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Texas Instruments LM2759SD/NOPB
- Part No.:
- LM2759SD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM2759SD/NOPB.pdf
- Description:
- IC LED DRVR RGLTR I2C 1A 12WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2759SD/NOPB from Texas Instruments is a 1A switched-capacitor flash LED driver IC with I²C-compatible interface, adaptive 1x/1.5x/2x charge pump gain selection, and integrated current sink for camera flash applications. It operates from 2.7V–5.5V input, delivers up to 1A Flash current or 180mA Torch current, and requires only four 0603 ceramic capacitors for full operation.
For engineers reviewing the LM2759SD/NOPB datasheet, LM2759SD/NOPB pinout, LM2759SD/NOPB application, or LM2759SD/NOPB equivalent, key selection criteria include programmable Flash/Torch current via I²C (address 0x53), TX-pin RF synchronization, Strobe-triggered flash enable, Flash timeout protection (60–1100 ms), and thermal shutdown at 150°C.
Technical Context
The LM2759SD/NOPB implements an adaptive CMOS charge pump architecture that dynamically selects 1x, 1.5x, or 2x gain based on real-time headroom voltage (VGDX) at the ISINK node-transitioning when VGDX falls below 350 mV. Its closed-loop regulation maintains constant LED current across varying forward voltages (2.0V–4.0V) and input supply (2.7V–5.5V).
Control is implemented via a 7-bit I²C slave address (0x53), supporting Flash/Torch/Indicator/Shutdown modes through register 0x10, current programming via registers 0xB0 (Flash) and 0xA0 (Torch), and timeout duration via register 0xC0. Asynchronous logic pins (Strobe, TX) provide hardware-level override without I²C interaction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 1A Flash mode (register 0xB0 = 0x0F); 180mA Torch mode (register 0xA0 = 0x0F) |
| Input Voltage Range | 2.7V–5.5V - supports single-cell Li-ion battery operation with no external LDO required |
| Charge Pump Gains | Adaptive 1x (VOUT ≈ VIN), 1.5x (VOUT = 4.7V), 2x (VOUT = 5.1V) - selected automatically to minimize power loss |
| Switching Frequency | 1MHz ±30% - fixed-frequency operation enables predictable EMI filtering and small capacitor sizing |
| I²C Interface | 7-bit address 0x53, 100kHz/400kHz compatible - allows full configuration without additional GPIOs |
| Thermal Protection | Junction shutdown at 150°C (typ.), recovery at 120°C (typ.) - prevents permanent damage during sustained high-current operation |
| Package Thermal Resistance | θJA = 36.7°C/W - requires minimal PCB copper area for thermal management in compact mobile designs |
Pinout & Package
LM2759SD/NOPB is housed in a thermally enhanced 12-pin WSON package (3mm × 3mm × 0.8mm, Package Number DQB0012A) with exposed die-attach pad connected to GND for improved heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 C2− | Flying capacitor negative terminal | Completes 1.5x/2x charge pump stage; must be connected to C2− capacitor with low-inductance trace |
| 2 C2+ | Flying capacitor positive terminal | Connects to C2+ capacitor; critical path for charge transfer efficiency and EMI control |
| 3 VOUT | Regulated charge pump output | Drives LED anode; voltage depends on gain mode (4.7V/4.9V/5.1V) and load conditions |
| 4 GND | Power and signal reference ground | Must be tied directly to exposed die-attach pad; forms low-impedance return for high-pulse currents |
| 5 TX | RF PA pulse interrupt input | When high, forces LED current to Torch level - prevents battery sag during simultaneous RF transmit and flash |
| 6 ISINK | Current sink feedback node | LED cathode connection point; VGDX voltage here triggers gain transitions and enables current regulation |
| 7 Strobe | Hardware flash enable input | Pull-high to initiate Flash mode for duration of pulse or until Flash timeout expires - bypasses I²C latency |
| 8 SDA | I²C data line | Open-drain bidirectional interface; requires external pull-up to VIO (2.7V–5.5V) |
| 9 SCL | I²C clock line | Master-generated clock; timing compliant with standard-mode (100kHz) and fast-mode (400kHz) I²C |
| 10 VIN | Main power input | Supplies all internal circuitry and charge pump; accepts 2.7V–5.5V with 6.0V absolute max rating |
