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Texas Instruments LM3530UMX-40B/NOPB
- Part No.:
- LM3530UMX-40B/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-XFBGA, DSBGA
- Datasheet:
-
LM3530UMX-40B/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,202
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Product details
Overview
LM3530UMX-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. Used in smartphone LCD backlighting for adaptive brightness control.
For engineers reviewing the LM3530UMX-40B/NOPB datasheet, LM3530UMX-40B/NOPB pinout, LM3530UMX-40B/NOPB application, or LM3530UMX-40B/NOPB equivalent, key selection criteria include its 1000:1 dimming ratio, dual-programmable ALS voltage setting resistors, true shutdown isolation, 500-kHz fixed-frequency boost architecture, and DSBGA-12 package compatibility with space-constrained portable displays.
Technical Context
The LM3530UMX-40B/NOPB implements a current-mode asynchronous boost converter with regulated current sink (ILED = 0.4 V headroom) and integrated 8-bit ALS zone discriminator. Its I²C interface supports logarithmic or linear brightness control via 127-step BRT codes and 8 full-scale current levels.
It features dual ALS inputs with independently programmable internal pull-down resistors (0.629–1.202 kΩ), selectable averaging time (8 options), and hardware enable (HWEN) with active-high logic. The device uses a fixed 500-kHz switching frequency 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 - powers directly from single-cell Li-ion or USB-supplied systems 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 - digitally adjustable in 127 steps; enables precise luminance tuning for display uniformity. |
| Dimming Ratio | 1000:1 - achieved via I²C-controlled logarithmic brightness mapping, critical for perceptual brightness linearity. |
| Switching Frequency | 500 kHz ±50 kHz - balances efficiency, EMI, and external component size; allows use of compact 10–22 µH inductors. |
| ALS Inputs | ALS1 & ALS2 - dual analog inputs with software-selectable internal pull-downs (15 values) and 5-zone ambient light response. |
| Overvoltage Protection | 40 V threshold - protects output stage during open-circuit LED string faults or transient surges. |
| Quiescent Current | 490–600 µA - ensures minimal battery drain in always-on ambient sensing mode before backlight activation. |
Pinout & Package
LM3530UMX-40B/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 wafer-level chip-scale design targets thin mobile displays where board area and height are constrained.
| 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; timing compliant with standard-mode I²C (max 400 kHz) and fast-mode (1 MHz) per TI spec. |
| A3 SW | Switch node | Connection point for boost inductor and Schottky diode anode; high dv/dt node requiring tight layout to minimize EMI. |
| B1 PWM | External brightness control | Logic-level input enabling simple on/off or PWM-based dimming independent of I²C; supports active-high or active-low polarity. |
| B2 INT | Interrupt output | Open-drain flag signaling ALS zone transition; used to trigger host processor backlight reconfiguration without polling. |
| B3 GND | Power ground | Primary return path for boost switch, current sink, and analog circuitry; must be low-impedance plane under IC. |
| C1 ALS2 | Ambient light sensor input 2 | Analog input with programmable internal pulldown resistor; accepts 0–1 V ALS voltage for zone-based brightness adaptation. |
| C2 HWEN | Hardware enable | Active-high digital enable; pulling low forces true shutdown with <2 µA supply current and isolates ALS inputs. |
| C3 IN | Main power input | 2.7–5.5 V supply input; bypassed with ≥2.2 µF ceramic capacitor placed adjacent to pin for stable boost operation. |
| D1 ALS1 | Ambient light sensor input 1 | Primary ALS input with identical functionality to ALS2; supports independent resistor selection and zone mapping. |
| D2 OVP | Output voltage sense | Feedback node for overvoltage protection; connected directly to cathode of output capacitor to detect >40 V fault condition. |
| D3 ILED | Current sink output | Regulated 0.4 V reference node; connects to LED string cathode; sets LED current via external sense resistor (RSENSE = 0.4 V / ILED). |
Key Features
| Feature | Design Value |
|---|---|
| Dual programmable ALS inputs | Independent 15-value internal pull-down resistor selection per ALS input enables calibration to diverse ambient light sensors (e.g., APDS-9005, TSL2561) without external components. |
