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Texas Instruments LM3530UMX-25A/NOPB
- Part No.:
- LM3530UMX-25A/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-XFBGA, DSBGA
- Datasheet:
-
LM3530UMX-25A/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 12DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3530UMX-25A/NOPB from Texas Instruments is a high-efficiency white-LED driver IC with dual ambient light sensing inputs, 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 LM3530UMX-25A/NOPB datasheet, LM3530UMX-25A/NOPB pinout, LM3530UMX-25A/NOPB application, or LM3530UMX-25A/NOPB equivalent, key selection criteria include its 500-kHz fixed-frequency boost architecture, programmable ALS zone mapping, true shutdown isolation, 1000:1 dimming ratio, and DSBGA-12 package compatibility with space-constrained portable displays.
Technical Context
The LM3530UMX-25A/NOPB integrates an asynchronous current-mode boost controller with a regulated 0.4-V current sink (ILED), enabling precise LED current regulation independent of forward voltage variation. Its dual ALS inputs (ALS1/ALS2) feed into an 8-bit A/D converter with configurable averaging time and 5-zone discriminator logic for ambient-adaptive brightness control.
It implements hardware enable (HWEN), interrupt signaling (INT) on ALS zone transitions, external PWM brightness override, and 40-V OVP sensing via dedicated OVP pin. The device uses internal soft-start, skip-mode at light load, and thermal shutdown at 140°C to ensure robust operation in battery-powered systems.
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 - enables driving up to 11 white LEDs in series (VF ≈ 3.6 V each). | LED Current Range | 0 mA to 29.5 mA in 127 steps - provides fine-grained, I²C-programmable dimming with 1000:1 ratio. |
| Switching Frequency | 500 kHz (±10%) - balances efficiency, EMI, and inductor size for portable applications. |
| Peak Switch Current | 839 mA (typ.) - sets maximum inductor energy storage and limits boost stage stress. |
| ALS Input Range | 0 V to 1 V - matches standard analog-output ambient light sensors (e.g., APDS-9005). |
| Thermal Shutdown | 140°C (typ.), 15°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LM3530UMX-25A/NOPB is housed in a 1.64 mm × 1.24 mm, 12-ball DSBGA (YFZ/YFQ) package with 0.4-mm pitch and bottom-side thermal pad. Ball assignment follows JEDEC MO-277 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (SDA) | I²C data line | Open-drain bidirectional interface for register read/write; requires external pull-up to VLOGIC. |
| A2 (SCL) | I²C clock line | Input-only clock signal; timing compliant with standard-mode (100 kHz) and fast-mode (400 kHz) I²C. |
| A3 (SW) | Boost switch node | Connects to inductor and diode anode; high dv/dt node requiring minimal trace length and ground shielding. |
| B1 (PWM) | Hardware brightness control | Logic-level input enabling direct PWM dimming or simple on/off control; overrides I²C settings when active. |
| B2 (INT) | ALS zone change flag | Active-low open-drain interrupt signaling transition between ambient light zones; requires external pull-up. |
| B3 (GND) | Power and signal ground | Primary reference for all analog and digital circuits; must be connected to low-impedance PCB ground plane. |
| C1 (ALS2) | Ambient light sensor input 2 | Analog input with programmable internal pulldown resistor (0.66 kΩ to 1.20 kΩ); selectable as active ALS source. |
| C2 (HWEN) | Hardware enable/reset | Active-high enable; pulling low forces full shutdown with <2 µA quiescent current and true isolation of LEDs/ALS. |
| C3 (IN) | Main power input | 2.7–5.5 V supply; requires ≥2.2 µF ceramic bypass capacitor placed adjacent to pin. |
| D1 (ALS1) | Ambient light sensor input 1 | Identical function to ALS2; software-selectable as primary ALS source or averaged with ALS2. |
| D2 (OVP) | Output overvoltage sense | Monitors output capacitor voltage; triggers shutdown if >40 V (25-V version uses different internal threshold). |
