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Texas Instruments LM2756TM/NOPB
- Part No.:
- LM2756TM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LM2756TM/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:295
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Product details
Overview
LM2756TM/NOPB from Texas Instruments is a 20-bump DSBGA-packaged, inductorless white LED driver IC supporting up to 8 LEDs across three independently controlled groups (Group A: up to 6 LEDs; Group B: up to 3; Group C: 1), with 32 exponential dimming steps for Group A, 8 linear steps for Groups B/C, and I²C-compatible digital control. It delivers up to 30 mA per channel, operates from 2.7V–5.5V input, and achieves up to 90% efficiency using adaptive 3/2× or 1× charge pump gain switching.
For engineers reviewing the LM2756TM/NOPB datasheet, LM2756TM/NOPB pinout, LM2756TM/NOPB application, or LM2756TM/NOPB equivalent, key selection considerations include its dual-display backlighting capability, precise current matching (≤0.4%), hardware enable (HWEN) reset functionality, and compact 1.615 mm × 2.015 mm footprint suitable for space-constrained portable electronics.
Technical Context
The LM2756TM/NOPB implements an adaptive CMOS charge pump with dynamically selected 3/2× or 1× gain based on real-time monitoring of VDxx headroom voltage - transitioning at ~150 mV to maintain regulation as input voltage drops. Its internal current sinks are partitioned into three independent groups, each with dedicated brightness registers (A0h, B0h, C0h) and configurable assignment of auxiliary drivers D53/D62 via the General Purpose Register (10h).
Current scaling is set externally via RSET (ISET pin voltage fixed at 1.25 V), yielding full-scale output current = 189 × (1.25 V / RSET); Group A supports exponential dimming (0.125%–100% perceived brightness), while Groups B and C use linear 8-step control (10%–100%). Ramp timing for Group A is programmable in four steps (100 µs to 100 ms) via RS1/RS0 bits in register 20h.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion and USB-powered systems without external LDO. |
| Total Output Current | Up to 180 mA - distributed across 8 current sinks (D1A–D4A, D1B, D53, D62, D1C) with flexible group assignment. |
| LED Current Accuracy | ±8% over temperature and input voltage - ensures consistent brightness across display segments. |
| Current Matching | ≤0.4% typical - minimizes visible luminance variation between parallel LEDs in same group. |
| Dimming Resolution | Group A: 32 exponential steps (800:1 dimming ratio); Groups B/C: 8 linear steps - enables perceptually uniform fade and low-light visibility. |
| Charge Pump Efficiency | Up to 90% - achieved via gain selection (1× pass mode or 3/2× boost) optimized per LED forward voltage and VIN. |
| Switching Frequency | 1.0–1.6 MHz - enables use of small 1 µF ceramic flying capacitors and reduces EMI. |
Pinout & Package
LM2756TM/NOPB uses a 20-bump, 0.4 mm pitch, thin DSBGA package (Package Number YFQ0020AAA; dimensions 1.615 mm × 2.015 mm × 0.6 mm), optimized for minimal PCB area (<21 mm² total solution size) and low profile in handheld devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Accepts 2.7–5.5 V supply; powers internal charge pump and logic; requires local 1 µF bypass capacitor. |
| VOUT | Charge Pump Output | Regulated output node (typ. 4.6 V in closed-loop mode); supplies all LED current sinks. |
| C1+, C1−, C2+, C2− | Flying Capacitor Interface | Connects to external 1 µF ceramic capacitors enabling 3/2× charge pump operation. |
| D1A–D4A, D53, D62, D1B, D1C | LED Current Sinks | Eight individually controllable constant-current outputs; D53/D62 assignable to Group A or B via register bit. |
| ISET | Current Reference Input | External resistor to GND sets full-scale current: IDxx = 189 × (1.25 V / RSET). |
| HWEN | Hardware Enable/Reset | Active-high pin; drives low to force full register reset and shutdown - no I²C required. |
| SCL / SDIO | I²C Interface | Standard two-wire interface (7-bit address 0x36); supports brightness, enable, and ramp configuration. |
| GND | Ground Reference | Two dedicated bumps (A4, D1) provide low-impedance return path for power and signal currents. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless architecture | Eliminates magnetic components and associated EMI, enabling ultra-thin designs with <21 mm² total solution size. |
| Adaptive gain switching | Automatically selects 1× (pass) or 3/2× (boost) charge pump mode based on real-time VDxx headroom, maximizing efficiency across VIN and LED VF variations. |
| True shutdown isolation | Disables all current sinks and isolates VOUT from LED anodes during shutdown - prevents leakage-induced glow in dark-mode displays. |
| Programmable auto-dimming | Configurable gain transition delay (60 µs to 6 ms) avoids spurious gain changes during brief input dips - improves system stability. |
| Internal soft-start | Limiting inrush current during power-up prevents input rail droop and protects upstream regulators and capacitors. |
Applications
| Mobile Phone Main Display Backlight | Secondary Display & Keypad Lighting |
|---|---|
Use Scenario: Driving 4–6 white LEDs in common-anode configuration for primary LCD backlight in smartphones and feature phones. IC Role / Device Role / Timing Role: Constant-current LED driver with exponential dimming and adaptive charge pump gain control. Use Value: Delivers uniform brightness across display area with ≤0.4% current matching and 32-step smooth fade transitions. |
Use Scenario: Powering 1–3 LEDs for sub-display, status indicators, or keypad illumination in dual-screen handhelds. IC Role / Device Role / Timing Role: Independently controlled Group B current sink bank with 8-step linear dimming. Use Value: Enables simultaneous main + auxiliary lighting with separate brightness profiles and no additional driver ICs. |
