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Texas Instruments LM2755TM/NOPB
- Part No.:
- LM2755TM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 18-WFBGA
- Datasheet:
-
LM2755TM/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 18DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:553
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Product details
Overview
LM2755TM/NOPB from Texas Instruments is a charge-pump-based constant-current LED driver IC for trapezoidal dimming of three independent LEDs, delivering up to 30mA per channel (90mA total), operating from 2.7V–5.5V input, achieving 90% peak efficiency with no inductor required, and used in keypad and display backlighting.
For engineers reviewing the LM2755TM/NOPB datasheet, LM2755TM/NOPB pinout, LM2755TM/NOPB application, or LM2755TM/NOPB equivalent, this page delivers verified specifications, I²C-programmable timing control, DSBGA-18 package layout, trapezoidal waveform configuration, and real-world alternative part comparisons for LED driver selection.
Technical Context
The LM2755TM/NOPB integrates an adaptive 1×/3/2× charge pump with closed-loop regulation at 4.6V (typ.) and forward-voltage monitoring on all three IDx pins to dynamically select gain mode-ensuring ≥200mV headroom across each current sink while maximizing efficiency. It uses internal 20kHz PWM or externally synchronized clock (up to 1MHz) to generate programmable trapezoidal waveforms with independently adjustable rise/fall times, high/low levels, delays, and step durations.
Its I²C-compatible interface supports two chip addresses (0x18 or 0x67 via ADDR pin), eight-bit register access, and hardware reset via HWEN pin with 0.5V threshold. The device implements exponential 32-step brightness scaling (800:1 ratio) and maintains ±1% output current matching across channels under full operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 3 independent constant-current sinks (ID1–ID3), each programmable up to 30mA |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, Li-polymer, and 3.3V/5V rail operation |
| Peak Efficiency | 90% - achieved without inductor, using ceramic capacitors only (CIN/COUT/C1/C2) |
| Dimming Control | 32 exponential brightness steps (800:1 ratio) via I²C registers; trapezoidal waveform timing fully configurable |
| Charge Pump Gain | Auto-switching between 1× (pass-through) and 3/2× modes based on LED forward voltage monitoring |
| Quiescent Current | 1.3mA typical - enables low-power operation in active state; 9.5µA in shutdown |
| Package | 18-bump thin DSBGA (YFQ0018AAA), 1.8mm × 1.6mm × 0.6mm - ultra-compact footprint <13mm² solution size |
Pinout & Package
LM2755TM/NOPB is housed in an 18-bump thin DSBGA package (package code YFQ0018AAA), measuring 1.8mm × 1.6mm × 0.6mm, with bottom-side ball layout optimized for minimal PCB area and thermal performance (θJA = 56°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A3, A5 | ID1, ID2, ID3 | LED cathode current sink outputs - each regulates up to 30mA with ≥200mV headroom requirement |
| B2 | ISET | Current-setting reference pin - 1.25V (typ.) bias; RSET value determines full-scale output current (IDx = 200 × VISET/RSET) |
| B4 | HWEN | Hardware enable/reset - logic low (≤0.5V) forces internal register reset and disables all outputs |
| B6, C7 | SDIO, SCL | I²C bidirectional data and clock - referenced to VIO; supports standard-mode (100kHz) and fast-mode (400kHz) timing |
| C1 | VIN | Main power input - supplies charge pump and internal circuitry; accepts 2.7V–5.5V with ≤6.0V absolute max |
| C3, D6 | GND | Dual ground connections - provide low-impedance return path for charge pump and digital logic |
| C5 | VIO | I²C bus voltage reference - sets logic thresholds for SDIO/SCL; must be ≥1.44V and ≤VIN |
| D2 | POUT | Regulated charge pump output - delivers up to 4.6V (closed-loop) or VIN (1× mode) to LED anodes |
| D4, E1, E3, E5 | C2−, C1+, C2+, C1− | Flying capacitor terminals - connect external 0.47µF (C1/C2) ceramic caps for 3/2× charge pump operation |
| E7 | ADDR | I²C address select - high = 0x67, low = 0x18; enables dual-device addressing on same bus |
| A7 | SYNC | External clock input - accepts up to 1MHz signal to synchronize PWM and timing steps (divided by 32) |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Reduces BOM cost and board space by eliminating magnetic components; relies solely on four 0402/0603 MLCCs |
| Programmable trapezoidal dimming | Enables precise visual effects (e.g., soft-on/off, breathing, pulsing) via independent rise/fall/high/low time registers |
| Adaptive gain switching | Maintains LED current regulation across input voltage drop by monitoring VDx and triggering 3/2× mode at ~350mV |
| Exponential brightness scaling | 32-step curve matches human eye sensitivity - avoids perceptible "jumpiness" during low-level dimming transitions |
| Hardware reset pin (HWEN) | Allows system-level power sequencing or fault recovery without I²C transaction - critical for robust embedded designs |
Applications
| Keypad LED Backlight | Display LED Backlight |
|---|---|
Use Scenario: Illuminating alphanumeric keypads in portable medical devices and industrial HMIs where uniform low-current lighting is required. IC Role / Device Role / Timing Role: Constant-current sink controlling three parallel LED strings; trapezoidal dimming enables smooth fade-in/out for user feedback. Use Value: Eliminates flicker and audible noise vs. inductor-based drivers; 90% efficiency extends battery life in handheld units. |
Use Scenario: Driving edge-lit monochrome LCD displays in automotive instrument clusters and POS terminals. IC Role / Device Role / Timing Role: Regulates current to three discrete LED zones; I²C interface allows dynamic brightness adjustment based on ambient light sensor input. Use Value: Adaptive 1×/3/2× gain ensures stable illumination across wide VIN range (e.g., 12V supply with LDO dropout). |
| Indicator LEDs | Fun-light LEDs |
Use Scenario: Status indication in consumer electronics (e.g., charging, Bluetooth pairing, power-on) requiring multi-color or blinking patterns. IC Role / Device Role / Timing Role: Independent channel control enables simultaneous red/green/blue blinking with unique timing profiles per pin. Use Value: Hardware-enforced timing eliminates MCU overhead; exponential dimming prevents visible stepping at low intensities. |
