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Texas Instruments LM2756TMX/NOPB
- Part No.:
- LM2756TMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LM2756TMX/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 20DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2756TMX/NOPB from Texas Instruments is a 20-bump DSBGA-packaged, inductorless white LED driver IC that delivers up to 180mA total output current across three independently controlled groups (Group A: up to 6 LEDs @ 30mA each; Group B: up to 3 LEDs; Group C: 1 indicator LED), features 32-step exponential dimming for Group A and 8-step linear dimming for Groups B/C, and operates from 2.7V–5.5V input for portable LCD backlighting applications.
For engineers reviewing the LM2756TMX/NOPB datasheet, LM2756TMX/NOPB pinout, LM2756TMX/NOPB application, or LM2756TMX/NOPB equivalent, this page provides verified technical context on adaptive 3/2×–1× charge pump operation, I²C-controlled brightness registers (0xA0/0xB0/0xC0), current matching (≤0.4%), hardware enable (HWEN) reset behavior, and DSBGA-20 package layout constraints - all critical for dual-display power management design.
Technical Context
The LM2756TMX/NOPB implements an adaptive CMOS charge pump with automatic gain selection (1× or 3/2×) based on real-time monitoring of VDxx headroom voltage (threshold: 150mV); gain transitions are delayed via configurable VF Monitor Delay Register (0x60) to ignore transient input dips. It uses internal current mirrors referenced to a 1.25V ISET pin voltage to achieve 0.4% typical current matching across Group A sinks.
LED brightness is controlled via I²C interface (slave address 0x36) with dedicated registers: Group A (0xA0, 32 exponential steps), Group B (0xB0, 8 linear steps), Group C (0xC0, 8 linear steps), and ramp timing (0x20) affecting only Group A. The HWEN pin provides hardware-level reset independent of I²C communication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion and USB-powered systems without external LDO. |
| Total Output Current | 180mA max - distributed across 8 current sinks (D1A–D4A, D1B, D53, D62, D1C) with per-sink limit of 30mA. |
| Dimming Resolution | Group A: 32 exponential steps (800:1 ratio); Groups B/C: 8 linear steps - enables perceptually uniform brightness control. |
| Charge Pump Efficiency | Up to 90% - achieved via adaptive 3/2×/1× gain switching and low ROUT (0.9Ω pass-mode, 2.4Ω 3/2× mode). |
| Current Matching Accuracy | 0.4% typical - ensures consistent LED brightness across multi-LED arrays without external calibration. |
| Switching Frequency | 1.0–1.6MHz - allows use of small 1µF ceramic flying capacitors (e.g., Murata GNM1M2R61C105ME18D) and minimizes EMI. |
| I²C Interface | Standard-mode compatible (up to 400kHz), slave address 0x36 - enables integration with microcontroller-based display subsystems. |
Pinout & Package
LM2756TMX/NOPB uses a 20-bump, 0.4mm pitch, 1.615mm × 2.015mm × 0.6mm thin DSBGA package (TI package code YFQ0020AAA), optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Supplies charge pump and logic; must be decoupled with ≥1µF ceramic capacitor near package. |
| VOUT | Charge Pump Output | Regulated high-side rail for LED anodes; voltage tracks VIN in 1× mode or boosts to ~4.6V in 3/2× mode. |
| C1+, C1−, C2+, C2− | Flying Capacitor Terminals | Connect external 1µF MLCCs to implement charge pump; polarity-sensitive layout required. |
| D1A–D4A, D53, D62 | Group A LED Sinks | Current-sinking outputs configurable for main display (4–6 LEDs); matched within 0.4%. |
| D1B | Group B LED Sink | Configurable for secondary display or keypad lighting (1–3 LEDs); shares ISET reference with Group A. |
| D1C | Group C Indicator Sink | Dedicated single-LED driver for status indicators; full-scale current set by same RSET. |
| ISET | Current Reference Input | Resistor (RSET) from ISET to GND sets full-scale current: ILED = 189 × (1.25V / RSET). |
| HWEN | Hardware Enable | Active-high reset: drives low to force shutdown and clear internal registers; threshold 0.58V/1.075V. |
| SCL / SDIO | I²C Interface | Standard bidirectional I²C bus (SCL clock, SDIO data); requires external pull-ups to VIO. |
| GND | Ground Reference | Two dedicated bumps (A4, D1) - must connect to low-impedance PCB ground plane for thermal and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless architecture | Eliminates magnetic components and associated EMI; enables <21mm² total solution size with 1µF capacitors. |
| True shutdown isolation | Internal disconnect of all LED sinks during shutdown - prevents leakage current from draining battery in standby. |
| Programmable auto-dimming | VF Monitor Delay Register (0x60) configures gain transition delay (60µs–6ms) to suppress false triggers from supply transients. |
| Internal soft-start | Limit inrush current during power-up - avoids input voltage droop and protects upstream regulators. |
| Wide temperature range | Specified operation from –30°C to +105°C junction temperature - suitable for automotive infotainment displays. |
Applications
| Smartphone Main Display Backlight | Secondary Display Backlight |
|---|---|
Use Scenario: Driving 6 white LEDs in parallel for primary LCD backlight in compact smartphones with tight board area constraints. IC Role / Device Role / Timing Role: Constant-current sink controller with adaptive charge pump gain selection and 32-step exponential dimming via I²C. Use Value: Delivers uniform brightness at 30mA per LED while maintaining >90% efficiency across 3.0–4.2V battery range. |
Use Scenario: Powering 3 LEDs for auxiliary display (e.g., front-facing camera UI or notification bar) in dual-screen handheld devices. IC Role / Device Role / Timing Role: Independently controlled Group B current sink with 8-step linear dimming and shared ISET reference. Use Value: Enables synchronized but distinct brightness scaling between main and secondary displays using single RSET resistor. |
| Indicator LED Lighting | Portable Media Player Backlight |