| D3 (ILED) | Current sink feedback | Regulated to 0.4 V; connects to LED cathode string; sets LED current via external sense resistor (RCS = 0.4 V / ILED). |
Key Features
| Feature | Design Value |
|---|---|
| Programmable dual ALS inputs | Enables adaptive backlighting using two independent ambient sensors or their average, reducing display flicker in non-uniform lighting. |
| I²C-compatible logarithmic/linear control | Supports perceptually uniform dimming (logarithmic) or linear current scaling-critical for consistent user experience across brightness levels. |
| True shutdown isolation | Disables LED current path and ALS inputs simultaneously, eliminating leakage paths and ensuring zero current draw in standby mode. |
| Internal soft-start | Ramps input current over ~3 ms to limit inrush during power-on, preventing voltage droop on shared battery rails. |
| Configurable ALS averaging time | 8 selectable averaging periods (16 ms to 1024 ms) allow trade-off between responsiveness and noise immunity in varying ambient conditions. |
Applications
| Smartphone LCD Backlighting | Personal Navigation Device (PND) Display |
|---|---|
Use Scenario: Dynamic backlight adjustment in handheld smartphones under rapidly changing indoor/outdoor lighting. IC Role / Device Role / Timing Role: White-LED driver with ambient-adaptive current regulation and I²C-based system-level brightness coordination. Use Value: Extends battery life by reducing LED current in low-light environments while preserving contrast and readability in sunlight. | Use Scenario: Sunlight-readable display in automotive-grade PNDs with wide temperature range and variable cabin illumination. IC Role / Device Role / Timing Role: High-voltage boost driver delivering stable current to 8–10-series LED strings, synchronized with GPS UI refresh cycles. Use Value: Maintains optimal luminance across −40°C to +85°C ambient, with ALS-triggered stepless ramping to avoid visual distraction during driving. |
| Tablet PC Front-Light Control | Industrial HMI Display Power |
Use Scenario: Dual-sensor ambient compensation for front-lit e-reader tablets used indoors and outdoors. IC Role / Device Role / Timing Role: Dual-ALS-input LED driver implementing zone-based brightness mapping with 5 programmable ambient zones. Use Value: Eliminates manual brightness adjustment by automatically matching display output to ambient lux level, improving usability and eye comfort. | Use Scenario: Ruggedized human-machine interface displays in factory automation panels exposed to fluorescent and LED ambient lighting. IC Role / Device Role / Timing Role: Robust LED driver with 40-V OVP and thermal shutdown, supporting long-term reliability in unventilated enclosures. Use Value: Ensures continuous display visibility despite voltage transients and ambient temperature swings, with no firmware dependency for basic operation. |
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-25A | Same die, tape-and-reel vs. cut-tape packaging; identical electrical specs and pinout. | No functional difference; differs only in packaging format and reel quantity. | Select LM3530UME-25A for automated SMT assembly requiring full reels. |
| LM3530UMX-40 | I²C address 0x38 (vs. 0x36); 40-V OVP version with same ALS and dimming features. | Compatible in same PCB layout but requires firmware I²C address update; suitable where higher OVP margin is needed. | Choose LM3530UMX-40 if system-level fault analysis indicates risk of >25-V transient overshoot on LED string. |
Compared with LM3530UME-25A, LM3530UMX-25A/NOPB offers identical performance in cut-tape form for prototyping and low-volume production; versus LM3530UMX-40, it provides tighter OVP threshold (25 V) for cost-sensitive designs where 40-V headroom is unnecessary.
Availability
LM3530UMX-25A/NOPB is available at Aetrix Electronics and suitable for smartphone LCD backlighting, personal navigation device displays, and industrial HMI applications requiring stable component supply, long lifecycle support, and RoHS-compliant packaging.
Supply support for LM3530UMX-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 and lighting solutions.
