My Inquiry
My Account
Texas Instruments LP8556TMX-E09/NOPB
- Part No.:
- LP8556TMX-E09/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LP8556TMX-E09/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,228
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP8556TMX-E09/NOPB from Texas Instruments is a high-efficiency LED backlight driver IC featuring an integrated asynchronous boost converter and six precision current sinks for tablet LCD applications. It supports 2.7 V–20 V input, delivers up to 43 V boost output, provides 23 mA per channel across all six channels, and enables dual-mode brightness control via PWM or I²C interface.
For engineers reviewing the LP8556TMX-E09/NOPB datasheet, LP8556TMX-E09/NOPB pinout, LP8556TMX-E09/NOPB application, or LP8556TMX-E09/NOPB equivalent, this device is selected for space-constrained tablet backlight designs requiring adaptive voltage control, phase-shifted PWM dimming, and robust fault protection including LED open/short detection, OVP (6 thresholds), OCP, UVLO, and thermal shutdown.
Technical Context
The LP8556TMX-E09/NOPB implements adaptive output voltage control to dynamically minimize VBOOST-reducing power loss while supporting 3–12 WLEDs in series per channel. Its CPM (current-programmed mode) boost controller operates at 312 kHz, 625 kHz, or 1250 kHz, with programmable slew rate and spread-spectrum modulation to suppress EMI.
All six current sinks are independently configurable with 15-bit PWM dimming resolution and proprietary adaptive dimming. Phase-shifted PWM timing across channels reduces audible noise and allows smaller output capacitors. Fault detection includes per-channel LED open/short reporting via I²C status register and dedicated hardware flags.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 20 V - powers directly from multi-cell Li-ion battery or regulated rail; internal LDO accepts down to 2.7 V. |
| Boost Output Voltage Range | 16 V to 34.5 V - factory-configured for LP8556TMX-E09/NOPB; enables driving up to 10–12 white LEDs in series per channel. |
| Max LED Current per Channel | 23 mA - confirmed for all six channels; matches E09 variant specification in Device Options table. |
| Switching Frequency Options | 312 kHz / 625 kHz / 1250 kHz - selectable via EPROM or external RFSET resistor; higher frequencies reduce inductor size. |
| I²C Interface Speed | Up to 400 kHz - standard-mode I²C compliant; supports brightness, configuration, and fault register access. |
| Thermal Shutdown Threshold | 150 °C - protects against sustained overload; 20 °C hysteresis ensures stable recovery. |
| Operating Ambient Temperature | –30 °C to +85 °C - qualified for consumer tablet environments; junction limit is 125 °C. |
Pinout & Package
LP8556TMX-E09/NOPB is packaged in a 20-pin, 0.4-mm pitch DSBGA (YFQ) package measuring 2.401 mm × 1.74 mm (max). The package uses bottom-side ball layout with exposed thermal pad (DAP) connected to GND for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Boost switch drain | Connects to inductor and diode anode; carries peak switching current up to 1.8 A (DSBGA-limited). |
| GND_SW | Switch source ground | Dedicated low-inductance return path for MOSFET source; must be routed separately from digital GND. |
| VDD | Main supply input | 2.7–20 V input to internal LDO; powers entire IC except SW stage; decoupling capacitor required. |
| VBOOST | Boost output node | Monitored for feedback and overvoltage protection; connects to output capacitor bank and LED string anodes. |
| LED1–LED6 | Current sink outputs | High-precision, matched sinks (±1% typical accuracy); each drives one LED string cathode to GND. |
| EN / VDDIO | Enable & I/O reference | Active-high enable; also supplies 1.62–3.6 V reference for PWM, SDA, SCL inputs; requires ≥1 mA drive capability. |
| SCL / SDA | I²C interface | Standard-mode (400 kHz) bidirectional bus; SDA is open-drain; both require pull-up resistors to VDDIO. |
| PWM | Digital dimming input | Accepts 75 Hz–25 kHz PWM signal; controls brightness when I²C master is absent; must tie to GND if unused. |
| FSET | Frequency set | Connects external RFSET resistor to configure boost/PWM frequency; floating if EPROM-configured. |
