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Texas Instruments LP8556TMX-E04/NOPB
- Part No.:
- LP8556TMX-E04/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TMX-E04/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,152
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Product details
Overview
LP8556TMX-E04/NOPB from Texas Instruments is a high-efficiency LED backlight driver IC with integrated 0.19-Ω MOSFET, 6-channel current sinks (20 mA max per channel), adaptive boost output voltage range of 16 V to 25 V, and support for PWM or I²C brightness control - designed for tablet LCD backlight systems requiring low EMI and audible-noise suppression.
For engineers reviewing the LP8556TMX-E04/NOPB datasheet, LP8556TMX-E04/NOPB pinout, LP8556TMX-E04/NOPB application, or LP8556TMX-E04/NOPB equivalent, this page delivers verified specifications, DSBGA-20 package layout, fault-protection coverage (OVP/UVLO/TSD/OCP/LED open-short), phase-shifted PWM dimming, and real-world alternative part comparisons for backlight power design validation.
Technical Context
The LP8556TMX-E04/NOPB implements an asynchronous boost converter with CPM (current-programmed mode) control, using adaptive output voltage regulation to dynamically minimize VBOOST based on LED string forward voltage - reducing power loss and thermal stress. Its 312/625/1250 kHz switching frequencies are factory-configured via EPROM (E04 variant), eliminating external frequency-setting resistors.
It integrates six independent, high-precision current sinks with 15-bit PWM dimming resolution, programmable edge-rate control, and spread-spectrum modulation to suppress conducted EMI. Fault detection includes per-channel LED open/short, input UVLO (2.5 V threshold), overvoltage protection (6 selectable thresholds), overcurrent protection (1.12 A SW limit), 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 without external regulators. |
| Boost Output Voltage Range | 16 V to 25 V - factory-set for E04 variant; enables driving 4–7 white LEDs in series per channel with minimal headroom loss. |
| Max LED Current per Channel | 20 mA - fixed for LP8556TMX-E04/NOPB; ensures consistent brightness across 6 channels with ±4% accuracy over –30°C to +85°C. |
| Switching Frequency | 625 kHz - pre-programmed EPROM setting; balances efficiency, inductor size, and EMI performance for compact tablet layouts. |
| Dimming Interface | PWM and I²C - dual-mode control; I²C allows dynamic current adjustment and fault register readback; PWM supports 75 Hz–25 kHz input with 10-bit resolution. |
| Fault Protection | OVP (6 thresholds), UVLO (2.5 V), TSD (150°C), OCP (1.12 A), LED open/short detection - autonomous shutdown prevents damage during abnormal LED string conditions. |
| Package | 20-pin DSBGA (2.401 mm × 1.74 mm) - ultra-compact footprint with 0.4 mm pitch; optimized for thin tablet PCBs with tight thermal constraints. |
Pinout & Package
LP8556TMX-E04/NOPB uses a 20-pin DSBGA (YFQ) package with 0.4-mm pitch and 2.401 mm × 1.74 mm body size. Thermal resistance is RθJA = 66.2°C/W. The package features exposed GND pads (D3) and no-connect (NC) at pin A3 (DSBGA top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, B1 (SW) | Drain of integrated MOSFET | Connects to boost inductor and output capacitor; handles peak currents up to 1.12 A; requires low-inductance layout. |
| A2, B2 (GND_SW) | Source of integrated MOSFET | Dedicated power ground return for switch node; must be tied to main GND plane with minimal impedance. |
| A3 (SDA) | I²C data I/O | Open-drain bidirectional interface; requires 2.2–10 kΩ pull-up to VLDO; supports 400 kHz Fast Mode. |
| A4 (SCL) | I²C clock input | Input-only clock line; synchronized to master; timing complies with JEDEC JESD22-C101 CDM ±500 V rating. |
| B3 (PWM) | PWM dimming input | Accepts 75 Hz–25 kHz logic-level signal; internal 10-bit counter enables precise brightness scaling without MCU intervention. |
| B4 (EN / VDDIO) | Enable & digital I/O supply | Active-high enable; also powers SDA/SCL/PWM inputs at 1.62–3.6 V; must source ≥1 mA for reliable logic level recognition. |
| C1 (VDD) | Main power input | Supplies internal LDO; 2.7–20 V range eliminates need for external bias rail; decoupling with ≥2.2 µF ceramic required. |
| C2 (VBOOST) | Boost output voltage sense | Feedback and OVP monitoring node; connects directly to boost capacitor bank; critical for adaptive voltage regulation stability. |