The LM3530UMX-25A/NOPB belongs to TI's LED backlight driver product line, engineered specifically for high-efficiency, ambient-adaptive display lighting in space- and power-constrained mobile devices.
FAQ
What is the I²C address of the LM3530UMX-25A/NOPB?
The LM3530UMX-25A/NOPB has a fixed I²C slave address of 0x36 (7-bit). This address is hardwired and cannot be changed via pins or registers. It is distinct from other variants like LM3530UMX-40 (0x38) and LM3530UMX-40B (0x39), allowing multiple LM3530 devices to coexist on the same bus when using different versions. Always verify address configuration in system firmware before initialization.
Does the LM3530UMX-25A/NOPB support both linear and logarithmic brightness control?
Yes, the LM3530UMX-25A/NOPB supports both modes via the Mapping Mode Select Bit (bit 6 of the BRT register). When set to 0, brightness scales exponentially with register code for perceptually uniform steps; when set to 1, LED current scales linearly. This flexibility allows system designers to match human vision response or simplify control algorithms. The LM3530UMX-25A/NOPB implements this entirely in hardware, requiring no host CPU interpolation.
How does the dual ALS input functionality work in the LM3530UMX-25A/NOPB?
The LM3530UMX-25A/NOPB accepts analog voltage inputs on ALS1 and ALS2 pins, each with independently programmable internal pulldown resistors (0.66–1.20 kΩ). The ALS Select bits configure operation as ALS1-only, ALS2-only, or averaged ALS1/ALS2. The 8-bit A/D converter digitizes the selected input, compares it against four user-defined zone boundaries (ZB0–ZB3), and maps to one of five target brightness levels (Z0T–Z4T). This enables robust ambient adaptation even with sensor mismatch or directional lighting gradients.
What is the purpose of the OVP pin on the LM3530UMX-25A/NOPB?
The OVP pin on the LM3530UMX-25A/NOPB connects directly to the positive terminal of the output capacitor to monitor boost output voltage. For the LM3530UMX-25A/NOPB variant, internal circuitry triggers shutdown if OVP exceeds 25 V (with 1-V hysteresis), protecting downstream LEDs and PCB traces from overvoltage failure. This is a hardware-level safety feature independent of I²C communication, ensuring fail-safe operation even during firmware lockup or I²C bus faults.
Can the LM3530UMX-25A/NOPB drive more than 11 white LEDs?
No, the LM3530UMX-25A/NOPB is rated for up to 11 white LEDs in series, based on its 40-V maximum output voltage and typical white LED forward voltage of ~3.6 V (11 × 3.6 V = 39.6 V). Attempting to drive 12 or more LEDs would exceed the 40-V absolute maximum rating and risk device damage or premature OVP shutdown. For higher LED counts, consider cascading drivers or selecting a higher-output-voltage IC such as the TPS61165. The LM3530UMX-25A/NOPB datasheet explicitly specifies "drives up to 11 LEDs in series" as a key feature.
LM3530UMX-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
LM3530UMX-25A/NOPB FAQ
1.How can I place an order for LM3530UMX-25A/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3530UMX-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 LM3530UMX-25A/NOPB reliable?
The price and inventory of LM3530UMX-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 LM3530UMX-25A/NOPB is usually 5 days.
3.What payment methods are accepted for LM3530UMX-25A/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3530UMX-25A/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3530UMX-25A/NOPB?
LM3530UMX-25A/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3530UMX-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 LM3530UMX-25A/NOPB?
For technical support, including LM3530UMX-25A/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3530UMX-25A/NOPB requirements.
6.How does Aetrix verify that LM3530UMX-25A/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3530UMX-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 LM3530UMX-25A/NOPB meets industry standards.
7.What is the process for return or replacement of LM3530UMX-25A/NOPB?
All LM3530UMX-25A/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3530UMX-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 LM3530UMX-25A/NOPB part is unused and in its original packaging.
Return procedure for LM3530UMX-25A/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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