| 11 C1+ | Flying capacitor positive terminal | Second flying capacitor node; used in 1x/1.5x/2x topology depending on internal switch configuration |
| 12 C1− | Flying capacitor negative terminal | Paired with C1+; forms dual flying capacitor network enabling high-efficiency charge recycling |
Key Features
| Feature | Design Value |
|---|---|
| No inductor required | Reduces BOM count and board area by eliminating magnetic components - total solution area <22 mm² |
| Adaptive gain selection | Minimizes input current draw by selecting lowest viable gain (1x/1.5x/2x) based on real-time LED voltage and current demand |
| Programmable Flash timeout | Prevents thermal runaway via hardware- or software-configurable timeout (60–1100 ms) - disables current sink after expiry |
| TX pin RF synchronization | Automatically throttles LED current to Torch level during RF PA pulses - avoids battery voltage collapse and system reset |
| Soft-start circuitry | Controls reference turn-on rate to limit inrush current at enable - eliminates input rail droop and reduces stress on input capacitors |
Applications
| Smartphone Camera Flash | Tablet Integrated Flash |
|---|---|
Use Scenario: High-intensity flash illumination for low-light photography in compact handheld devices with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Constant-current switched-capacitor driver delivering up to 1A peak current to white LED array; gain adapts dynamically as LED VF changes with temperature and aging. Use Value: Enables bright, consistent flash without inductor size penalty - achieves <22 mm² solution area and <1 mm height in 3×3 mm WSON package. | Use Scenario: Dual-LED flash module in mid-size tablets requiring synchronized strobe timing and RF interference mitigation. IC Role / Device Role / Timing Role: I²C-programmable flash driver with hardware Strobe and TX inputs; coordinates flash activation with camera shutter and pauses illumination during LTE/WiFi transmission bursts. Use Value: Eliminates need for discrete logic or microcontroller intervention - TX pin reduces LED current to Torch level within microseconds of RF PA activation. |
| Wearable Imaging Module | Industrial Barcode Scanner |
Use Scenario: Miniaturized imaging subsystem in AR glasses or body-worn cameras where height and thermal envelope are constrained. IC Role / Device Role / Timing Role: Low-profile flash driver operating from 3.3V or 3.6V supply; uses 0603 MLCCs (CIN/C1/C2 = 2.2 µF, COUT = 4.7 µF) to meet <1 mm Z-height requirement. Use Value: Delivers 1A flash current in 3×3×0.8 mm WSON package with θJA = 36.7°C/W - enables passive cooling even under repeated burst operation. | Use Scenario: Rugged handheld scanner requiring reliable flash illumination in variable ambient temperatures (-30°C to +85°C). IC Role / Device Role / Timing Role: Flash controller with thermal shutdown (150°C) and wide junction temp range (-30°C to +125°C); supports programmable Torch mode for continuous aiming assist. Use Value: Maintains stable current accuracy (±10% in Flash mode) across industrial temperature range - ensures consistent barcode read performance regardless of enclosure heating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530SD/NOPB | Linear LED driver (no charge pump); max 30mA per channel, 6-channel; I²C programmable brightness/timing | Designed for display backlight dimming, not high-current flash - lacks Strobe/TX pins and >100mA capability | Select LM3530SD/NOPB only for multi-zone ambient light control or low-power indicator use - not a functional substitute for flash current delivery. |
| TPS61310DSKR | Inductor-based boost converter; 1.2A switch current; no integrated current sink; requires external sense resistor and MOSFET | Higher efficiency at low input voltages (<3.0V); but larger solution size, higher EMI, and no native Flash/Torch mode sequencing | Choose TPS61310DSKR when input voltage drops below 2.7V or when >1A sustained current is needed - accept added layout complexity and missing I²C flash control features. |
Compared with LM3530SD/NOPB and TPS61310DSKR, LM2759SD/NOPB uniquely integrates adaptive charge pump gain, hardware Strobe/TX control, and 1A current sink in a 3×3 mm WSON package - making it the only option that satisfies smartphone-grade flash requirements without external power-stage components.
