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Texas Instruments LM3530TMX-40/NOPB
- Part No.:
- LM3530TMX-40/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
LM3530TMX-40/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 12DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3530TMX-40/NOPB from Texas Instruments is a high-efficiency white-LED driver IC with programmable ambient light sensing, I²C-compatible interface, and 40-V overvoltage protection. It delivers up to 29.5 mA LED current across 2–11 series LEDs, operates from 2.7 V to 5.5 V input, and supports logarithmic/linear brightness control for smartphone LCD backlighting.
For engineers reviewing the LM3530TMX-40/NOPB datasheet, LM3530TMX-40/NOPB pinout, LM3530TMX-40/NOPB application, or LM3530TMX-40/NOPB equivalent, key selection criteria include dual ALS input programmability, 1000:1 dimming ratio, true shutdown isolation, 500-kHz fixed-frequency boost operation, and DSBGA-12 package compatibility with space-constrained portable displays.
Technical Context
The LM3530TMX-40/NOPB integrates an asynchronous current-mode boost controller with a regulated 400-mV current-sink reference (VREG_CS) and dual analog ALS inputs (ALS1/ALS2) featuring 15 selectable internal pull-down resistors per channel. Its 500-kHz switching frequency enables high efficiency across wide output voltage ranges (up to 40 V), while the 839-mA peak NMOS switch current limit ensures robust transient handling.
It implements zone-based ambient light adaptation using four programmable boundary thresholds (ZB0–ZB3) and five target brightness levels (Z0T–Z4T), with ALS averaging time configurable in eight steps (16 ms to 1024 ms). The device supports both I²C register programming and external PWM brightness control, with independent enable via HWEN and interrupt signaling via INT on ALS zone transitions.
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. |
| Max Output Voltage | 40 V - accommodates up to 11 white LEDs in series (≈3.6 V each) with margin for forward-voltage variation. | LED Current Range | 0 mA to 29.5 mA in 127 steps - enables precise luminance control with 1000:1 dimming ratio for display uniformity. |
| Switching Frequency | 500 kHz (±10%) - balances efficiency, EMI, and inductor size; fixed-frequency simplifies filtering. |
| ALS Inputs | Two independent analog inputs (ALS1, ALS2) with software-selectable 1.07–1.20 kΩ internal pull-downs - interfaces directly with common photodiode-based ambient light sensors. |
| Overvoltage Protection | 40 V threshold with hysteresis - protects output capacitor and LEDs against boost regulation failure or open-circuit conditions. |
| Quiescent Current | 490–600 µA - minimizes battery drain during active operation; drops to ≤2 µA in shutdown mode. |
Pinout & Package
LM3530TMX-40/NOPB uses a 12-pin DSBGA (YFQ/YFZ) package measuring 1.64 mm × 1.24 mm with 0.4-mm pitch, optimized for ultra-thin mobile display modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (SDA) | I²C data line | Open-drain bidirectional serial data interface compliant with standard-mode I²C timing (400 kHz max). |
| A2 (SCL) | I²C clock line | Input-only clock signal; synchronizes register reads/writes and brightness updates. |
| A3 (SW) | Boost switch node | Connects to inductor and diode anode; carries high-frequency pulsed current up to 839 mA peak. |
| B1 (PWM) | External brightness control | Logic-level input enabling simple analog-like dimming without I²C traffic; supports active-high or active-low polarity. |
| B2 (INT) | ALS zone change interrupt | Open-drain output pulses low when ambient light crosses programmed zone boundaries - triggers host processor response. |
| B3 (GND) | Power and signal ground | Common reference for all analog and digital circuits; requires low-impedance PCB connection to minimize noise coupling. |
| C1 (ALS2) | Secondary ambient light sensor input | Analog input with programmable internal pull-down resistor; used with ALS1 for differential or averaged ambient sensing. |
| C2 (HWEN) | Hardware enable/reset | Active-high enable; pulling low forces full shutdown with true isolation of LEDs and ALS inputs (≤2 µA supply current). |
| C3 (IN) | Main power input | 2.7–5.5 V supply input; requires ≥2.2 µF ceramic bypass capacitor placed near pin to suppress high-frequency ripple. |
| D1 (ALS1) | Primary ambient light sensor input | Analog input with independently programmable pull-down; default active ALS channel unless ALS Select bit configures averaging or ALS2 priority. |