| I²C-compatible logarithmic brightness control | 127-step BRT code with exponential mapping matches human eye luminance perception, reducing visible stepping during dimming transitions. |
| True shutdown isolation | HWEN = low disconnects both LED current path and ALS inputs from VDD, achieving <2 µA total shutdown current and eliminating leakage-induced false ALS triggers. |
| Internal soft-start | 3-ms controlled ramp of input current prevents inrush spikes into 2.2-µF input capacitor, avoiding brownout in battery-powered systems during backlight turn-on. |
| 5-zone ambient light response | Programmable zone boundaries (ZB0–ZB3) and target currents (Z0T–Z4T) allow custom backlight curves-e.g., aggressive dimming below 10 lux, flat output above 100 lux-for optimized battery life and readability. |
| Fixed 500-kHz switching | Enables consistent EMI filtering design and predictable inductor sizing; avoids audible noise while maintaining >90% peak efficiency across 2–11 LED loads. |
Applications
| Smartphone LCD Backlighting | Personal Navigation Device (PND) Display |
|---|---|
Use Scenario: Adaptive brightness control in handheld smartphones under varying ambient light (indoor office, outdoor sunlight, nighttime). IC Role / Device Role / Timing Role: White-LED driver with dual ALS inputs and I²C programmability manages backlight intensity in real time based on ambient lux level. Use Value: Extends battery runtime by up to 30% versus fixed-brightness backlight while maintaining visual comfort and display contrast across lighting conditions. | Use Scenario: Outdoor-readable color LCD in automotive-grade PNDs exposed to rapid ambient changes (tunnels, shade-to-sun transitions). IC Role / Device Role / Timing Role: High-efficiency boost driver with 40-V OVP and thermal shutdown ensures reliable operation during extended GPS navigation sessions. Use Value: Prevents LED overvoltage failure during cold-cranking transients and maintains consistent luminance despite wide temperature swings (−40°C to 85°C). |
| Tablet PC Display Power | Portable Medical Monitor Backlight |
Use Scenario: Dual-zone backlight control in 7–10 inch tablets using separate ALS1/ALS2 inputs for front-panel and rear-environment sensing. IC Role / Device Role / Timing Role: Programmable ALS averaging time (1–1024 ms) allows trade-off between responsiveness and noise immunity for smooth brightness transitions. Use Value: Eliminates flicker and step artifacts during ambient transitions, meeting IEC 62368-1 visual ergonomics requirements for consumer tablets. | Use Scenario: Critical-display backlight in portable ultrasound or patient monitors requiring stable, calibrated luminance under clinical lighting. IC Role / Device Role / Timing Role: True shutdown isolation and 0.4 V current-sink headroom ensure precise LED current regulation independent of forward voltage drift. Use Value: Maintains diagnostic image fidelity by preventing luminance drift over time and temperature, supporting FDA Class II device compliance. |
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 | I²C address 0x38 vs. 0x39; identical electrical specs and pinout. | No functional difference; same DSBGA-12 package and ALS/boost architecture. | Select LM3530UME-40 only when I²C bus addressing conflict exists with other devices at 0x39. |
| LM3532UMX-40 | Supports two independent LED strings (dual-channel); adds I²C register bank switching and enhanced ALS averaging. | Required for dual-display or split-backlight architectures; not pin-compatible due to additional control pins. | Choose LM3532UMX-40 when driving separate top/bottom LED strings or needing higher ALS resolution (8 zones). |
Compared with LM3530UME-40, LM3530UMX-40B/NOPB offers identical performance but with unique I²C address 0x39 for multi-device bus configurations; versus LM3532UMX-40, it provides lower cost and smaller footprint for single-string applications where dual-channel capability is unnecessary.
Availability
LM3530UMX-40B/NOPB is available at Aetrix Electronics and suitable for smartphone LCD backlighting, personal navigation device displays, and portable medical monitor backlighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3530UMX-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, serving industrial, automotive, and consumer markets with high-reliability components.
The LM3530UMX-40B/NOPB belongs to TI's LED backlight driver product line, engineered specifically for adaptive, energy-efficient LCD backlight control in space-constrained portable electronics with stringent ambient light response requirements.
