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Texas Instruments LM3530UME-25A/NOPB
- Part No.:
- LM3530UME-25A/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-XFBGA, DSBGA
- Datasheet:
-
LM3530UME-25A/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
LM3530UME-25A/NOPB from Texas Instruments is a high-efficiency white-LED driver IC with programmable ambient light sensing, I²C-compatible interface, and 25-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 achieves 90% efficiency in smartphone LCD backlighting applications.
For engineers reviewing the LM3530UME-25A/NOPB datasheet, LM3530UME-25A/NOPB pinout, LM3530UME-25A/NOPB application, or LM3530UME-25A/NOPB equivalent, this page provides verified pin functions, dual ALS input configuration, 1000:1 dimming ratio, 500-kHz fixed-frequency boost operation, and real-world design meaning for backlight power management in portable displays.
Technical Context
The LM3530UME-25A/NOPB integrates an asynchronous current-mode boost converter with regulated current sink (ILED = 0–29.5 mA), dual programmable ALS inputs (ALS1/ALS2), and I²C register mapping for zone-based brightness control. Its 500-kHz switching frequency enables compact magnetics while supporting output voltages up to 40 V.
It implements true shutdown isolation for both LEDs and ALS inputs via HWEN, supports logarithmic or linear brightness control modes, and features internal soft-start, thermal shutdown at 140°C, and 400-mV current-sense headroom for precise ILED regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - powers directly from single-cell Li-ion or USB-supplied rails without external LDO. |
| Max Output Voltage | 40 V - supports up to 11-series white LEDs (≈3.6 V/V) with margin for forward voltage variation. | OVP Threshold | 25 V - configured by part number variant (UME-25A); prevents damage during open-circuit or capacitor failure. |
| LED Current Range | 0 mA to 29.5 mA in 127 steps - enables fine-grained, flicker-free dimming with 1000:1 ratio for display readability. |
| Switching Frequency | 500 kHz ±50 kHz - balances EMI, inductor size (e.g., 10–22 µH), and efficiency across load conditions. |
| Peak Switch Current | 839 mA typical - sets minimum inductor saturation current rating and defines maximum power delivery capability. |
| Ambient Light Inputs | ALS1 & ALS2 with 15 selectable internal pull-down resistors (0.63–1.20 kΩ) - interfaces with analog-output ALS sensors without external biasing. |
Pinout & Package
LM3530UME-25A/NOPB uses a 12-pin DSBGA (YFQ/YFZ) package measuring 1.64 mm × 1.24 mm, optimized for space-constrained mobile PCBs with bottom-side soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (SDA) | I²C data line | Open-drain bidirectional interface for brightness register writes, ALS zone configuration, and status reads. |
| A2 (SCL) | I²C clock input | Accepts standard-mode (100 kHz) or fast-mode (400 kHz) clocks; timing compliant per JEDEC JESD79. |
| A3 (SW) | Boost switch node | Connects to inductor and diode anode; requires low-inductance layout to minimize EMI and voltage spikes. |
| B1 (PWM) | External brightness control | Logic-level input enabling simple on/off or PWM-based dimming independent of I²C bus activity. |
| B2 (INT) | ALS zone change interrupt | Active-low open-drain signal alerts host processor when ambient light crosses programmed zone boundaries. |
| B3 (GND) | Power and signal ground | Common reference for all analog/digital circuits; must be low-impedance plane beneath IC footprint. |
| C1 (ALS2) | Secondary ambient light sensor input | Analog input with software-selectable internal pull-down; used for redundancy or multi-directional light sensing. |
| C2 (HWEN) | Hardware enable/reset | Active-high signal that fully disables boost, ALS, and I²C logic; draws ≤2 µA in shutdown. |
| C3 (IN) | Main power input | Requires ≥2.2 µF ceramic bypass capacitor placed within 2 mm of pin to suppress input ripple and noise. |
| D1 (ALS1) | Primary ambient light sensor input | Default active ALS channel unless reconfigured via ALS Select Register; supports same resistor selection as ALS2. |
| D2 (OVP) | Output overvoltage sense | Monitors positive terminal of output capacitor; triggers shutdown if voltage exceeds 25 V threshold. |
| D3 (ILED) | Current-sense feedback | Sinks regulated current to maintain 400 mV across internal sense resistor; defines LED string current accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable dual ALS inputs | Enables adaptive backlighting using two independent ambient sensors-e.g., front-facing + side-facing-to reject localized glare and improve user experience. |
| I²C-compatible logarithmic/linear control | Logarithmic mode matches human eye response for perceptually uniform dimming; linear mode simplifies calibration in factory test environments. |
| True shutdown isolation | Disables LED current path, ALS inputs, and internal regulators simultaneously-reducing system standby current to ≤2 µA without external FETs. |
| Internal soft-start | Ramps input current over ~3 ms to prevent inrush-induced voltage droop on shared battery rails during power-up. |
| Zone-based ambient light response | Five programmable brightness zones (Z0–Z4) with hysteresis prevent flickering during marginal light transitions-e.g., moving between indoor/outdoor lighting. |
Applications
| Smartphone LCD Backlighting | Personal Navigation Device (PND) Display |
|---|---|
|
Use Scenario: Dynamic backlight adjustment in handheld smartphones under varying ambient illumination (e.g., sunlight, office, night). IC Role / Device Role / Timing Role: White-LED driver with integrated ALS processing and I²C register control; manages LED current based on real-time ambient light zones. Use Value: Extends battery life by reducing LED current in low-light conditions while maintaining display contrast and readability-validated at 90% peak efficiency. |
Use Scenario: Outdoor-readable display in automotive-grade PNDs exposed to rapid ambient light changes (e.g., tunnel entry/exit). IC Role / Device Role / Timing Role: Adaptive backlight controller with 25-V OVP and thermal shutdown; ensures safe operation during voltage transients and high-temperature environments. Use Value: Maintains consistent display luminance across −40°C to 85°C operating range using dual ALS inputs and programmable averaging time (1–1024 ms). |