| ISET | Current set | Connects RISET resistor to GND to define full-scale LED current; floating if current programmed via I²C. |
| VLDO | LDO output | 3.0 V ±50 mV regulated output; powers internal logic; requires CVLDO capacitor (10 µF typical). |
| GND | Ground reference | Multiple GND pins (including DAP) provide low-impedance return; critical for EMI and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST Control | Maintains minimum sufficient output voltage across LED forward voltage variation and temperature drift-reducing power loss by up to 30% vs fixed-output boost. |
| Phase-Shifted PWM Dimming | Staggers PWM on-time across LED1–LED6 channels to eliminate beat-frequency audible noise and allow 30% smaller COUT. |
| 6-Threshold Programmable OVP | Configurable overvoltage trip points (e.g., 19 V, 24 V, 28 V, 32 V, 37 V, 43 V) prevent damage during LED string failure or open-circuit conditions. |
| Integrated 0.19-Ω Power MOSFET | Eliminates external high-side switch; enables >90% peak efficiency at 12 V input / 24 V output / 23 mA × 6 channels. |
| 15-Bit PWM Dimming Resolution | Enables smooth, flicker-free brightness control from 0.003% to 100% duty cycle-critical for HDR tablet displays. |
Applications
| Tablet LCD Backlight | Industrial HMI Display |
|---|---|
|
Use Scenario: 10.1-inch IPS LCD panel with 6 parallel LED strings in a thin-profile tablet design. IC Role / Device Role / Timing Role: Primary LED driver IC managing boost regulation, per-string current matching, and synchronized PWM dimming. Use Value: Adaptive VBOOST cuts power dissipation by 22% versus fixed 36 V output; phase-shifted PWM eliminates coil whine at 200 Hz dimming. |
Use Scenario: Ruggedized 7-inch industrial display operating in –25°C to +70°C ambient with variable input voltage. IC Role / Device Role / Timing Role: Robust backlight controller with extended temperature range, UVLO hysteresis, and thermal shutdown for unattended operation. Use Value: 6-level OVP prevents catastrophic failure during LED string degradation; –30°C to +85°C qualification ensures reliability in wide-temperature enclosures. |
| Medical Diagnostic Tablet | Automotive Infotainment Display |
|
Use Scenario: High-brightness diagnostic tablet requiring precise luminance uniformity and zero flicker across clinical imaging modes. IC Role / Device Role / Timing Role: Precision current sink driver with <0.5% channel-to-channel matching and 15-bit dimming resolution. Use Value: 0.5% IMATCH ensures consistent brightness across all six LED strings; adaptive dimming maintains color point stability under varying load. |
Use Scenario: In-vehicle infotainment display powered from 9–16 V automotive battery with EMI-sensitive RF modules nearby. IC Role / Device Role / Timing Role: Low-EMI backlight driver using spread-spectrum clocking and programmable slew rate control. Use Value: Spread-spectrum modulation reduces peak EMI by 12 dB at 150 MHz; slew rate control limits dv/dt to 7.5 V/ns for cleaner switching edges. |
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 DSBGA-20 package, identical pinout, but adds analog dimming support and 200-mA boost switch current rating. | Supports higher-power LED strings (up to 30 mA/channel) and analog+PWM hybrid dimming; requires different ISET configuration. | Select LP8557TME-E09/NOPB only if analog dimming or >23 mA/channel is required; otherwise LP8556TMX-E09/NOPB offers lower cost and same footprint. |
| TPS61165DRVR | Single-channel 40-V boost LED driver with 1.2-MHz fixed frequency; no I²C, no multi-channel sync, no adaptive VBOOST. | Requires external current sinks for multi-string use; lacks phase-shift, OVP threshold selection, and thermal fault reporting. | Use TPS61165DRVR only for simple single-string designs where cost and BOM count outweigh advanced features; not drop-in compatible. |
Compared with LP8557TME-E09/NOPB, LP8556TMX-E09/NOPB trades analog dimming and higher switch current for lower system cost and proven stability in volume tablet production. Against TPS61165DRVR, it delivers integrated 6-channel control, adaptive efficiency optimization, and comprehensive fault diagnostics-reducing total solution size by 37% and enabling faster time-to-market for multi-string displays.
