?
The price and inventory of LP8556TME-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 LP8556TME-E02/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TME-E02/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TME-E02/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TME-E02/NOPB?
LP8556TME-E02/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TME-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 LP8556TME-E02/NOPB?
For technical support, including LP8556TME-E02/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TME-E02/NOPB requirements.
6.How does Aetrix verify that LP8556TME-E02/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TME-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 LP8556TME-E02/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TME-E02/NOPB?
All LP8556TME-E02/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TME-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 LP8556TME-E02/NOPB part is unused and in its original packaging.
Return procedure for LP8556TME-E02/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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