| D2 (OVP) | Output voltage sense | Monitors boost output at positive terminal of COUT; triggers shutdown if voltage exceeds 40 V threshold. |
| D3 (ILED) | Current-sink feedback node | Regulated to 400 mV by internal error amplifier; sets LED current via external sense resistor (RSENSE = 0.4 V / ILED). |
Key Features
| Feature | Design Value |
|---|---|
| Dual programmable ALS inputs | ALS1 and ALS2 support independent resistor selection (15 options each), high-impedance disable, and zone-based adaptive backlighting without host CPU intervention. |
| I²C + PWM dual control | Full 7-bit brightness register access via I²C plus real-time analog-style dimming via logic-level PWM input - enables hybrid control architectures. |
| True shutdown isolation | HWEN = low disconnects power to LEDs and disables ALS inputs, reducing total system current to ≤2 µA - critical for standby battery life. |
| Internal soft-start | Ramps input current from 0 to 300 mA in ~3 ms (typ.) using 10-µH inductor - prevents inrush-induced voltage droop on shared power rails. |
| 40-V OVP with hysteresis | Triggers shutdown at 40 V (±1 V), re-enables at 39 V - protects against open-LED fault, capacitor aging, or regulator instability without false trips. |
Applications
| Smartphone LCD Backlighting | Personal Navigation Device (PND) Display |
|---|---|
Use Scenario: Adaptive brightness control in handheld smartphones under varying ambient lighting (indoor, outdoor, low-light). IC Role / Device Role / Timing Role: White-LED driver with integrated ambient light sensing and closed-loop current regulation - manages backlight intensity autonomously based on ALS input. Use Value: Extends battery runtime by reducing LED current in low-light environments while maintaining perceptible display contrast; eliminates need for separate ALS ADC and microcontroller firmware. | Use Scenario: Sunlight-readable display in automotive-grade PNDs requiring stable brightness across temperature and illumination gradients. IC Role / Device Role / Timing Role: High-voltage boost LED driver with 40-V OVP and −40°C to 85°C operating range - sustains 11-LED string operation despite wide VIN and thermal swings. Use Value: Ensures consistent luminance without manual adjustment; 1000:1 dimming ratio preserves detail in both bright daylight and nighttime use. |
| Tablet PC Display Power | Industrial Handheld Terminal |
Use Scenario: Dual-ALS input configuration for directional ambient sensing (e.g., front vs. rear light detection) in tablets with front-facing cameras. IC Role / Device Role / Timing Role: Programmable ALS zone discriminator with 4 boundary registers and 5 target levels - enables context-aware backlight mapping (e.g., video playback vs. document reading). Use Value: Improves user experience via seamless brightness transitions; ALS averaging time (16–1024 ms) rejects transient shadows and flicker from artificial lighting. | Use Scenario: Ruggedized industrial terminal operating in factory environments with dust, vibration, and wide temperature excursions. IC Role / Device Role / Timing Role: DSBGA-12 packaged LED driver with 839-mA current limit and thermal shutdown (140°C) - withstands mechanical stress and thermal cycling. Use Value: Delivers reliable backlight operation without derating; true shutdown isolation meets industrial low-power requirements during sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white-LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530UME-40 | Same core functionality and pinout; differs only in tape-and-reel packaging (UMX vs. TMX) and minor assembly traceability codes. | No functional difference; identical electrical specs, ALS behavior, and thermal performance. | Select LM3530UME-40 for automated SMT placement requiring different reel diameter or carrier tape format. |
| TPS61165DRVR | Single-ALS-input boost driver with 36-V OVP, 1.2-MHz switching, and no built-in zone-based ALS algorithm - requires external MCU for ambient adaptation. | Lacks dual ALS inputs, programmable zone boundaries, and automatic brightness mapping; suited for simpler fixed-brightness or MCU-controlled systems. | Choose TPS61165DRVR when cost sensitivity outweighs autonomous ALS features, or when existing firmware already handles ambient compensation. |
Compared with LM3530UME-40, the LM3530TMX-40/NOPB offers identical performance but targets different logistics channels; versus TPS61165DRVR, it trades higher integration (dual ALS, zone engine, I²C registers) for slightly lower switching frequency and larger minimum inductor value.