FAQ
What is the I²C address of the LM3530UMX-40B/NOPB?
The LM3530UMX-40B/NOPB has a fixed I²C slave address of 0x39 (7-bit), as confirmed in the TI SNVS606L datasheet Table 5. This differs from LM3530UME-40 (0x38) and enables coexistence on the same I²C bus without address conflict. The address is hardwired and not software-configurable. Always verify pull-up resistor values (typically 2.2–4.7 kΩ to VLOGIC) and bus capacitance (<400 pF) for reliable communication with LM3530UMX-40B/NOPB.
How does the LM3530UMX-40B/NOPB implement ambient light sensing with two inputs?
The LM3530UMX-40B/NOPB supports dual ambient light sensing via ALS1 and ALS2 pins, each with independently programmable internal pull-down resistors (15 values). The ALS Configuration Register (bits [6:5]) selects the active input source-ALS1 only, ALS2 only, average of both, or maximum voltage-which determines which signal drives the 5-zone brightness mapping. This allows robust ambient sensing in asymmetric lighting environments, such as side-lit tablets or automotive dashboards, and is fully configurable through LM3530UMX-40B/NOPB's I²C interface without external components.
What is the purpose of the OVP pin on the LM3530UMX-40B/NOPB?
The OVP (Overvoltage Protection) pin on the LM3530UMX-40B/NOPB monitors the boost output voltage and triggers shutdown if it exceeds 40 V, protecting the LED string and internal NFET from damage during open-circuit or overvoltage fault conditions. It must be connected directly to the positive terminal of the output capacitor (COUT) with minimal trace length. The 40-V threshold is fixed and non-adjustable; no external resistor divider is required. This feature ensures safe operation in LM3530UMX-40B/NOPB designs powering up to 11-series white LEDs under worst-case VF and temperature conditions.
Can the LM3530UMX-40B/NOPB drive more than 11 white LEDs?
No, the LM3530UMX-40B/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 (VF ≈ 3.6 V at 20 mA). Driving 12 LEDs would require ≥43.2 V, exceeding the 40-V OVP threshold and risking premature shutdown or reliability degradation. TI's datasheet explicitly limits the device to "2 to 11 series white LEDs." For higher LED counts, consider alternative drivers like the TPS61165 (40-V) or LM3409HV (65-V), as LM3530UMX-40B/NOPB's architecture does not support cascaded or parallel configurations.
Does the LM3530UMX-40B/NOPB support PWM dimming in addition to I²C control?
Yes, the LM3530UMX-40B/NOPB supports external PWM dimming via the dedicated PWM pin (B1), enabling simple brightness adjustment without I²C traffic. When EN_PWM bit = 0 in the Control Register, LED current scales linearly with PWM duty cycle (0–100%). The PWM input accepts logic-level signals (VIH ≥1.26 V, VIL ≤0.54 V) and requires minimum high/low pulse widths of 1.5 ms/1.48 ms respectively. This dual-control capability allows hybrid operation: I²C for coarse setup and PWM for real-time dynamic adjustment, enhancing flexibility in LM3530UMX-40B/NOPB-based display systems.
LM3530UMX-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
LM3530UMX-40B/NOPB FAQ
1.How can I place an order for LM3530UMX-40B/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3530UMX-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 LM3530UMX-40B/NOPB reliable?
The price and inventory of LM3530UMX-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 LM3530UMX-40B/NOPB is usually 5 days.
3.What payment methods are accepted for LM3530UMX-40B/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3530UMX-40B/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3530UMX-40B/NOPB?
LM3530UMX-40B/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3530UMX-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 LM3530UMX-40B/NOPB?
For technical support, including LM3530UMX-40B/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3530UMX-40B/NOPB requirements.
6.How does Aetrix verify that LM3530UMX-40B/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3530UMX-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 LM3530UMX-40B/NOPB meets industry standards.
7.What is the process for return or replacement of LM3530UMX-40B/NOPB?
All LM3530UMX-40B/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3530UMX-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 LM3530UMX-40B/NOPB part is unused and in its original packaging.
Return procedure for LM3530UMX-40B/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3530UMX-40B/NOPB Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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