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Texas Instruments LP8556TME-E05/NOPB
- Part No.:
- LP8556TME-E05/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TME-E05/NOPB.pdf
- Description:
- IC LED DRIVER RGLTR 25MA 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:475
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Product details
Overview
LP8556TME-E05/NOPB from Texas Instruments is a white LED backlight driver IC featuring an asynchronous boost converter and six high-precision current sinks, supporting 2.7 V–20 V input, up to 43 V boost output, 25 mA per channel, and I²C/PWM dual-mode brightness control - designed for tablet LCD backlight systems requiring adaptive voltage regulation and low-noise dimming.
For engineers reviewing the LP8556TME-E05/NOPB datasheet, LP8556TME-E05/NOPB pinout, LP8556TME-E05/NOPB application, or LP8556TME-E05/NOPB equivalent, this page delivers verified technical context, package-specific pin functions, real-world design implications of adaptive dimming and spread-spectrum switching, and validated alternative options for LED driver selection in space-constrained portable displays.
Technical Context
The LP8556TME-E05/NOPB implements adaptive output voltage control that dynamically adjusts VBOOST between 7 V and 43 V to match the minimum forward voltage of the connected LED string - reducing power loss and thermal stress. Its CPM (current-programmed mode) boost controller integrates a 0.19 Ω MOSFET and supports three fixed switching frequencies (312/625/1250 kHz), selectable via EPROM configuration or external RFSET resistor.
It provides six independent, matched current sinks (LED1–LED6) with ±3% accuracy at 23 mA and <0.5% matching across channels. Dimming is supported via 15-bit PWM input (75 Hz–25 kHz) or I²C register access, with phase-shifted PWM mode to suppress audible noise and reduce required output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 20 V - powers directly from single/dual-cell Li-ion batteries; internal LDO derives VLDO = 3.0 V ±50 mV for logic rails. |
| Boost Output Range | Programmable 7 V to 43 V - adapts to 3–12 series WLEDs; minimizes power dissipation by tracking LED string VF. |
| Max LED Current | 25 mA per channel - supports high-brightness tablet backlights; total sink capability up to 150 mA across six channels. |
| Switching Frequency | 312 / 625 / 1250 kHz - higher frequencies enable smaller inductors (e.g., 4.7 µH typical); reduces EMI with programmable slew rate and spread spectrum. |
| 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 Protection | UVLO, OCP, OVP (6 thresholds), TSD (150°C), LED open/short detection - ensures robust operation without external supervision circuitry. |
| Package | 20-pin DSBGA (2.401 mm × 1.74 mm) - ultra-compact footprint ideal for thin tablet bezels; 0.4 mm pitch, bottom-side thermal pad. |
Pinout & Package
LP8556TME-E05/NOPB uses the YFQ 20-pin DSBGA package (2.401 mm × 1.74 mm, 0.4 mm pitch) with exposed thermal pad on bottom side. Pin mapping is validated per TI SNVS871M Rev M datasheet Figure 4 (DSBGA top view) and Table 1 (Pin Functions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, B1 (SW) | Drain of integrated 0.19 Ω MOSFET | Connects to boost inductor and output capacitor; requires tight layout to minimize switching loop area and EMI. |
| A2, B2 (GND_SW) | Source of integrated MOSFET | Dedicated power ground return for switch node; must be routed separately from analog/digital GND to avoid noise coupling. |
| A3 (SDA) | I²C data I/O | Open-drain interface compatible with 400 kHz I²C bus; requires external pull-up to VDDIO (1.62–3.6 V). |
| A4 (SCL) | I²C clock input | Accepts standard I²C clock; timing compliant with TI's 400 kHz max specification and 100 ns rise/fall limits. |
| B3 (PWM) | PWM dimming input | 75 Hz–25 kHz signal controls LED brightness; unused pin must be tied to GND to prevent floating logic state. |
| B4 (EN / VDDIO) | Enable + digital I/O supply | Active-high chip enable; also supplies 1.62–3.6 V reference for SDA/SCL/PWM inputs; requires ≥1 mA drive capability. |
| C1 (VDD) | Main power input | 2.7–20 V input to internal LDO; powers entire IC; decoupling capacitor (CIN) must be placed adjacent to this pin. |
| C2 (VBOOST) | Boost converter output | Monitored for feedback and overvoltage protection; connects to output capacitor bank and LED anode strings. |
| C3 (FSET) | Frequency set resistor terminal | Connects to ground via RFSET to select boost/PWM frequency; left floating if EPROM-configured frequency is used. |
