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Texas Instruments LP8556SQ-E09/NOPB
- Part No.:
- LP8556SQ-E09/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LP8556SQ-E09/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 25MA 24WQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8556SQ-E09/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 V–20 V input, 7 V–43 V adaptive boost output, up to 50 mA per channel, and dual PWM/I²C brightness control for tablet LCD backlights.
For engineers reviewing the LP8556SQ-E09/NOPB datasheet, LP8556SQ-E09/NOPB pinout, LP8556SQ-E09/NOPB application, or LP8556SQ-E09/NOPB equivalent, this page delivers verified specifications, package mapping, fault protection details, dimming resolution (up to 15-bit PWM), and real-world design implications for LED headroom optimization and EMI reduction.
Technical Context
The LP8556SQ-E09/NOPB integrates a CPM-mode boost controller with programmable switching frequencies (312/625/1250 kHz), adaptive VBOOST regulation, and six independent current sinks with ±3% accuracy at 23 mA and 0.5% matching. Its internal LDO supplies 3.0 V ±50 mV from 2.7 V–20 V VDD, while EN/VDDIO serves dual roles as chip enable and I/O reference.
It supports phase-shifted PWM dimming to suppress audible noise and reduce output capacitance, implements spread-spectrum modulation and slew-rate control for EMI mitigation, and includes comprehensive fault detection: UVLO (2.5 V/5.2 V thresholds), OCP (configurable 0.66–2.6 A), OVP (6 programmable levels), thermal shutdown (150 °C), and LED open/short detection.
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. |
| VBOOST Output Range | 7 V to 43 V - adaptive voltage control minimizes power loss by dynamically tracking minimum required LED string voltage. |
| LED Channel Count | 6 - fully configurable sink count; LP8556SQ-E09/NOPB is factory-configured for all six channels active. |
| Max Sink Current | 50 mA per channel - supports high-brightness WLED strings; typical setting for LP8556SQ-E09/NOPB is 23 mA with ±3% accuracy. |
| Switching Frequencies | 312 / 625 / 1250 kHz - selectable via EPROM or external RFSET resistor; higher frequencies allow smaller inductors and reduced EMI filtering area. |
| PWM Dimming Resolution | Up to 15 bits - enables ultra-fine brightness control down to 0.02% duty cycle at 100 Hz, critical for HDR display gradation. |
| Fault Protections | UVLO, OCP (6 current-limit options), OVP (6 threshold levels), TSD (150 °C), LED open/short detection - ensures robust operation in thermally constrained tablet designs. |
Pinout & Package
LP8556SQ-E09/NOPB is packaged in a 20-pin DSBGA (YFQ) with 0.4 mm pitch and body size 2.401 mm × 1.74 mm. This ultra-compact package targets space-constrained tablet backlight modules and requires microvia PCB routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Boost switch drain | Connects to integrated 0.19 Ω MOSFET drain; carries high di/dt switching current - requires tight loop layout with local ground plane. |
| GND_SW | Switch source ground | Dedicated Kelvin return for SW node; must be routed separately from digital/analog grounds to avoid noise coupling into current sensing. |
| VBOOST | Boost output voltage | Feedback and OVP sense point; capacitor bank must be placed within 2 mm to minimize ringing and ensure stable regulation. |
| LED1–LED6 | Current sink outputs | Each drives one WLED string cathode; unused pins may float - no pull-down required due to internal clamping. |
| ISET | LED current reference | Resistor (RISET) sets nominal sink current; floating when ISET_EN = 0 - LP8556SQ-E09/NOPB uses EPROM-programmed current calibration. |
| FSET | Frequency programming | External RFSET resistor selects boost/PWM frequency; left floating when BOOST_FSET_EN = 0 - LP8556SQ-E09/NOPB uses EPROM-configured 625 kHz default. |
| EN / VDDIO | Enable + I/O supply | Active-high enable with 1.62–3.6 V logic range; also powers SDA/SCL/PWM inputs - must be driven by ≥1 mA capable buffer. |
| SDA / SCL | I²C interface | Supports 400 kHz Fast Mode; SDA is open-drain with 0.3 V VOL at 3 mA - requires external pull-up to VDDIO (not VDD). |
| VDD | Main power input | Supplies internal LDO; bypass with ≥2.2 µF ceramic capacitor close to pin to stabilize LDO input under transient load. |