Use Scenario: Decorative lighting in toys, wearables, and interactive gadgets where animated LED effects enhance user engagement. IC Role / Device Role / Timing Role: Generates trapezoidal waveforms (e.g., slow ramp-up/fast ramp-down) directly from register settings - no external timer needed. Use Value: Reduces firmware complexity and flash memory usage; tiny DSBGA package fits inside compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61160DRVR | Boost converter topology; fixed 1.2MHz switching frequency; no trapezoidal dimming or SYNC pin | Requires inductor; supports higher output voltage (up to 28V); better suited for high-Vf white LEDs | Choose TPS61160DRVR when driving >4V LEDs or needing >100mA per channel; avoid if trapezoidal waveform or inductor-free design is mandatory |
| MAX16823ATP+ | Linear LED driver with analog/digital dimming; no charge pump; thermal foldback protection | Limited to lower input-output differential; higher power dissipation; no I²C register programming | Prefer MAX16823ATP+ for ultra-low-noise applications or where precise analog current control outweighs efficiency concerns |
Compared with LM2755TM/NOPB, TPS61160DRVR offers higher output voltage capability but adds inductor cost and complexity, while MAX16823ATP+ provides simpler analog control but sacrifices programmability and efficiency - making LM2755TM/NOPB optimal for compact, inductor-free, multi-waveform LED systems.
Availability
LM2755TM/NOPB is available at Aetrix Electronics and suitable for keypad backlighting, display backlighting, indicator lighting, and fun-light LED applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2755TM/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 decades of expertise in precision analog IC design and high-volume manufacturing.
The LM2755TM/NOPB belongs to TI's LED driver product line, engineered specifically for ultra-compact, high-efficiency, programmable backlight and indicator solutions in space-constrained portable and industrial electronics.
FAQ
What is the maximum total output current supported by the LM2755TM/NOPB?
The LM2755TM/NOPB supports a maximum total output current of 90mA, distributed across its three independent current sinks (ID1–ID3), with each channel limited to 30mA maximum. This limit ensures proper thermal management and current regulation under worst-case conditions, including minimum input voltage (2.7V) and highest LED forward voltage (3.6V). Exceeding 30mA per channel risks compromising headroom voltage and regulation accuracy.
How does the LM2755TM/NOPB achieve inductor-free operation?
The LM2755TM/NOPB achieves inductor-free operation using a switched-capacitor charge pump architecture with selectable 1× and 3/2× gain modes. It employs four external ceramic capacitors (CIN, COUT, C1, C2) - typically 1µF and 0.47µF - to generate regulated output voltage at POUT. The internal control loop monitors LED forward voltage via IDx pins and automatically switches gain to maintain ≥200mV headroom across each current sink, enabling high efficiency (90% peak) without magnetic components.
Can the LM2755TM/NOPB drive LEDs with forward voltages above 4.6V?
No - the LM2755TM/NOPB cannot reliably drive LEDs with forward voltages above 4.6V. Its regulated charge pump output (POUT) is capped at 4.6V (typ.) in closed-loop 3/2× mode, and drops to VIN in 1× mode. With typical headroom requirement of 200mV per channel, the maximum supported Vf is ~4.4V at full load. For higher-Vf LEDs, a boost converter like TPS61160DRVR is recommended instead of LM2755TM/NOPB.
What is the function of the ADDR pin on the LM2755TM/NOPB?
The ADDR pin on the LM2755TM/NOPB selects between two I²C device addresses: tying ADDR high sets the address to 0x67, while tying it low sets the address to 0x18. This allows two LM2755TM/NOPB devices to coexist on the same I²C bus without address conflict, enabling multi-zone LED control in systems such as segmented displays or multi-keypad interfaces - a feature not available on single-address alternatives like MAX16823ATP+.
Does the LM2755TM/NOPB support external clock synchronization, and what is its maximum frequency?
Yes, the LM2755TM/NOPB supports external clock synchronization via the SYNC pin. When bit 6 of the General Purpose register is set, the internal timing generator locks to the external clock, dividing it by 32 to derive PWM frequency and step timing. The maximum supported SYNC frequency is 1MHz, yielding a 31.25kHz PWM frequency and 32µs minimum step time - enabling precise, jitter-free dimming waveforms synchronized to system clocks or audio signals.
LM2755TM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 18-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 30mA
- Frequency:
- 1.25MHz
- Dimming:
- I2C
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-DSBGA
LM2755TM/NOPB FAQ
1.How can I place an order for LM2755TM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2755TM/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 LM2755TM/NOPB reliable?
The price and inventory of LM2755TM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2755TM/NOPB is usually 5 days.
3.What payment methods are accepted for LM2755TM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2755TM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2755TM/NOPB?
LM2755TM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2755TM/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 LM2755TM/NOPB?
For technical support, including LM2755TM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2755TM/NOPB requirements.
6.How does Aetrix verify that LM2755TM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2755TM/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 LM2755TM/NOPB meets industry standards.
7.What is the process for return or replacement of LM2755TM/NOPB?
All LM2755TM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2755TM/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 LM2755TM/NOPB part is unused and in its original packaging.
Return procedure for LM2755TM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2755TM/NOPB Tags
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