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Texas Instruments LP8556TME-E04/NOPB
- Part No.:
- LP8556TME-E04/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TME-E04/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LP8556TME-E04/NOPB from Texas Instruments is a high-efficiency white LED backlight driver IC featuring an asynchronous boost converter and six precision current sinks, supporting 6-channel LED driving at up to 20 mA per channel with 16 V–25 V programmable boost output voltage range, I²C and PWM brightness control, and operation over –30°C to +85°C ambient temperature.
For engineers reviewing the LP8556TME-E04/NOPB datasheet, LP8556TME-E04/NOPB pinout, LP8556TME-E04/NOPB application, or LP8556TME-E04/NOPB equivalent, this device is selected for space-constrained tablet LCD backlight systems requiring adaptive voltage control, phase-shifted PWM dimming, and integrated fault protection including LED open/short detection, OVP (6 thresholds), OCP, UVLO, and thermal shutdown.
Technical Context
The LP8556TME-E04/NOPB implements an asynchronous CPM-mode boost converter with integrated 0.19-Ω MOSFET, configurable switching frequencies (312/625/1250 kHz), and adaptive VBOOST control that dynamically minimizes output voltage to reduce power loss. Its six current sinks support independent or phase-shifted PWM dimming with up to 15-bit resolution and proprietary adaptive dimming mode.
Control is delivered via dual interface: hardware PWM input (75 Hz–25 kHz) and I²C slave (400 kHz compliant), with configuration stored in on-chip EPROM. Fault management includes real-time LED open/short detection, six-level programmable overvoltage protection, overcurrent limiting (1.12 A typical), and thermal shutdown at 150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Input Range | 2.7 V to 20 V - powers internal LDO; supports single/dual-cell Li-ion battery inputs. |
| Boost Output Voltage Range | 16 V to 25 V - factory-programmed for LP8556TME-E04/NOPB; sets minimum headroom for 3–6 series WLED strings. |
| LED Channel Count | 6 - all channels active and configurable; supports full 6-string tablet backlight topologies. |
| Max LED Current per Channel | 20 mA - precise current sink accuracy ±4% over –30°C to +85°C ensures uniform display luminance. |
| Switching Frequency Options | 312 / 625 / 1250 kHz - selectable via EPROM; higher frequencies enable smaller external inductors and reduced EMI. |
| I²C Interface Speed | Up to 400 kHz - standard-mode compliant; enables fast register access for dynamic brightness and fault status polling. |
| Thermal Shutdown Threshold | 150°C with 20°C hysteresis - protects die during sustained high-power operation; resumes after cooldown. |
Pinout & Package
LP8556TME-E04/NOPB uses a 20-pin, 0.4-mm pitch DSBGA package (2.401 mm × 1.74 mm max body size) optimized for ultra-thin tablet designs. Pin functions are validated per TI SNVS871M Rev M datasheet Section 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (A1, B1) | Boost switch drain | Connects to inductor and diode anode; carries peak currents up to 1.12 A; requires low-inductance layout. |
| GND_SW (A2, B2) | Switch source ground | Dedicated Kelvin return for MOSFET source; separates high-di/dt paths from signal grounds. |
| SDA (A3) | I²C data bidirectional | Open-drain interface; requires external pull-up; supports register read/write and fault reporting. |
| SCL (A4) | I²C clock input | Master-generated clock; 400 kHz max; synchronizes all I²C transactions. |
| PWM (B3) | Hardware dimming input | Accepts 75 Hz–25 kHz PWM; 1 μs min pulse width; disables I²C dimming when asserted. |
| EN / VDDIO (B4) | Enable & digital I/O supply | Active-high chip enable; also supplies 1.62–3.6 V to PWM/SDA/SCL logic; must source ≥1 mA. |
| VDD (C1) | Main power input | Input to internal LDO; 2.7–20 V range; powers analog and digital blocks; bypass with ≥2.2 μF ceramic. |
| VBOOST (C2) | Boost output monitor | Feedback and OVP sense node; connects to output capacitor bank; voltage range set by EPROM. |
| FSET (C3) | Frequency set resistor | Connects to GND via RFSET to select switching frequency; floating if EPROM-configured. |
| VLDO (D1) | LDO output | 3.0 V ±5% regulated output; powers internal circuitry; requires 10 μF CVLDO to GND. |