| Tablet PC Front Panel Backlight | Industrial HMI Display Power |
|
Use Scenario: High-resolution tablet display requiring smooth, stepless dimming across 1000:1 range without visible PWM artifacts. IC Role / Device Role / Timing Role: Precision current-mode boost regulator with 127-step I²C brightness control and exponential ramp rate programming. Use Value: Eliminates visual stepping via configurable ramp rates (8 µs to 65.5 ms per step), ensuring imperceptible transitions during auto-brightness adjustments. |
Use Scenario: Ruggedized human-machine interface in factory automation where ESD immunity and long-term reliability are critical. IC Role / Device Role / Timing Role: Robust LED driver with ±2000-V HBM ESD rating, 40-V absolute max SW voltage, and DSBGA package for mechanical stability. Use Value: Reduces field failures by tolerating industrial board-level ESD events and maintaining regulation during 125°C junction temperature excursions. |
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 | 40-V OVP threshold instead of 25 V; identical pinout, I²C register map, and ALS functionality. | Better suited for higher-output-voltage LED strings (e.g., >9 LEDs) or systems with less stringent OVP margin requirements. | Select LM3530UME-40 only if output voltage may exceed 25 V during fault conditions or transient events. |
| TPS61165DRVR | Fixed 1.2-MHz switching frequency, no ALS inputs, no I²C interface-uses analog/PWM dimming only. | Lacks ambient light adaptation; requires external microcontroller for closed-loop brightness control. | Choose TPS61165DRVR for cost-sensitive designs where ALS is not required and simpler dimming suffices. |
Compared with LM3530UME-25A/NOPB, LM3530UME-40 offers higher OVP headroom but identical ALS and control architecture, while TPS61165DRVR trades ambient intelligence for lower BOM count and higher switching frequency-making it suitable only for static or externally managed backlighting.
Availability
LM3530UME-25A/NOPB is available at Aetrix Electronics and suitable for smartphone LCD backlighting, personal navigation device displays, and industrial HMI display power requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LM3530UME-25A/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 LM3530UME-25A/NOPB belongs to TI's white-LED driver product line, engineered specifically for adaptive backlighting in battery-powered displays-emphasizing efficiency, ALS integration, and compact packaging for mobile applications.
FAQ
What is the OVP threshold for LM3530UME-25A/NOPB?
The LM3530UME-25A/NOPB has a factory-configured 25-V overvoltage protection threshold on the OVP pin. This setting is fixed per orderable number and cannot be changed via I²C registers. It triggers shutdown if the output capacitor voltage exceeds 25 V, protecting downstream LEDs and capacitors. The 25-V version is distinct from the 40-V variant (e.g., LM3530UME-40).
How does the dual ALS input function in LM3530UME-25A/NOPB?
In LM3530UME-25A/NOPB, ALS1 and ALS2 accept analog voltage outputs from ambient light sensors. The device selects one input (or averages both) via the ALS Select Register. Each input has 15 software-programmable internal pull-down resistors (0.63–1.20 kΩ), eliminating external bias components. Zone-based brightness adjustment occurs only when the active ALS input crosses one of four programmable boundary thresholds (ZB0–ZB3).
Can LM3530UME-25A/NOPB drive more than 11 white LEDs?
No-LM3530UME-25A/NOPB is rated for up to 11 series white LEDs, based on its 40-V maximum output voltage and typical forward voltage of ~3.6 V per LED. Driving 12 LEDs would require ≥43.2 V, exceeding the 40-V absolute maximum rating and risking OVP activation or device stress. For higher LED counts, consider a multi-channel driver or higher-voltage boost IC.
What is the purpose of the ILED pin on LM3530UME-25A/NOPB?
The ILED pin on LM3530UME-25A/NOPB serves as the regulated current-sink feedback node. Internally, the IC maintains 400 mV across a precision sense resistor connected between ILED and the LED cathode. This voltage sets the LED current (ILED = 0.4 V / RSENSE), enabling accurate, temperature-stable current regulation independent of LED forward voltage drift.
Does LM3530UME-25A/NOPB support both logarithmic and linear brightness control?
Yes-LM3530UME-25A/NOPB supports both modes via the Mapping Mode Select Bit in the BRT Register. Logarithmic mode provides perceptually uniform dimming steps aligned with human vision response, while linear mode delivers equal current increments per code step-ideal for factory calibration and deterministic testing workflows.
LM3530UME-25A/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-XFBGA, 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
LM3530UME-25A/NOPB FAQ
1.How can I place an order for LM3530UME-25A/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3530UME-25A/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 LM3530UME-25A/NOPB reliable?
The price and inventory of LM3530UME-25A/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3530UME-25A/NOPB is usually 5 days.
3.What payment methods are accepted for LM3530UME-25A/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3530UME-25A/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3530UME-25A/NOPB?
LM3530UME-25A/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3530UME-25A/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 LM3530UME-25A/NOPB?
For technical support, including LM3530UME-25A/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3530UME-25A/NOPB requirements.
6.How does Aetrix verify that LM3530UME-25A/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3530UME-25A/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 LM3530UME-25A/NOPB meets industry standards.
7.What is the process for return or replacement of LM3530UME-25A/NOPB?
All LM3530UME-25A/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3530UME-25A/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 LM3530UME-25A/NOPB part is unused and in its original packaging.
Return procedure for LM3530UME-25A/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3530UME-25A/NOPB Tags
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