Availability
LM3530TMX-40/NOPB is available at Aetrix Electronics and suitable for smartphone LCD backlighting, personal navigation device displays, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3530TMX-40/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 portable power solutions.
The LM3530TMX-40/NOPB belongs to TI's high-efficiency LED driver product line, designed specifically for adaptive backlighting in space-constrained mobile displays where ambient light responsiveness, battery efficiency, and integration density are critical.
FAQ
What is the maximum number of white LEDs the LM3530TMX-40/NOPB can drive in series?
The LM3530TMX-40/NOPB supports up to 11 white LEDs in series, enabled by its 40-V output overvoltage protection and ability to regulate output voltages up to that level. This assumes typical forward voltages of ~3.6 V per LED at operating current, leaving sufficient headroom for variations across temperature and manufacturing tolerances. The boost converter's 839-mA peak switch current ensures stable operation even with higher-string-count configurations.
Does the LM3530TMX-40/NOPB require external components for ambient light sensing?
Yes - the LM3530TMX-40/NOPB requires external ambient light sensors (e.g., photodiodes or analog-output ALS ICs like APDS-9005) connected to ALS1 and ALS2 pins. However, it integrates 15 programmable internal pull-down resistors per ALS input, eliminating the need for external biasing networks. Only the sensor itself and optional RC filtering are required; no external ADC or microcontroller is needed for basic zone-based adaptation.
How does the LM3530TMX-40/NOPB handle thermal overload?
The LM3530TMX-40/NOPB incorporates internal thermal shutdown that activates at approximately 140°C junction temperature and releases at 125°C. During shutdown, the device halts switching, disables the LED current sink, and places ALS inputs in high-impedance state. This protects against permanent damage during sustained high-power operation or poor PCB thermal design. Recovery is automatic once junction temperature falls below the hysteresis threshold.
Can the LM3530TMX-40/NOPB operate without I²C communication?
Yes - the LM3530TMX-40/NOPB supports full functionality via the external PWM pin alone. When EN_PWM bit is set to 1 in the control register, brightness is determined solely by PWM duty cycle, bypassing I²C registers. Hardware enable (HWEN) and shutdown remain fully operational. I²C is required only for configuring ALS zones, ramp rates, full-scale current, or linear/logarithmic mapping - not for basic LED current regulation.
What is the purpose of the INT pin on the LM3530TMX-40/NOPB?
The INT pin on the LM3530TMX-40/NOPB is an open-drain interrupt output that asserts low whenever the ambient light condition crosses a programmed zone boundary (ZB0–ZB3), triggering a transition between brightness zones (Z0–Z4). This allows the host processor to log ambient events, synchronize UI updates, or initiate diagnostics without polling registers. The flag clears automatically upon reading the ALS Information Register.
LM3530TMX-40/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 40V
- Current - Output / Channel:
- 30mA
- Frequency:
- 500kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA
LM3530TMX-40/NOPB FAQ
1.How can I place an order for LM3530TMX-40/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3530TMX-40/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 LM3530TMX-40/NOPB reliable?
The price and inventory of LM3530TMX-40/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3530TMX-40/NOPB is usually 5 days.
3.What payment methods are accepted for LM3530TMX-40/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3530TMX-40/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3530TMX-40/NOPB?
LM3530TMX-40/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3530TMX-40/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 LM3530TMX-40/NOPB?
For technical support, including LM3530TMX-40/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3530TMX-40/NOPB requirements.
6.How does Aetrix verify that LM3530TMX-40/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3530TMX-40/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 LM3530TMX-40/NOPB meets industry standards.
7.What is the process for return or replacement of LM3530TMX-40/NOPB?
All LM3530TMX-40/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3530TMX-40/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 LM3530TMX-40/NOPB part is unused and in its original packaging.
Return procedure for LM3530TMX-40/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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