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Texas Instruments LP8556SQ-E08/NOPB
- Part No.:
- LP8556SQ-E08/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LP8556SQ-E08/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 25MA 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,102
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Product details
Overview
LP8556SQ-E08/NOPB from Texas Instruments is a high-efficiency LED backlight driver IC featuring an asynchronous boost converter and four precision current-sink channels for white LED arrays. It operates with 2.7–20 V input, delivers up to 43 V boost output, supports I²C and PWM dimming, and targets tablet LCD backlight systems requiring adaptive voltage control and low-audible-noise operation.
For engineers reviewing the LP8556SQ-E08/NOPB datasheet, LP8556SQ-E08/NOPB pinout, LP8556SQ-E08/NOPB application, or LP8556SQ-E08/NOPB equivalent, this page provides verified technical context, package mapping, channel-specific current capability (4-channel/23 mA), switching frequency options (312/625/1250 kHz), fault protection coverage (OVP, OCP, LED open/short), and validated alternative parts for backlight driver selection.
Technical Context
The LP8556SQ-E08/NOPB integrates a CPM-controlled asynchronous boost converter with programmable slew rate and spread-spectrum modulation to suppress EMI. Its adaptive VBOOST control dynamically adjusts output voltage to match LED string requirements-minimizing power loss across varying forward voltages and temperature.
This variant configures four active LED current sinks (LED1–LED4), each capable of up to 23 mA with ±4% accuracy over –30°C to +85°C ambient. It supports dual dimming interfaces: hardware PWM (75 Hz–25 kHz) and I²C (400 kHz), with phase-shifted PWM mode enabled to reduce acoustic noise and capacitor stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Input Range | 2.7 V to 20 V - powers internal LDO; supports single- or dual-cell Li-ion battery inputs. |
| VBOOST Output Range | 7 V to 43 V - digitally configurable via EPROM; enables driving 3–12 LEDs in series per channel. |
| LED Channel Count | 4 - fixed configuration for LP8556SQ-E08/NOPB; pins LED1–LED4 active; LED5–LED6 disabled. |
| Max Sink Current | 23 mA per channel - specified at TA = –30°C to +85°C; matched within ±0.5% typical. |
| Switching Frequencies | 312 / 625 / 1250 kHz - selectable via external RFSET resistor or factory-programmed EPROM. |
| Fault Protection | OVP (6 thresholds), OCP, UVLO, TSD, LED open/short detection - ensures robust operation without external supervision. |
| I²C Interface | Standard-mode (400 kHz) - supports brightness, timing, and status register access; SDA/SCL pins included. |
Pinout & Package
LP8556SQ-E08/NOPB uses the 20-pin DSBGA (YFQ) package, measuring 2.401 mm × 1.74 mm (max), with 0.4-mm pitch and bottom-side solder balls. Thermal performance: RθJA = 66.2°C/W, RθJB = 15.1°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN / VDDIO | Dual-purpose power/enable | Supplies 1.62–3.6 V to digital I/Os; must source ≥1 mA; asserts chip enable when high. |
| PWM | Digital dimming input | Accepts 75 Hz–25 kHz PWM signal; drives brightness directly; tied to GND if unused. |
| SDA, SCL | I²C interface | Open-drain bidirectional data/clock lines compliant with 400 kHz standard-mode timing. |
| LED1–LED4 | Current-sink outputs | Four active high-precision sinks (23 mA max); floating if unused; support phase-shifted PWM. |
| VBOOST | Boost converter output | Drives LED string anodes; monitored for OVP; requires local ceramic capacitor bank. |
| SW | Internal MOSFET drain | Connects to boost inductor; 0.19 Ω RDS(on); supports up to 1.8 A peak switch current (DSBGA). |
| GND_SW | MOSFET source reference | Dedicated ground return for switch node; must be routed separately from digital/analog GNDs. |
| VDD | Main power input | 2.7–20 V supply to internal LDO; powers core logic and analog blocks. |
| ISET | Current programming | Connects RISET resistor to GND; sets nominal sink current; disabled if ISET_EN = 0. |
| FSET | Frequency programming | Connects RFSET resistor to GND; selects boost/PWM frequency; floating if FSET_EN = 0. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST Control | Dynamically minimizes boost voltage to just above LED string Vf sum-reducing power loss and heat generation. |
| Phase-Shifted PWM Dimming | Staggers turn-on timing across LED channels-suppressing audible coil whine and enabling smaller output capacitors. |
| Programmable Slew Rate | Configurable SW pin edge rates (1.9–7.5 V/ns) reduce EMI emissions without sacrificing efficiency. |
| Spread-Spectrum Modulation | Introduces ±1% frequency dither on switching clock-lowering peak EMI by >10 dB in conducted/noisy bands. |
| Multi-Level OVP | Six programmable overvoltage thresholds (7–43 V range) allow precise protection matching LED string configurations. |
Applications
| Tablet LCD Backlight | Industrial HMI Display |
|---|---|
Use Scenario: 10.1-inch tablet with 4-string WLED array requiring uniform brightness and low thermal footprint. IC Role / Device Role / Timing Role: Primary LED driver IC managing boost regulation, current sinking, and I²C-based brightness scaling. Use Value: Adaptive VBOOST cuts power dissipation by ~18% vs. fixed-output drivers; phase-shifted PWM eliminates audible noise during video playback. |
Use Scenario: Ruggedized industrial panel PC operating in –30°C to +70°C ambient with EMI-sensitive sensors nearby. IC Role / Device Role / Timing Role: High-reliability backlight controller with integrated OVP/OCP and thermal shutdown for unattended operation. Use Value: Six-level OVP and LED open/short detection prevent catastrophic failure; spread-spectrum reduces conducted EMI below CISPR-22 Class B limits. |
| Medical Diagnostic Monitor | Automotive Infotainment Display |