Availability
LP8556TMX-E09/NOPB is available at Aetrix Electronics and suitable for tablet backlight systems, industrial HMI displays, and medical diagnostic devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP8556TMX-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 energy-efficient power conversion and precision analog solutions.
The LP8556 product line was designed specifically for high-efficiency, multi-string LED backlighting in portable consumer displays-emphasizing adaptive voltage control, ultra-low EMI, and robust fault coverage for mass-produced tablets and notebooks.
FAQ
What is the maximum LED string voltage supported by LP8556TMX-E09/NOPB?
The LP8556TMX-E09/NOPB is factory-configured with a boost output voltage range of 16 V to 34.5 V, as specified in the Device Options table. This supports up to 10–12 white LEDs in series per channel (assuming typical 3.0–3.4 V VF per LED at 23 mA), with headroom for temperature drift and forward voltage variation. The absolute maximum VBOOST rating is 48 V per Absolute Maximum Ratings.
Does LP8556TMX-E09/NOPB support I²C communication out of the box?
Yes, LP8556TMX-E09/NOPB supports standard-mode I²C (up to 400 kHz) without external configuration. Its SDA and SCL pins are fully compliant, with internal pull-downs disabled and logic thresholds referenced to EN/VDDIO. The device responds to its default I²C address (0x2C or 0x2D depending on ADDR pin state) and provides full register access for brightness, fault status, and configuration control.
How does the adaptive VBOOST feature improve efficiency in LP8556TMX-E09/NOPB?
LP8556TMX-E09/NOPB continuously monitors LED string voltage and dynamically adjusts VBOOST to the lowest level sufficient to maintain regulation-typically 0.5–1.5 V above the highest LED string VF. This reduces power loss in the current sinks and boost diode, improving system efficiency by up to 30% compared to fixed-output boost drivers, especially at partial brightness or low-temperature operation.
Can LP8556TMX-E09/NOPB drive fewer than six LED strings?
Yes, LP8556TMX-E09/NOPB supports configurable channel count from 1 to 6 via I²C register CFG1. Unused channels (e.g., LED4–LED6) can be disabled individually; their pins may be left floating with no impact on performance. Channel disablement reduces quiescent current and improves thermal margin in partial-string configurations.
What thermal management provisions exist for LP8556TMX-E09/NOPB in DSBGA package?
LP8556TMX-E09/NOPB in 20-pin DSBGA (YFQ) features an exposed thermal pad (DAP) connected internally to GND. TI specifies RθJB = 15.1 °C/W and RθJA = 66.2 °C/W. For reliable operation at full load, PCB design must include ≥6 thermal vias under the DAP connected to a solid GND plane, plus adequate copper area to dissipate up to 1.2 W under worst-case conditions.
LP8556TMX-E09/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-E09/NOPB FAQ
1.How can I place an order for LP8556TMX-E09/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556TMX-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 LP8556TMX-E09/NOPB reliable?
The price and inventory of LP8556TMX-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 LP8556TMX-E09/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556TMX-E09/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556TMX-E09/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556TMX-E09/NOPB?
LP8556TMX-E09/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556TMX-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 LP8556TMX-E09/NOPB?
For technical support, including LP8556TMX-E09/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556TMX-E09/NOPB requirements.
6.How does Aetrix verify that LP8556TMX-E09/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556TMX-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 LP8556TMX-E09/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556TMX-E09/NOPB?
All LP8556TMX-E09/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556TMX-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 LP8556TMX-E09/NOPB part is unused and in its original packaging.
Return procedure for LP8556TMX-E09/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8556TMX-E09/NOPB Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
