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Texas Instruments LM3530UME-40/NOPB
- Part No.:
- LM3530UME-40/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-XFBGA, DSBGA
- Datasheet:
-
LM3530UME-40/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:499
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Product details
Overview
LM3530UME-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 displays.
For engineers reviewing the LM3530UME-40/NOPB datasheet, LM3530UME-40/NOPB pinout, LM3530UME-40/NOPB application, or LM3530UME-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, programmable logarithmic/linear brightness control, and DSBGA-12 package compatibility with space-constrained mobile designs.
Technical Context
The LM3530UME-40/NOPB integrates an asynchronous current-mode boost converter with a regulated 0.4-V current-sink reference (VREG_CS), 839-mA peak switch current limit, and internal soft-start. Its dual ALS inputs support zone-based brightness mapping using four programmable boundary thresholds (ZB0–ZB3) and five target registers (Z0T–Z4T).
Control is implemented via I²C (0x38 address) or external PWM input, with independent configuration of ramp rate (exponential/logarithmic), ALS averaging time (8 selectable settings), and ALS resistor select (15 internal pull-down values per input). The device enters skip mode at light loads to maintain >90% efficiency across output currents from 9.5 µA to 29.5 mA.
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 LDO pre-regulation. |
| Max Output Voltage | 40 V - supports up to 11 white LEDs in series (VF ≈ 3.6 V each) with margin for aging and temperature drift. |
| LED Current Range | 0 mA to 29.5 mA in 127 discrete steps - enables precise luminance control for content-adjusted backlighting. |
| Dimming Ratio | 1000:1 - achieves deep dimming without visible flicker or color shift, critical for HDR display compliance. |
| Switching Frequency | 500 kHz ±10% - balances EMI performance, inductor size (typ. 10–22 µH), and efficiency across load range. |
| ALS Inputs | Two independent analog inputs (ALS1, ALS2) with 15 programmable internal pull-down resistors - interfaces natively with common analog-output ambient light sensors (e.g., APDS-9005). |
| I²C Address | 0x38 - fixed hardware address for multi-device bus configurations; no address pins or conflicts. |
Pinout & Package
LM3530UME-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 PCBs and thermal performance (RθJA = 61.7°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (SDA) | I²C data line | Open-drain bidirectional interface for register read/write; requires external 10-kΩ pull-up to VLOGIC. |
| A2 (SCL) | I²C clock line | Input-only clock signal; timing compliant with standard-mode I²C (tLOW/tHIGH ≥ 1.3 µs, tSU;DAT ≥ 100 ns). |
| A3 (SW) | Boost switch node | Connects to inductor and Schottky diode anode; high dv/dt node requiring tight layout and minimal trace length. |
| B1 (PWM) | External brightness control | Logic-level input (VIH ≥ 1.26 V) enabling simple analog-like dimming or hardware enable/disable with 2-ms debounce. |
| B2 (INT) | ALS zone change flag | Open-drain interrupt output asserting low when active ALS input crosses programmed zone boundary (ZB0–ZB3). |
| B3 (GND) | Power and signal ground | Single ground reference for all analog/digital functions; must be connected to low-impedance PCB plane. |
| C1 (ALS2) | Ambient light sensor input 2 | Analog input with software-selectable internal pull-down (0.629–1.202 kΩ); high-impedance when disabled. |
| C2 (HWEN) | Hardware enable/reset | Active-high enable (VIH ≥ 1.26 V); pulls low to force full shutdown with <2 µA quiescent current. |
| 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 functionality to ALS2; used for dual-sensor differential or redundancy schemes. |
| D2 (OVP) | Output overvoltage sense | Monitors boost output via resistive divider; triggers shutdown if voltage exceeds 40 V (±1 V tolerance). |
| D3 (ILED) | Current-sink feedback | Regulated to 0.4 V; connects to LED cathode string to close current loop with ±1.5% accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable dual ALS interface | Supports independent configuration of ALS1/ALS2 pull-down resistors, averaging time (1–1024 ms), and zone mapping - eliminates external op-amps or ADCs for ambient-adaptive backlighting. |
| I²C + PWM dual control | Enables system-level brightness control via host processor (I²C) while retaining hardware fallback (PWM) for fast enable/disable or emergency dimming without firmware intervention. |
| True shutdown isolation | Disables LED current sink, ALS inputs, and boost converter simultaneously, reducing total system current to ≤2 µA - extends battery life during display-off states. |
| Logarithmic/linear brightness mapping | Configurable via register bit to match human eye response (logarithmic) or linear sensor output - improves perceived uniformity across ambient light conditions. |
| Internal soft-start | Ramps input current from 0 to 300 mA in 3 ms (typ.) using 10-µH inductor - prevents input rail droop and inrush-induced reset in shared power domains. |
Applications
| Smartphone LCD Backlighting | Personal Navigation Device (PND) Display |
|---|---|
Use Scenario: Adaptive backlight in handheld smartphones under varying ambient light (indoor, outdoor, low-light). IC Role / Device Role / Timing Role: White-LED driver with closed-loop current regulation, ambient light zone detection, and exponential brightness ramping. Use Value: Extends battery runtime by 30–40% versus fixed-brightness operation while maintaining readability across 0.1–10,000 lux conditions. |
Use Scenario: Sunlight-readable TFT display in automotive-grade PNDs with wide temperature (-40°C to 85°C) operation. IC Role / Device Role / Timing Role: High-voltage boost controller delivering stable 36-V output to 10-series LED string with OVP fault protection. Use Value: Ensures consistent luminance despite input voltage sag (e.g., cold-cranking 6 V) and prevents LED overvoltage failure during load dump transients. |
| Tablet PC Content-Adjusted Backlight | Industrial Handheld Terminal Display |