Use Scenario: Driving single status LED (e.g., charging indicator or Bluetooth activity light) requiring precise low-current control. IC Role / Device Role / Timing Role: Dedicated Group C sink (D1C) with 8-step linear dimming and hardware enable (HWEN) for instant on/off. Use Value: Provides flicker-free, stable 1–30mA indicator current without software overhead or additional drivers. |
Use Scenario: Backlighting large-format TFT LCD in portable media players where thermal dissipation and board space are critical. IC Role / Device Role / Timing Role: High-efficiency inductorless driver with thermal shutdown (160°C) and low-profile DSBGA package. Use Value: Achieves 180mA total output in <21mm² footprint while limiting junction temperature rise via 40°C/W θJA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-group LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX/NOPB | Supports 3-channel analog/PWM dimming; no exponential dimming; higher quiescent current (3.5mA vs 2.5mA). | Targeted at RGB LED control with ambient light sensor interface - less optimal for monochrome exponential backlight scaling. | Select LM3530TMX/NOPB only when ambient light feedback or PWM blending is required. |
| TPS61165DRVR | Single-output boost converter; no multi-group control; requires external inductor; 1.2MHz fixed frequency. | Designed for single-string high-voltage LED strings (>15V), not parallel low-VF configurations. | Choose TPS61165DRVR for high-VF LEDs or when inductor-based efficiency is acceptable. |
Compared with LM2756TMX/NOPB, LM3530TMX/NOPB offers ambient light integration but lacks exponential dimming and tighter current matching, while TPS61165DRVR provides higher output voltage capability at the cost of inductor size and absence of multi-group control - making LM2756TMX/NOPB uniquely suited for compact dual-display backlighting with precision current matching.
Availability
LM2756TMX/NOPB is available at Aetrix Electronics and suitable for smartphone display backlighting, portable media player illumination, and dual-panel industrial HMI systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2756TMX/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 and embedded processing technologies, with over 50 years of innovation in power management and signal chain solutions.
The LM2756TMX/NOPB belongs to TI's portable LED driver product line, engineered specifically for space-constrained, battery-powered devices requiring high-efficiency, multi-zone backlight control without inductors.
FAQ
What is the maximum number of LEDs the LM2756TMX/NOPB can drive simultaneously?
The LM2756TMX/NOPB supports up to 8 LEDs total: Group A (D1A–D4A, D53, D62) can drive 4–6 LEDs, Group B (D1B) handles 1–3 LEDs, and Group C (D1C) drives 1 indicator LED. Total output current is limited to 180mA, with no individual sink exceeding 30mA. Configuration is set via I²C registers (e.g., 53A/62A bits in General Purpose Register 0x10) to assign D53/D62 to Group A or B.
How does the LM2756TMX/NOPB select between 1× and 3/2× charge pump gain modes?
The LM2756TMX/NOPB monitors headroom voltage (VDxx = VOUT − VLED) on active LED sinks. When any active Dxx pin voltage drops to ≈150mV, it triggers a switch from 1× to 3/2× gain to maintain regulation. The gain remains in 3/2× until the next I²C write, which prompts re-evaluation. Delay before transition is configurable (60µs–6ms) via VF Monitor Delay Register (0x60).
What external components are required for basic LM2756TMX/NOPB operation?
Four 1µF ceramic flying capacitors (C1+, C1−, C2+, C2−), one 1µF input capacitor (CIN), one 1µF output capacitor (COUT), and one RSET resistor from ISET to GND. RSET value determines full-scale current: e.g., 11.8kΩ yields ~20mA per sink. No inductor is needed - the LM2756TMX/NOPB is fully inductorless.
Can the LM2756TMX/NOPB drive LEDs with different forward voltages in the same group?
No - all LEDs in a group (A, B, or C) share the same VOUT rail and current reference. Mismatched VF causes unequal current distribution and brightness variation. For mixed-VF LEDs, use separate groups or external current-setting resistors. Group A's 0.4% matching assumes identical VF and thermal conditions across its sinks.
What is the function of the HWEN pin on the LM2756TMX/NOPB?
The HWEN pin provides hardware-level reset and enable control for the LM2756TMX/NOPB. When pulled high (≥1.075V), the device operates normally; when pulled low (≤0.58V), all internal registers reset to default states and LED sinks shut down with true isolation. This allows system-level power sequencing without I²C communication.
LM2756TMX/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:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 2V ~ 4V
- Current - Output / Channel:
- 30mA
- Frequency:
- 1.3MHz
- Dimming:
- I2C
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DSBGA
LM2756TMX/NOPB FAQ
1.How can I place an order for LM2756TMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2756TMX/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 LM2756TMX/NOPB reliable?
The price and inventory of LM2756TMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2756TMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2756TMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2756TMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2756TMX/NOPB?
LM2756TMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2756TMX/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 LM2756TMX/NOPB?
For technical support, including LM2756TMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2756TMX/NOPB requirements.
6.How does Aetrix verify that LM2756TMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2756TMX/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 LM2756TMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2756TMX/NOPB?
All LM2756TMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2756TMX/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 LM2756TMX/NOPB part is unused and in its original packaging.
Return procedure for LM2756TMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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