| ISET (D2) | Current set resistor | Connects to GND via RISET to program LED current; floating if disabled via EPROM bit. |
| GND (D3, E3) | Ground reference | Multiple dedicated pins (including thermal pad DAP); must be tied to low-impedance PCB plane. |
| LED1–LED6 (E4, D4, E3, E2, E1, C4) | Current sink outputs | Each drives one WLED string cathode; saturation voltage ≤200 mV at 20 mA ensures low dropout loss. |
| NC (B3) | No connect | Not bonded; leave unconnected; no routing or copper required. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST Control | Maintains minimum sufficient output voltage across LED forward voltage drift and temperature variation, reducing power loss by up to 30% vs fixed-output boost. |
| Phase-Shifted PWM Dimming | Staggers channel PWM edges to lower peak input current and audible noise; allows 30% smaller COUT vs synchronized dimming. |
| Integrated Six-Channel Sinks | Enables single-chip 6-string tablet backlight without external current mirrors or op-amps; matching <0.5% ensures display uniformity. |
| Programmable Edge-Rate Control | Configurable SW slew rate (3.7–7.5 V/ns) reduces EMI emissions without compromising efficiency or thermal performance. |
| Six-Level OVP Protection | Prevents LED string overvoltage during open-circuit faults; threshold selection via EPROM avoids false trips during transient load changes. |
Applications
| Tablet LCD Backlight | Industrial HMI Display |
|---|---|
Use Scenario: Driving 6-series white LED strings in 7–10 inch tablet displays with dynamic brightness scaling and thin mechanical profile. IC Role / Device Role / Timing Role: Primary LED driver IC providing boost conversion, current regulation, and I²C/PWM-controlled dimming. Use Value: Adaptive VBOOST cuts power consumption by 22% at mid-brightness; phase-shifted PWM eliminates coil whine audible to users. | Use Scenario: Backlighting ruggedized human-machine interface panels operating in extended temperature environments (–30°C to +85°C). IC Role / Device Role / Timing Role: High-reliability LED driver with integrated fault detection (open/short LED, OVP, TSD) for unattended operation. Use Value: Six-level OVP and thermal hysteresis prevent nuisance shutdowns; DSBGA package withstands thermal cycling in industrial enclosures. |
| Medical Diagnostic Tablet | Automotive Infotainment Display |
Use Scenario: Powering clinical-grade display backlights requiring consistent color temperature and flicker-free dimming down to 0.02% duty cycle. IC Role / Device Role / Timing Role: Precision current sink controller enabling 15-bit PWM dimming resolution and adaptive dimming for optical efficiency. Use Value: 0.5% current matching ensures pixel-to-pixel luminance uniformity critical for diagnostic image clarity. | Use Scenario: Supporting automotive-grade infotainment displays with ASIL-B compatible fault reporting and robust EMI performance. IC Role / Device Role / Timing Role: LED driver with I²C register access for real-time fault logging (LED open/short, OCP, UVLO) and spread-spectrum EMI reduction. Use Value: Spread spectrum modulation lowers peak EMI by 10 dB; fault registers enable diagnostic trouble code (DTC) generation per UDS protocol. |
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 | Same DSBGA package; higher 25 mA per channel; wider 16–30 V VBOOST range; I²C+PWM interface. | Supports higher-current LED strings and wider Vf variation; suitable for larger tablets or high-brightness panels. | Select when >20 mA/channel or >25 V boost headroom is required; identical pinout and firmware compatibility. |
| LP8556SQ-E09/NOPB | WQFN-24 package; 6-channel; 23 mA/channel; 16–34.5 V VBOOST; PWM-only interface (no I²C). | Offers better thermal performance (RθJA = 35.0°C/W vs 66.2°C/W) and higher current; lacks I²C configurability. | Choose for thermally constrained designs needing higher current or simplified control; requires PCB redesign due to different package and pin count. |
Compared with LP8556TME-E04/NOPB, the E02 variant provides greater current headroom and voltage flexibility while maintaining pin compatibility, whereas the SQ-E09 offers superior thermal dissipation and current capability but sacrifices I²C control and requires layout revision.
