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Texas Instruments LM3530UMX-40/NOPB
- Part No.:
- LM3530UMX-40/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-XFBGA, DSBGA
- Datasheet:
-
LM3530UMX-40/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 12DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3530UMX-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, supports dual ALS inputs (ALS1/ALS2), and operates from 2.7 V to 5.5 V input - enabling adaptive LCD backlighting in smartphones and portable navigation devices.
For engineers reviewing the LM3530UMX-40/NOPB datasheet, LM3530UMX-40/NOPB pinout, LM3530UMX-40/NOPB application, or LM3530UMX-40/NOPB equivalent, key selection criteria include its 1000:1 dimming ratio, 500-kHz fixed-frequency boost architecture, true shutdown isolation for LEDs and ALS inputs, internal soft-start, and programmable logarithmic/linear brightness control via I²C or external PWM.
Technical Context
The LM3530UMX-40/NOPB integrates an asynchronous current-mode boost controller with a regulated 0.4-V current sink (ILED) and dual analog ALS inputs. Its 500-kHz switching frequency enables compact magnetics while maintaining >90% efficiency across output voltages up to 40 V. The device uses internal 15-step programmable pull-down resistors per ALS input (1.074 kΩ to 0.629 kΩ typical) and supports zone-based brightness mapping with five user-defined ambient light zones.
It implements three operating modes - continuous conduction, discontinuous conduction, and skip mode - to optimize efficiency at light loads. The I²C interface (0x38 address) provides full register access to brightness codes (0–127), full-scale current (8 levels), ramp rate (3-bit), ALS resistor select (4-bit), and zone boundary/target registers - all synchronized with hardware enable (HWEN) and interrupt (INT) signaling.
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 VF each) with margin for OVP threshold. |
| LED Current Range | 0 mA to 29.5 mA in 127 steps - enables precise grayscale control and smooth dimming transitions. |
| Dimming Ratio | 1000:1 - achieved via I²C-programmable logarithmic brightness control or external PWM input. |
| Switching Frequency | 500 kHz ±10% - allows use of small 10–22 µH inductors and reduces EMI filtering requirements. |
| Peak Switch Current | 839 mA typical - sets maximum inductor energy storage and defines power capability for boost stage. |
| ALS Input Range | 0 V to 1 V - matches standard analog-output ambient light sensors (e.g., APDS-9005) without scaling. |
Pinout & Package
LM3530UMX-40/NOPB is housed in a 12-pin DSBGA (YFZ/YFQ) package measuring 1.64 mm × 1.24 mm with 0.4-mm pitch. The ultra-compact footprint supports high-density mobile PCB layouts and thermal performance optimized for thin-profile handhelds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 SDA | I²C data line | Open-drain bidirectional serial data interface; requires external 10-kΩ pull-up to VLOGIC. |
| A2 SCL | I²C clock line | Input-only clock signal; supports standard/fast-mode I²C timing (tLOW/tHIGH ≥2.5 µs). |
| A3 SW | Boost switch node | Connection point for inductor and Schottky diode anode; high dv/dt node requiring tight layout and low-inductance routing. |
| B1 PWM | External brightness control | Logic-level input (active-high default); enables simple on/off or PWM-dimming bypassing I²C. |
| B2 INT | ALS zone change flag | Open-drain interrupt output asserted when ambient light crosses programmed zone boundaries. |
| B3 GND | Power and signal reference | Dedicated ground plane connection; must be tied directly to thermal pad for optimal thermal performance. |
| C1 ALS2 | Ambient light sensor input 2 | Analog input with programmable internal pull-down resistor; used for dual-sensor averaging or redundancy. |
| C2 HWEN | Hardware enable/reset | Active-high enable; pulling low forces true shutdown with <2 µA quiescent current and ALS isolation. |
| 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 | Primary ALS input with independent resistor programming; default active input unless ALS Select bit = 1. |
| D2 OVP | Output voltage sense | Connects to positive terminal of output capacitor; triggers shutdown if VOVP exceeds 40 V (±1 V tolerance). |
| D3 ILED | Current sink feedback | Regulated to 0.4 V; sets LED current via external sense resistor (RSENSE = 0.4 V / ILED). |
Key Features
| Feature | Design Value |
|---|---|
| Dual programmable ALS inputs | Independent 4-bit resistor select per channel (15 values) enables compatibility with diverse analog ALS sensors (e.g., TSL2561, OPT3001). |
| I²C + PWM dual control | Full 7-bit brightness code access via I²C plus logic-level PWM pin for system-level brightness override without firmware intervention. |
| True shutdown isolation | Disables LED current path *and* ALS inputs simultaneously; reduces total system standby current to ≤2 µA. |
| Programmable zone-based dimming | Five ambient light zones (Z0–Z4) with independently set boundary thresholds (ZB0–ZB3) and target brightness levels (Z0T–Z4T). |
| Internal soft-start | Ramps input current from 0 to 300 mA in ~3 ms (typical), eliminating inrush spikes that could destabilize shared power rails. |
Applications
| Smartphone LCD Backlighting | Personal Navigation Device (PND) Display |
|---|---|
Use Scenario: Dynamic backlight adjustment based on ambient illumination in varying indoor/outdoor lighting conditions. IC Role / Device Role / Timing Role: White-LED driver with integrated ambient light sensing and closed-loop brightness regulation. Use Value: Extends battery life by reducing LED current in low-light environments while preserving display readability and contrast. |
Use Scenario: Sunlight-readable display operation during automotive navigation with rapid ambient light transitions. IC Role / Device Role / Timing Role: Adaptive backlight controller using dual ALS inputs to reject directional glare and stabilize perceived brightness. Use Value: Maintains consistent luminance across 0–100,000 lux range via programmable zone boundaries and 1000:1 dimming resolution. |
| Tablet PC Front Panel Illumination | Industrial Handheld Terminal Display |