Use Scenario: Dynamic backlight scaling synchronized with video content metadata (e.g., HDR tone mapping). IC Role / Device Role / Timing Role: I²C-programmable current source with 127-step resolution and 1000:1 dimming range. Use Value: Enables local dimming emulation in edge-lit displays, improving contrast ratio by 5× without added cost of full-array LED drivers. |
Use Scenario: Ruggedized field terminal operating in warehouses with rapid ambient light transitions (e.g., doorway entry). IC Role / Device Role / Timing Role: Dual-ALS input processor with configurable averaging time (16–1024 ms) and zone hysteresis. Use Value: Eliminates false-triggering from transient shadows or strobe lighting while responding within 2 seconds to sustained ambient changes. |
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/NOPB | 25-V OVP threshold instead of 40 V; identical pinout, I²C address (0x36), and ALS functionality. | Suitable for lower-output-voltage designs (≤8 LEDs) where 40-V margin is unnecessary and tighter OVP tolerance is preferred. | Select when system output voltage remains below 24 V and higher OVP trip point increases risk of premature shutdown. |
| TPS61165DRVR | Fixed 1.2-MHz switching frequency, no ALS inputs, no I²C interface; uses external PWM or analog dimming only. | Targeted at cost-sensitive, non-adaptive backlighting where ambient sensing is handled externally or omitted. | Choose when ambient adaptation is not required and board space allows larger inductor (due to higher fSW) but BOM cost must be minimized. |
Compared with LM3530UME-25A/NOPB, the LM3530UME-40/NOPB provides greater headroom for LED string voltage growth over lifetime and temperature; versus TPS61165DRVR, it delivers integrated ambient intelligence and digital control at the expense of higher component count and design complexity.
Availability
LM3530UME-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 LM3530UME-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 precision power conversion and sensor interface ICs.
The LM3530UME-40/NOPB belongs to TI's LED backlight driver product line, engineered specifically for adaptive, energy-efficient display illumination in battery-powered portable electronics with stringent size and thermal constraints.
FAQ
What is the I²C address of the LM3530UME-40/NOPB?
The LM3530UME-40/NOPB has a fixed I²C slave address of 0x38. This address is hardwired and cannot be changed via pins or registers. It is compatible with standard-mode (100 kHz) and fast-mode (400 kHz) I²C buses, with timing requirements specified in Section 7.6 of the SNVS606L datasheet. The LM3530UME-40/NOPB uses open-drain SDA/SCL lines requiring external pull-up resistors.
Does the LM3530UME-40/NOPB support both logarithmic and linear brightness control?
Yes, the LM3530UME-40/NOPB supports both modes via the Mapping Mode Select Bit (bit 6 of the BRT register). When set to 0, brightness scales exponentially to match human eye perception; when set to 1, it scales linearly for direct correlation with ALS voltage or external sensor output. This configurability is implemented entirely in hardware and requires no host processor interpolation - the LM3530UME-40/NOPB performs all mapping internally.
How does the dual ALS input function in the LM3530UME-40/NOPB?
The LM3530UME-40/NOPB accepts analog voltage signals on ALS1 and ALS2 pins, each with independently programmable internal pull-down resistors (15 options). The ALS Select bits determine whether the device uses ALS1, ALS2, their average, or the higher of the two as the active input. Zone boundaries (ZB0–ZB3) and targets (Z0T–Z4T) are then applied to that selected signal to drive LED current - enabling robust ambient adaptation even if one sensor fails or is shaded.
What protection features does the LM3530UME-40/NOPB include?
The LM3530UME-40/NOPB integrates overvoltage protection (40 V on OVP pin), thermal shutdown (140°C trip, 125°C hysteresis), current-limit protection (839-mA typical NFET switch limit), and true shutdown isolation. During shutdown (HWEN = low), both LED current sink and ALS inputs are disconnected, reducing total current to ≤2 µA. No external components are needed for these protections - they are fully internal and self-resetting.
Can the LM3530UME-40/NOPB drive more than 11 white LEDs?
No - the LM3530UME-40/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 at 20 mA. Exceeding 11 LEDs risks violating the 40-V OVP threshold under worst-case conditions (high temperature, aged LEDs, high VF), potentially triggering shutdown or damaging the internal switch. For higher LED counts, TI recommends the LM3532 or discrete boost + current-sink solutions.
LM3530UME-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
LM3530UME-40/NOPB FAQ
1.How can I place an order for LM3530UME-40/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3530UME-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 LM3530UME-40/NOPB reliable?
The price and inventory of LM3530UME-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 LM3530UME-40/NOPB is usually 5 days.
3.What payment methods are accepted for LM3530UME-40/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3530UME-40/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3530UME-40/NOPB?
LM3530UME-40/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3530UME-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 LM3530UME-40/NOPB?
For technical support, including LM3530UME-40/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3530UME-40/NOPB requirements.
6.How does Aetrix verify that LM3530UME-40/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3530UME-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 LM3530UME-40/NOPB meets industry standards.
7.What is the process for return or replacement of LM3530UME-40/NOPB?
All LM3530UME-40/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3530UME-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 LM3530UME-40/NOPB part is unused and in its original packaging.
Return procedure for LM3530UME-40/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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