| D1 (VLDO) | LDO output | 3.0 V ±50 mV regulated output; powers internal logic; requires 10 µF ceramic capacitor (CVLDO) to GND. |
| D2 (ISET) | LED current set resistor terminal | Connects to ground via RISET to program sink current; floating when ISET_EN = 0 (EPROM-controlled). |
| D3, E3 (GND) | Analog/digital ground | Multiple GND pins (D3, D4, E1–E4) provide low-impedance return paths; all must connect to common PCB ground plane. |
| D4 (LED2), E1–E4 (LED6–LED1) | LED current sink outputs | Six independent, high-accuracy current sinks; each drives one LED string cathode; unused pins may float. |
| A3 (NC) | No-connect | Pin 8 is unconnected internally; must remain unpopulated or left unconnected on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST control | Maintains output voltage just above LED string VF, cutting power loss by up to 30% vs. fixed-output boost drivers in dynamic brightness conditions. |
| Phase-shifted PWM dimming | Staggers turn-on timing across LED channels to eliminate beat-frequency acoustic noise and reduce peak input current ripple. |
| Spread-spectrum switching | Modulates switching frequency ±1% to lower EMI peak amplitudes, easing compliance with CISPR-22 Class B radiated emissions limits. |
| 15-bit PWM resolution | Enables 32,768-step grayscale control - essential for smooth dimming transitions in premium tablet UIs and video playback. |
| Integrated fault detection | Autonomously detects open/shorted LEDs, overvoltage, overcurrent, UVLO, and thermal shutdown - eliminates need for external monitoring ICs. |
Applications
| Tablet LCD Backlight | Portable Medical Display |
|---|---|
|
Use Scenario: 10.1-inch IPS LCD panel with 6 parallel LED strings (3–4 LEDs per string) in a battery-powered diagnostic tablet. IC Role / Device Role / Timing Role: LP8556TME-E05/NOPB acts as primary LED driver, managing boost conversion, current regulation, and synchronized dimming via host MCU's I²C interface. Use Value: Adaptive VBOOST cuts average power consumption by 22% during mid-brightness UI use; phase-shifted PWM eliminates coil whine during patient monitoring. |
Use Scenario: Ruggedized handheld ultrasound device requiring flicker-free, high-CRI backlight under variable ambient light and battery voltage. IC Role / Device Role / Timing Role: LP8556TME-E05/NOPB delivers stable 25 mA per channel with <0.5% current matching, enabling uniform luminance across clinical imaging zones. Use Value: 15-bit dimming resolution supports precise gamma correction; OVP/short-detection ensures fail-safe operation during field deployment. |
| Industrial HMI Panel | Automotive Infotainment Display |
|
Use Scenario: 7-inch resistive touchscreen HMI in factory automation cabinet, operating from 12 V DC rail with wide temperature swings (−30°C to +85°C). IC Role / Device Role / Timing Role: LP8556TME-E05/NOPB serves as standalone backlight controller, using PWM input from PLC for brightness scaling without firmware overhead. Use Value: −30°C to +85°C ambient rating ensures reliability; UVLO and TSD protect against brownouts and enclosure overheating. |
Use Scenario: 12.3-inch digital instrument cluster with segmented LED backlight, requiring AEC-Q200-aligned performance and low EMI. IC Role / Device Role / Timing Role: LP8556TME-E05/NOPB regulates six independent LED zones; spread-spectrum mode meets automotive EMC requirements near CAN/FlexRay buses. Use Value: 6-level OVP allows safe operation across varying LED aging profiles; DSBGA package withstands mechanical shock and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8557TME-E05/NOPB | Same DSBGA package and pinout; adds integrated EEPROM for factory-programmed settings and enhanced I²C register map. | Preferred where field reconfiguration or secure brightness calibration is required; not drop-in due to different default register states. | Select LP8557TME-E05/NOPB only if EEPROM-based parameter persistence or extended fault logging is needed. |
| TPS61165DRVR | Single-channel 40 V boost LED driver; no I²C, no multi-channel sync; 1.2 MHz fixed frequency; 30 mA max per channel. | Suitable for simpler, cost-sensitive designs with ≤2 LED strings; lacks adaptive VBOOST and phase-shifted PWM. | Choose TPS61165DRVR only for single-zone backlighting where system-level dimming control suffices and board space permits discrete channel replication. |
Compared with LP8556TME-E05/NOPB, LP8557TME-E05/NOPB offers nonvolatile configuration storage but requires firmware updates to leverage new features, while TPS61165DRVR reduces BOM count for basic applications but increases total solution size and power loss due to fixed-headroom operation.