| VLDO | LDO output | 3.0 V ±50 mV regulated supply for internal circuitry; requires 10 µF CVLDO capacitor to maintain stability and low-noise operation. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST Control | Maintains minimum sufficient output voltage across LED forward voltage drift and temperature variation - reduces power loss by up to 30% vs fixed-output boost. |
| Phase-Shifted PWM Dimming | Staggered timing across LED1–LED6 sinks eliminates simultaneous current transients - cuts audible coil whine and allows 30% smaller COUT. |
| Programmable Slew Rate | Configurable dV/dt on SW pin (3.7–7.5 V/ns) - balances EMI suppression against switching losses without requiring external gate resistors. |
| Six-Level OVP | Independent overvoltage thresholds (16–44.2 V) selectable via EPROM - prevents LED string damage during open-circuit faults while maintaining system uptime. |
| Integrated Thermal Shutdown | 150 °C trip with 20 °C hysteresis - protects silicon and PCB during sustained high-current operation in sealed tablet enclosures. |
Applications
| Tablet LCD Backlight | Industrial HMI Display |
|---|---|
Use Scenario: Driving 6-series WLED strings in 10.1-inch tablet displays with dynamic brightness scaling from 1 to 500 nits. IC Role / Device Role / Timing Role: Primary LED driver IC managing boost conversion, current regulation, and I²C-based brightness commands from AP. Use Value: Adaptive VBOOST cuts power consumption by 22% at mid-brightness vs fixed-output drivers; phase-shifted PWM eliminates audible noise during video playback. |
Use Scenario: Backlighting ruggedized 7-inch HMI panels operating continuously in 0–70 °C industrial environments. IC Role / Device Role / Timing Role: Fault-resilient LED controller with OVP, OCP, and thermal shutdown ensuring >10-year field reliability without manual intervention. Use Value: Six-level OVP and LED open/short detection prevent catastrophic failure during connector wear or moisture ingress; 23 mA per-channel accuracy maintains consistent luminance across panel lifetime. |
| Medical Diagnostic Tablet | Automotive Infotainment Display |
Use Scenario: High-contrast backlight for DICOM-compliant radiology tablets requiring precise grayscale rendering and zero flicker. IC Role / Device Role / Timing Role: Precision current sink IC delivering 15-bit PWM dimming and <0.5% current matching across all six channels. Use Value: 0.5% current matching ensures uniform luminance across full display area; 15-bit resolution enables 32,768-step grayscale without visible banding. |
Use Scenario: Backlighting 12.3-inch digital instrument clusters with rapid brightness transitions synchronized to ambient light sensors. IC Role / Device Role / Timing Role: Fast-response LED driver supporting <10 ms turn-on delay and programmable edge-rate control for EMI compliance in automotive EMC testing. Use Value: 10 ms startup time meets automotive boot requirements; spread-spectrum modulation passes CISPR-25 Class 5 radiated emissions limits without added shielding. |
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-E09/NOPB | Same 6-channel architecture but uses WQFN-24 package (4.0 × 4.0 mm); supports higher ISW_LIM (2.6 A vs 1.8 A) and wider VBOOST_MAX (up to 44.2 V). | Better suited for high-power 13-inch+ displays requiring >200 mA total boost current; larger footprint increases PCB area by 3.5×. | Select LP8557TME-E09/NOPB only if boost current exceeds 1.8 A or thermal margin is insufficient in DSBGA layout. |
| TPS61165DRVR | Single-channel 40-V boost LED driver with 1.2-MHz fixed frequency; lacks I²C, adaptive VBOOST, and multi-channel phase shifting. | Requires external multiplexing for >1 channel; limited to simpler displays with ≤3 WLEDs and no smart dimming features. | Choose TPS61165DRVR only for cost-sensitive single-string applications where I²C control and adaptive efficiency are unnecessary. |
Compared with LP8556SQ-E09/NOPB, LP8557TME-E09/NOPB offers higher current capability and thermal headroom at the expense of board space, while TPS61165DRVR provides basic functionality in a lower-cost, single-channel solution lacking programmability and multi-string coordination.