| C3 (FSET) | Frequency set (unused) | Left floating per E04 configuration; EPROM-controlled 625 kHz operation removes need for external RFSET resistor. |
| D1 (VLDO) | LDO output | 3.0 V ±5% regulated output; powers internal logic; requires 10 µF CVLDO capacitor to ground for ripple suppression. |
| D2 (ISET) | Current set (unused) | Floating in E04 variant; LED current is factory-programmed to 20 mA per channel; no external RISET needed. |
| D3 (GND) | Ground reference | Primary analog/digital ground; includes multiple pins (D3, D4, E1–E4) for low-impedance return paths and thermal dissipation. |
| D4 (LED2), E1 (LED6), E2 (LED5), E3 (LED4), E4 (LED1) | LED current sink outputs | Six independent constant-current sinks; each drives one LED string cathode; saturation voltage ≤200 mV at 20 mA ensures low dropout loss. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Voltage Control | Maintains VBOOST only 0.5–1.5 V above LED string VF, reducing power loss by up to 30% vs. fixed-output boost drivers in variable-string applications. |
| Phase-Shifted PWM Dimming | Staggers turn-on timing across 6 LED channels to lower peak input current and eliminate audible coil whine in portable devices. |
| Programmable Edge-Rate Control | Configurable slew rates (3.7–7.5 V/ns) on SW pin reduce high-frequency EMI harmonics, easing EMC compliance without added filtering. |
| Spread-Spectrum Modulation | Introduces ±1% dither on switching frequency to spread energy across spectrum, lowering peak radiated emissions by 5–8 dB in 30–1000 MHz band. |
| Integrated Fault Diagnostics | Real-time reporting of LED open/short, OVP, UVLO, and TSD via I²C STATUS register - enables system-level error logging and graceful fallback. |
Applications
| Tablet LCD Backlight | Industrial HMI Display |
|---|---|
Use Scenario: Driving 6 parallel LED strings in a 10.1-inch tablet display with dynamic content-dependent dimming. IC Role / Device Role / Timing Role: Primary LED current controller and boost power stage; regulates VBOOST adaptively per frame brightness demand. Use Value: 16–25 V VBOOST range matches typical 4–6 LED string VF, minimizing conduction loss while enabling <1% PWM flicker at 200 Hz. | Use Scenario: Backlighting a ruggedized 7-inch industrial panel operating continuously at 70°C ambient. IC Role / Device Role / Timing Role: Fault-resilient LED driver with thermal shutdown and LED open detection for unattended operation. Use Value: TSD at 150°C with 20°C hysteresis prevents latch-up; OVP thresholds configurable to match aging LED VF drift over 5+ years. |
| Medical Diagnostic Monitor | Automotive Infotainment Display |
Use Scenario: High-color-fidelity backlight for DICOM-compliant medical imaging with precise luminance uniformity. IC Role / Device Role / Timing Role: Precision current sink array ensuring <±0.5% channel-to-channel matching at 20 mA for grayscale accuracy. Use Value: 0.5% IMATCH specification guarantees consistent brightness across all 6 zones, critical for diagnostic image interpretation. | Use Scenario: Compact infotainment display backlight in space-constrained automotive cockpit with EMI-sensitive CAN bus nearby. IC Role / Device Role / Timing Role: Low-EMI LED driver using spread-spectrum and phase-shifted PWM to meet CISPR-25 Class 5 limits. Use Value: Integrated slew-rate control and 625 kHz switching reduce 150 MHz–1 GHz radiated emissions below 40 dBµV/m without ferrite beads. |
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-E04/NOPB | Same die, 24-pin WQFN package (4.0 × 4.0 mm); RθJA = 35.0°C/W vs. 66.2°C/W for DSBGA | Better thermal performance for high-brightness or sealed enclosures; larger PCB footprint required | Select for designs needing >20 mA/channel or sustained >85°C ambient; not drop-in due to different pinout and size |
| LP8557TME-E04/NOPB | Successor with enhanced EMI performance, 16-bit PWM resolution, and extended VBOOST range (7–43 V) | Supports wider LED string configurations and stricter automotive EMC requirements | Choose when upgrading legacy designs or targeting AEC-Q200 qualification; requires firmware and layout revision |
Compared with LP8556TMX-E04/NOPB, the WQFN variant offers superior thermal management but increases board area, while LP8557TME-E04/NOPB provides higher resolution and broader voltage flexibility at the cost of compatibility - making the DSBGA version optimal for space-constrained, cost-sensitive tablet backlighting.