Use Scenario: Content-adjusted backlighting where UI brightness scales with image content luminance and ambient light. IC Role / Device Role / Timing Role: I²C-configurable LED driver supporting both linear and logarithmic brightness mapping for perceptual uniformity. Use Value: Reduces eye strain and improves visual fidelity by matching human photopic response through programmable ramp rates and zone targets. |
Use Scenario: Ruggedized display operation in factory or warehouse settings with wide temperature (-40°C to +85°C) and lighting variability. IC Role / Device Role / Timing Role: High-reliability boost LED driver with 40-V OVP, thermal shutdown (140°C), and robust ESD protection (±2 kV HBM). Use Value: Ensures uninterrupted display functionality under voltage transients, thermal stress, and electrostatic discharge events. |
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 | Tape-and-reel packaging variant (same electrical specs, same DSBGA-12 package, identical I²C address 0x38). | No functional difference; differs only in packaging format (reel vs. cut tape) and orderable part number suffix. | Select LM3530UME-40 for automated SMT assembly requiring full reel delivery; LM3530UMX-40/NOPB is optimized for prototyping and low-volume production. |
| LM3532TME-40 | Successor device with dual independent boost channels (2× ILED outputs), enhanced ALS resolution (12-bit), and extended temperature range (–40°C to +125°C). | Supports dual-display or RGBW backlight systems; not pin-compatible due to 16-pin DSBGA package and different register map. | Choose LM3532TME-40 only when dual-channel drive, higher ALS precision, or extended junction temperature operation is required. |
Compared with LM3530UME-40, LM3530UMX-40/NOPB offers identical performance in cut-tape form for flexible procurement; versus LM3532TME-40, it provides cost-optimized single-channel operation with proven reliability in consumer-grade portable displays but lacks multi-channel capability and extended thermal rating.
Availability
LM3530UMX-40/NOPB is available at Aetrix Electronics and suitable for smartphone LCD backlighting, personal navigation device displays, and industrial handheld terminal designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3530UMX-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 LED driver innovation and mobile power solutions.
The LM3530UMX-40/NOPB belongs to TI's high-efficiency LED backlight driver product line, engineered specifically for adaptive, ambient-aware display illumination in space-constrained portable electronics.
FAQ
What is the I²C address of the LM3530UMX-40/NOPB?
The LM3530UMX-40/NOPB has a fixed I²C slave address of 0x38 (7-bit), as confirmed in the "I2C Device Options" table of the SNVS606L datasheet. This address applies exclusively to the -40 variants (LM3530UMX-40, LM3530UME-40, LM3530TME-40). No address pins or configuration bits alter this value, ensuring deterministic bus communication in multi-device systems.
Does the LM3530UMX-40/NOPB support both linear and logarithmic brightness control?
Yes, the LM3530UMX-40/NOPB supports both modes via the Mapping Mode Select Bit (bit 0 of the BRT Register). When set to 0, brightness scales exponentially (logarithmic) for perceptually uniform steps; when set to 1, it scales linearly. This dual-mode capability is implemented in hardware and requires no external components - the LM3530UMX-40/NOPB handles all mapping internally.
How does the LM3530UMX-40/NOPB handle ambient light sensor input selection between ALS1 and ALS2?
The LM3530UMX-40/NOPB selects the active ALS input via bits [6:5] of the ALS Configuration Register. Values 00b and 01b select ALS1 and ALS2 respectively; 10b enables averaging of both inputs; 11b disables ALS function. This selection is fully software-configurable over I²C and persists across hardware resets - no external switches or jumpers are needed to configure ALS1/ALS2 behavior in the LM3530UMX-40/NOPB.
What is the purpose of the OVP pin on the LM3530UMX-40/NOPB?
The OVP pin on the LM3530UMX-40/NOPB monitors output voltage and triggers immediate shutdown if the sensed voltage exceeds the 40-V threshold (±1 V tolerance). It must be connected directly to the positive terminal of the output capacitor. This dedicated overvoltage protection circuit safeguards LEDs and downstream components from catastrophic failure due to open-circuit LED string conditions or regulator instability - a critical safety feature absent in many basic boost drivers.
Can the LM3530UMX-40/NOPB operate without I²C configuration?
Yes, the LM3530UMX-40/NOPB supports standalone operation using only the PWM pin for brightness control and HWEN for enable/disable. Default factory settings (e.g., full-scale current = 19 mA, logarithmic mapping, ALS disabled) allow immediate LED current regulation without I²C initialization. However, full ambient light adaptation, zone programming, and fine-grained dimming require I²C access - the LM3530UMX-40/NOPB remains functional but limited in autonomous mode.
LM3530UMX-40/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-40/NOPB FAQ
1.How can I place an order for LM3530UMX-40/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3530UMX-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 LM3530UMX-40/NOPB reliable?
The price and inventory of LM3530UMX-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 LM3530UMX-40/NOPB is usually 5 days.
3.What payment methods are accepted for LM3530UMX-40/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3530UMX-40/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3530UMX-40/NOPB?
LM3530UMX-40/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3530UMX-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 LM3530UMX-40/NOPB?
For technical support, including LM3530UMX-40/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3530UMX-40/NOPB requirements.
6.How does Aetrix verify that LM3530UMX-40/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3530UMX-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 LM3530UMX-40/NOPB meets industry standards.
7.What is the process for return or replacement of LM3530UMX-40/NOPB?
All LM3530UMX-40/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3530UMX-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 LM3530UMX-40/NOPB part is unused and in its original packaging.
Return procedure for LM3530UMX-40/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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