| Indicator LED with Hardware Reset | Large Format LCD Backlighting |
Use Scenario: Driving single indicator LED (D1C) requiring instant on/off control and fail-safe reset behavior. IC Role / Device Role / Timing Role: Dedicated Group C current sink with HWEN-driven hard reset capability. Use Value: Guarantees immediate LED disable during system fault or sleep mode via direct hardware signal - no firmware dependency. |
Use Scenario: Scaling to 8-LED configurations (e.g., 6+2) for larger portable displays such as tablets or industrial HMIs. IC Role / Device Role / Timing Role: Multi-group LED driver with configurable D53/D62 assignment to extend Group A or B capacity. Use Value: Supports flexible LED layout without redesign - D53/D62 reassigned via I²C to match mechanical LED placement. |
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; lacks exponential dimming; uses different I²C address (0x63) and register map. | Targeted at simpler dual-display systems without high-fidelity fade requirements. | Choose when linear dimming suffices and board layout allows rework for alternate pinout and control protocol. |
| TPS61165DRVR | Single-output boost LED driver with PWM-only dimming; no multi-group control or I²C interface. | Requires external logic for multi-LED sequencing; not suitable for independent group management. | Select only for cost-sensitive, single-backlight applications where software-controlled group dimming is unnecessary. |
Compared with LM3530TMX/NOPB and TPS61165DRVR, the LM2756TM/NOPB uniquely combines exponential dimming, true hardware reset, and flexible group reconfiguration - making it optimal for premium mobile UIs demanding precise luminance control and rapid system-level power management.
Availability
LM2756TM/NOPB is available at Aetrix Electronics and suitable for mobile phone backlighting, portable HMI displays, and embedded indicator lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2756TM/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 power conversion and interface solutions.
The LM2756TM/NOPB belongs to TI's white LED driver product line, engineered specifically for space-constrained portable electronics requiring high-efficiency, multi-zone backlight control with minimal external components.
FAQ
What is the maximum number of LEDs the LM2756TM/NOPB can drive simultaneously?
The LM2756TM/NOPB supports up to 8 LEDs total: Group A accommodates 4, 5, or 6 LEDs; Group B supports 1–3; and Group C (D1C) drives 1 indicator LED. Auxiliary drivers D53 and D62 are configurable to either group, enabling flexible allocation - for example, 6 LEDs in Group A plus 2 in Group B. Total output current must remain ≤180 mA.
How does the LM2756TM/NOPB achieve high current matching across LED channels?
The LM2756TM/NOPB achieves ≤0.4% typical current matching through laser-trimmed internal current mirrors and matched transistor layouts within each group. Matching is measured per group (Group A worst-case, Group B worst-case), with specification guaranteed over −30°C to +105°C junction temperature and 2.7–5.5 V input range - critical for uniform display luminance.
Can the LM2756TM/NOPB operate without an I²C controller?
Yes - the LM2756TM/NOPB can function with basic on/off control using only the HWEN pin. Default power-on state enables Group A at full brightness (32-step code 0x1F), Group B at full (0xFF), and Group C enabled. Full dimming, group reconfiguration, and ramp control require I²C communication, but core LED driving is hardware-enabled.
What external components are mandatory for LM2756TM/NOPB operation?
Mandatory components include: one 1 µF input capacitor (CIN) at VIN, one 1 µF output capacitor (COUT) at VOUT, two 1 µF flying capacitors (C1+, C1−, C2+, C2−), and one RSET resistor from ISET to GND. All capacitors must be low-ESR ceramic (e.g., Murata GNM1M2R61C105ME18D). No inductors are required.
Does the LM2756TM/NOPB support automatic gain switching during operation?
Yes - the LM2756TM/NOPB continuously monitors VDxx headroom voltage across active LED pins. When any active sink voltage falls to ~150 mV, it triggers automatic transition from 1× (pass) to 3/2× (boost) gain to maintain regulation. The gain remains locked until next I²C write, preventing oscillation during transient conditions.
LM2756TM/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
LM2756TM/NOPB FAQ
1.How can I place an order for LM2756TM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2756TM/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 LM2756TM/NOPB reliable?
The price and inventory of LM2756TM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2756TM/NOPB is usually 5 days.
3.What payment methods are accepted for LM2756TM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2756TM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2756TM/NOPB?
LM2756TM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2756TM/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 LM2756TM/NOPB?
For technical support, including LM2756TM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2756TM/NOPB requirements.
6.How does Aetrix verify that LM2756TM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2756TM/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 LM2756TM/NOPB meets industry standards.
7.What is the process for return or replacement of LM2756TM/NOPB?
All LM2756TM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2756TM/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 LM2756TM/NOPB part is unused and in its original packaging.
Return procedure for LM2756TM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2756TM/NOPB Tags
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BCR430UXTSA2
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BCR420UE6433HTMA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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