Use Scenario: 15-inch diagnostic monitor demanding flicker-free dimming and consistent color gamut across brightness levels. IC Role / Device Role / Timing Role: Precision current sink driver supporting 15-bit PWM resolution and adaptive dimming for optical stability. Use Value: ±4% current accuracy and <0.5% matching ensure uniform luminance; adaptive dimming maintains efficacy at low brightness. |
Use Scenario: In-vehicle infotainment system with wide-input battery supply (9–16 V) and stringent automotive EMC requirements. IC Role / Device Role / Timing Role: Dual-interface (PWM + I²C) backlight controller compatible with MCU-based display management. Use Value: 2.7–20 V VDD range accommodates cold-crank transients; programmable slew rate meets ISO 11452-2 radiated immunity specs. |
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-E08/NOPB | Same 4-channel, 23 mA configuration but in 20-pin DSBGA; adds integrated EEPROM for factory-trimmed settings. | Requires no external I²C master for basic setup; better suited for cost-sensitive, fixed-function designs. | Choose LP8557TME-E08/NOPB if EEPROM-based configuration persistence and reduced firmware overhead are prioritized. |
| TPS61165DRVR | Single-channel, 40 mA sink; 2.7–6.5 V input; no I²C; fixed 1.2 MHz switching; lacks adaptive VBOOST and multi-level OVP. | Limited to simpler displays with one LED string; no phase-shift or spread-spectrum features. | Choose TPS61165DRVR only for compact, low-cost single-string applications where advanced protection and noise control are unnecessary. |
Compared with LP8556SQ-E08/NOPB, LP8557TME-E08/NOPB offers enhanced configuration retention but identical electrical performance, while TPS61165DRVR sacrifices channel count, intelligence, and noise mitigation for integration simplicity and lower BOM count.
Availability
LP8556SQ-E08/NOPB is available at Aetrix Electronics and suitable for tablet backlight systems, industrial HMIs, medical monitors, and automotive infotainment displays requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LP8556SQ-E08/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 decades of leadership in LED driver innovation and automotive-grade reliability.
The LP8556 product line was designed specifically for high-efficiency, low-noise LCD backlighting in portable and industrial displays-emphasizing adaptive voltage control, multi-level fault protection, and flexible dimming interfaces.
FAQ
What is the maximum LED string voltage supported by LP8556SQ-E08/NOPB?
The LP8556SQ-E08/NOPB supports a programmable VBOOST output range of 7 V to 43 V, enabling it to drive LED strings with total forward voltage up to 43 V. This allows configurations of 3–12 white LEDs in series per channel, depending on individual Vf and temperature conditions. The adaptive VBOOST control ensures the output is always set to the minimum sufficient level, improving efficiency.
Does LP8556SQ-E08/NOPB support both PWM and I²C dimming simultaneously?
Yes, LP8556SQ-E08/NOPB supports concurrent PWM and I²C dimming control. The PWM pin accepts external signals for direct brightness adjustment, while the I²C interface allows full register access-including brightness level, timing parameters, fault status, and configuration flags. Both interfaces can operate independently or be coordinated via host MCU firmware.
What is the LED channel configuration for LP8556SQ-E08/NOPB?
LP8556SQ-E08/NOPB is factory-configured for four active LED current-sink channels (LED1–LED4), each rated for up to 23 mA with ±4% accuracy over –30°C to +85°C. Pins LED5 and LED6 are disabled in this variant and may be left floating. This 4-channel layout matches common tablet backlight topologies with dual-edge or quad-edge LED placement.
Can LP8556SQ-E08/NOPB operate from a 12-V automotive supply?
Yes, LP8556SQ-E08/NOPB operates with a VDD input range of 2.7 V to 20 V, making it compatible with nominal 12-V automotive systems-including cold-crank scenarios down to ~6 V. Its UVLO threshold is 2.5 V (falling), and it includes robust protection features (OCP, TSD, OVP) essential for automotive-grade reliability.
What package type and thermal performance does LP8556SQ-E08/NOPB use?
LP8556SQ-E08/NOPB uses the 20-pin DSBGA (YFQ) package, sized 2.401 mm × 1.74 mm with 0.4-mm pitch. Its thermal metrics include RθJA = 66.2°C/W and RθJB = 15.1°C/W, enabling operation up to +85°C ambient. For higher-power or extended-temperature applications, the WQFN variant (e.g., LP8556SQ-E00/NOPB) offers improved RθJA = 35.0°C/W.
LP8556SQ-E08/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- 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:
- 24-WQFN (4x4)
LP8556SQ-E08/NOPB FAQ
1.How can I place an order for LP8556SQ-E08/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556SQ-E08/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 LP8556SQ-E08/NOPB reliable?
The price and inventory of LP8556SQ-E08/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8556SQ-E08/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556SQ-E08/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556SQ-E08/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556SQ-E08/NOPB?
LP8556SQ-E08/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556SQ-E08/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 LP8556SQ-E08/NOPB?
For technical support, including LP8556SQ-E08/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556SQ-E08/NOPB requirements.
6.How does Aetrix verify that LP8556SQ-E08/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556SQ-E08/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 LP8556SQ-E08/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556SQ-E08/NOPB?
All LP8556SQ-E08/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556SQ-E08/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 LP8556SQ-E08/NOPB part is unused and in its original packaging.
Return procedure for LP8556SQ-E08/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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