Availability
LM2759SD/NOPB is available at Aetrix Electronics and suitable for smartphone camera modules, tablet imaging subsystems, wearable flash illumination, and industrial barcode scanners requiring stable component supply and long-term production continuity.
Supply support for LM2759SD/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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies for industrial, automotive, and consumer markets.
The LM2759SD/NOPB belongs to TI's portable lighting power management product line, engineered specifically for high-current, space-constrained camera flash applications in battery-powered mobile devices.
FAQ
What is the maximum LED forward voltage supported by the LM2759SD/NOPB in 2x gain mode?
The LM2759SD/NOPB regulates VOUT to 5.1V (typ.) in 2x mode. With typical current-sink headroom (VGDX) of 350 mV at 1A, the maximum supported LED forward voltage is approximately 4.75V. This assumes ROUT = 2.25Ω and accounts for voltage drop across the internal current sink - verified in Electrical Characteristics Table (VOUT = 5.1V min, VGDX = 350 mV typ. at ILED = 500mA).
How does the TX pin affect LED current regulation in the LM2759SD/NOPB?
When the TX pin is driven high, the LM2759SD/NOPB forces LED current to the programmed Torch level regardless of Flash mode setting - reducing battery load during RF PA transmission. This occurs without I²C interaction and is active only while TX remains high; current resumes full Flash level when TX returns low. The behavior is confirmed in Logic Control Pins table (page 9) and Application Information section.
Can the LM2759SD/NOPB operate without I²C configuration?
Yes - the LM2759SD/NOPB powers up in Shutdown mode (General Purpose Register x10 = 0x00) and requires I²C initialization to enable Flash/Torch modes or configure current levels. However, hardware Strobe and TX pins remain fully functional immediately after power-up, allowing basic flash control without I²C communication - as documented in Logic Control Pins table and Figure 15.
What capacitor types are explicitly recommended for LM2759SD/NOPB, and why?
TDK C1608X5R0J225 (2.2 µF, X5R, 0603) and C1608X5R0J475 (4.7 µF, X5R, 0603) are explicitly recommended for LM2759SD/NOPB. These X5R MLCCs offer low ESR (<20 mΩ), tight tolerance (±10%), and stable capacitance over temperature (±15% from -55°C to +85°C). Y5V/Z5U types are prohibited due to >80% capacitance loss at temperature extremes - per Capacitor Selection section (pages 13–14).
Does the LM2759SD/NOPB support automatic gain transition during Flash mode operation?
Yes - the LM2759SD/NOPB continuously monitors VGDX at the ISINK pin and transitions to the next higher gain (1x → 1.5x → 2x) whenever VGDX falls below 350 mV (typ.). Once elevated, gain remains locked until device shutdown; re-enabling resets to minimum gain required. This adaptive behavior is core to maintaining 1A current across varying LED VF and temperature - detailed in Charge Pump and Gain Transitions section (page 9).
LM2759SD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 2V ~ 4V
- Current - Output / Channel:
- 1A (Flash)
- Frequency:
- 1MHz
- Dimming:
- I2C
- Applications:
- Camera Flash
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WSON (3x3)
LM2759SD/NOPB FAQ
1.How can I place an order for LM2759SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2759SD/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 LM2759SD/NOPB reliable?
The price and inventory of LM2759SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2759SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2759SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2759SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2759SD/NOPB?
LM2759SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2759SD/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 LM2759SD/NOPB?
For technical support, including LM2759SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2759SD/NOPB requirements.
6.How does Aetrix verify that LM2759SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2759SD/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 LM2759SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2759SD/NOPB?
All LM2759SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2759SD/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 LM2759SD/NOPB part is unused and in its original packaging.
Return procedure for LM2759SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2759SD/NOPB Tags
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BCR420UE6433HTMA1
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