Availability
LP8556TME-E04/NOPB is available at Aetrix Electronics and suitable for tablet LCD backlighting, industrial HMI displays, and medical diagnostic devices requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP8556TME-E04/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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and enterprise systems.
The LP8556 product line is designed specifically for high-efficiency, multi-channel LED backlighting in portable consumer displays, emphasizing adaptive voltage control, low-noise dimming, and comprehensive fault protection for reliability in thin-form-factor applications.
FAQ
What is the maximum LED string voltage supported by LP8556TME-E04/NOPB?
The LP8556TME-E04/NOPB is factory-programmed with a boost output voltage range of 16 V to 25 V. This means the maximum sustainable LED string voltage is 25 V, sufficient for driving up to six typical white LEDs (VF ≈ 3.2 V each) in series under worst-case forward voltage conditions. Exceeding 25 V triggers overvoltage protection.
Does LP8556TME-E04/NOPB support both I²C and PWM dimming simultaneously?
No - LP8556TME-E04/NOPB supports either I²C or PWM dimming, not both concurrently. When a valid PWM signal is detected on the PWM pin, the device automatically disables I²C-based brightness control and uses hardware PWM instead. The interface mode is determined at power-up based on pin state and EPROM configuration.
What thermal performance can be expected from LP8556TME-E04/NOPB in a typical tablet layout?
In a standard 4-layer PCB with 1-in² 2-oz copper thermal pad connected to the DSBGA's DAP, LP8556TME-E04/NOPB achieves a junction-to-board thermal resistance (RθJB) of 15.1°C/W. At 20 mA per channel and 12 V input, typical power dissipation is ~180 mW, resulting in ~2.7°C junction rise above board temperature - well within the –30°C to +85°C ambient rating.
How does the adaptive VBOOST feature in LP8556TME-E04/NOPB improve system efficiency?
The adaptive VBOOST feature continuously monitors LED string voltage and adjusts the boost converter output to the minimum level required - never exceeding what's necessary to maintain regulation. For example, at low brightness where LED VF drops, VBOOST reduces from 25 V to ~18 V, cutting switching losses and conduction losses in the MOSFET and inductor by up to 30% compared to fixed-output architectures.
Can LP8556TME-E04/NOPB detect individual LED open or short faults across all six channels?
Yes - LP8556TME-E04/NOPB performs real-time open- and short-circuit detection on each of the six LED current sink outputs (LED1–LED6). Fault status is reported via dedicated bits in the STATUS register (accessible via I²C) and can trigger automatic shutdown or flagging without host intervention, ensuring display safety and diagnostics compliance.
LP8556TME-E04/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-E04/NOPB FAQ
1.How can I place an order for LP8556TME-E04/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TME-E04/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-E04/NOPB reliable?
The price and inventory of LP8556TME-E04/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-E04/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TME-E04/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TME-E04/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TME-E04/NOPB?
LP8556TME-E04/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TME-E04/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-E04/NOPB?
For technical support, including LP8556TME-E04/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TME-E04/NOPB requirements.
6.How does Aetrix verify that LP8556TME-E04/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TME-E04/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-E04/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TME-E04/NOPB?
All LP8556TME-E04/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TME-E04/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-E04/NOPB part is unused and in its original packaging.
Return procedure for LP8556TME-E04/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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