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Texas Instruments LM3530UME-40B/NOPB
- Part No.:
- LM3530UME-40B/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-XFBGA, DSBGA
- Datasheet:
-
LM3530UME-40B/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:490
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Product details
Overview
LM3530UME-40B/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 displays.
For engineers reviewing the LM3530UME-40B/NOPB datasheet, LM3530UME-40B/NOPB pinout, LM3530UME-40B/NOPB application, or LM3530UME-40B/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, programmable logarithmic/linear brightness control, and DSBGA-12 package compatibility with space-constrained mobile designs.
Technical Context
The LM3530UME-40B/NOPB integrates an asynchronous current-mode boost converter with a regulated current sink (ILED = 0–29.5 mA) and dual analog ALS inputs supporting zone-based brightness adaptation. Its I²C interface enables 127-step LED current programming and 8 full-scale current levels, while internal soft-start limits inrush current during power-up.
It features independent ALS resistor select registers (15 options per input), programmable averaging time (8 settings), and zone boundary discrimination across five ambient light zones. The device uses a 500-kHz switching frequency with 10%–94% duty cycle range and includes thermal shutdown at 140°C with 15°C hysteresis.
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 (VF ≈ 3.6 V each) with margin. |
| LED Current Range | 0 mA to 29.5 mA in 127 discrete steps - enables precise brightness control with 1000:1 dimming ratio. |
| Switching Frequency | 500 kHz (±10%) - balances efficiency, EMI, and inductor size for portable applications. |
| ALS Inputs | Two independent analog inputs (ALS1, ALS2) with software-selectable pull-down resistors (0.63–1.20 kΩ) - interfaces directly with common ambient light sensors (e.g., APDS-9005). |
| Overvoltage Protection | 40 V threshold with hysteresis - prevents damage from output capacitor failure or open-circuit LED string. |
| Thermal Shutdown | 140°C activation / 125°C release - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LM3530UME-40B/NOPB is housed in a 1.64 mm × 1.24 mm, 12-ball DSBGA (YFZ/YFQ) package with 0.4-mm pitch, optimized for ultra-thin mobile PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (SDA) | I²C data line | Open-drain bidirectional serial data interface; requires external pull-up to VLOGIC (typically 1.8 V or 3.3 V). |
| A2 (SCL) | I²C clock line | Input-only clock signal; supports standard/fast-mode I²C timing (tLOW/tHIGH ≥ 1.3 µs). |
| A3 (SW) | Boost switch node | Connects to inductor and diode anode; high dv/dt node requiring minimal trace length and ground shielding. |
| B1 (PWM) | External brightness control | Logic-level enable/disable input; active-high PWM signal overrides I²C brightness setting when EN_PWM = 1. |
| B2 (INT) | ALS zone change interrupt | Open-drain output asserting low when ambient light crosses programmed zone boundaries; debounced by internal logic. |
| B3 (GND) | Power and signal reference | Primary ground return for boost circuitry, ALS inputs, and digital logic; must be low-impedance plane connection. |
| C1 (ALS2) | Ambient light sensor input 2 | Analog input with programmable internal pulldown resistor; accepts 0–1 V ALS voltage for zone mapping. |
| C2 (HWEN) | Hardware enable/reset | Active-high enable; pulling low forces true shutdown (ILED = 0, ALS inputs high-Z, IQ < 2 µA). |
| 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; selectable as primary ALS source via ALS Select register bit [6:5]. |
| D2 (OVP) | Output voltage sense | Monitors boost output via resistive divider; triggers OVP shutdown if voltage exceeds 40 V threshold. |
| D3 (ILED) | Current sink output | Regulated to 0.4 V headroom; connects to cathode of LED string; sets LED current via external sense resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Dual programmable ALS inputs | Enables adaptive backlighting using two independent ambient sensors or redundancy; each supports 15 internal resistor values for sensor voltage scaling. |
| I²C + PWM dual control | Allows system-level brightness control via host processor (I²C) or direct hardware modulation (PWM), with seamless priority arbitration. |
| True shutdown isolation | Disables LED current path *and* places ALS inputs in high-impedance state - eliminates leakage paths during sleep mode. |
| Content-adjusted backlighting | Maps ambient light zones (5) to user-defined LED current targets (Z0T–Z4T), preserving display contrast while maximizing battery life. |
| Internal soft-start | Ramps input current over ~3 ms (typ.) to limit inrush into input capacitor and prevent supply droop during startup. |
Applications
| Smartphone LCD Backlighting | Personal Navigation Device Display |
|---|---|
Use Scenario: Dynamic backlight adjustment in handheld smartphones under varying ambient lighting (indoor, outdoor, low-light). IC Role / Device Role / Timing Role: White-LED driver with ambient light-adaptive current regulation and I²C-configurable zone mapping. Use Value: Extends battery runtime by reducing LED current in low ambient light while maintaining perceptible display luminance via logarithmic dimming. |
Use Scenario: Sunlight-readable display in automotive-grade portable navigation units with wide temperature operation. IC Role / Device Role / Timing Role: High-efficiency boost driver delivering stable 29.5 mA to 8-series white LEDs across −40°C to 85°C. Use Value: Maintains consistent brightness across temperature extremes using internal thermal compensation and 40-V OVP for reliability in automotive electrical environments. |
| 2–11 Series White-LED Backlit Display Power Source | Tablet PC Adaptive Backlight System |