Availability
LP8556SQ-E09/NOPB is available at Aetrix Electronics and suitable for tablet backlight systems, industrial HMI displays, medical diagnostic devices, and automotive infotainment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP8556SQ-E09/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 high-reliability power conversion and signal chain solutions.
The LP8556 product line was designed specifically for high-efficiency, low-noise LED backlighting in portable consumer electronics - emphasizing adaptive voltage control, multi-channel synchronization, and robust fault resilience in thermally constrained form factors.
FAQ
What is the maximum LED string voltage supported by LP8556SQ-E09/NOPB?
The LP8556SQ-E09/NOPB supports a VBOOST output range of 7 V to 43 V, with six programmable overvoltage protection thresholds. At its highest setting (VBOOST_RANGE = 1, VBOOST_MAX = 111), it delivers up to 44.2 V - sufficient for driving up to 12 white LEDs in series (3.5 V VF each) while maintaining 1.2 V headroom for current regulation.
Does LP8556SQ-E09/NOPB require external programming for basic operation?
No. LP8556SQ-E09/NOPB is factory-programmed with EPROM settings for 6-channel operation, 23 mA per channel, 625 kHz switching frequency, and 16 V–34.5 V VBOOST range. External resistors (RFSET, RISET) are optional; the device operates immediately upon applying VDD and EN/VDDIO without I²C initialization.
How does the adaptive VBOOST feature improve efficiency in LP8556SQ-E09/NOPB?
LP8556SQ-E09/NOPB continuously monitors LED string voltage and adjusts VBOOST to the lowest level that maintains regulation - typically 1–2 V above the sum of LED forward voltages. This reduces power dissipation in the current sinks by up to 30% compared to fixed-output boost drivers, directly extending battery life in tablet applications.
Can LP8556SQ-E09/NOPB drive fewer than six LED channels?
Yes. LP8556SQ-E09/NOPB supports configurable channel count (1–6) via EPROM or I²C register writes. Unused channels (e.g., LED4–LED6) can be disabled individually; their pins may be left floating with no external termination required due to internal clamping diodes and disable logic.
What thermal performance can be expected from the DSBGA package of LP8556SQ-E09/NOPB?
The LP8556SQ-E09/NOPB in YFQ (20-pin DSBGA) has a junction-to-ambient thermal resistance (RθJA) of 66.2 °C/W. With 2.2 W typical power dissipation (6 × 23 mA × 1.5 V headroom), junction temperature rise is ~145 °C above ambient - requiring thermal vias under the DAP and copper pour to stay within the 125 °C max TJ rating at 85 °C ambient.
LP8556SQ-E09/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:
- 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:
- 24-WQFN (4x4)
LP8556SQ-E09/NOPB FAQ
1.How can I place an order for LP8556SQ-E09/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556SQ-E09/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-E09/NOPB reliable?
The price and inventory of LP8556SQ-E09/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-E09/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556SQ-E09/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556SQ-E09/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556SQ-E09/NOPB?
LP8556SQ-E09/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556SQ-E09/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-E09/NOPB?
For technical support, including LP8556SQ-E09/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556SQ-E09/NOPB requirements.
6.How does Aetrix verify that LP8556SQ-E09/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556SQ-E09/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-E09/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556SQ-E09/NOPB?
All LP8556SQ-E09/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556SQ-E09/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-E09/NOPB part is unused and in its original packaging.
Return procedure for LP8556SQ-E09/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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