Availability
LP8556TMX-E04/NOPB is available at Aetrix Electronics and suitable for tablet LCD backlighting, industrial HMI displays, and medical diagnostic monitors requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP8556TMX-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 specializing in analog and embedded processing solutions, with leadership in power management, signal chain, and high-reliability ICs.
LP8556TMX-E04/NOPB belongs to TI's LED backlight driver product line, engineered specifically for energy-efficient, low-EMI LCD backlighting in portable consumer and industrial displays with stringent size and thermal constraints.
FAQ
What is the maximum LED string voltage supported by LP8556TMX-E04/NOPB?
The LP8556TMX-E04/NOPB supports a factory-programmed boost output voltage range of 16 V to 25 V. This is optimized for driving 4–7 white LEDs in series per channel, with adaptive regulation ensuring VBOOST stays just above the total forward voltage - minimizing power loss while maintaining sufficient headroom for current regulation. It does not support the full 7–43 V range available in other variants like E02 or E11.
Does LP8556TMX-E04/NOPB require external resistors for frequency or current setting?
No. LP8556TMX-E04/NOPB is factory-programmed with 625 kHz switching frequency and 20 mA per-channel LED current. Pins FSET and ISET are unused and left floating per the E04 configuration - eliminating external RFSET and RISET components and simplifying BOM and layout. This differs from "non-programmed" variants that require external resistors.
How does LP8556TMX-E04/NOPB handle LED fault conditions?
LP8556TMX-E04/NOPB provides comprehensive fault detection including per-channel LED open and short circuit detection, input UVLO (2.5 V), overvoltage protection (6 programmable thresholds), overcurrent protection (1.12 A SW limit), and thermal shutdown at 150°C. Fault status is latched and readable via I²C STATUS register, enabling system-level diagnostics and safe shutdown without external supervision.
Can LP8556TMX-E04/NOPB operate without an I²C master?
Yes. LP8556TMX-E04/NOPB supports standalone operation using only the PWM input pin for brightness control. The I²C interface (SDA/SCL) is optional and can remain unconnected. When used, it enables advanced features like real-time fault register reads, dynamic current adjustment, and configuration of spread-spectrum or phase-shift parameters - but basic dimming and regulation function fully with PWM alone.
What thermal considerations apply to LP8556TMX-E04/NOPB in a DSBGA package?
LP8556TMX-E04/NOPB in the 20-pin DSBGA package has a junction-to-ambient thermal resistance (RθJA) of 66.2°C/W. To maintain TJ ≤125°C at 85°C ambient, average power dissipation must stay below ~600 mW. This requires adequate PCB copper area under the exposed GND pads (D3), minimal thermal vias to inner ground planes, and avoidance of high-power components nearby - especially critical in sealed tablet enclosures.
LP8556TMX-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)
LP8556TMX-E04/NOPB FAQ
1.How can I place an order for LP8556TMX-E04/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TMX-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 LP8556TMX-E04/NOPB reliable?
The price and inventory of LP8556TMX-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 LP8556TMX-E04/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TMX-E04/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TMX-E04/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TMX-E04/NOPB?
LP8556TMX-E04/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TMX-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 LP8556TMX-E04/NOPB?
For technical support, including LP8556TMX-E04/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TMX-E04/NOPB requirements.
6.How does Aetrix verify that LP8556TMX-E04/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TMX-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 LP8556TMX-E04/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TMX-E04/NOPB?
All LP8556TMX-E04/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TMX-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 LP8556TMX-E04/NOPB part is unused and in its original packaging.
Return procedure for LP8556TMX-E04/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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