Use Scenario: Single-chip solution powering diverse LED configurations in industrial HMIs and medical displays. IC Role / Device Role / Timing Role: Programmable current-mode boost controller with flexible ALS input routing and 127-step resolution. Use Value: Eliminates need for external current-sense amplifiers or discrete ALS interface circuitry - reduces BOM count and layout area. |
Use Scenario: Dual-ALS implementation using front/rear ambient sensors to distinguish user-facing vs. environment light conditions. IC Role / Device Role / Timing Role: Dual-input ALS processor with programmable averaging time (up to 1024 ms) and zone transition hysteresis. Use Value: Prevents flicker and false triggering during transient light changes (e.g., passing clouds, moving shadows) via configurable noise rejection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white-LED driver with ambient light sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59401RTQT | 16-channel constant-current sink with dot-correction and grayscale PWM; no integrated boost, no ALS inputs. | Requires external boost converter and separate ALS IC; suited for RGB LED arrays, not single-string white backlighting. | Select when driving multiple independent LED strings with per-channel current tuning, not ambient-adaptive single-string backlighting. |
| LM3532TME-40/NOPB | Successor IC with identical pinout, enhanced ALS resolution (10-bit), lower quiescent current (350 µA), and improved thermal shutdown accuracy. | Drop-in replacement with extended feature set; supports same DSBGA-12 footprint and I²C register map with backward-compatible defaults. | Prefer for new designs requiring higher ALS precision and lower standby power; verify firmware compatibility with updated zone boundary registers. |
Compared with TLC59401RTQT, LM3530UME-40B/NOPB integrates boost conversion and ALS processing in one chip, eliminating external components and simplifying layout. Against LM3532TME-40/NOPB, it offers proven field reliability and broader legacy support but lacks the newer device's finer ALS quantization and reduced IQ.
Availability
LM3530UME-40B/NOPB is available at Aetrix Electronics and suitable for smartphone LCD backlighting, personal navigation device displays, and 2–11 series white-LED backlit display power sources requiring stable component supply across production lifecycles.
Supply support for LM3530UME-40B/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 display solutions.
The LM3530UME-40B/NOPB belongs to TI's LED backlight driver product line, engineered specifically for adaptive, energy-efficient LCD backlighting in battery-powered consumer electronics with stringent size and thermal constraints.
FAQ
What is the I²C address of the LM3530UME-40B/NOPB?
The LM3530UME-40B/NOPB has a fixed I²C slave address of 0x39 (7-bit), as confirmed in the "I2C Device Options" table of the SNVS606L datasheet. This distinguishes it from other variants like LM3530UME-40 (0x38) and enables coexistence on the same bus with compatible devices.
Does the LM3530UME-40B/NOPB support both linear and logarithmic brightness control?
Yes, the LM3530UME-40B/NOPB supports both modes via the Mapping Mode Select Bit (bit 0 of the BRT register). When set to 0, brightness follows a logarithmic scale matching human eye perception; when set to 1, it uses linear step increments - configurable per application requirements.
How does the ALS zone transition logic work in the LM3530UME-40B/NOPB?
The LM3530UME-40B/NOPB uses a dual-averaging algorithm: it samples ALS inputs at 16 kHz, averages over user-programmed intervals (8 options, up to 1024 ms), then applies hysteresis and two-cycle validation before changing zones. This prevents flicker from transient light changes while ensuring responsive adaptation to steady-state ambient shifts.
What is the maximum number of white LEDs the LM3530UME-40B/NOPB can drive in series?
The LM3530UME-40B/NOPB supports up to 11 white LEDs in series, based on its 40-V maximum output voltage and typical forward voltage of ~3.6 V per LED at 20 mA. Driving 11 LEDs yields ~39.6 V, leaving 0.4 V margin for current-sense headroom and tolerance.
Can the LM3530UME-40B/NOPB operate without I²C configuration?
Yes - the LM3530UME-40B/NOPB powers up with factory-default register values: full-scale current = 19 mA, ALS enabled on ALS1, exponential mapping, and zone boundaries set to typical defaults. Basic operation (including PWM control and ALS auto-adjustment) functions immediately after HWEN assertion without I²C initialization.
LM3530UME-40B/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-40B/NOPB FAQ
1.How can I place an order for LM3530UME-40B/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3530UME-40B/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-40B/NOPB reliable?
The price and inventory of LM3530UME-40B/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-40B/NOPB is usually 5 days.
3.What payment methods are accepted for LM3530UME-40B/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3530UME-40B/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3530UME-40B/NOPB?
LM3530UME-40B/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3530UME-40B/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-40B/NOPB?
For technical support, including LM3530UME-40B/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3530UME-40B/NOPB requirements.
6.How does Aetrix verify that LM3530UME-40B/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3530UME-40B/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-40B/NOPB meets industry standards.
7.What is the process for return or replacement of LM3530UME-40B/NOPB?
All LM3530UME-40B/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3530UME-40B/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-40B/NOPB part is unused and in its original packaging.
Return procedure for LM3530UME-40B/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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