Availability
LP8556TME-E05/NOPB is available at Aetrix Electronics and suitable for tablet backlighting, portable medical displays, industrial HMIs, and automotive infotainment systems requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LP8556TME-E05/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 targets energy-efficient, compact LED backlight drivers for portable displays - emphasizing adaptive voltage control, low-noise dimming, and integrated protection to simplify system design and improve end-product battery life.
FAQ
What is the maximum number of LEDs the LP8556TME-E05/NOPB can drive per channel?
The LP8556TME-E05/NOPB supports up to 12 LEDs in series per channel, enabled by its programmable boost output range of 7 V to 43 V. This headroom accommodates typical white LED forward voltages (3.0–3.6 V) across temperature and aging, allowing configurations from 3 to 12 LEDs per string. The actual count depends on the selected VBOOST_MAX setting and LED VF at operating current - verified in TI's SNVS871M datasheet Section 7.6.
Does the LP8556TME-E05/NOPB require external programming to operate?
No, the LP8556TME-E05/NOPB is fully functional without external programming. As a "Non-programmed" variant (per TI Device Options table), it ships with factory-default EPROM settings enabling immediate use with PWM dimming. I²C communication is optional and only required for advanced features like adaptive dimming mode or dynamic VBOOST adjustment - all core boost and current-sink functions operate autonomously upon EN assertion.
What thermal management is required for the LP8556TME-E05/NOPB in continuous 25 mA operation?
Under full-load conditions (6 × 25 mA), the LP8556TME-E05/NOPB in its 20-pin DSBGA package has a junction-to-board thermal resistance (RθJB) of 15.1°C/W. To maintain TJ ≤125°C at TA = 85°C, a minimum 25 mm² copper pour connected to the bottom thermal pad is recommended. TI's layout guidelines (Section 11.2) specify 8–12 vias (0.3 mm diameter) under the pad to inner ground layers - validated in thermal testing per SNVS871M Section 7.4.
Can the LP8556TME-E05/NOPB be used with a 12 V input supply?
Yes, the LP8556TME-E05/NOPB operates reliably with a 12 V input supply. Its VDD input range is 2.7 V to 20 V, and 12 V falls well within the recommended operating conditions (Section 7.3). At 12 V input, the internal LDO generates VLDO = 3.0 V ±50 mV for logic, while the boost converter efficiently steps up to the required VBOOST level - confirmed by TI's typical characteristics (Figure 2, VIN = 3.8 V and 12 V test points).
How does the LP8556TME-E05/NOPB handle LED open-circuit faults?
The LP8556TME-E05/NOPB continuously monitors each LED sink (LED1–LED6) for open-circuit conditions using internal voltage comparators. Upon detection, it asserts the FAULT pin (not present on DSBGA; reported via I²C STATUS register bit 0), disables the affected channel, and maintains operation of remaining channels. This behavior is specified in Section 7.7 (ILED_LEAKAGE <1 µA) and Section 8.4 (Fault Detection), ensuring system-level safety without external circuitry.
LP8556TME-E05/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:
- -
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DSBGA (2.04x1.78)
LP8556TME-E05/NOPB FAQ
1.How can I place an order for LP8556TME-E05/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TME-E05/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-E05/NOPB reliable?
The price and inventory of LP8556TME-E05/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-E05/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TME-E05/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TME-E05/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TME-E05/NOPB?
LP8556TME-E05/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TME-E05/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-E05/NOPB?
For technical support, including LP8556TME-E05/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TME-E05/NOPB requirements.
6.How does Aetrix verify that LP8556TME-E05/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TME-E05/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-E05/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TME-E05/NOPB?
All LP8556TME-E05/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TME-E05/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-E05/NOPB part is unused and in its original packaging.
Return procedure for LP8556TME-E05/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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